bits/pixel of an image.

[tojeena]

In one paper i read giving values bits/pixel in the range 0.25-2.?what does it mean?will it affect the psnr?psnr is dependent upon B,dynamic range,does bits/pixel(rate) has any relation with dynamic range also?

 

[mgs]

Bits per pixels mensioned as 0.25 - 2.0 means they specified average number of bits per pixels. There are variable length coding methods (like Huffman code, Shanon Fano code) which can assign different number of bits for each gray level according to its probability of occurance.
These specifications are normally for compressed image.Its removing coding redundancy which does not affect PSNR.

 

[tojeena]

Is this similar to that of compression ratio?

Bits per pixels mensioned as 0.25 - 2.0 means they specified average number of bits per pixels. There are variable length coding methods (like Huffman code, Shanon Fano code) which can assign different number of bits for each gray level according to its probability of occurance.
These specifications are normally for compressed image.Its removing coding redundancy which does not affect PSNR.