The width and height can also be obtained with the attributes width and height. Well se in this video how to perform a simple shape detection. How to compare histograms of two images using OpenCV Python? PIL.Image object obtained by reading an image with Pillow (PIL) has attributes size, width, and height. To find a Gaussian pyramid, OpenCV provides us two functions cv2.pyrDown () and cv2.pyrUp (). Hi there, Im Anindya Naskar, Data Science Engineer. The shape of an image is accessed by img.shape. In the case you have grayscale image, you will have single value for each row and column. We can recognize any shape of an object by knowing number of endpoints of that object. Flask vs Django: Which One is Easier for Machine Learning? Finally, we have the detect_shapes.py driver script that well use Your email address will not be published. Now that you understand image translation, let's take a look at the Python code. When a face is obtained, we select the face region alone and search for eyes inside it instead of searching the whole image. Image smoothing is an important image processing technique that performs blurring and noise filtering in an image. We will write text at first point. To do that we need to know the point, where we will write the shape name. OpenCV OpenCV PDF97.9 As it can be seen in the above image cropped image color is not the same as the original source cat image color, cropped image is a greyish color whereas in the original image it contains yellow golden color. The following article provides an outline for OpenCV Get Image Size. Almost all the operations in this section are mainly related to Numpy rather than OpenCV. For that, we will create a numpy array with three channels for Red, Green and Blue containing random values. The variable end_points contains all the end points coordinate for 4th contour of our input image , which is a rectangle.So length of that end_points variable must be 4. On the basis of the above result, we conclude that the Shape 1 is more similar to Shape 2 than Shape 3. First one is the window name where the image appears. I highly recommend you get the Computer Vision: Models, Learning, and Inference Bookto learnComputer Vision.How to find shape of image in Python using OpenCVif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'aihints_com-medrectangle-3','ezslot_3',112,'0','0'])};__ez_fad_position('div-gpt-ad-aihints_com-medrectangle-3-0'); If OpenCV is not installed, then first install it using this code. We use cv2.matchShapes() function to match two image shapes. center_coordinates: It is the center coordinates of circle. Save my name, email, and website in this browser for the next time I comment. For BGR image, it returns an array of Blue, Green, Red values. You have covered the entire thing in one article. So RED and BLUE channels will be interchanged). The image size can be obtained as a tuple with the attribute shape Webimread () is one of the most useful and frequently-used methods of the OpenCV-Python library. Better pixel accessing and editing method : Image properties include number of rows, columns, and channels; type of image data; number of pixels; etc. The number of channels in the image is stored at index 2. #using shape() function to get the dimensions of the image This article describes how to get the image size (width, height) in Python with OpenCV and Pillow (PIL). Inside this module we have shapedetector.py which will store our implementation of the ShapeDetector class. When assigning each value to a variable, unpack the tuple as follows. The pixel values of an image are Note that the order of width and height is different. After that, we use the imshow () method. In my last tutorial I have explained this in details. number_of_channels represents the number of channels in the image. To accomplish this, we leveraged: If you have any question or suggestion regarding this post please let me know in the comment section below. For example: In OpenCV we can easily find out number of end points of a detected contour. Not limited to OpenCV, the size of the image represented by ndarray, such as when an image file is read by Pillow and converted to ndarray, is obtained by shape. When unpacking a tuple, values that are not used after that may be assigned to _ by convention. print('The width of the input image is : ', width) import cv2 WebTo read an image in Python using OpenCV, use cv2.imread() function. In this program, we match the shapes in the image. While working with applications of image processing, it is very important to know the dimensions of a given image like the height of the given image, width of the given image and number of channels in the given image, which are generally stored in numpy ndarray and in order to find the dimensions of a given image like the height of the given image, width of the given image and number of channels in the given image, we make use of a function in OpenCV called shape() function and the shape() function returns the dimensions of a given image like the height, width and number of channels in the image. print('The Number of Channels in the input image are : ', channels). It returns a numpy.ndarray (NumPy N-dimensional array) after loading the image successfully. How to perform image transpose using OpenCV Python? A very important