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Interpolation for four-channel color filter array

A color filter and color technology, applied in the field of full-color images, can solve the problems of horizontal arrangement without panchromatic values, and achieve the effects of reducing color noise, increasing spectral bandwidth, and improving color space resolution

Active Publication Date: 2012-05-16
OMNIVISION TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While two rows of panchromatic pixels provide the arrangement of Figure 21C in the vertical direction, this horizontal arrangement of side-by-side panchromatic values ​​does not exist in Figure 24

Method used

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  • Interpolation for four-channel color filter array
  • Interpolation for four-channel color filter array
  • Interpolation for four-channel color filter array

Examples

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Embodiment Construction

[0043] In the following description, preferred embodiments of the present invention will be described in terms of items that would be readily implemented as a software program. Those skilled in the art will readily recognize that the software equivalent of this can also be implemented in hardware. Because image manipulation algorithms and systems are well known, this description will be directed specifically to algorithms and systems that form part of or cooperate more directly with systems and methods according to the present invention. Such algorithms and systems not specifically shown or described herein, and hardware or software for generating and otherwise processing image signals associated therewith, may be selected from such systems, algorithms, components, and elements known in the art other aspects. Software not specifically shown, suggested, or described herein useful for the practice of the invention is conventional and within the ordinary skill in the art in view...

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Abstract

A method is described for forming a full-color output image from a color filter array image comprising capturing an image using an image sensor including panchromatic pixels and color pixels having at least two different color responses, the pixels being arranged in a rectangular minimal repeating unit 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. The method further comprising, computing an interpolated panchromatic image from the color filter array image; computing an interpolated color image from the color filter array image; and forming the full color output image from the interpolated panchromatic image and the interpolated color image.

Description

technical field [0001] The present invention relates to generating a full-color image with improved spatial resolution from a color filter array image having color channels and panchromatic channels. Background technique [0002] Single-sensor digital cameras use color filter arrays (CFAs) to capture full color information from a single two-dimensional array of photosensitive pixels. A CFA consists of a color filter array that filters the light being detected by each pixel. Thus, each pixel receives light from only one color, or in the case of a panchromatic or "clear" filter, from all colors. To reproduce a full-color image from a CFA image, three color values ​​must be generated at each pixel location. This is achieved by interpolating missing color values ​​from adjacent pixel values. [0003] The best known CFA pattern uses three color channels as described by Bayer (US Pat. No. 3,971,065) and shown in FIG. 2 . Bayer CFA has three color channels, which achieve full c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/04G06T3/40H04N9/03H04N25/00
CPCH04N9/045G06T3/00H04N25/133H04N25/135H04N23/843
Inventor 詹姆斯·E·小亚当斯姆里秋杰伊·库马尔布鲁斯·哈罗德·皮尔曼詹姆斯·安德鲁·汉密尔顿
Owner OMNIVISION TECH INC
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