CODEWITHSUNDEEP
image-processingcodecfile-formatimage-compressionjpeg2000
Manish Gautam
Manish Gautam

Reputation: 69

JPEG2000 : Can number of resolution levels be different for different components in a single .jp2 image?

Can number of resolution levels be different for different components in a single jp2 image?

For example,

maxlevel = 5 for component 1
maxlevel = 7 for component 2
mexlevel = 5 for component 3
maxlevel = 5 for component 4

Correct me if any.

Upvotes: 0

Views: 646

Answers (1)

mhernandez
mhernandez

Reputation: 616

Yes, you can specify a different number of wavelet decomposition levels for each component (in fact, for each tile-component). Of course, the number of wavelet decomposition levels is also the number of resolution levels available.

If you are using the Kakadu implementation (www.kakadusoftware.com), the parameters would look something like

Clevels:C0=5 Clevels:C1=7 Clevels:C2=5 Clevels:C3=5

In fact, you can omit everything except Clevels:C1=7, because 5 levels are applied by default.

If you use another JPEG2000 implementation, then you will need to see whether this option is available.

(Edited answering comments): In general, using more than 5 decomposition levels will not give you any extra functionality or coding performance. Roughly explained, the first level divides the image into 4 approximately equal parts. The second level takes the top left quarter and divides it into 4 parts, and so on. Each resolution level besides the original image has the same size as one of this top-left corners, at the first, second or n-th level. Because of this:

  • Adding extra levels will only add very small resolution levels, unless the original image is very large
  • In terms of coding performance, you won't see any noticeable changes unless, again, if the original image is huge.

Upvotes: 2

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