SYSTEM AND METHOD FOR SHARPENING VECTOR-VALUED DIGITAL IMAGES

摘要

Sharpening multi-spectral digital images without increasing noise is accomplished by filtering vector values rather than independent scalar values. A low-pass filter is performed on image A to obtain a blurred image B1 with noise and signal suppressed. The resulting blurred image B1 is subtracted from the original image A to produce a high frequency band C1 that contains noise and signal. Vector difference mean filtering is performed on the original image A to produce a filtered image B2 with noise suppressed. The filtered image B2 is subtracted from the original image A to produce a noise band C2 that contains noise with very little signal. The noise band C2 is subtracted from the high frequency band C1 to produce a signal band D that contains the signal. The signal band D is then added to the filtered image B2 to further enhance detail in the noise filtered band.