Detail Enhancement Technology of Aerial Photogrammetric Image for River Band Topographic Survey
Aerial photography exposure delay causes error interference to the measured image,resulting in low image contrast and clarity.To solve this problem,the image detail enhancement technology based on sub-layer segmentation and transmittance defogging was proposed.By fully considering the system error that was linear with the aerial photogrammetry time in the integrated monitoring,the dynamic differential post-processing technology was adopted to solve the error interference caused by exposure delay and signal interruption.Sub-level segmentation was carried out for each gray area of the image,and the proportion of the sub-level area in the global histogram was reflected on the abscissa of the gray level to enhance the image contrast.The atmospheric transmission model was built to calculate the dark primary color of the channel in the local image block of the fog-free image,and enhance the image definition in combination with the local transmittance calculation results of the aerial image.According to the experimental results,the maximum pixel value of this technology was 1000 PX,which appeared in the middle region.The image detail enhancement effect was consistent with the ideal enhancement effect,and could effectively enhance the image details.
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