Compression of NOAA/AVHRR data with a wavelet transform
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چکیده
An attempt has been made to assess the e ciency of image data compression by wavelet transform encoding using National Oceanic and Atmospheric Administration (NOAA) Advanced Very High Resolution Radiometer (AVHRR) images. Raw and derived images were compressed to various levels and a number of parameters in the decompressed images compared with those obtained using raw data as a yardstick against which to measure the loss of information due to compression. Unsupervised classi cation, Normalized Di erenceVegetation Index (NDVI) values and brightness temperatures appeared to su er little degradation and only for fractal dimensions was there signi cant loss of integrity at compressionrates of up to a factor of 32. The general conclusion from a visual inspection of the e ect of such compressions on arti cially generated geometrical imagettes con rms the e ectiveness of this method of compression.
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تاریخ انتشار 2000