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Image sensor apparatus and method for color correction with an illuminant-dependent color correction matrix

An image sensor and color correction technology, applied in image communication, image signal generator, signal generator with a single pick-up device, etc., can solve the problems of increasing storage space and computing cost

Inactive Publication Date: 2011-01-05
OMNIVISION TECH INC
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Problems solved by technology

Depending on the number of light sources used, this can significantly increase storage and computational costs for image sensor devices

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  • Image sensor apparatus and method for color correction with an illuminant-dependent color correction matrix
  • Image sensor apparatus and method for color correction with an illuminant-dependent color correction matrix
  • Image sensor apparatus and method for color correction with an illuminant-dependent color correction matrix

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[0027] The present invention provides an image sensor device that uses a light source-dependent color correction matrix for color correction. As in general usage, an image sensor here may be a semiconductor circuit having an array of pixels to capture an optical image and process it into an electrical signal in the form of pixel data. The apparatus also includes a color correction module for generating a light source dependent color correction matrix and applying the matrix to pixel data captured by the image sensor to output a color corrected digital image.

[0028] As used generally, a color correction matrix here is a two-dimensional N×M matrix of color correction coefficients that transforms device-dependent values ​​into device-independent values, where N corresponds to Dimension (such as 3 of RGB color space), M corresponds to the dimension of device-independent color space (such as 3 of RGB color space or CIE XYZ color space). A color correction matrix may be stored in...

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Abstract

An image sensor apparatus is disclosed. The image sensor apparatus includes an image sensor for generating pixel data corresponding to a scene under a scene illuminant. The image sensor apparatus also includes a memory for storing color correction information corresponding to a subset of candidate illuminants. A color correction module in the image sensor apparatus derives an illuminant-dependent color correction matrix based on the color correction information corresponding to the subset of candidate illuminants and applies the illuminant-dependent color correction matrix to the pixel data to generate a color corrected digital image.

Description

technical field [0001] In general, the present invention relates to color correction in image sensor devices; more specifically, the present invention relates to an image sensor device and method for color correction using a light source-dependent color correction matrix. Background technique [0002] Image sensors are semiconductor devices that capture and process light signals into electrical signals to form still images or video. Image sensors are widely used in various consumer, industrial and scientific research applications, including digital still cameras, digital video cameras, handheld telephone devices, webcams, medical applications, automotive applications, games and toys, security and surveillance, image recognition And car inspections and more. The technology to make image sensors is also advancing rapidly. [0003] Currently, there are mainly two types of image sensors: Charge Coupled Device (CCD) sensors and Complementary Metal Oxide Semiconductor (CMOS) sen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/64H04N9/07H04N9/73H04N23/12
CPCH04N9/735H04N9/67H04N1/6086H04N1/6077H04N23/88H04N23/85
Inventor 李兆建
Owner OMNIVISION TECH INC
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