Color image processing device and color image processing method
First Claim
Patent Images
1. A color image processing device comprising:
- a color space converter for converting image signals to luminance signals corresponding to luminance and first and second chromaticity signals corresponding to chromaticity;
a luminance signal correcting unit for correcting the luminance signal of a target pixel based on an average luminance signal obtained from luminance signals of the target pixel and predetermined pixels surrounding the target pixel, and a saturation signal corresponding to saturation of the target pixel;
a chromaticity signal correcting unit for correcting the first and second chromaticity signals of the target pixel based on first and second average chromaticity signals obtained from the chromaticity signals of the target pixel and the predetermined pixels surrounding the target pixel, the saturation signal of the target pixel, an average saturation signal of the target pixel and the predetermined pixels surrounding the target pixel, and a hue difference signal representing color similarity which is obtained from the first and second chromaticity signals and the first and second average chromaticity signals; and
a color space inverter for inverting the corrected luminance signal, the corrected first chromaticity signal and the corrected second chromaticity signal to image signals.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides a color image processing device and a color image processing method which is In order to perform natural and excellent sharpness processing to image data, the color image processing device of invention comprises: a color space converter (1) for converting image signals (RGB) to luminance signals (L), first chromaticity signals (C1) and second chromaticity signals (C2); a luminance signal correcting unit for correcting the luminance signal (L) of a target pixel based on an average luminance signal (LA) obtained from the luminance signals of the target pixel and predetermined pixels surrounding the target pixel and the saturation signal (S) of the target pixel; a chromaticity signal correcting unit for correcting the first chromaticity signal (C1) and the second chromaticity signal (C2) of the target pixel based on the first and second average chromaticity signals (C1A, C2A) obtained from the chromaticity signals of the target pixel and the predetermined pixels surrounding the target pixel, the saturation signal (S) of the target pixel, the average saturation signal (SA) obtained from the saturation signals of the target pixel and the predetermined pixels surrounding the target pixel, and a hue difference signal (DC); and a color space inverter (15) for inverting the corrected luminance signal (L′), the corrected first chromaticity signal (C1′) and the corrected second chromaticity signal (C2′) of the target pixel to image signals (R′G′B′).
83 Citations
19 Claims
-
1. A color image processing device comprising:
-
a color space converter for converting image signals to luminance signals corresponding to luminance and first and second chromaticity signals corresponding to chromaticity;
a luminance signal correcting unit for correcting the luminance signal of a target pixel based on an average luminance signal obtained from luminance signals of the target pixel and predetermined pixels surrounding the target pixel, and a saturation signal corresponding to saturation of the target pixel;
a chromaticity signal correcting unit for correcting the first and second chromaticity signals of the target pixel based on first and second average chromaticity signals obtained from the chromaticity signals of the target pixel and the predetermined pixels surrounding the target pixel, the saturation signal of the target pixel, an average saturation signal of the target pixel and the predetermined pixels surrounding the target pixel, and a hue difference signal representing color similarity which is obtained from the first and second chromaticity signals and the first and second average chromaticity signals; and
a color space inverter for inverting the corrected luminance signal, the corrected first chromaticity signal and the corrected second chromaticity signal to image signals. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A color image processing device comprising:
-
a color space converter for converting image signals to lightness signals corresponding to lightness, saturation signals corresponding to saturation and hue signals corresponding to hue;
a lightness signal correcting unit for correcting the lightness signal of a target pixel based on an average lightness signal obtained from the lightness signals of the target pixel and predetermined pixels surrounding the target pixel, and the saturation signal;
a saturation signal correcting unit for correcting the saturation signal of the target pixel based on an average saturation signal obtained from the saturation signals of the target pixel and the predetermined pixels surrounding the target pixel, and an average hue signal obtained from the hue signals of the target pixel and the predetermined pixels surrounding the target pixel; and
a color space inverter for inverting the corrected lightness signal, the corrected saturation signal and the hue signal to image signals. - View Dependent Claims (8, 9, 10, 11, 13, 14, 15, 17, 18, 19)
-
-
12. A color image processing method comprising the steps of:
-
(a) converting image signals to luminance signals corresponding to luminance, and first and second chromaticity signals corresponding to chromaticity;
(b) correcting the luminance signal of a target pixel based on an average luminance signal obtained from the luminance signals of the target pixel and predetermined pixels surrounding the target pixel, and a saturation signal corresponding to saturation of the target pixel;
(c) correcting the first and second chromaticity signals of the target pixel based on first and second average chromaticity signals obtained from the chromaticity signals of the target pixel and the predetermined pixels surrounding the target pixel, the saturation signal of the target pixel, the average saturation signal, and a hue difference signal representing color similarity obtained from the first and second chromaticity signals and the first and second average chromaticity signals; and
(d) inverting the corrected luminance signal, the corrected first chromaticity signal and the corrected second chromaticity signal to image signals.
-
-
16. A color image processing method comprising the steps of:
-
(a) converting image signals to lightness signals corresponding to lightness, saturation signals corresponding to saturation and hue signals corresponding to hue;
(b) correcting the lightness signal of a target pixel based on an average lightness signal obtained from the lightness signals of the target pixel and pixels surrounding the target pixel, and the saturation signal;
(c) correcting the saturation signal of the target pixel based on an average saturation signal obtained from the saturation signals of the target pixel and the predetermined pixels surrounding the target pixel, and an average hue signal obtained from the hue signals of the target pixel and the predetermined pixels surrounding the target pixel; and
(d) inverting the corrected lightness signal, the corrected saturation signal and the hue signal to image signals.
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeNEC Corporation
-
Original AssigneeNEC Corporation
-
InventorsHirao, Koichiro
-
Granted Patent
-
Time in Patent OfficeDays
-
Field of Search
-
US Class Current382/167
-
CPC Class CodesG06T 2207/10024 Color imageG06T 2207/20192 Edge enhancement; Edge pres...G06T 5/003 Deblurring; Sharpening vibr...G06T 5/20 using local operatorsG06T 5/73 Deblurring; SharpeningH04N 1/608 within the L, C1, C2 colour...
