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Pixel binning and averaging based on illumination

一种像素、亮度的技术，应用在二次抽样领域，能够解决低分辨率等问题，达到改进白平衡、改进空间抽样模式的效果

Active Publication Date: 2008-07-16
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This results in a low resolution image instead of the expected subsampling

Method used

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  • Pixel binning and averaging based on illumination
  • Pixel binning and averaging based on illumination
  • Pixel binning and averaging based on illumination

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Embodiment Construction

[0018] The present invention is specifically described on the basis of the model of the well-known Bayer color filter array. It will be appreciated that the present invention is applicable to both image sensors, namely CCD (Charge Coupled Device) and active pixel (also known as CMOS) image sensors. Note also that this two-dimensional array can be obtained in any image, whether it is a sensor or an image in electronic memory. Specifically, the present invention first describes the subsampling in the Y-axis direction, which also improves the subsampled blue pixel sensitivity (FIGS. 4a and 4b), and then describes the subsampling in the X-axis direction. Subsampling in the X-axis direction, which has similar blue sensitivity improvements (Figures 5a and 5b), will finally describe subsampling in the X-axis and Y-axis directions, which Subsampling in the Y-axis direction further improves the blue sensitivity (Figures 6a and 6b).

[0019] Referring to FIG. 4a, FIG. 4a is a top view...

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Abstract

A method for reading out pixel values for a two dimensional array, the method includes the steps of periodically combining at least two pixel values of a same first color in a first dimension of the two dimensional array; reading out the combined pixel values of the first color; and reading out pixels of a second color in the first dimension of the two dimensional array .

Description

technical field [0001] The present invention generally relates to the technical field of subsampling pixels of an image sensor. More specifically, the present invention relates to pixel subsampling of image sensors that vary pixel sensitivity to account for variations in scene brightness. Background technique [0002] Image sensor subsampling is performed to reduce spatial resolution for purposes such as increasing processing speed. As shown in Figure 1, it shows a Bayer color filter array (CFA) used to produce a color image on an image sensor. As shown in FIG. 2, in order to reduce the resolution, the image sensor is sub-sampled by ignoring some pixels (marked by X) in the prior art. Alternatively, as shown in FIG. 3 , in the prior art, the resolution is also reduced by merging pixels. At this point, the individual colors are merged horizontally and vertically as shown by the curve. The final subsampled images for Figures 2 and 3 have sample eigenvalues ​​that represent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N3/15
CPCH04N25/445H04N25/46H04N25/447H04N23/84H04N25/134H04N25/40
Inventor J·T·坎普顿
Owner OMNIVISION TECH INC