Method for achieving high-dynamic-range imaging of refrigeration type infrared thermal imager
An infrared thermal imager, high dynamic range technology, applied in the direction of image communication, color TV components, TV system components, etc., can solve the problem that the infrared thermal imager has a low dynamic range and cannot complete the scene with a large temperature range Clear imaging and other issues, to achieve the effect of improving imaging dynamic range, improving signal-to-noise ratio and sensitivity, and good imaging effect
Active Publication Date: 2019-04-19
NANJING UNIV OF SCI & TECH
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[0005] The purpose of the present invention is to provide a method for realizing high dynamic range imaging of a cooling type infrared thermal imager, which overcomes the shortcomings of a low dynamic range of an infrared thermal imager and cannot completely and clearly image scenes with a large temperature range, and at the same time improves the infrared The signal-to-noise ratio of the output signal of the external imaging system,
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Embodiment 1
[0044] It adopts an input image with a resolution of 320×256 and a bit width of 14 bits. The FPGA model used is 5CEFA5C19I7, and the refrigerated thermal imaging camera is MARS-LW-RM3 of SOFRADIR. The clock frequency for the detector is 6MHz, one frame of image is output every 30,000 clocks, and the detector uses four-channel output.
[0045] The integration time parameters are 10μs, 200μs and the combination of eight different integration time parameters are used for three imaging, and the final images obtained under different integration time conditions are collected, and the results are as follows figure 2 As shown in (a), (b) and (c), it can be seen from the image that there is a soldering iron with a high temperature object in the observed scene. When the integration time is short, the soldering iron tip is not saturated, and you can see the relevant details, but the text next to it is blurred, the contrast is low, and cannot be clearly distinguished; when the integration t...
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The invention discloses a method for achieving high-dynamic-range imaging of a refrigeration type infrared thermal imager. Firstly, for images output by the refrigeration type infrared thermal imager,8 frames of the images are taken as a cycle, and then all the frames of the obtained images pass through a non-uniformity correction module to obtain corrected images; secondly, the corrected imagespass through a divider with a divisor of 8, and numerical values of the images are changed to one eighth of original values; thirdly, all the images, in each cycle, passing through the divider are summated and stored in LPDDR2, and after accumulation of the 8 frames of the images in the same cycle is completed, re-accumulation of the next cycle is started; and finally, when the first frame of theimage and the fifth frame of the image of the same cycle come, image reading in the LPDDR2 is carried out and the images are transmitted to a subsequent image processing module, and finally video images are output. The adaptability of the infrared thermal imager to a scene with a large temperature variation range is effectively expanded; more scene information can be obtained; and the applicationfield of the infrared thermal imager is expanded.
Description
Technical field [0001] The invention belongs to the field of infrared image processing, in particular to a method for realizing high dynamic range imaging of a refrigerated infrared thermal imager. Background technique [0002] The original image generated by the thermal imaging camera has a narrow dynamic range and concentrated grayscale. Due to the limited charge storage of the integration capacitor of the readout circuit in the focal plane detector assembly, the integration time of the detector is limited. When the high temperature object in the scene is clearly seen, the low temperature object may have been submerged by noise, and when the low temperature object is clearly seen At that time, the high-temperature objects are already saturated. [0003] Austin et al. first proposed the concept of infrared image superframe technology. Infrared image superframe technology refers to acquiring multiple frames of images within the single frame imaging time specified by the infrared ...
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IPC IPC(8): H04N5/33H04N5/217H04N5/235
CPCH04N5/33H04N25/63H04N23/741
Inventor 隋修宝刘博文王利平陈钱顾国华朱亮亮于雪莲刘郭新匡小冬蒋桐
Owner NANJING UNIV OF SCI & TECH