application of bitwise AND operation in computer vision or image processing is for creating masks of the image. Required fields are marked *. Morphological Operations Morphological transformations are some simple operations based on the image shape. We then load the image, we get the threshold of the cnt2 The contour points of the second image shape, You can use the following steps to match two image shapes . WhatsApp +1 (248) 730-4177, , , https://www.ekolestnica.ru (, , , , ) , , , , ! print('The Number of Channels in the input image are : ', channels), #importing the module cv2 Wow, this post about shape detection using opencv and python is nice. To draw a circle in Opencv Python. The lower the value, the better matching it is. #reading the image whose dimensions are to be found using imread() function Installing OpenCV from prebuilt binariesBelow Python packages are to be downloaded and installed to their default locations. Install all packages into their default locations. After installation, open Python IDLE. Download latest OpenCV release from GitHub or SourceForge site and double-click to extract it.Goto opencv/build/python/2.7 folder.Copy cv2.pyd to C:/Python27/lib/site-packages.More items How to draw polylines on an image in OpenCV using Python? Grayscale (monochrome) images can be processed in the same way. See the following article on how to get the size of a file in bytes. Image Segmentation using K-means. cv2.putText() This function is used to write text on image. The coordinates are represented as tuples of two values i.e. #importing the module cv2 The ability to add different geometric shapes just like lines, circles and rectangle etc. How to draw geometrical shapes on image using OpenCV Java Library? The image can be either color or grayscale if written as follows. You can do this simply by: Suppose you want to set all the red pixels to zero - you do not need to split the channels first. On execution, the above code will produce the following output . dimensions = imageread.shape In all the following Python examples, the required Python library is OpenCV. In this tutorial I will show you how to detect shape in image using OpenCV. Of course, you can also get them directly by index. print('The dimension of the input image is : ', dimensions) It is normally performed on binary images. Also as example an arrow to indicate something. The width of the image is stored at index 1. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. number_of_channels = input_image.shape[2]. print('The width of the input image is : ', width) Most useful OpenCV functions to know for image analytics, Image to Text using Tesseract OCR with Python, Python | Draw geometric shapes on image using OpenCV. How to perform image rotation in OpenCV using Python? OpenCV. OpenCV is the huge open-source library for the computer vision, machine learning, and image processing and now it plays a major role in real-time operation which is very important in todays systems. By using it, one can process images and videos to identify objects, faces, or even handwriting of a human. #reading the image whose dimensions are to be found using imread() function For drawing a polygon, cv2.polylines() function is used. imageread = cv2.imread('C:/Users/admin/Desktop/Images/car.jpg', cv2.IMREAD_UNCHANGED) This function needs five number of arguments. It returns a tuple of the number of rows, columns, and channels (if the image is color): Total number of pixels is accessed by img.size: Image datatype is obtained by `img.dtype`: Sometimes, you will have to play with certain regions of images. with Python, Pillow, How to use Pillow (PIL: Python Imaging Library), NumPy: Arrange ndarray in tiles with np.tile(), OpenCV: Get image size (width, height) with, Pillow (PIL): Get image size (width, height) with. How to Compute Image Moments in OpenCV Python? The right inner triangle has only 3 sides. We can detect shapes depending on the number of corners it has. We can use the values returned in the given array to calculate the properties like the centroid of a shape. In this tutorial I will use same contour detection technique for shape detection using OpenCV and python. In the same way lets detect shape for all the objects in our input image using a for loop. For drawing a circle, cv2.circle() function is used. kernelfilter. #using shape() function to get the dimensions of the image Erosion and Dilation of images using OpenCV in Python, Addition and Blending of images using OpenCv in Python. You can access a pixel value by its row and column coordinates. How to blend images using image pyramids in OpenCV Python? When a face is obtained, we select the face region alone and search for eyes inside it instead Then we are using the indices 0, 1 and 2 in the shape function to get the height, width and number of channels in the image. #displaying the dimensions of the image as the output on the screen I am using same code (from my last article) to detect and draw contour. You may also have a look at the following articles to learn more . Then we are reading the image whose dimensions are to be detected using the imread() function. So use it only if necessary. For drawing an ellipse, cv2.ellipse() function is used. Tutorials. #reading the image whose dimensions are to be found using imread() function You can read image as a grey scale, color image or image with transparency. Greate post shape detection OpenCV Python. PandasOpenCVSeabornNumPyMatplotlibPillow PythonPlotly Python. