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Methods and systems for locally adaptive image processing filters

An image and image frame technology, applied in the field of signal processing, can solve problems such as boundary blurring

Active Publication Date: 2008-05-21
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the averaging scheme smoothes the image by suppressing noise, it blurs the boundaries of objects in the image by blocking any sudden changes in pixel values ​​and replacing them with gradients

Method used

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  • Methods and systems for locally adaptive image processing filters
  • Methods and systems for locally adaptive image processing filters
  • Methods and systems for locally adaptive image processing filters

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Embodiment Construction

[0036] The invention relates to a non-linear local adaptive filtering method and system for suppressing and reducing noise and preserving clear edge image filtering. In order to calculate the weighted average value, the filter of the present invention not only considers the geometric position of the target pixel relative to its surrounding pixels, but also considers the relationship of their corresponding data. In the following description, certain specific details are given only to facilitate a thorough understanding of specific embodiments of the present invention. One skilled in the art will recognize, however, that the invention can be practiced without one or more of these specific details, or that the invention can be practiced without other methods, elements, materials, or the like. In addition, well-known structures, materials, and operations are not shown or described in detail in order to clearly describe the various embodiments of the present invention.

[0037] In...

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Abstract

The present disclosure provides methods and systems for image processing by locally adaptive filters that preserve the edges while smoothing the image. In the exemplary method, a filter adjusts image pixel values utilizing a locally adaptive weighted average method. To adjust the value of a target pixel, the filter uses the data corresponding to some of its surrounding pixels and modifies the weights in an inverse relation with both their distance from the target pixel and the difference between their data. Various embodiments present different schemes for selection of surrounding pixels and computation of weighted average values.

Description

technical field [0001] The present invention relates to a method and system for signal processing, more specifically, the present invention relates to a method and system for image processing, smoothing and enhancement. Background technique [0002] Filtering is one of the most fundamental operations in the field of signal processing. Filtering performs a variety of operations on analog or digital signals for noise suppression, data compression, and feature enhancement. A filter can be a physical element, such as a circuit or an electronic loop in a signal path, or it can be a set of mathematical operations performed on different characteristics of a signal, such as its magnitude or phase, or it can be any Other operations (usually non-random). [0003] One branch of signal processing is image processing. A digital image is a collection of dots with different brightness and color, these dots are called pixels, which have a certain, limited physical size. When storing or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21G06T5/00G06T5/20H04N5/208
CPCG06T2207/20012G06T2207/10016G06T5/001G06T5/20H04N5/21G06T5/002H04N5/208G06T5/70
Inventor 詹森单
Owner OMNIVISION TECH INC
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