# US 7,746,397 B2 · Image device having color filter

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- Number: US 7,746,397 B2
- Document ID: US7746397B2
- Status: Granted
- Kind: B2
- Application number: 11/269,366
- Filed: 2005-11-08
- Published: 2006-05-18
- Granted: 2010-06-29
- Earliest claimed: 2004-11-13
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Jung-Hyun Nam
- Web page: https://patentgrep.com/patent/US7746397B2

## CPC

- H04N 25/134: {based on three different wavelength filter elements}
- H04N 2209/045: using mosaic colour filter
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image device comprises an image sensor including an array of photodiodes for converting an optical image into electrical signals, a color filter comprising an array of red, green and cyan filter elements disposed opposite the array of photodiodes, and a color processor for color processing the electrical signals.

## Claims

### Claim 1

An image device comprising: an image sensor including an array of photodiodes for converting an optical image into electrical signals;
a color filter comprising an array of red, green and cyan filter elements disposed opposite the array of photodiodes; and
a color processor for color processing the electrical signals;
wherein a saturation output of a red or green pixel is determined at a luminance of white light at which a saturated output of cyan pixel is sensed; and
wherein the output of green pixel at the luminance of the white light where the saturated output of cyan pixel is sensed is about ⅔ the saturated output of cyan pixel when sensitivity to the blue filter element is about ½ of the sensitivity to the green filter element.

### Claim 2 (depends on 1)

The image device of claim 1, wherein the image sensor senses the electrical signals, which are analog signals, using a progressive scan method.

### Claim 3 (depends on 1)

The image device of claim 1, the image sensor further comprises a converter which converts the electrical signals into digital signals.

### Claim 4 (depends on 1)

The image device of claim 1, wherein the color processor subtracts signal values regarding the green pixel from signal values regarding the cyan pixel among digital signals to obtain signal values regarding blue pixel, and color processes the digital signal values to obtain image data.

### Claim 5

A method of color processing comprising:
detecting a luminance of light filtered by a color filter comprising an array of red, green and cyan filter elements disposed in a Bayer pattern;
outputting electrical signals based on the luminance of light;
converting the electrical signals into digital signals via an analog-to-digital converter; and
outputting the digital signals to a color processor for color processing;
wherein a saturation output of a red or green pixel is determined at a luminance of white light at which a saturated output of cyan pixel is sensed; and
wherein the output of green pixel at the luminance of the white light where the saturated output of cyan pixel is sensed is about ⅔ the saturated output of cyan pixel when sensitivity to the blue filter element is about ½ of the sensitivity to the green filter element.

### Claim 6 (depends on 5)

The method of claim 5, wherein the color processor subtracts signal values regarding the green pixel from signal values regarding the cyan pixel among digital signals to obtain signal values regarding blue pixel, and color processes the digital signal values to obtain image data.