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Image capturing system, signal processing circuit, and signal processing method

An image capture and signal technology, applied in the field of image capture system, can solve the problem of not considering the fixed pattern noise, and achieve the effect of eliminating the fixed pattern noise

Active Publication Date: 2008-11-05
CANON KK
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technique does not take into account the fixed pattern noise generated by the pixel structure in an image sensing device including a plurality of pixels with different pixel structures.

Method used

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  • Image capturing system, signal processing circuit, and signal processing method
  • Image capturing system, signal processing circuit, and signal processing method
  • Image capturing system, signal processing circuit, and signal processing method

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Embodiment Construction

[0043] The present invention relates to signal processing of defective pixels in image sensing devices, and more particularly to signal correction in image capture systems having optically black regions containing multiple pixels with different pixel structures.

[0044] Terms used in the present invention will be defined. The optical black area has a plurality of pixel blocks. A pixel block is a unit formed by a plurality of pixels each including one or more elements having the same function as in the remaining pixels but having a different relative positional relationship (for example, a photoelectric conversion element and a Gate (transfer gate) transfer transistor, etc.). A pixel is a minimum unit for forming an image, and includes at least a photoelectric conversion element (for example, a photodiode).

[0045] A plurality of pixels included in each pixel block may share, for example, an amplification element (for example, an amplification transistor) or have an amplifi...

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Abstract

An image capturing system includes a signal correction unit which corrects a signal output from a defective pixel in an optical black region based on a signal output from a normal pixel. The optical black region has a plurality of pixel blocks. Each of the plurality of pixel blocks has a plurality of pixels each including one or more elements which have the same functions as in the remaining pixels and which have relative positions different from the remaining pixels. The signal correction unit corrects the signal output from the defective pixel in the optical black region based on a signal output from a normal pixel which is included in another pixel block different from the pixel block of the defective pixel in the optical black region and includes one or more elements having the same functions and same relative positions as in the defective pixel.

Description

technical field [0001] The present invention relates to an image capture system, a signal processing circuit and a signal processing method. Background technique [0002] Many image capturing systems such as digital cameras, video cameras, copiers, or facsimile devices include image sensing devices in which pixels each including a photoelectric conversion element are arranged one-dimensionally or two-dimensionally. The image sensing device includes a CCD image sensing device or an amplified image sensing device having an amplifying element in a pixel area. [0003] Recent image sensing devices tend to increase the number of pixels. As the area of ​​one pixel decreases, the area of ​​the photoelectric conversion element also tends to decrease. A photoelectric conversion element having a smaller area means that the amount of incident light per pixel becomes smaller. In an enlarged image sensing device having, for example, a plurality of elements in one pixel, the area occup...

Claims

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Application Information

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IPC IPC(8): H04N5/217H04N5/335H01L27/146H04N5/347H04N5/361H04N5/365H04N5/367H04N5/369H04N5/374H04N5/3745H04N101/00
Inventor 竹中真太郎园田一博木谷一成
Owner CANON KK
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