nom.tam.fits.compression.algorithm.quant.package-info Maven / Gradle / Ivy
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/**
*
* Quantization support for representing floating-point values with integers corresponding to discrete levels. While not
* a compression alorithm in itself (hence you might also wonder why it's in a package on its own under compression
* algorithms) quantization is nevertheless commonly used as a pre-sompression (or post-decompression step) with actual
* algorithms, especially if the algorithms are designed for integer-only data.
*
*
* Quantization is an inherently lossy process, so it will result in a lossy compression even when paired with a
* lossless compression algorithm. However, it can significantly improve compression ratios when images have limited
* dynamic range. For example a 2-byte integer quantization of double-precision values will provide 64k discrete levels
* at 1/4th of the required storage space -- even before compression is applied.
*
*
* The only class in here that users would typically interact with is
* {@link nom.tam.fits.compression.algorithm.quant.QuantizeOption} or
* {@link nom.tam.image.compression.hdu.CompressedImageHDU#getCompressOption(Class)} to set options after a quantization
* algorithm was selected for compressing an image HDU.
*
*/
package nom.tam.fits.compression.algorithm.quant;
/*-
* #%L
* nom.tam FITS library
* %%
* Copyright (C) 1996 - 2024 nom-tam-fits
* %%
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
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*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* #L%
*/