Method and system for eliminating column noise of CMOS image sensor in nuclear environment
An image sensor and environmental image technology, applied in image communication, components of TV systems, components of color TVs, etc., can solve the problem that the radiation resistance performance of memory chips cannot reach long-term use, and achieve anti-interference ability. Strong, eliminate column noise, reduce the effect of data volume
Active Publication Date: 2021-03-26
BEIJING MXTRONICS CORP +1
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However, the radiation resistance of memory chips in a nuclear environment cannot meet the requirements for long-term use, and this method cannot be used in a nuclear environment
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments disclosed in the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0036] like figure 1 , in the present embodiment, the method for eliminating the column noise of the CMOS image sensor in the nuclear environment includes:
[0037] Step 101, constructing a core environment and a non-core environment;
[0038] Step 102, placing the radiation-resistant camera in the nuclear environment.
[0039] In this embodiment, the radiation-resistant camera may specifically include: a radiation-resistant CMOS image sensor, an FPGA chip, a DA chip, a differential line conversion chip, a zoom lens, and a socket. That is, the radiation-resistant camera does not use FPGA loading chips and storage chips.
[0040] Preferably, FPGA chip can be connected with CMOS image sensor, zoom lens and DA chip respectively; FPGA chi...
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The invention discloses a method and system for eliminating column noise of a CMOS image sensor in a nuclear environment, and the method comprises the steps: collecting dark field noise to a control end of a monitoring upper computer based on the remote reconfiguration of an RS422 bus, recalculating the column noise after irradiation change, and carrying out the remote configuration of an FPGA loading file generated after the elimination of new column noise, so that the image quality of the camera is not deteriorated due to the extension of the irradiation time. According to the method, acquisition of dark field noise of the CMOS image sensor and reconfiguration of the FPGA can be completed through the RS422 bus, the implementation method is simple, the problem that equipment cannot be updated in a nuclear environment is solved, and the service cycle of monitoring equipment is prolonged; and the column noise of the image can be calculated without an additional storage chip, so the costis reduced, and the reliability of the equipment is improved.
Description
technical field [0001] The invention belongs to the technical field of nuclear environment monitoring, and in particular relates to a method and system for eliminating noise of a CMOS image sensor column in a nuclear environment. Background technique [0002] The column fixed pattern noise CFPN (Column Fixed Pattern Noise) of CMOS image sensor is mainly caused by the threshold voltage of the internal transistor of the column amplifier of different columns and its own bias voltage. . Human eyes are more sensitive to CFPN, so how to eliminate CFPN in the image acquisition system has become an important subject of research. [0003] At present, most image acquisition systems use algorithms such as median filtering and neighborhood mean filtering to eliminate CFPN in the system. Such methods require the integration of memory chips in the system to enable real-time computation of algorithms. However, the radiation resistance of memory chips in a nuclear environment cannot meet...
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IPC IPC(8): H04N5/365H04N5/217
CPCH04N25/60H04N25/677
Inventor 崔靳陆振林陈雷任永正刘薇雷红萍李想高冉冉
Owner BEIJING MXTRONICS CORP