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Temporal filtering techniques for image signal processing

A time-domain filtering, image signal technology, applied in image data processing, solid-state image signal generator, image communication, etc.

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

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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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  • Temporal filtering techniques for image signal processing
  • Temporal filtering techniques for image signal processing
  • Temporal filtering techniques for image signal processing

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Embodiment Construction

[0072] 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.

[0073] When introducing elements of the various embodiments of the present disclosure, t...

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Abstract

Various techniques for temporally filtering raw image data acquired by an image sensor are provided. In one embodiment, a temporal filter determines a spatial location of a current pixel and identifies at least one collocated reference pixel from a previous frame. A motion delta value is determined based at least partially upon the current pixel and its collocated reference pixel. Next, an index is determined based upon the motion delta value and a motion history value corresponding to the spatial location of the current pixel, but from the previous frame. Using the index, a first filtering coefficient may be selected from a motion table. After selecting the first filtering coefficient, an attenuation factor may be selected from a luma table based upon the value of the current pixel, and a second filtering coefficient may subsequently be determined based upon the selected attenuation factor and the first filtering coefficient. The temporally filtered output value corresponding to the current pixel may then be calculated based upon the second filtering coefficient, the current pixel, and the collocated reference pixel.

Description

[0001] This application is a continuation-in-part of US Patent Application No. 12 / 582,414, filed October 20, 2009. technical field [0002] 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 [0003] 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. [0004] In recent years, digital imaging devices have become more popular, at least in part because these devices have become more affordable to the avera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50H04N5/232H04N5/14H04N9/04H04N23/12
CPCG06T2207/20182H04N23/951H04N23/741G06T5/94G06T5/70
Inventor G·科特J·E·弗莱德瑞克森
Owner APPLE INC
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