dwt, dct watermarking capacity

can any1 tell me how to compute capacity of watermark in dwt and dct domain.

Answer 1

[Walter Roberson]

The capacity of the watermark is the same as the capacity of the image. This could, of course, result in massive changes to the appearance of the image, but change in the appearance of the image has never been prohibited in "watermarking".

[TJ Singh]

but how to evaluate capacity by using dct & dwt ?????

[Walter Roberson]

Multiply the number of array locations of the image by the number of bytes per array location, and then by 8 if you want the capacity in bits.

[Walter Roberson]

Note: the number of bytes per array location is 1 for uint8, 2 for uint16, and 8 for double.

[meziane madani]

the capacity is the size of your image, i mean the number of bits in your watermark