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| Video Functions

## We develop some functions to finish the whole process of video processing, from opening an AVI file to writing the processed result to an AVI file.

> 1. OpenAviFile
> ！！ open an AVI file with uncompressed video stream and get the information
> 2. AviReadFrame
> ！！ read the specific frame from the video stream
> 3. AviReadEnd
> ！！ end the reading for the specific AVI file
> 4. CreateAviFile
> ！！ create an AVI file
> 5. AviWriteFrame
> ！！ write one image into the specific AVI file
> 6. AviWriteEnd
> ！！ end the writing for the specific video file
> 7. OnSubtract
> ！！ thresholding the subtraction of two images
> 8. framesub
> ！！ add a new frame for temporal differencing
> 9. forframe
> ！！ insert a new frame to the frame list and choose the previous frame
> 10. detect_mov_region
> ！！ remove those still regions from the regionlink according to the result of the
> modified temporal differencing

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