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy, Explore 1000+ varieties of Mock tests View more, Special Offer - OpenCV Training (1 Course, 4 Projects) Learn More, 600+ Online Courses | 50+ projects | 3000+ Hours | Verifiable Certificates | Lifetime Access, Python Certifications Training Program (40 Courses, 13+ Projects), Java Training (41 Courses, 29 Projects, 4 Quizzes), Programming Languages Training (41 Courses, 13+ Projects, 4 Quizzes), Software Development Course - All in One Bundle. Your email address will not be published. We will use the following image and the Input File in this program , And we get the following window, showing the output . print('The height of the input image is : ', height) To detect object using contour to need to do some modification to your image. Agree Output: 1107 height, 1280 width, and the number of channels is 3 (Red, Green, Blue). import cv2 dimensions = imageread.shape if img.ndim == 2: #2 The function cv2.pyrDown () decreases the resolution by removing the cv2.rectangle() This function is used to draw rectangle on an image. Print the result value, the image shape matching metric. geometric shapes. The alogrithm is also known as Ramer Douglas Peucker alogrithm. In OpenCV it is implemented in cv2.approxPolyDP method.abs. detectShape () function below takes a contour as parameter and. then returns its shape. '''. Your email address will not be published. We also match the shape with itself from each image. Often working with image analysis, we want to highlight a portion of the image, for example by adding a rectangle that defines that portion. and the position. By using this website, you agree with our Cookies Policy. 5.2 ii) Preprocessing the Image. This function returns a metric showing the similarity between the image shapes. width represents the width of the input image. height = imageread.shape[0] C# Programming, Conditional Constructs, Loops, Arrays, OOPS Concept, This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. To write text with OpenCV there is cv2.putText() function that accepts a number of arguments. See the following article for image resizing. Here we discuss the introduction, working of shape() function in OpenCV and examples, respectively. WebPost the code you are using for shape identification. Required fields are marked *. Performing white BlackHat operation on images using OpenCV; Draw a line on an image using OpenCV; Draw an ellipse on an image using OpenCV; Reading an image using Now lets write text on top of each shape. height = input_image.shape[0] Each image contains a single shape. In this tutorial I will show you how to detect shape in image using OpenCV. In this program, we match two image shapes. Numpy is an optimized library for fast array calculations. print('The dimension of the input image is : ', dimensions) But it has more applications for convolution operation, zero padding etc. The dimensions of a given image like the height of the image, width of the image and number of channels in the image are called the shape of the image. In OpenCV, there are two built-in functions for performing transformations: cv2.warpPerspective: takes How to access image properties in OpenCV using Python? #displaying the dimensions of the image as the output on the screen In this example, we will write a numpy array as image using cv2.imwrite () function. The shape() function stores each of the dimension of the image like the height of the image, width of the image and number of channels in the image at different indices. Lower the metric value, higher the similarity between the image shapes. If you want to assign width and height to variables, you can apply the following to either color or grayscale images: If you want to get a (width, height) tuple, you can use slice. The function cv2.pyrDown () decreases the resolution by removing the consecutive rows and columns in the input image. This function takes five arguments. For drawing a rectangle cv2.rectangle() function is used. Learn more. 4 Image Segmentation in OpenCV Python. channels = imageread.shape[2] Do you really need to process the inner contour? The kernel average of neighborhoods We can also use the operator to add watermarks to an image. This function uses Hu-Moments to calculate the metric value. To find a Gaussian pyramid, OpenCV provides us two functions cv2.pyrDown () and cv2.pyrUp (). Select the particular contour from each image and apply the shape match function cv2.matchShapes() passing the selected contours. 0 . If you print end_point variable you will have four points (for rectangle). Find and Draw Contours with OpenCV in Python, 7 Best Text to Image AI Image Generators Free tool, Beginners Guide to LiDAR: Light Detection and Ranging, Emotion Recognition from Facial Expressions in Python. Here is the full code for detecting lines in your live camera: import numpy as np import matplotlib.pyplot as plt import cv2 cap = cv2.VideoCapture(0) while True: _, image = This article describes how to get the image size (width, height) in Python with OpenCV and Pillow (PIL). The image size can be obtained as a tuple with the attribute shape of ndarray in OpenCV and the attribute size of PIL.Image in Pillow (PIL). cv2.line() This function is used to draw line on an image. nparrayshape. Consider the below images as the input images mentioned as 'star.png' and 'pentagon.png' in the above program. 