A Noise Suppression Method for Image Fixed Pattern Based on Noise Template

A technology of fixed pattern noise and template, applied in the direction of image communication, color TV parts, TV system parts, etc., can solve the problem of ignoring the difference of a single pixel, improve the image quality, the calculation method is simple, and the calculation time short effect

Inactive Publication Date: 2017-02-22
杭州吉瑞邦智能科技有限公司
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Problems solved by technology

[0006] The present invention provides a method for suppressing image fixed-pattern noise based on a noise template, which mainly solves the problem of suppressing fixed-pattern noise existing in the prior art. Technical issues with differences between individual pixels within an area

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  • A Noise Suppression Method for Image Fixed Pattern Based on Noise Template

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Embodiment

[0022] Embodiment: a kind of suppression method of image fixed pattern noise based on noise template of this example, such as figure 1 , the steps are:

[0023] a. Place the image sensor in a temperature-controlled box, use an optical integrating sphere to uniformly illuminate the image sensor, and record the response of each photosensitive pixel unit as the fixed pattern noise template of the sensor at this temperature;

[0024] b. Adjust the temperature of the temperature control box, and record and save the fixed pattern noise template N of the image sensor every 10°C within the temperature range of -40°C to +80°C 0 (x, y, t), where x, y are the horizontal and vertical pixel coordinates of the image respectively, and t is the sensor temperature. For an image of 384×288 pixels, the range of x is 1~384, and the change of y The range is 1~288;

[0025] c. When the sensor collects images, the current sensor temperature is +23°C, and the fixed pattern noise templates at +20...

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Abstract

The invention relates to a digital image processing technology, in particular to a method for suppressing image fixed-pattern noise based on a noise template. The method mainly solves the technical problems that in the fixed-pattern noise suppressing process in the prior art, the integral correction is only carried out by aiming at a pixel column or a pixel block, and the differences among single pixels in the region are ignored. According to the method, the noise template of an image sensor is obtained through pre-collection; and after the sensor obtains the image, the template is utilized for performing real-time matching on the image noise, so the relevancy between image information after noise background removal and the noise template reaches the minimum.

Description

technical field [0001] The invention relates to a digital image processing technology, in particular to a method for suppressing image fixed pattern noise based on a noise template. Background technique [0002] Noise is an important factor affecting the imaging quality of photosensitive elements. The acquisition of images needs to go through processes such as optical signal acquisition, photoelectric conversion, electrical signal amplification, readout, and analog-to-digital conversion (A / D conversion). Due to the advanced manufacturing process, there are differences between the photosensitive pixel units of the image sensor, and this difference forms the fixed pattern noise (FPN, fixed pattern noise) of the image. [0003] FPN widely exists in CMOS image sensors, suppressing FPN noise usually adopts ordinary double-sampling technology, that is, eliminates FPN noise through the differential action of the column differential amplifier and the output differential amplifier in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/357H04N5/365
Inventor 傅兴海
Owner 杭州吉瑞邦智能科技有限公司
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