PNSR formula psnr=20.0* (log10(255/sqrt(mse)));

Can we type the formula like this: psnr=20.0* (log10(1/sqrt(mse)));

I mean can we write 1 intstead of 255.

Plz explain.

Answer 1

[Murugan C]

Hi Faizullah

We can use 1 instead of 255, if your input image is logical (max pixel range is 1 ) or your image is uint8 then you should use maximum of image pixel range is 255.

Refer-PNSR Link

[Faizullah khan]

Thank you Sir my input image is Lena.tif and I want to calculate psnr by using weighted median filter.When I am using 255 in psnr formula it give me very high value.But when I use 1 in psnr formula it give me normal value. So I think 1 will be OK.Comment plz..

[Faizullah khan]

Plz Explain that for weighted median filter 1 will be ok or 255?. Image is lena.tif.

Thanks & Regards

[Murugan C]

Hi,

PSNR shoud be more than 100. Please find max value from your output image and use it as below

psnr= 10.0* (log10((max(max(output_img))/sqrt(mse)));