Image noise reduction device

An image noise reduction and noise reduction technology, applied in the field of image processing, can solve problems such as blurred image details, unfavorable hardware implementation, and complicated calculation process, and achieve the effects of filtering out noise, facilitating hardware implementation, and simplifying the processing flow

Active Publication Date: 2014-07-16
ZHEJIANG UNIVIEW TECH CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

The calculation process is complicated, which is not conducive to hardware implementation. While achieving noise reduction, the image details are blurred, and the noise reduction effect is not ideal.

Method used

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] The present invention provides an image denoising device, which is applied to image processing equipment, and is realized in a soft manner below. like figure 2 As shown, the display device includes CPU, memory, non-volatile memory and other hardware. The image noise reduction device is a virtual device on a logical level, and it is operated by a CPU. The device includes a noise parameter estimation unit, an image texture detection unit, an image similarity detection unit and a noise reduction processing unit.

[0017] The noise parameter estimation unit is used to obtain the Bayer format RAW data under the corresponding gain by adjusting different gains when exposing the preset standard color blocks of the test card, and calculate the corresponding slopes under different gains for the Bayer format RAW data components and the intercept to obtain the noise t...

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Abstract

The invention provides an image noise reduction device. According to the device, when preset standard color lumps of a test card are exposed, different gains are adjusted, so that RAW data of different gains are obtained, the slope and the intercept are calculated, and a noise threshold value of a pixel point is obtained; the pixel point with noise to be reduced serves as the center, the maximum luminance difference value and the minimum luminance difference value between other pixel points in a preset region and the pixel point are obtained, and the image texture degree value of the pixel point is determined; according to the maximum luminance difference value, the minimum luminance difference value and the image texture degree value, the lower limit threshold value and the upper limit threshold value of similarity of the pixel point are calculated; according to the difference value between each pixel point in the preset region and the pixel point with noise to be reduced, the lower limit threshold value of similarity and the upper limit threshold value of similarity, the weighed value of each pixel point is calculated, and the luminance value with noise removed is obtained. According to the device, image details are kept as many as possible, noisy points of an image are filtered out effectively, the processing procedure is simplified, and achievement through hardware is convenient.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image noise reduction device. Background technique [0002] During the process of image acquisition, transmission, storage, etc., the image quality is often reduced due to the interference of various noises, which has an adverse effect on subsequent image processing. Therefore, image noise reduction plays a decisive role in image quality. Noise in image sensor integrated circuits can be divided into device electronic noise and environmental noise. Among them, environmental noise refers to the random interference of the circuit by power supply, ground wire, substrate, etc., or environmental temperature changes, clock jitter, electromagnetic interference, etc., which affect the image sensor through the coupling of peripheral circuits. These noises can be well suppressed by circuit design, and will not directly affect the image quality. Electronic noise is the inherent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/20G06T5/00
Inventor 王智玉李婵朱旭东
Owner ZHEJIANG UNIVIEW TECH CO LTD
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