PICTURE QUALITY CORRECTING CIRCUIT
PROBLEM TO BE SOLVED: To provide a picture quality correcting circuit generating a correction curve corresponding to a kind of an image by roughly deciding the image. SOLUTION: The picture quality correcting circuit is equipped with: a pixel sampling processing portion which extracts one pixel for e...
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| creator | SAKAUCHI MASAYUKI KIYAMA SHUJI FUKUCHI SHOWA ONODERA JUNICHI |
| description | PROBLEM TO BE SOLVED: To provide a picture quality correcting circuit generating a correction curve corresponding to a kind of an image by roughly deciding the image. SOLUTION: The picture quality correcting circuit is equipped with: a pixel sampling processing portion which extracts one pixel for every N (N: a natural number) pixels as to a luminance signal Y; a distribution detection portion which comprises a plurality of counters and counts up according to luminance levels of the pixels extracted by the pixel sampling processing portion to detect a histogram distribution by counting; a correction curve generation section generating a correction curve of the luminance signal Y based on this histogram distribution; and a gradation characteristic correction portion which corrects gradation characteristics by using the generated correction curve. The circuit is also is provided with: a spatial frequency detection portion which detects a spatial frequency; and a counter selection portion which selects counters. The correction curve generation portion is equipped with a limitation processing portion which adjusts a counted value from a counter selected by the counter selection portion and where pixels having low spatial frequency values are concentrated. COPYRIGHT: (C)2006,JPO&NCIPI |
| format | Patent |
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SOLUTION: The picture quality correcting circuit is equipped with: a pixel sampling processing portion which extracts one pixel for every N (N: a natural number) pixels as to a luminance signal Y; a distribution detection portion which comprises a plurality of counters and counts up according to luminance levels of the pixels extracted by the pixel sampling processing portion to detect a histogram distribution by counting; a correction curve generation section generating a correction curve of the luminance signal Y based on this histogram distribution; and a gradation characteristic correction portion which corrects gradation characteristics by using the generated correction curve. The circuit is also is provided with: a spatial frequency detection portion which detects a spatial frequency; and a counter selection portion which selects counters. The correction curve generation portion is equipped with a limitation processing portion which adjusts a counted value from a counter selected by the counter selection portion and where pixels having low spatial frequency values are concentrated. 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The correction curve generation portion is equipped with a limitation processing portion which adjusts a counted value from a counter selected by the counter selection portion and where pixels having low spatial frequency values are concentrated. 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SOLUTION: The picture quality correcting circuit is equipped with: a pixel sampling processing portion which extracts one pixel for every N (N: a natural number) pixels as to a luminance signal Y; a distribution detection portion which comprises a plurality of counters and counts up according to luminance levels of the pixels extracted by the pixel sampling processing portion to detect a histogram distribution by counting; a correction curve generation section generating a correction curve of the luminance signal Y based on this histogram distribution; and a gradation characteristic correction portion which corrects gradation characteristics by using the generated correction curve. The circuit is also is provided with: a spatial frequency detection portion which detects a spatial frequency; and a counter selection portion which selects counters. The correction curve generation portion is equipped with a limitation processing portion which adjusts a counted value from a counter selected by the counter selection portion and where pixels having low spatial frequency values are concentrated. COPYRIGHT: (C)2006,JPO&NCIPI</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION CRYPTOGRAPHY DISPLAY EDUCATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION SEALS |
| title | PICTURE QUALITY CORRECTING CIRCUIT |
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