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Why imwrite compressed same size mat with different entropy to the same size (16bits)

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TIAN FENG 2016 年 1 月 29 日
閉鎖済み: MATLAB Answer Bot 2021 年 8 月 20 日
For example there are two matrix which are the same size, but one are all zeros another isn't, when i try to compress them use imwrite with jp2, the result file size are the same. some times The mattrix are 16bit int.
  1 件のコメント
Walter Roberson
Walter Roberson 2016 年 1 月 29 日
"An interesting point to make about the very high experimental compression rates of 25:1 and above, was that output file sizes were essentially homogeneous across all the images, where as at 10:1 and lower, file sizes ranged from 1.5 Mb to 11.5 Mb."
What compression ratio were you requesting?

回答 (1 件)

Vidya Viswanathan
Vidya Viswanathan 2016 年 2 月 5 日
I was unable to reproduce the behavior you described. I used the following code snippet to generate two images and save it in "jp2" format.
I=zeros([640 480]);
I2=rand([640 480]);
This uses a default compression ratio of 1. The resultant images had significantly different sizes. The first one was just 1KB whereas "fig2" was of size 326 KB. Hence, I believe that this behavior is not consistent. Could you share the data for which you are observing this behavior?

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