Image analysis – Color image processing
Patent
1993-03-30
1995-08-15
Boudreau, Leo H.
Image analysis
Color image processing
358520, 358518, 358537, 358518, 382254, H04N 146, G03F 308
Patent
active
054427177
ABSTRACT:
A sharpness processing apparatus for enhancing or suppressing tone variations in an original image. A lookup table for converting RGB signals into HSL values which are the three attributes of perceived colors is used to obtain HLS values of pixels in the original image stored in a frame memory. The HSL values of the pixels are successively compared with HSL values indicating an effective range of sharpness processing determined with reference to a designated reference color, to determine pixels to be subjected to the processing. The processing is effected by applying a parameter to the RGB signals of the pixels subjected to the processing. In this way, the apparatus facilitates designation of a region of sharpness processing. Besides, the value of the parameter is variable with differences between the HSL values of the pixels corresponding to the reference color and the HSL values of the pixels determined to be subjected to the processing, whereby the sharpness processing is effected without impairing smoothness of the original image.
REFERENCES:
patent: 4649423 (1987-03-01), Hoffrichter
patent: 4812903 (1989-03-01), Wagensonner et al.
patent: 5060060 (1991-10-01), Udagawa et al.
patent: 5134667 (1992-07-01), Suzuki
patent: 5335097 (1994-08-01), Murakami
Bella Matthew C.
Boudreau Leo H.
Dainippon Screen Mfg. Co,. Ltd.
LandOfFree
Sharpness processing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sharpness processing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sharpness processing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2189466