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Image noise elimination method in optical indicating device

A technology for indicating device and image noise, applied in image communication, parts of color TV, parts of TV system, etc., can solve problems such as incomplete noise elimination, achieve high elimination efficiency and performance, use less resources, realize simple method effect

Inactive Publication Date: 2013-10-02
益海芯电子技术江苏有限公司
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Problems solved by technology

[0006] The object of the present invention is to provide a method for eliminating image noise in an optical indicating device to solve the problem of incomplete noise elimination in the prior art

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  • Image noise elimination method in optical indicating device

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Embodiment Construction

[0015] see figure 1 As shown, it is a flow chart of implementing the image noise elimination method in the optical pointing device of the present invention, the method is applied to the optical pointing device, and the optical pointing device is provided with an image sensor array, and the image sensor array samples an external frame image and Output a pixel matrix corresponding to the image sensor array, the method includes the steps of:

[0016] (1) According to the preset window width W, W is an odd number greater than 1, taking any pixel of the pixel matrix as the center, extending (W-1) / 2 pixels to both sides along the row or column to form the pixel Corresponding row pixel group and column pixel group; for example, if W=5, take a selected pixel as the center, select two pixels to the right in the row direction, and select two pixels to the left, so there are 5 pixels in total , and these 5 pixels are called the row pixel group of the pixel. Similarly, for a column pixe...

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Abstract

The present invention discloses an image noise elimination method in an optical indicating device. The optical indicating device is provided with an image sensor array. The image sensor array samples an outer frame of image and outputs a pixel matrix which corresponds with the image sensor array. The method comprises the following steps: (1) forming a line pixel set and a row pixel set which correspond with the pixel according to a preset window width W around a random pixel of a pixel matrix after extending (W-1) / 2 pixels to two sides along a line or row direction; (2) calculating weighting average values L and C of the line pixel set and the column pixel set of each pixel Y0; (3) acquiring a weighting average value M of pixel values of all pixels of the line and the row which correspond with each pixel, wherein: M=a*L+b*C, wherein a and b are weighting coefficients; and (4) acquiring the pixel value of each pixel after nose elimination, and forming a new pixel matrix wherein.

Description

【Technical field】 [0001] The invention relates to an image noise elimination method, in particular to an image noise elimination method in an optical indicating device. 【Background technique】 [0002] In today's CMOS image sensors, how to eliminate the FPN (Fixed Pattern Noise: fixed pattern noise) noise of image pixels is always a difficult problem that designers need to solve. The FPN of the image pixel includes not only the column FPN of the pixel array, but also the row FPN of the pixel array. The main factors that form the FPN include: the mismatch between the pixel circuit and the related read amplifier circuit, the noise introduced by the disturbance of the power supply, and the like. [0003] In order to eliminate the FPN in the image sensor, there have been three types of solutions in the prior art. One is the CDS (correlated Double Sampling: correlated double sampling) method. US Patent No. 6,538,695 B1 representing the CDS method discloses a method for calibrat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/357H04N5/367H04N5/374
Inventor 刘建谢承华
Owner 益海芯电子技术江苏有限公司