Multiresolution unsharp image processing apparatus

Claim 2

An image-processing apparatus, in which a high-frequency component signal of an original image-signal, representing a plurality of pixels, is added to either said original image-signal or a lowest frequency image-signal of said original image-signal, in order to generate a processed image-signal, comprising: a conversion-processing section to apply a conversion-processing to unsharp image-signals, generated from said original image-signal in respect to a plurality of frequency bands, so as to generate converted unsharp image-signals; a differential processing section to generate differential image-signals, obtained from differences between said unsharp image-signals and said converted unsharp image-signals; and an addition-processing section to totally add said differential image-signals to generate said high-frequency component signal of said original image-signal.

Claim 3

The image-processing apparatus of claim 1 , wherein said conversion-processing is to convert pixel values of said unsharp image-signals, based on a non-linear transform.

Claim 4

The image-processing apparatus of claim 1 , wherein said conversion-processing is determined by said original image-signal or said unsharp image-signals in said plurality of frequency-bands.

Claim 5

The image-processing apparatus of claim 1 , wherein said conversion-processing is determined by said original image-signal or said unsharp image-signals in adjacent pairs of frequency-bands.

Claim 6

The image-processing apparatus of claim 1 , wherein said conversion-processing varies depending on either one of pixel value of said unsharp image-signals employed for generating said differential image-signals or pixel values of said original image-signal.

Claim 7

The image-processing apparatus of claim 1 , wherein said conversion-processing varies depending on said unsharp image-signals.

Claim 8

The image-processing apparatus of claim 1 , wherein said conversion-processing is a suppression-processing for suppressing an averaging-processing for averaging image-signals.

Claim 9

The image-processing apparatus of claim 7 , wherein the lower a frequency-band in which said unsharp image-signals reside is, the greater a degree of suppressing said averaging-action for averaging said image-signals in said suppression-processing is.

Claim 10

The image-processing apparatus of claim 7 , wherein the higher a frequency-band in which said unsharp image-signals reside is, the stronger a power of suppressing said averaging-action for averaging said image-signals in said suppression-processing is.

Claim 11

The image-processing apparatus of claim 1 , wherein said conversion-processing varies depending on pixel values of said unsharp image-signals to be processed by said conversion-processing.

Claim 12

The image-processing apparatus of claim 1 , wherein said conversion-processing varies depending on pixel values of an unsharp image-signal at a lowest frequency-band.

Claim 13

The image-processing apparatus of claim 1 , wherein said conversion-processing varies depending on pixel values of said original image-signal.

Claim 14

An image-processing apparatus, in which a compensation-signal generated from a low-frequency component signal of an original image-signal, representing a plurality of pixels, is added to either said original image-signal or a lowest frequency image-signal of said original image-signal, in order to generate a processed image-signal, comprising: a conversion-processing section to apply a conversion-processing to unsharp image-signals, generated from said original image-signal in respect to a plurality of frequency bands, so as to generate converted unsharp image-signals; a differential processing section to generate differential image-signals, obtained from differences between said unsharp image-signals and said converted unsharp image-signals; and a compensation-signal calculating section to totally add said differential image-signals so as to generate a high-frequency component signal, and to calculate said compensation-signal by subtracting said low-frequency component signal from a converted low-frequency component signal, which is derived from a difference between said high-frequency component signal and said original image-signal.

Claim 15

An image-processing apparatus, in which a compensation-signal generated from a low-frequency component signal of an original image-signal, representing a plurality of pixels, is added to either said original image-signal or a lowest frequency image-signal of said original image-signal, in order to generate a processed image-signal, comprising: a conversion-processing section to apply a conversion-processing to unsharp image-signals, generated from said original image-signal in respect to a plurality of frequency bands, so as to generate converted unsharp image-signals; a differential processing section to generate differential image-signals, obtained from differences between said unsharp image-signals and said converted unsharp image-signals; and a compensation-signal calculating section to totally add said differential image-signals so as to generate a high-frequency component signal, and to calculate said compensation-signal by subtracting said low-frequency component signal from a converted low-frequency component signal, which is derived from a difference between said high-frequency component signal and said original image-signal.

Claim 16

The image-processing apparatus of claim 13 , wherein said conversion-processing is to convert pixel values of said unsharp image-signals, based on a non-linear transform.

Claim 17

The image-processing apparatus of claim 13 , wherein said conversion-processing is determined by said original image-signal or said unsharp image-signals in said plurality of frequency-bands.

Claim 18

The image-processing apparatus of claim 13 , wherein said conversion-processing is determined by said original image-signal or said unsharp image-signals in an adjacent pair of frequency-bands.

Claim 19

The image-processing apparatus of claim 13 , wherein said conversion-processing varies depending on either one of pixel value of said unsharp image-signals employed for generating said differential image-signals or pixel values of said original image-signal.

Claim 20

The image-processing apparatus of claim 13 , wherein said conversion-processing varies depending on said unsharp image-signals.

Claim 21

The image-processing apparatus of claim 13 , wherein said conversion-processing is a suppression-processing for suppressing an averaging-processing for averaging image-signals.

Claim 22

The image-processing apparatus of claim 19 , wherein the lower a frequency-band in which said unsharp image-signals reside is, the greater a degree of suppressing said averaging-processing for averaging said image-signals in said suppression-processing is.

Claim 23

The image-processing apparatus of claim 19 , wherein the higher a frequency-band in which said unsharp image-signals reside is, the stronger a power of suppressing said averaging-action for averaging said image-signals in said suppression-processing is.

Claim 24

The image-processing apparatus of claim 13 , wherein said conversion-processing varies depending on pixel values of said unsharp image-signals to be processed by said conversion-processing.

Claim 25

The image-processing apparatus of claim 13 , wherein said conversion-processing varies depending on pixel values of an unsharp image-signal at a lowest frequency-band.

Claim 26

The image-processing apparatus of claim 13 , wherein said conversion-processing varies depending on pixel values of said original image-signal.