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—It has to be aware that remote sensing images need to be encoded onboard using lossless compression method if all information of the image is required to be fully conserved for ground use. Also, to acquire as much onboard data as possible during one available pass of the satellite, it is necessary to consider efficiency of onboard data compression and(More)
In order to improve data transmission efficiency between ground and satellite, image compression methods have been implemented onboard for years. However, the thermal noise generated by charge-coupled device (CCD) will decrease the compression ratio of the onboard image data and there is few works to be undertaken on noise suppression oriented for(More)
—After operating on orbit for certain periods, natural degradation of CCD will result in the issue that the image SNR begins to apparently decreasing. To increase image SNR, one of the feasible ways is to increase CCD integration time. However, more Gaussian-like thermal noise, which could blur the image and even decrease the compression ratio of onboard(More)
Luminance and contrast of satellite images are largely determined by exposure status of the onboard camera. Only with appropriate exposure level can the output Digital Numbers(DN) be contained within the dynamic range of the camera and be distributed as evenly as possible, thus acquiring images can retain the most information details. With a higher exposure(More)
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