Mouse as a Paint Brush OpenCV provides a facility to use the mouse as a paint brush or a drawing tool. Whenever any mouse event occurs on the window screen, it can draw anything. Mouse events can be left-button down, ...
Contours are defined as a curve joining all the continuous points (along the boundary), having the same color or intensity. In the other, we find counter in a binary image, we focus to find the boundary in the binary image. ...
The basic concept of the threshold is that more simplify the visual data for analysis. When we convert the image into gray-scale, we have to remember that grayscale still has at least 255 values. The threshold is converted everything to ...
Image filtering is the process of modifying an image by changing its shades or color of the pixel. It is also used to increase brightness and contrast. In this tutorial, we will learn about several types of filters. Bilateral Filter ...
Blurring is the commonly used technique for image processing to removing the noise. It is generally used to eliminate the high-frequency content such as noise, edges in the image. The edges are being blurred when we apply blur to the ...
Edge detection is term where identify the boundary of object in image. We will learn about the edge detection using the canny edge detection technique. The syntax is canny edge detection function is given as: Parameters- /path/to/img: file path of ...
Blob stands for Binary Large Object and refers to the connected pixel in the binary image. The term “Large” focuses on the object of a specific size, and that other “small” binary objects are usually noise. There are three processes ...
We can draw the various shapes on an image such as circle, rectangle, ellipse, polylines, convex, etc. It is used when we want to highlight any object in the input image. The OpenCV provides functions for each shape. Here we ...
The image can be rotated in various angles (90,180,270 and 360). OpenCV calculates the affine matrix that performs affine transformation, which means it does not preserve the angle between the lines or distances between the points, although it preserves the ...
Sometimes, it is necessary to transform the loaded image. In the image processing, we need to resize the image to perform the particular operation. Images are generally stored in Numpy ndarray(array). The ndarray.shape is used to obtain the dimension of ...