Patent ID: 8175411

Claim:
A method for estimating compression noise in an image, said method comprising: receiving an image in a noise-estimation system; determining a first vertical compression-noise estimate associated with no scaling of said image; determining a first horizontal compression-noise estimate associated with no scaling of said image; when said image is scaled in the vertical direction: determining a second vertical compression-noise estimate associated with scaling of said image at a first scaling factor; and setting a third vertical compression-noise estimate to the maximum of said first vertical-compression noise estimate and said second vertical-compression noise estimate; when said image is not scaled in the vertical direction, setting said third vertical compression-noise estimate to said first vertical compression-noise estimate; when said image is scaled in the horizontal direction: determining a second horizontal compression-noise estimate associated with scaling of said image at a second scaling factor; and setting a third horizontal compression-noise estimate to the maximum of said first horizontal-compression noise estimate and said second horizontal-compression noise estimate; when said image is not scaled in the horizontal direction, setting said third horizontal compression-noise estimate to said first horizontal compression-noise estimate; and setting a compression-noise estimate for said image to the maximum of said third vertical compression-noise estimate and said third horizontal compression-noise estimate.