Opencv compare two images

1. How do I compare two images in OpenCV?
2. How to compare two images in image processing?
3. How do I know if two pictures are similar?

How do I compare two images in OpenCV?

To compare two images, we use the Mean Square Error (MSE) of the pixel values of the two images. Similar images will have less mean square error value. Using this method, we can compare two images having the same height, width and number of channels.

How to compare two images in image processing?

The general idea is very simple - pixel-by-pixel comparison. The comparison engine gets the color of pixels that have the same coordinates within the image and compares this color. If the color of each pixel of both images coincides, TestComplete considers the two images to be identical.

How do I know if two pictures are similar?

The similarity of the two images is detected using the package “imagehash”. If two images are identical or almost identical, the imagehash difference will be 0. Two images are more similar if the imagehash difference is closer to 0.