Why Using Zig-Zag pattern in JPEG compression

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Question by Sulficker
Submitted on 4/16/2004
Related FAQ: JPEG image compression FAQ, part 1/2
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Why Using Zig-Zag pattern in JPEG compression

Answer by Mark
Submitted on 10/18/2004
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The spectrum of frequencies falls off with increasing frequency. To make the runlength encoding efficient, the highest frequencies should be visited last, since there will be a lot of zeros there. The zigzag pattern basically goes through the 2D frequency space from low (starting at 0,0 aka DC) to high.

Answer by Prithvi
Submitted on 3/30/2005
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After we quantize the DCT coefficients,we have lots of zeroes in the matrix.If we use zigzag pattern now,we can have a continous run of zeroes which is capitalized by the Run-Length Encoding. comments:prithviadhi@yahoo.com

Answer by sam
Submitted on 8/4/2005
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by doing zig-zag scanning all successive zeros (high freq) comes together , which further easy to apply run length coding , where here by doing this , the co-efficients are arranged in low frequency , mid and high -freq

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