2022 - EDUCBA. #using the indices 0, 1 and 2 in shape function to get the height, width and number of channels in the image For now I am only drawing 4th contour which is a Rectangle. You have explained all kind of shape detection technique in this post, Can it be applied to video? Shape detection using OpenCV and Python. It finds applications in preprocessing and postprocessing of deep learning models. Zero Padding. This method takes two arguments. #using the indices 0, 1 and 2 in shape function to get the height, width and number of channels in the image cnt1 The contour points of the first image shape. This function accepts eight input parameters. When an image file is read by OpenCV, it is treated as NumPy array ndarray. How to perform image translation using OpenCV in Python? We have detected Rectangle in image with OpenCV and python. imageread = cv2.imread('C:/Users/admin/Desktop/Images/educba.jpg', cv2.IMREAD_UNCHANGED) The dimensions of a given image like the height of the image, width of the image and number of channels in the image are called the shape of the image. width = input_image.shape[1] To Find any shape in image we will follow below steps: In this post I will use same image which I have used in my last post (Object detection using contour). Then we are using the shape() function to get the dimensions of the image. I suspect you are counting contour sides, and in the left image there's a small (upper) side in the inner triangle, possibly making the In other cases, you may need to join these individual channels to create a BGR image. Make sure you have already installed it. How to draw geometrical shapes on image using OpenCV Java Library? $ sudo apt-get install libopencv-dev python-opencv. Numpy indexing is faster: cv.split() is a costly operation (in terms of time). In the above program, the required module cv2 is imported. We make use of First and third party cookies to improve our user experience. 5 1. print('The height of the input image is : ', height) This In the case of a color image, it is a 3D ndarray of row (height) x column (width) x color (3). Post the code you are using for shape identification. An example where the number of colors (number of channels) is not used is as follows. In general, smoothing is performed by a 2D kernel of a specific size on each channel of the image. Read the input images as grayscale images using cv2.imread(). ROI is again obtained using Numpy indexing. channels = imageread.shape[2] WebIn Python, we can use the image moments using the moments () function from the opencv library. cv2.imread () method loads an image from the specified file. print('The Number of Channels in the input image are : ', channels). You can find the shape of an image in Python using OpenCV by following the given steps. Import the required library. height represents the height of the input image. In my last post I have shown, how you can detect object using contour detection technique. nparrayshape. When setting the size to cv2.resize(), etc., it needs to be (width, height). imread() returns a numpy array containing values that represents pixel level data. In this case, you need to split the BGR image into single channels. OpenCV Python How to add borders to an image. cv2.ellipse() This function is used to draw ellipse on image. How to resize an image in OpenCV using Python? Maybe you can process the external contour only. Apply thresholding on the grayscale images to create binary images. You can find the shape of an image in Python using OpenCV by following the given steps. Affordable solution to train a team and make them project ready. #displaying the dimensions of the image as the output on the screen #importing the module cv2 Tutorial Neural Style Transfer using Tensorflow, 1 Tips to Help You Improve Your Programming Skills Quickly, Shape recognition of any object in the image, Recognize shape of any object by end points of contour, Find End Points of a contour using Contour Approximation, Decide type of shape using number of end points of any detected contour, Write shape name of a contour on top of shape. Loads an input image, an image patch ( template ), and optionally a maskPerform a template matching procedure by using the OpenCV function matchTemplate () with any of the 6 matching methods described before. Normalize the output of the matching procedureLocalize the location with higher matching probabilityMore items print('The dimension of the input image is : ', dimensions) The width and height of the output image become half the input image decreasing the area to one-fourth. If you want to create a border around an image, something like a photo frame, you can use cv.copyMakeBorder(). In the following examples, we will match the shapes from different images and also shapes from a single image. We make use of First and third party cookies to improve our user experience. How to normalize an image in OpenCV Python? For grayscale (monochrome) images, it is a 2D ndarray of rows (height) x columns (width). Stroke color in BGR (not RGB, to be noted), Coordinates of the vertex at the top left (x, y), Coordinates of the lower right vertex (x, y), Length of the minor and major axes (h, w), Rotation angle of the ellipse (calculated counterclockwise), Stroke color in BGR (not RGB to be noted). The shape of the image is stored in numpy.ndarray. In order to find the shape of a given image, we make use of a function in OpenCV called shape() function. 