Median computation-based integrated color interpolation and color space ...

(12) United States Patent

Acharya

US006366692B1

(io) Patent No.: US 6,366,692 Bl (45) Date of Patent: *Apr. 2,2002

(54) MEDIAN COMPUTATION-BASED

INTEGRATED COLOR INTERPOLATION
AND COLOR SPACE CONVERSION
METHODOLOGY FROM 8-BIT BAYER
PATTERN RGB COLOR SPACE TO 24-BIT
CIE XYZ COLOR SPACE

(75) Inventor: Tinku Acharya, Tempe, AZ (US)

(73) Assignee: Intel Corporation, Santa Clara, CA (US)

( * ) Notice: This patent issued on a continued prosecution application filed under 37 CFR 1.53(d), and is subject to the twenty year patent term provisions ol 35 U.S.C. 154(a)(2).

Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

This patent is subject to a terminal disclaimer.

(21) Appl. No.: 09/050,743

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OTHER PUBLICATIONS

"Interactions Between Color Plane Interpolation and Other Image Processing Functions in Electronic Photgraphy," James E. Adams, Jr., SPIE (The International Society for Optical Engineering), vol. 2416 (Electronic Imaging '95), pp. 144-155 (Jul. 1995).

* cited by examiner

Primary Examiner—Leo Boudreau
Assistant Examiner—Ishrat Sherali

(74) Attorney, Agent, or Firm—Blakely, Sokoloff, Taylor & Zalman LLP

(57) ABSTRACT

What is disclosed is an integrated color interpolation and color space conversion technique and apparatus. A raw image that is arranged in a Bayer pattern where each pixel has only one of the color components needed to form a full color resolution pixel may be converted using this technique directly to a XYZ space image without any intermediate conversion or interpolation steps. Specifically, in one instance, an 8-bit Bayer pattern raw image may be converted directly to a 24-bit XYZ space in a single pass approach. Such an integrated technique may more readily and inexpensively implemented in hardware such as on a digital camera, or in software.

15 Claims, 6 Drawing Sheets