# Tag Info

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### $8 \times 8$ block matrix in JPEG image compression?

The lossy JPEG compression does not merely remove small coefficients in higher frequencies. It encodes them with a precision relative to a (relatively crude) visual perception model; most notably, ...
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### What are the cosine functions in JPEG's DCT-II table?

Those 2D cosine functions are independent of your input image. They are just "cosine waves", or the 64 basis functions that yield 64 coefficients when transforming "$8\times 8$" blocks. Given a $D$ \$8\...
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### what is the difference between YUV format and HSV format?

So the best discussion I can point to is in this PDF on Charles Poynton's site. The PDF goes on to much more detailed explanations of each color space, and how to convert between them. It's a bit ...
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### what is the difference between YUV format and HSV format?

YUV is basically a member of the television broadcast industry video/image color encoding formats, and was created during the transition of black & white broadcast into color. A backwards (B&W)...
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### Image compression

Thresholding alone cannot perform data compression. You need to employ some encoding strategy to discard those ignored coefficients, to achive actual bit reduction. For example, in lossy JPEG image ...
• 26.8k