发明名称 |
Lossy compression of high-dynamic range image files |
摘要 |
A high dynamic range (HDR) image can be lossy compressed by first mapping floating point image data values of the HDR image from a light linear space to a perceptually linear space using a first non-linear mapping function. A value in the light linear space is proportionate to the power of a light source, and a value in the perceptually linear space is proportionate to a visual perceived brightness. Floating point discrete cosine transform (DCT) frequency coefficients of the floating point image data values of the HDR image are determined. The floating point DCT frequency coefficients are quantized. The quantized floating point DCT frequency coefficients are compressed. The compression of the quantized floating point DCT frequency coefficients is lossless. The compressed quantized floating point DCT frequency coefficients are stored.
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申请公布号 |
US8340442(B1) |
申请公布日期 |
2012.12.25 |
申请号 |
US20100705348 |
申请日期 |
2010.02.12 |
申请人 |
RASCHE KARL RICHARD;PACIFIC DATA IMAGES LLC |
发明人 |
RASCHE KARL RICHARD |
分类号 |
G06K9/36;G06K9/40;G06K9/46 |
主分类号 |
G06K9/36 |
代理机构 |
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