COLOR FILTER ARRAY PATTERN HAVING FOUR-CHANNELS

• US 20100309350A1
• Filed: 06/05/2009
• Published: 12/09/2010
• Est. Priority Date: 06/05/2009
• Status: Active Grant

• Current Assignee: Omnivision Technologies Incorporated (Will Semiconductor Co., Ltd. Shanghai)
• Original Assignee: Omnivision Technologies Incorporated (Will Semiconductor Co., Ltd. Shanghai)
• Inventors: Pillman, Bruce H., Kumar, Mrityunjay, Adams, James E. JR., Hamilton, James A.
• Granted Patent: US 8,125,546 B2
• Time in Patent Office: Days
• US Class Current: 348/280
• CPC Class Codes: H01L 27/14621 Colour filter arrangements
• CPC Class Codes: H04N 23/12 with one sensor only
• CPC Class Codes: H04N 23/843 Demosaicing, e.g. interpolating colour pixel values
• CPC Class Codes: H04N 25/133 including elements passing panchromatic light, e.g. filters passing white light
• CPC Class Codes: H04N 25/135 based on four or more different wavelength filter elements

Abstract

An image sensor for capturing a color image comprising a two dimensional array of light-sensitive pixels including panchromatic pixels and color pixels having at least three different color responses, the pixels being arranged in a rectangular minimal repeating unit having at least eight pixels and having at least two rows and two columns, wherein for a first color response, the color pixels having the first color response alternate with panchromatic pixels in at least two directions, and for each of the other color responses there is at least one row, column or diagonal of the repeating pattern that only has color pixels of the given color response and panchromatic pixels.

Claims

1. An image sensor for capturing a color image comprising a two dimensional array of light-sensitive pixels including panchromatic pixels and color pixels having at least three different color responses, the pixels being arranged in a rectangular minimal repeating unit having at least eight pixels and having at least two rows and two columns, wherein for a first color response, the color pixels having the first color response alternate with panchromatic pixels in at least two directions, and for each of the other color responses there is at least one row, column or diagonal of the repeating pattern that only has color pixels of the given color response and panchromatic pixels.

2. The image sensor of claim 1 wherein the color pixels are red, green and blue pixels.

3. The image sensor of claim 2 wherein the minimal repeating unit has four rows and four columns, and wherein the first and third rows of the minimal repeating unit have a pixel sequence of green, panchromatic, green, panchromatic, the second row of the minimal repeating unit has a pixel sequence of panchromatic, red, panchromatic, panchromatic, and the fourth row of the minimal repeating unit has a pixel sequence of panchromatic, panchromatic, panchromatic, blue.

4. The image sensor of claim 1 wherein the color pixels are cyan, magenta and yellow pixels.

5. The image sensor of claim 1 wherein the minimal repeating unit has four rows or four columns, and wherein the color pixels for each color response alternate with the panchromatic pixels for at least one row, column or diagonal of the repeating pattern.

6. The image sensor of claim 1 wherein the minimal repeating unit has at least twice as many pixels having a first color response than pixels having a second color response.

7. The image sensor of claim 6 wherein the first color response is green and the second color response is red or blue.

8. The image sensor of claim 1 wherein the panchromatic pixels are arranged in a checkerboard pattern.

9. The image sensor of claim 1 wherein the panchromatic pixels are arranged in alternating rows or columns.

10. An image sensor for capturing a color image comprising a two dimensional array of light-sensitive pixels including panchromatic pixels and color pixels having at least two different color responses, the pixels being arranged in a rectangular minimal repeating unit having at least eight pixels and having at least two rows and two columns, wherein the color pixels of at least one color response alternate with panchromatic pixels in at least two directions, and wherein for each of the other color responses the color pixels for a given color response either alternate with panchromatic pixels in at least one direction or have at least two adjacent panchromatic pixels on both sides of the color pixels in at least two directions.