Added description to binarization and edited Readme

README.md

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-# Digital image processing examples
+# Digital image processing examples
+
+This is a collection of my homework assignments for the digital image processing
+course which I studied in university.

binarization/README.md

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+# Binarization
+
+## Topic
+
+Separation of objects and background in an image with a changing level of light.
+
+## Aim
+
+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
+
+1. Upload an image with rice grains (rice.tif), find
+the optimal threshold for it using the
+[Otsu](https://en.wikipedia.org/wiki/Otsu%27s_method) 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
+2. Convert the original image to binary with this threshold, display it on
+the screen
+3. 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
+4. Display the resulting binary image on the screen, compare the results
+5. Repeat steps 1-4 for the image of a geometric figure on the background
+(figure.png)
+6. 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