Chromakey-video-to-image

Chromakey-like video cropping without actual green screen. Resulted PNG files will contain alpha channel for transparency.

How to use:

Since there are a lot of different images types that need to be cropped, it would be your job to choose which options give better results. To do so:

1. Run find_best(), set path to your file. It will output 6 pairs of PNG files into find_best folder.
2. Choose best result (for example 00000_HSV_0.png -- this means that HSV color space should be used (mask_as_hsv = True) and mask channel should be 0 (mask_channel = 0))
3. Run chromakey_video2png() with options from step 2. Preferably set frames_max = 10 to proceed only first 10 frames.
4. Modify margin option in range from 10 to 90 to get best results.
5. Modify kernel_ones, dilate and blur options in range from 0 to 5 to get best results.
6. Finally run chromakey_video2png() with frames_max = -1 to process all frames.

Utilises OpenCV and multithreading (multiprocessing) for maximum speed.

Example output:

Based on https://stackoverflow.com/a/66355953