| US 7,526,141 B2 | ||
| Correcting image gradation based on neighboring pixels | ||
| Masami Ogata, Kanagawa (Japan); Takashi Tsuchiya, Tokyo (Japan); and Kazuhiko Ueda, Kanagawa (Japan) | ||
| Assigned to Sony Corporation, Tokyo (Japan) | ||
| Filed on Nov. 03, 2006, as Appl. No. 11/592,155. | ||
| Application 11/592155 is a division of application No. 10/802600, filed on Mar. 16, 2004, granted, now 7,440,612. | ||
| Application 10/802600 is a division of application No. 09/434565, filed on Nov. 12, 1999, abandoned. | ||
| Claims priority of application No. 10-323051 (JP), filed on Nov. 13, 1998; application No. 10-327785 (JP), filed on Nov. 18, 1998; application No. 10-328909 (JP), filed on Nov. 19, 1998; and application No. 10-328937 (JP), filed on Nov. 19, 1998. | ||
| Prior Publication US 2007/0047034 A1, Mar. 01, 2007 | ||
| Int. Cl. G06K 9/40 (2006.01); G06K 9/00 (2006.01); H04N 9/68 (2006.01) | ||
| U.S. Cl. 382—274 [382/167; 348/234] | 30 Claims |
| 1. An image processing apparatus capable of correcting gradation of image data formed from a brightness signal and a color
signal sequentially superposed on the brightness signal in a time divisional relationship, comprising:
characteristic amount detection means for successively detecting a characteristic amount indicative of a predetermined range
neighboring to pixels of the image data;
area discrimination means for discriminating areas to which the image data belong based on the characteristic amount and outputting
discrimination results;
coefficient calculation means for outputting correction coefficients to be used for correcting the pixel values of the image
data based on the discrimination results; and
correction means for correcting the pixel values of the image data using the correction coefficients, wherein
the coefficient calculation means sets the correction coefficients at a fixed value when a signal level of the discrimination
results is less than or equal to a prescribed value, and the coefficient calculation means sets the correction coefficients
at a value less than the fixed value when the signal level of the discrimination results is greater than the prescribed value.
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