15 , , Your email address will not be published. Affordable solution to train a team and make them project ready. Arithmetic Operations on Images using OpenCV in Python, Python Grayscaling of Images using OpenCV, Histograms Equalization using Python OpenCv Module, Reading an image using Python OpenCv module, Performing white TopHat operation on images using OpenCV, Performing white BlackHat operation on images using OpenCV. I was able to achieve this but the cropped image is in gray color instead of color as in the original image. channels = imageread.shape[2] print('The height of the input image is : ', height) A good knowledge of Numpy is required to write better optimized code with OpenCV. Thanks for the complete tutorial about shape detection using opencv and python, Best tutorial for shape detection opencv python, 30 . print('The width of the input image is : ', width) Then we read the image using OpenCVs imread () method. OpenCV OpenCV PDF97.9 MB8.4. This function takes following arguments: Below is a sample code demonstrating all these border types for better understanding: See the result below. For eye detection in images, first face detection is done over the entire image. Learn more, # Apply thresholding on the images to convert to binary images. Here, the path is Images/audi-640.jpg. The height of the image is stored at the index 0. You can modify the pixel values the same way. Then we are displaying the dimensions of the image as the output on the screen. width = imageread.shape[1] dimensions = imageread.shape For example, a triangle has 3 corners, a square has 4 corners, and a pentagon has 5 corners. If the image cannot be read (because of the missing file, improper permissions, unsupported or invalid format) then We can find shapes present in an image using the findContours () and approxPolyDP () function of OpenCV. imageread = cv2.imread('C:/Users/admin/Desktop/Images/logo.png', cv2.IMREAD_UNCHANGED) width = imageread.shape[1] I created this website to show you what I believe is the best possible way to get your start in the field of Data Science. Let's have a look at some examples for a better understanding. Otherwise go for Numpy indexing. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. How to Install OpenCV in Python using Anaconda Prompt, How to Read and Show Image in Python using CV2 (OpenCV), How to Resize Image in Python using OpenCV (CV2), How to Convert Color Image in Grayscale using OpenCV Python, How to Convert JPG Image into PNG using OpenCV Python, How to Draw Filled Rectangle in OpenCV Python, How to Draw Filled Circle in OpenCV Python, How to Draw Rotated Rectangle in OpenCV Python, How to Draw Bounding Box in OpenCV Python, How to convert image into black and white in OpenCV Python, How to Read and Show Video in Python using CV2 (OpenCV), How to convert RGB to HSV in OpenCV Python, How to convert BGR to RGB in OpenCV Python, How to convert BGR to LAB in OpenCV Python, How to convert RGB to CMYK using OpenCV and NumPy, How to do Euclidean Transformation in OpenCV Python, How to do Similarity Transformation in OpenCV Python, How to do Affine Transform in OpenCV Python, How to do Perspective Transformation in OpenCV Python, How to Rotate an Image by an angle in OpenCV Python, How to Translate an Image in OpenCV Python, How to convert PNG to JPG in Python using OpenCV, How to convert jpg to jpeg in Python using OpenCV, How to convert image to NumPy array in Python, How to Convert Color Video into Grayscale using OpenCV in Python, How to Convert Video into Black and White using OpenCV Python, How to find size of image in Python using OpenCV, How to find number of contours in OpenCV Python, Split Image into channels using OpenCV in Python, How to create a water effect in Python OpenCV, Image addition in Image Processing using OpenCV, Image Multiplication in Image Processing using OpenCV, How to convert grayscale image to binary image in OpenCV, Computer Vision: Models, Learning, and Inference Book. (X coordinate value, Y coordinate value). It is used to load an image in the Python program from the specified file. ALL RIGHTS RESERVED. I highly recommend you get the Computer Vision: Models, Learning, and Inference Book to shape is a tuple of (row (height), column (width)). See the following article for details of slicing. pythonnparrayimg.channels (). The size (width, height) of the image can be obtained from the attribute shape. Webpythonnparrayimg.channels (). THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS. This function accepts five input parameters. Reading an image in OpenCV using Python; OpenCV | Saving an Image; Arithmetic Operations on Images using OpenCV | Set-1 (Addition and Subtraction) Arithmetic shape is a tuple of (row (height), column (width), color (3)). This is a guide to OpenCV Get Image Size. How to find shape of image in Python using OpenCV. Two basic