Digital compensation method and system for outputting scientific CCD video signals at high speed

A video signal and digital compensation technology, applied in the field of hyperspectral imaging, can solve the problems that the equivalent CCD readout circuit is too simple, and the correction accuracy cannot be guaranteed.

Active Publication Date: 2021-03-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

This method does not provide a test method for different light intensity conditions, and the equivalent CCD readout circuit using the first-order system is too simple, and the calibration accuracy cannot be guaranteed

Method used

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  • Digital compensation method and system for outputting scientific CCD video signals at high speed
  • Digital compensation method and system for outputting scientific CCD video signals at high speed
  • Digital compensation method and system for outputting scientific CCD video signals at high speed

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Embodiment 2

[0152] At the same time, the structure of the CCD readout circuit can also be ignored in the actual implementation, and the correction coefficient can be obtained directly according to the verification method described in Section 2-4. The coefficients obtained by this method are only suitable for a specific readout rate, and changing the output rate requires recalibration of the experiment. Specific steps are as follows:

[0153] 1) Quantify the brightness of the light source according to the method described in section 2, and the result is A' 0 , A' 1 ,..., A' N ;

[0154] 2) Adjust the brightness of the light source to A' 0 , set the CCD imaging circuit to the slow readout mode, and calculate the average value of the effective pixel value, denoted as P′ 0 ;

[0155] 3) Set the CCD imaging circuit as high-speed output, and the rate is F;

[0156] 4) Find the average value of the effective pixel pixel value, denoted as P″ 0 ;

[0157] 5) Get the correction coefficient...

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Abstract

The invention relates to a digital compensation method and system for outputting scientific CCD video signals at a high speed, and the method comprises the steps: firstly deducing an equivalent circuit model of a CCD reading circuit at a charge transfer stage based on the CCD principle and an internal circuit schematic diagram, and determining the parameters of the equivalent circuit model by adopting an experiment calibration method based on the equivalent circuit model; determining a calibration scheme according to the equivalent circuit model with determined parameters, obtaining a compensation coefficient list of the CCD imaging system under different light intensity conditions through experimental calibration, and designing a light intensity quantification method according to the noise level of the CCD imaging system; and when the reading frequency is changed, enabling a compensation coefficient list corresponding to the reading frequency to only need to be derived according to the equivalent circuit model. According to the invention, the CCD pixel numerical attenuation problem caused by reading clock frequency increase can be compensated, and a clear light intensity quantification method, a correction coefficient derivation method and a numerical verification method are simple and efficient and have very high compensation accuracy.

Description

technical field [0001] The invention relates to the technical field of hyperspectral imaging, in particular to a digital compensation method and system for outputting scientific grade CCD video signals at high speed. Background technique [0002] The shot noise of the charge-coupled device (CCD) determines the upper limit of the signal-to-noise ratio of the imaging circuit, and the shot noise depends on the number of charges in the full well of the CCD. Therefore, in order to improve the signal-to-noise ratio of the imaging system, it is necessary to use a CCD with a deep potential well. Scientific-grade CCDs usually have a deep potential well, which is limited by the bandwidth of the readout circuit. This kind of CCD usually uses a slow readout method to output CCD video signals. However, in some occasions, such as the digital pixel merging method used in the spaceborne differential absorption spectrometer (EMI), it is necessary to output the CCD video signal quickly, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/357H04N5/372H04N5/378
CPCH04N25/616H04N25/71H04N25/75Y02E60/00
Inventor 常振
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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