how to calculate threshold value in frame difference algorithm
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Image Analyst 2014 年 8 月 18 日
Subtract the frames. Be sure to cast to double before you do so to avoid clipping values less than zero. You might want to take the absolute value of the difference image. Then pick a threshold however you want. The lower the threshold, the more stuff you will get and the higher the threshold the fewer pixels will be selected. Choose the threshold to get just the pixels you want and no others. Thresholding may not do it - you may have to combine with other methods, like spatial operations that consider neighborhoods around each pixel, or shape, or whatever. It really depends on what you want to find.