Implement an algorithm for block binarization of an image with the choice of a separate threshold for each block, evaluate the operation of the algorithm on images with varying light levels.

Instructions

Upload an image with rice grains (rice.tif), find the optimal threshold for it using the Otsu method, which will separate the images of rice grains from the background, build a histogram of the image and mark the threshold found on it
Convert the original image to binary with this threshold, display it on the screen
Split the original image into 100 blocks (10 vertically, 10 horizontally), find the optimal threshold for each block using the Otsu method, block by block convert the image to binary, applying its own threshold for each block
Display the resulting binary image on the screen, compare the results
Repeat steps 1-4 for the image of a geometric figure on the background (figure.png)
Make a conclusion about the effect of changes in the illumination level on the result of selecting objects against the background during binarization with a global threshold, as well as about the possibilities of the block binarization method for solving a similar problem, if necessary, provide histograms for individual image blocks