The control method of the exposure time of the line array and its system

A technology of exposure time and line scan camera, which can be applied to parts of TV systems, parts of color TVs, TVs, etc., and can solve problems such as uneven gray value of images.

Inactive Publication Date: 2016-08-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The present invention overcomes the deficiencies of the prior art, and provides a control system and method for the exposure time of a line-scan camera, which is used to solve the problem that the gray value of the image may be uneven due to the frequency change of the external trigger signal of the line-scan camera technical issues

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  • The control method of the exposure time of the line array and its system
  • The control method of the exposure time of the line array and its system
  • The control method of the exposure time of the line array and its system

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[0029] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0030] This embodiment deeply analyzes the reason why the external trigger signal affects the image quality of the CIS line scan camera under the condition of variable line frequency, and proposes a new CIS exposure control method—the second trigger method. This method does not require complex algorithms and subsequent image processing. By improving the control timing, the exposure time of each line of the linear array CIS can be kept constant, thereby eliminating the impact of changing line frequency on image quality. The experimental results show that, in the case of external trigger frequency changes, the fluctuation range of the gray value of the image collected by the second trigger method is 75% smaller than that of the first trigger method, and a long line array camera with a width of 1.6 meters is pr...

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Abstract

The invention discloses a method and system for controlling the exposure time of a line array camera, comprising an FPGA and a contact image sensor; the FPGA is used to receive an external trigger signal, and after receiving the external trigger signal, the FPGA generates a For exposure, the first signal does not receive output data from a contact image sensor; and the FPGA also generates a second signal that does not perform exposure and is only used to control the reception of output data from the contact image sensor. In the case of triggering line frequency changes, using the method and its system can obtain a scanned image with uniform gray value and high quality, which is of great significance for improving the image quality of the machine vision inspection industry.

Description

technical field [0001] The invention relates to the field of image imaging technology, in particular to a method and system for controlling the exposure time of a line-scan camera. Background technique [0002] The contact image sensor CIS (contact image sensor) has the characteristics of simple structure, small size, low cost, and convenient use. It has been widely used in portable scanning, bill identification, industrial inspection and other fields. As an important parameter, exposure time directly affects the quality of the image, and the quality of the image directly determines the performance of the scanning device. Therefore, the control of the exposure time becomes the key point and difficulty in the design of the scanning device. The external trigger CIS line scan camera used in general industrial inspection has a relatively fixed acquisition background and a fixed trigger frequency. Usually, a constant exposure time can be used to obtain a uniform image. However, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/202H04N5/235
Inventor 刘霖倪光明黄炳权唐雪松宋昀岑刘娟秀杨先明陈镇龙罗颖
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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