My DCT image is showing a zero matrix. Why is it so?

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Chandvi Arora
Chandvi Arora 2017 年 7 月 18 日
コメント済み: Walter Roberson 2017 年 7 月 18 日
I converted YUV image to gray and then found its DCT and IDCT. The resulting image(IDCT one) is showing a zero matrix when I view it through imread command. I can't understand the reason behind it. And secondly, how to reduce the no. of elements of a matrix? For example say, I want to reduce my matrix form 10*10 to 8*8 one?

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Walter Roberson
Walter Roberson 2017 年 7 月 18 日
You forgot to uint8() the result of the idct before using imwrite()
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Chandvi Arora
Chandvi Arora 2017 年 7 月 18 日
Can you please provide a demo code to explain this further?
Walter Roberson
Walter Roberson 2017 年 7 月 18 日
Suppose that you have named the result of the idct to be Result. Then between the idct and the imwrite add
Result = uint8( Result) ;
After that proceed to imwrite

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