System and method for detecting and correcting defective pixels in an image sensor

An image sensor, pixel technology, used in image communication, picture signal generators, components of TV systems, etc.

Inactive Publication Date: 2012-08-15
ALLLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these conventional demosaicing techniques may not sufficiently account for the location and orientation of edges within the image, which may lead to edge artifacts, such as aliasing ( aliasing), checkerboard or rainbow artifacts

Method used

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  • System and method for detecting and correcting defective pixels in an image sensor
  • System and method for detecting and correcting defective pixels in an image sensor
  • System and method for detecting and correcting defective pixels in an image sensor

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Embodiment Construction

[0067] One or more specific embodiments of the present disclosure will be described below. These described embodiments are merely examples of the presently disclosed technology. Furthermore, in an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any of these actual implementations, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developer's specific goals, such as compliance with Systematic and commercial restrictions. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nonetheless be a routine design, production, and fabrication undertaking of those of ordinary skill in the art having the benefit of this disclosure.

[0068] When introducing elements of the various embodiments of the present disclosure, t...

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PUM

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Abstract

Various techniques are provided for the detection and correction of defective pixels in an image sensor. In accordance with one embodiment, a static defect table storing the locations of known static defects is provided, and the location of a current pixel is compared to the static defect table. If the location of the current pixel is found in the static defect table, the current pixel is identified as a static defect and is corrected using the value of the previous pixel of the same color. If the current pixel is not identified as a static defect, a dynamic defect detection process includes comparing pixel-to-pixel gradients between the current pixel a set of neighboring pixels against a dynamic defect threshold.; If a dynamic defect is detected, a replacement value for correcting the dynamic defect may be determined by interpolating the value of two neighboring pixels on opposite sides of the current pixel in a direction exhibiting the smallest gradient.

Description

technical field [0001] The present disclosure relates generally to digital imaging devices, and more particularly, to systems and methods for processing image data obtained using an image sensor of a digital imaging device. Background technique [0002] This section serves to introduce the reader to various aspects of art that are related to various aspects of the technology that are described and / or claimed below. It is believed that this discussion helps to provide the reader with background information to better understand the various aspects of this disclosure. Accordingly, these statements are to be read with the understanding that they are in this regard, and not an admission that they are prior art. [0003] In recent years, digital imaging devices have become more popular, at least in part because these devices have become more affordable to the average consumer. Also, in addition to some stand-alone digital cameras that are just coming to market, it is not uncommo...

Claims

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Application Information

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IPC IPC(8): H04N5/357H04N5/359H04N5/367H04N5/232H04N9/04
CPCH04N25/63H04N23/80H04N25/62H04N25/683H04N23/81H04N25/60
Inventor G·科特J·E·弗莱德瑞克森
Owner ALLLE INC
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