Relative radiation and luminosity correcting method for optical remote sensing data of moon
A technology of relative radiation correction and optical remote sensing, which is applied in the field of remote sensing and telemetry, can solve problems such as unsatisfactory correction effect, unsatisfactory correction effect, and inability to express the diversity of lunar terrestrial terrain, so as to improve correction accuracy, reduce noise, and enhance correction effect Effect
Inactive Publication Date: 2014-09-17
NANJING UNIV
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Problems solved by technology
The uneven brightness of remote sensing images is affected by the unevenness of the detector response and the unevenness of the illumination of the light source. However, because the existing technology does not separate various influencing factors and take corrective measures in a targeted manner, the correction effect is not ideal.
In addition, in the past, the photometric correction took the moon as a whole, or only divided it into two categories: the lunar sea and the lunar land. These categories are far from expressing the diversity of the lunar terrestrial body, which also leads to unsatisfactory correction results.
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[0034] The relative radiation and photometric correction method of lunar optical remote sensing data in this embodiment takes the interferometric imaging spectroscopy (IIM) lunar optical remote sensing data carried by the "Chang'e-1" satellite as an example (the present invention is also applicable to other optical remote sensing data). The IIM data has 128 detectors for push-broom imaging along the longitude direction. Assuming that there are m rows of data in one track, the data format of the track is m rows×128 columns.
[0035] The first step, image classification
[0036] First, compare the IIM data value of each pixel of the remote sensing image of the lunar surface captured by the satellite with the FeO content threshold directly corresponding to the reflectance, and divide them into four categories with different brightness: 1) Fresh lunar land (0.5%<FeO<2.5% ) surface with high albedo; 2) surface with medium albedo for mature lunar continents (2.5%<FeO<7%); 3) surfac...
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The invention relates to a relative radiation and photometric correction method for lunar optical remote sensing data, and belongs to the technical field of remote sensing and telemetry. This method separates detector response inhomogeneity and light field inhomogeneity through image classification, image relative radiation correction, and photometric correction steps. By correcting the two separately, the left and right tonal inhomogeneity of the original image can be eliminated, and the light and dark stripes can also be corrected. Eliminate,the boundaries between tracks are invisible, thus achieving,accurate correction.
Description
technical field [0001] The invention relates to an image processing method, in particular to a relative radiation and photometric correction method for optical remote sensing data of the moon, which belongs to the technical field of remote sensing and telemetry. Background technique [0002] According to the applicant's knowledge, due to the non-uniformity of the light field (light incident angle, detector observation angle) and inconsistent response of imaging devices, the lunar remote sensing image shows brightness vignetting, light and dark stripes and other phenomena, making the same ground features have different Brightness, which affects the visibility and compositional inversion of the image. Therefore, before using remote sensing data for research, it must be corrected. The uneven brightness of remote sensing images is affected by the non-uniformity of the detector response and the non-uniformity of the illumination of the light source. However, the correction effec...
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IPC IPC(8): G01S7/497
Inventor 吴昀昭王振超周贤峰
Owner NANJING UNIV