can every one help me to give me a functions for calculate the quality of image?

hello I work in the project for image quality is there any one can help me to give me a functions to find the quality of image in matlab thanks

Answer 1

[Walter Roberson]

If you only have one image, then its quality is always "perfect". Image quality is always measured between two images.

http://www.mathworks.com/help/images/image-quality-metrics.html

[Maryem Munm]

Thank you very much I have two image

[Image Analyst]

ssim, like shown in Walter's link, is very popular among imaging people. It's better than PSNR though some people still use psnr, possibly because they don't know about better, more modern methods. Another good reference that discusses additional methods is https://en.wikipedia.org/wiki/Image_quality