Computer graphics processing and selective visual display system – Computer graphics processing – Graphic manipulation
Reexamination Certificate
1999-05-04
2003-01-07
Luu, Matthew (Department: 2672)
Computer graphics processing and selective visual display system
Computer graphics processing
Graphic manipulation
C345S590000, C345S591000, C345S600000, C348S488000, C348S583000, C348S603000, C358S518000, C358S520000, C382S162000, C382S167000
Reexamination Certificate
active
06504551
ABSTRACT:
TECHNICAL FIELD
This invention relates to a color correction method and apparatus and picture processing method and apparatus used on the site of editing picture material.
BACKGROUND ART
On the editing site for picture material, such as a broadcasting station, the color temperature or color tone is adjusted by correcting the signal level of picture signals using a color correction device comprised of a picture processing device.
The color correction device is configured for performing primary processing and secondary processing. The primary processing corrects the signal level of the picture signals, mainly the luminance level, such as white level, black level or gamma correction. The secondary processing corrects the signal level of picture signals, mainly the color vector.
On the editing site, the above processing corrects fluctuations of the color temperature among editing materials recorded on different date and time. Thus, on the editing site, the processing characteristics are set on repeated pre-viewing, as the processing results are checked, so that fluctuations among materials are substantially indiscernible.
The color correction device is of the hardware structure with the use of a gate array or of the software structure by computational processing. On the broadcasting site, an apparatus by the hardware configuration is mainly used.
Meanwhile, in the conventional color correction device, the colors that can be set as processing objects (comprised of the source vector and generally comprised of six colors of red, green, blue, yellow, cyan and magenta) and the number thereof are limited such that fine adjustment of the color hue is correspondingly limited. Moreover, adjustment of characteristics, such as the range or degree for correction, is limited for these source vectors.
Thus, the conventional color correction device has a drawback that processing cannot be executed with high degree of freedom.
As a method for resolving this drawback, it may be contemplated to correct the signal level of the picture signals by the hardware configuration employing a lookup table and to vary the contents of the lookup table by operator setting. That is, if the signal level of the picture signals is corrected by the lookup table, the desired color can be set to the source vector, while the number of source vectors or the range of correction can be set to various values, thus enabling execution of processing to a high degree of freedom.
However, if the processing of high degree of freedom can be executed, it becomes correspondingly difficult for the operator to grasp correctly the degree of processing thus complicating the operation.
DISCLOSURE OF THE INVENTION
It is therefore an object of the present invention to provide a picture processing method and apparatus whereby processing to a high degree of freedom can be executed by a simplified operation.
It is another object of the present invention to provide a color correction method and apparatus whereby color correction can be made on designation of the color hue range.
It is yet another object of the present invention to provide a color correction method and apparatus whereby color correction can be made on designation of plural color hues.
The present invention provides a color correction device for correcting the color of plural pixels making up a source video image including parameter setting means for setting plural parameters for designating the source color and the destination color and computing means for computing correction data for color correction of the source color to the destination color, using plural parameters as set by the parameter setting means, storage means for storing the correction data computed by the computing means, and color correction means for correcting the color of a pixel associated with the source color contained in the source video image to the destination color, using the correction data stored in the storage means.
In the color correction device of the present invention, computation by the computing means is performed by a software program and the processing performed by the color correction means is performed by hardware.
In the color correction device of the present invention, the storage means is a lookup table for storing the pixel color and the correction data in association with each other.
In the color correction device of the present invention, the source color and the destination color are represented by a vector in a color space.
In the color correction device of the present invention, the parameter setting means includes means for setting parameters concerning the color hue angle and the saturation degree as parameters concerning the source color and the destination color, respectively.
In the color correction device of the present invention, the parameter setting means further includes gain setting means for setting the parameters concerning the gain value of the correction data and the computing means computes the correction data using parameters concerning the color hue angle and the saturation degree set by the parameter setting means as parameters for the source color and the destination color and parameters concerning the gain value set by the gain setting means.
In the color correction device of the present invention, the parameter setting means further includes color hue range setting means for setting parameters concerning the color hue range of the source color and, if the color contained in the source video image is within the color hue range as set by the color hue range setting means, the computing means computes the correction data using parameters concerning the color hue angle and the saturation degree set by the parameter setting means as parameters for the source color and the destination color and parameters concerning the gain value set by the gain setting means.
The present invention also provides a color correction device for correcting the colors of plural pixels making up a source video image including parameter setting means for setting plural parameters for prescribing the source color range and the destination color range in a color space, computing means for computing correction data for correcting the color contained in the source color range into the color contained in the destination color range and color correction means for correcting the pixel color to a color corresponding to the destination color range based on the corrected data contained in the source color range if the color of the pixel constituting the source video image is a color contained in the source color range.
In the color correction device of the present invention, the color hue direction of the source color range is defined by a source vector on the color space and the color hue direction of the destination color range is defined by the destination vector on the color space.
In the color correction device of the present invention, the parameter setting means includes means for setting at least parameters concerning the source color hue direction, source color hue range and the source saturation degree, as plural parameters prescribing the source color range and means for setting parameters concerning at least the destination color hue direction and destination saturation degree as plural parameters prescribing the destination color range.
In the color correction device of the present invention, the parameter setting means further includes gain setting means for setting parameters concerning the gain value of the correction data and the computing means computes the correction data using parameters concerning the source color hue direction, source color hue range and source saturation degree as set by the parameter setting means, parameters concerning the destination color hue direction and the destination saturation degree and parameters concerning the gain value as set by the gain setting means.
In the color correction device of the present invention, the gain setting means sets the gain value from one color hue to another so that the closer the color hue angle to be computed to the c
Moriwake Katsuakira
Takashima Akihiro
Usui Shoichi
Frommer William S.
Frommer & Lawrence & Haug LLP
Luu Matthew
Sajous Wesner
Savit Glenn F.
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