Image processing device and space image noise eliminating method

An image processing device and a technology for noise, applied in the directions of image communication, TV, color TV components, etc., can solve the problems of retaining image details, blurred images, unreachable, etc., and achieve the effect of retaining image details and filtering out image noise.

CN102447817AActive Publication Date: 2012-05-09REALTEK SEMICON CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-05-09

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Abstract

The embodiment of the invention discloses an image processing device and a space image noise eliminating method. The image processing device comprises an estimator, a noise detector and a space noise filter, wherein the estimator is used for estimating the local variance of each pixel of an input image signal and generating a noise critical value according the status of the local mutation value; the noise detector is used for determining which pixels in the pixels are noises or images according to the noise critical value; and the space noise filter is used for filtering the pixels which are noises and generating an output image signal.
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Description

Technical field

[0001] The present invention relates to an image processing device and method, in particular to an image processing device and method that can eliminate noise and preserve image details. Background technique

[0002] figure 1 A schematic diagram of an existing image processing device is shown. The general image processing device 10 uses a low-pass filter to eliminate noise. After receiving the input image signal Vi, the low-pass filter filters out high-frequency noise, and only retains low-frequency signals to generate an output image signal Vo.

[0003] However, in terms of spatial image noise elimination, the signal processing method of low-pass filter will not only eliminate noise, but also blur the image at the same time. The existing technology cannot achieve the effect of eliminating noise and retaining image details at the same time, so the image quality is poor. . Summary of the invention

[0004] An object of the present invention is to provide an image p...

Examples

Embodiment Construction

[0020] Figure 2A It shows a schematic diagram of an image processing apparatus according to an embodiment of the present invention. The image processing device 20 is suitable for noise elimination of spatial images, and while eliminating noises, it also preserves the details of the image.

[0021] The image processing device 20 includes an estimator (Estimator) 21, a noise detector (Noise detector) 22, and a Spatial De-noising Filter (Spatial De-noising Filter) 23.

[0022] The estimator 21 can be a Local Variance Estimator. The estimator 21 is used to estimate the local variance of each pixel of the input image signal Vi (such as the entire frame), and calculate a noise threshold Th according to the state of the local variance. In an embodiment, the local variation value state of the input image signal Vi can be obtained by referring to the maximum local variation value in some or all pixels and / or the average local variation value of some or all pixels.

[0023] In an embodiment...