Calibration method for CCD camera imaging application

A calibration method and camera imaging technology, applied in applications, photometry, sensors, etc., can solve problems such as the inconvenience of the compensation process

Inactive Publication Date: 2009-09-16
XIDIAN UNIV
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Problems solved by technology

In the aforementioned two U.S. patents, in order to obtain different compensation factors under different exposure times, a large number of experiments are required. It is to calibrate a single image captured by the camera, which cannot be changed when the exposure time changes and the grayscale of the image pixels also changes. to calibrate
Very inconvenient in the actual compensation process

Method used

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  • Calibration method for CCD camera imaging application
  • Calibration method for CCD camera imaging application
  • Calibration method for CCD camera imaging application

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Embodiment Construction

[0036]Various details involved in the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention, rather than limiting it in any way.

[0037] figure 1 It is a schematic diagram of the system composition of the imaging application calibration process of the CCD camera 1 with the integrating sphere uniform light source system 2 described in the present invention.

[0038] like figure 1 As shown, adjust the distance between the CCD camera 1 and the integrating sphere uniform light source system 2, so that the distance between the CCD camera lens 15 and the light source outlet of the integrating sphere uniform light source system 2 is 54 mm, and make the axis of the CCD camera lens and the integrating sphere uniform light source system 2 The light source exit planes of system 2 are pe...

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Abstract

The invention provides a calibration method for CCD camera imaging application, which comprises a calibration method for the pixel-response nonuniformity of a CCD camera, and a calibration method for reversely calculating the absolute intensity of a corresponding light source by utilizing the known absolute magnitude of an integrating sphere uniform light source and the pixel gray of an image captured by the corresponding CCD camera, wherein the calibration method for pixel-response nonuniformity automatically obtains a compensation matrix of a full-width image according to the gray information of each pixel on the image, and the calibration method for absolute intensity reversely calculates the quantitative information of the functional relation of the absolute intensity of the corresponding light source through the exposure time of the image and the gray of each pixel on the image. The calibration method for pixel-response nonuniformity and the calibration method for absolute intensity can follow the changes of the exposure time of the CCD camera and the pixel gray of the image to automatically calibrate pixel-response nonuniformity and the absolute intensity of the corresponding light source according to the calibration functional relation obtained in the calibration method.

Description

technical field [0001] The invention relates to the technical fields of optical imaging technology, image processing and data analysis, and in particular to the technical field of data analysis and processing of a calibration method for optical CCD camera imaging. Background technique [0002] At present, in the imaging of CCD cameras in scientific research such as astronomy and biological imaging, it is hoped that each pixel imaged by the CCD camera is also uniformly responsive under a uniform light source, that is, the response of the pixel of the CCD camera to the same irradiance is consistent. Not only that, but also hope that the pixel grayscale imaged by the CCD camera can accurately reflect the irradiance value of the corresponding light source under a surface light source with a certain irradiance, especially in the past two years in the research of bio-optical molecular imaging. Quantitative research is needed In in vivo imaging, the changes in the level of cells i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/27G01J1/08A61B5/00
Inventor 田捷刘俊廷梁继民屈晓超赵恒秦伟张毅杨大安
Owner XIDIAN UNIV
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