As a standard light source, medium and low temperature blackbody is widely used in the field of quantitative infrared remote sensing, so it is urgent to improve its calibration accuracy. This paper studies the calibration method of medium and low temperature blackbody radiation temperature based on standard transfer detector, and designs a dual channel thermal infrared transfer standard radiometer. The radiometer adopts optical path structure with achromatic off-axis reflection, its optical mechanical system is placed in liquid nitrogen refrigeration vacuum Dewar, and an optical chopper is used to improve the systematic noise ratio. Finally, through the correction experiment of commercial blackbody radiation temperature, we found that there is a certain deviation at different temperature points, and its maximum value is 3.22k. The results prove the effectiveness of the design.
In order to reduce human interaction and the workload, a method using a color phase-shifting wedge grating array is proposed for accurate camera calibration, which needs only one frame at each pose. Firstly, the zero-phase points are roughly extracted by edge detection algorithm and optimized by windowed bicubic fitting with sub-pixel accuracy. Secondly, a simple linear fitting algorithm is used to obtain zero-phase lines and acquiring their intersection points. Finally, the intersection points coinciding with circle-centers are regarded as feature points to calibrate the camera. The effectiveness and accuracy of the method is verified by experiments with real images even under color-coupling. It is shown that our method is accurate and reliable comparing with the checkerboard.
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