Modulation Transfer Function(MTF) is an important imaging quality indicator of optical system, in order to evaluate the
imaging quality for a space remote sensing TDICCD camera, the MTF testing system,including hardware components
and software components, was established based on refocusing system. Firstly, the design of Three Mirror Anastigmatic
(TMA) optical system and the long interlace assemble TDICCD focal plane were introduced. Secondly, the construction
and the schematic diagram of the refocusing system was presented in detail, as well as the relationship between
refocusing range and position encoder for interlace assemble TDICCD focal plane. Thirdly, the schematic diagram of the
MTF testing system was given, and the relationship between MTF and contrast transfer function(CTF) was discussed.
Finally, on the basis of the schematic diagram of CTF, the transfer process of a square wave target was investigated. The
testing results indicate that the MTF testing system can measure the CTF of every TDICCD on the focal plane in the
focusing range, which meet the requirement of evaluation of imaging quality for a space TDICCD camera.
In order to improve the efficiency of remote sensing image data storage and transmission we present a method of the
image compression based on lifting scheme and modified SPIHT(set partitioning in hierarchical trees) by the design of
FPGA program, which realized to improve SPIHT and enhance the wavelet transform image compression. The lifting
Discrete Wavelet Transform (DWT) architecture has been selected for exploiting the correlation among the image pixels.
In addition, we provide a study on what storage elements are required for the wavelet coefficients. We present lena’s
image using the 3/5 lifting scheme.
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