How to compare or find out the P.S.N.R. value of two image.

How to compare or find out the P.S.N.R. value of two image. Is anybody help in finding out the P.S.N.R. value of two color lmage one is original and another is compressed image.after calculating the value how to plot the the graph?

[KALYAN ACHARJYA]

For color image?

Answer 1

[KALYAN ACHARJYA]

For Gray level images, there are inbuilt psnr function there.

For color image you can do the way

PSNR_value=PSNR_rgb(noisyImage,resultantImage);

Here PSNR_rgb is a custom user defined function

You have to save the function PSNR_rgb.m in current Matlab directory and call the function in main script.

Note: I have not verified the function definations, if there are any issues, you can easily do the replication or post the issue in comment section.

Second Question?

after calculating the value how to plot the the graph?

You will get 1 numeric PSNR data, now plotting with respect to whom/How?

Hope it Helps!