morphological operators are 5.1 i) Importing libraries and Images. *( Examples will be shown in a Python terminal, since most of them are just single lines of code )*. How to detect humans in an image in OpenCV Python? In this article, we have seen the concept of shape() function in OpenCV to find an images size with corresponding programming examples and their outputs to demonstrate them. For drawing a line cv2.line() function is used. At this point you know how to detect shape or recognize shape using contour end points. I suspect you are counting contour sides, and in the left image there's a small (upper) side in the inner triangle, possibly making the shape 4-sided. WebExample 2: Save Image using cv2 imwrite () with Random Values. Agree Those are coordinates (x, y) of each points of the rectangle. Simple shape detection Opencv with Python 3. by Sergio Canu . Syntax to define shape() function in OpenCV: Start Your Free Software Development Course, Web development, programming languages, Software testing & others, dimensions = input_image.shape In this post, I have explained how to perform shape detection with OpenCV and Python. . If you want to get tuples in the order of (width, height), you can use slice like the following example. input_image represents the image whose dimensions are to be found. To check if your installation was successful or not, run the following command in either a Python shell or your command prompt: # Extract image dimensions row, col = img_gs.shape # Declare salt & pepper noise ratio s_vs_p = 0.5 output = np.copy(img_gs) # Apply salt noise on Save my name, email, and website in this browser for the next time I comment. width = imageread.shape[1] OpenCV Python Get Image Size In Image Processing applications, it is often necessary to know the size of an image that is loaded or transformed through various stages. First of all, we import cv2. You can look on image (I) in python/numpy as a matrix with N dimensions. The basic operations of OpenCV is to draw over images. How to detect polygons in image using OpenCV Python? import cv2 Get the size of a file and directory in Python, How to slice a list, string, tuple in Python, Binarize image with Python, NumPy, OpenCV, Detect and read barcodes and QR codes with ZBar in Python, Alpha blending and masking of images with Python, OpenCV, NumPy, Generate gradient image with Python, NumPy, Get the image from the clipboard with Python, Pillow, Convert BGR and RGB with Python, OpenCV (cvtColor), Generate QR code image with Python, Pillow, qrcode, How to create animated GIF with Pillow in Python, Draw circle, rectangle, line, etc. dimensions represent the dimensions of the image. Given below are the examples of OpenCV Get Image Size: OpenCV program in python determines the dimension of a given image and displays the height, width, and number of channels in the given image as the output on the screen. To find the number of corners of a shape, we must first find the For eye detection in images, first face detection is done over the entire image. We use the following syntax to match two image shapes . Here I am selecting the ball and copying it to another region in the image: Sometimes you will need to work separately on the B,G,R channels of an image. In this 5.3 iii) Defining #using shape() function to get the dimensions of the image This function returns a metric showing the similarity between the The moments up to the third order of a polygon are calculated using this function, and it returns the moments in an array. For grayscale image, just corresponding intensity is returned. In my last post I have shown, how you can detect object using Syntax: cv2.circle(image, center_coordinates, radius, color, thickness) Parameters: image: It is the image on which line is to be drawn. #using the indices 0, 1 and 2 in shape function to get the height, width and number of channels in the image Python - OpenCV & PyQT5 together. height = imageread.shape[0] The functions are listed below: cv2.line: This function is used to draw a straight lineon the image which starts at a specified (x, y) pair of coordinates and end at another (x, y) pair of By using this website, you agree with our Cookies Policy. The shape() function can provide the dimension of a given image. height = imageread.shape[0] Starting from an image with a few shapes, well be able to detect exactly each shape (rectangle, circle, pentagon, etc.) If you already read my last tutorial you will know how to detect contours. By signing up, you agree to our Terms of Use and Privacy Policy. This function accepts five input parameters. Find the contours of the shapes in the binary images using cv2.findContours() function. It improves accuracy (because eyes are always on faces :D ) and performance (because we search in a small area). This method takes the image path as an argument. We use cv2.matchShapes () function to match two image shapes. (Image is displayed with matplotlib. So simply accessing each and every pixel value and modifying it will be very slow and it is discouraged. It needs two inputs, one is our original image, the second one is called structuring element or kernel which decides the nature of the operation. cv2.circle() This function is used to draw circle on an image. 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