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Method for correcting gray-level linear array scanning image

A technology of line scanning and scanning images, applied in the direction of image communication, electrical components, etc., can solve the problems of difficult development and high cost, and achieve the effect of reducing the difficulty of implementation, avoiding delay, and eliminating light and dark stripes.

Active Publication Date: 2012-05-16
CAS OF CHENGDU INFORMATION TECH CO LTD
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  • Application Information

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Problems solved by technology

This method is costly and difficult to develop, and is not suitable for low-cost high-speed scanners

Method used

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  • Method for correcting gray-level linear array scanning image
  • Method for correcting gray-level linear array scanning image
  • Method for correcting gray-level linear array scanning image

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Embodiment Construction

[0020] A correction method for a grayscale line scan image, such as image 3 shown, including the following steps:

[0021] The first step is to scan a piece of white paper to obtain the initial scanned image (with alternate light and dark stripes), let the initial scanned image of the i-th sensor in the j-th row be ;

[0022] The second step, the initial scanned image obtained by scanning the white paper , calculate the correction factor for each point:

[0023] Assume (i: i-th sensor), where:

[0024] : Actual signal output by each sensor

[0025] : ideal signal output by each sensor

[0026] : Noise signal output by each sensor.

[0027] According to the physical characteristics of each sensor, the actual output signal of the sensor is ideally signaled by it and noise signal constitute. Therefore, by the formula , to get the ideal signal . because It is relatively fixed for a specific sensor, so it is only necessary to ask for it to synthesi...

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Abstract

The invention discloses a method for correcting a gray-level linear array scanning image, comprising the following steps of: firstly scanning white paper to obtain an initial scanning image; then calculating the correction factor of each sensor by utilizing software on a computer on the basis of the initial scanning image; and adding the digital signal of an A / D-converted real-time scanning imageto the correction factor corresponding to the point by using an adder to obtain the value of the corrected pixel point. The method has the advantages that because the method comprises the steps of firstly calculating the correction factor by utilizing the software on the computer according to the initial scanning image obtained by scanning the white paper, then preposing and applying the correction factor by utilizing special hardware, sending the calculated correction factor to the adder by using the software and then performing a simple point-by-point addition operation by using the adder to accomplish image correction, the method reduces the realization difficulty of the hardware and also avoids the time delay caused by software correction. The original light and dark stripes of the corrected image are eliminated so that the corrected image is more uniform and truer.

Description

technical field [0001] The invention relates to a method for correcting a grayscale scanned image, in particular to a method for correcting a grayscale image scanned by a plane line array. Background technique [0002] Planar image acquisition is widely used in industrial production, commercial activities and daily life. It is usually divided into two methods: area array and line array. Area array images are generally acquired by cameras or video cameras, which have the characteristics of high speed and low cost, but they often have defects of edge deformation or overall distortion, and cannot be directly used for high-precision image processing. Linear array scanning, such as flatbed scanners, can obtain high-precision flat images, and there is almost no problem of image deformation. It can be directly applied to image processing fields with strict quality requirements, such as online quality inspection on the production line, ballot statistics, financial Bill processing, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/028H04N1/04
Inventor 崔喆彭程王波黄玉娟史志明李永华张宇官磊郭坚巫浩
Owner CAS OF CHENGDU INFORMATION TECH CO LTD
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