Video signal correction device

• US 5,510,850 A
• Filed: 11/18/1994
• Issued: 04/23/1996
• Est. Priority Date: 05/25/1989
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kawahara, Hideo, Ueda, Osamu, Hieda, Teruo
• Primary Examiner(s): GARBER, WENDY RAE
• Application Number:
  US08/341,697
• Time in Patent Office: 522 Days
• Field of Search: 348/624, 348/649, 348/651, 348/652, 348/653, 348/654
• US Class Current: 348/649
• CPC Class Codes: H04N 9/64 Circuits for processing colour signals H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84

Abstract

This invention is related to a video signal color correction device. Color information signal inputs are received in rectangular form. A coordinates conversion means converts the inputs into polar coordinates using one of the inputs as a polar axis. The device has a correction data storing means in which are stored luminance signal correction data dependent on a luminance signal and the polar coordinates and color information signal correction data. The correction data storing means outputs the luminance signal correction data and the color information signal correction data in accordance with the luminance signal and the polar coordinates. A correction means corrects the luminance signal and the polar coordinates on the basis of the luminance signal correction data and the color information signal correction data output from the correction data storing means. The correction means may include addition means for adding the luminance signal correction data to the luminance signal and the color information signal correction data to the polar coordinates.

Claims

1. A video signal correction device for correcting a video signal, comprising:

a) coordinates conversion means, arranged to input two kinds of color information signals, for producing polar coordinates data by using one of the input two kinds of color information signals as a polar axis;

b) correction data storing means for storing luminance signal correction data, depending on a luminance signal and the polar coordinates data output from said coordinates conversion means, and color information signal correction data and for outputting the stored luminance signal correction data and the color information signal correction data in accordance with said luminance signal and the polar coordinates data output from said coordinates conversion means; and

c) correction means for correcting said luminance signal and the polar coordinates data output from said coordinates conversion means on the basis of said luminance signal correction data and the color information signal correction data output from said correction data storing means.

2. A device according to claim 1, wherein said correction means includes addition means for adding the luminance signal correction data and the color information signal correction data to said luminance signal and the polar coordinates data output from said coordinates conversion means, respectively.

3. A video signal correction device, comprising:

a) conversion means for receiving a first color information data, and converting the received first color information data into a second color information data;

b) correction data storing means, having a memory device stored with a plurality of kinds of luminance correction data and color information correction data corresponding respectively to a luminance data and the second color information data output from said conversion means, for reading out the luminance correction data and the color information correction data from the memory device in accordance with said luminance data and the second color information data output from the conversion means; and

c) correction means for correcting the luminance data and the second color information data output from the conversion means by using the luminance correction data and the color information correction data output from the correction data storing means.

4. A device according to claim 3, wherein said correction data storing means includes addition means for adding the luminance correction data and the color information correction data to the luminance data and the second color information data output from said conversion means, respectively.

5. A device according to claim 3, wherein said second color information data has an information amount different from that of the first color information data.

6. A device according to claim 3, wherein said second color information data shows color components different from those of the first color information data.