如何计算图像噪声的标准偏差？

Question

I'm currently testing out various denoising algorithms on noisy images. Is there a way of measuring the standard deviation of the noise in the images that I'm denoising (before and after) with OpenCV(python) or any easier method?

Answer 1

I would try to pursue this by taking the image before denoise and applying a bitwise_and to it from the denoised image. This would give you just the noise. Then you could take the standard deviation and compare between the denoising algorithms.