I'm working on pre-processing image compression session. I'm researching on image compression methods and read lot of articles about jpeg2000 image compression. But I can't find clear resource about choosing bitrate for different layer of color image and bitrate calculation methods in jpeg2000. Please give me some clues with official references on that.
Bit-rate calculation in Jpeg2000 image compression
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There is not a single correct answer. The number of layers and the bit rates associated with those layers should be set according to the needs of the users and systems which will consume the imagery.
The good news is that there is plenty of guidance! Here are two options.
Copy Kakadu
Take a look at this gist. It shows the input parameters for Kakadu's
kdu_compressutility. For the-rateflag it states:Kakadu is heavily used in industry and their J2K compression software is highly trusted. So if they software uses logarithmic spacing for their quality layers that might be a reasonable place to start.
Pick a profile in the BIIF Profile for JPEG 2000
On the other hand, you can take a look at the BIIF Profile for JPEG 2000 which provides several compression profiles for different situations. The profiles provides examples giving the number of layers and bit rates. That said, there is a general message across all the profiles such as:
D.4.7 (NPJE profile) of BIIF:
F.7 (TPJE profile) of BIIF:
G.2.1.2 (LPJE profile) of BIIF: