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A histogram is a graphical representation showing how the pixel intensities (ranging from 0 to 255) are distributed in an image. For a digital image histogram plots a graph between pixel intensity versus the number of pixels. The x-axis has intensity variations, and the y-axis indicates the number of pixels in that particular intensity. We can see the images and its histograms. By simply looking at the histogram of an image, we can get basic idea about contrast, brightness, intensity distribution etc of that image. In this article, we will write a python program using the OpenCV module ... Read More
An image with reversed brightness is referred a negative image, in which the light parts of the image appear dark and the darker parts appear lighter. The negative transformation of a colored image (RGB image) will be reversed, with red areas appearing cyan, greens appearing magenta, and blues appearing yellow. In Medical Imaging, Remote Sensing, and some other applications negative transformation is widely used. It also helps to find the details from the darker regions of the image. The negative transformation function is − As we know that an 8-bit image has a max intensity value is 255, therefore ... Read More
OpenCV is an Open Source Computer Vision Library in python. It provides numerous functions to perform various Image and video processing operations. The library uses the Numpy module to represent all the video frames and images as a ndarray type. It needs the numpy library, we need to make sure that the numpy module is also installed in our python interpreter. In this article, we will see different ways to get the duration of a video using the python OpenCV module. The OpenCV provides a VideoCapture.get() method to get the specified property of a video by passing one of the ... Read More
The centroid is also called the geometric center; it is defined as the center point of the object. Whereas the centroid of a triangle is defined as the point of intersection of all three medians of a triangle. Calculating the Centroid of a triangle: Let’s consider an ABC triangle, the three vertices of the triangle are A(x1, y1), B(x2, y2), and C(x3, y3). Then the centroid of a triangle can be calculated by taking the average of the x and y coordinates of all three vertices. centroid of a triangle = ((x1+x2+x3)/3 , (y1+y2+y3)/3 ) In ... Read More
OpenCV is an Open Source Computer Vision Library in python. It provides numerous functions to perform various Image and video processing operations. The library uses the Numpy module to represent all the video frames and images as a ndarray type. It needs the numpy library, we need to make sure that the numpy module is also installed in our python interpreter. In this article, we will see different ways to draw a cross on an image using OpenCV Python. Let’s observe the input-output scenario to understand how to draw a cross on an image. Input Output Scenarios Assuming we have ... Read More
OpenCV is an Open Source Computer Vision Library in python. It provides numerous functions to perform various Image and video processing operations. The library uses the Numpy module to represent all the video frames and images as a ndarray type. It needs the numpy library, we need to make sure that the numpy module is also installed in our python interpreter. In this article, we will see different ways to draw multiple rectangles in an image using OpenCV Python. To draw the rectangular shape on an image, Python OpenCV module provides a method called cv2.rectangle(). The cv2.rectangle() function The ... Read More
In digital images, Transparency is the functionality that supports transparent areas in an image or image layer. For image processing/image editing, background removing is allowing us to highlight the subject of the photo and create a transparent background to place the subject into various new designs and destinations. Certain image formats do not support transparency, for example, TIFF, PNG, and WebP graphics formats support transparency, whereas JPEGs have none. In this article, we will see how to remove the black background from an image to make it transparent using OpenCV Python. Like RGB channels, the alpha channel is used to ... Read More
OpenCV is an Open Source Computer Vision Library in python. It provides numerous functions to perform various Image and video processing operations. The library uses the Numpy module to represent all the video frames and images as a ndarray type. It needs the numpy library, we need to make sure that the numpy module is also installed in our python interpreter. In this article, we will see different ways to draw rectangular shapes and extract the object using python OpenCV. Drawing a Rectangle To draw the rectangular shape on an image, Python OpenCV module provides a method called cv2.rectangle(). This ... Read More
OpenCV is an Open Source Computer Vision Library in python. It provides numerous functions to perform various Image and video processing operations. The library uses the python Numpy module to represent all the video or image arrays as a ndarray type. It needs the numpy library, we need to make sure that the numpy module is also installed in our python interpreter. Displaying date and time in videos using OpenCV In live streaming/video processing applications sometimes we need to display the date and time on videos. To achieve this, we can use the python datetime module. The python datetime ... Read More
OpenCV is an Open Source Computer Vision Library in python. It provides numerous functions to perform various Image or video processing operations. The library uses the python Numpy module to represent all the video or image arrays as a ndarray type. In this article, we will see click responses on video output using events in the python OpenCV module. To identify which mouse event occurred on the video output. Here we will use the below mouse event − cv2.EVENT_LBUTTONDOWN: indicates the left button is pressed cv2.EVENT_RBUTTONDOWN: indicates the right button is pressed Also, we will use ... Read More