android - succesive onPreviewFrame byte[] -

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i capturing onpreviewframe in byte[] , saving compare next captured frame. although camera pointed area no change happening , can see on display there no change succesive frames element elemnet different. suggestion why should so? want grayscale , understand first height * width bytes grayscale data, correct>

statistically, there cannot exact match. check out image comparison - fast algorithm way of comparing images.


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