Noise Estimation / Noise Measurement in Image
- by Drazick
Hello.
I want to estimate the noise in an image.
Let's assume the model of an Image + White Noise.
Now I want to estimate the Noise Variance.
My method is to calculate the Local Variance (3*3 up to 21*21 Blocks) of the image and then find areas where the Local Variance is fairly constant (By calculating the Local Variance of the Local Variance Matrix).
I assume those areas are "Flat" hence the Variance is almost "Pure" noise.
Yet I don't get constant results.
Is there a better way?
Thanks.