ADV212 compress performance with 9x7 wavelet transform

Hi,

When I used ADV212 for compression, I found that the image quality after 9/7 wavelet compression is very poor, so I want to consult: Does ADV212 have this characteristic (the compression effect is much worse than Kakadu software)? Or am I using the parameter configuration incorrectly? With ADV212, how can I further improve the compressed image quality when using 9/7 wavelet transform?


The specific description is as follows:
For a 1024 * 1024 * 12bits image, use Kakadu software and ADV212 to evaluate the compression effect.
Using 9/7 wavelet transform, the test results using Kakadu software are as follows

 

Wavelet

Qstep

Rate(bpp)

Raw image size(KB)

Compressed image size(KB)

Compress ratio

Peak Signal  to Noise Ratio

PSNR(dB)

9/7

0.0002

12

1536

990

1.55

85

9/7

0.0002

6

1536

998

1.54

73

9/7

0.0002

3

1536

676

2.27

56

9/7

0.0002

2

1536

479

3.21

48

9/7

0.0002

1.6

1536

378

4.06

45.9

9/7

0.0002

1

1536

242

6.35

41

 

The test found that when the compression parameter is set to 1.6bpp, the actual compression ratio is about 4, at this time PSNR = 45.9dB, and the compressed image quality meets the requirements.

 

Using 9/7 wavelet transform, test results using ADV212 are as follows:

Wavelet

Qfact

target size

Rcval(Byte)

Raw image size(KB)

Compressed image size(KB)

Compress ratio

Peak Signal  to Noise Ratio

PSNR(dB)

9/7

256/256

40000(hex)

1536

214

7.18

45.56

9/7

256/256

10000(hex)

1536

214

7.18

45.56

 

The test found that the compression ratio does not change with the setting of the Rcval parameter. I understand that as described in the ADV212 JPEG2000 Programming Guide, the ADV212 cannot accurately control the offline of the target size after compression, provided that the image quality is guaranteed. But in reality, the image quality is severely lost.

ADV212 JPEG2000 Programming Guide

 

raw_image

compress_9x7 wavelet with Kakadu software

 

compress_9x7 wavelet with ADV212

 

Test metadata is attached.

 image.zip

With ADV212, how can I further improve the compressed image quality when using 9/7 wavelet transform?

Parents Reply Children