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Image processing device and method for reducing image noise thereof

An image processing device and noise suppression technology, applied in the field of image processing, can solve the problems of memory consumption, high computational complexity, and the need for additional reference images, and achieve the effect of reducing computational complexity

Active Publication Date: 2014-10-29
IND TECH RES INST
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Problems solved by technology

[0004] In the current image noise suppression technology, the weight value of the filter can be dynamically adjusted to filter the image to obtain a good noise suppression effect, but there are problems such as high computational complexity, the need for additional reference images, and memory consumption. These noise suppression techniques are not easily integrated into video encoders or digital signal processors

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  • Image processing device and method for reducing image noise thereof
  • Image processing device and method for reducing image noise thereof
  • Image processing device and method for reducing image noise thereof

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[0038] In the image processing technology, the noise suppression in the image mostly uses a filter to perform convolution (Convolution) operation on each pixel, so the weight value of the mask used in the filter is the key factor affecting the image quality. Filters can be divided into fixed value filters and non-fixed value filters. The fixed-value filter uses the same low-pass filter mask to process each pixel. Its method is simple but it is easy to blur the image, such as the average filter and Gaussian filter. The non-fixed value filter dynamically adjusts the weight value of the mask in the filter according to the regional characteristics of each pixel. If the pixel is a boundary (high frequency), the weight value is higher, and the pixel is smooth (low frequency), the weight value is lower. In order to achieve the effect of suppressing noise and clearing the picture, well-known methods such as bi-directional filter and guided filter are used. However, both the Gaussian ...

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Abstract

An image processing device for reducing image noise and the method thereof are provided. The method for reducing image noise includes the following steps. A filtering operation is performed on a plurality of pixel values of a first image according to a high-pass (HP) filtering mask, a first default filtering mask and a second default filtering mask to obtain a high-pass filtering image, a first low-pass (LP) image and a second LP image, respectively. A difference between the first and the second LP images is calculated to obtain a LP difference image. A pixel weighting calculation is performed according to the HP image and the LP difference image to obtain a pixel weighting mask corresponding to the first image. The first image is calculated according to the pixel weighting mask and one of the first and the second LP images to obtain a noise reducing image.

Description

technical field [0001] The invention relates to an image processing technology, and in particular to an image processing device and an image noise suppression method thereof. Background technique [0002] The increasing sophistication of multimedia technology has gradually increased the demand for high-quality images. The quality of the image has a lot to do with the amount of noise that is generated during image capture, signal conversion, and transmission. In order to effectively remove noise and improve image quality, more and more attention has been paid to the research on noise removal in the field of image processing. The reason for the noise is, for example, the random noise generated by the image capture unit due to the change of the ambient light source, the noise generated by the circuit itself, or the noise generated during the image processing process (such as white balance, image interpolation). Therefore, images captured at night are usually accompanied by st...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/213G06T5/00
CPCG06T5/002G06T5/20G06T2207/20221
Inventor 蔡洛纬李国徵洪邦展
Owner IND TECH RES INST
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