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Merge pull request #19540 from asmorkalov:as/openexr_comression_options

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OpenEXR compression options

* Adding possibility to select the compression type for the OpenEXR format.

There are compression modes other than the default that are more suited for certain data. Mainly grainy/noisy data.

* Code review fixes.

Co-authored-by: Daniel Rydstrom <daniel.rydstrom@sick.se>
This commit is contained in:
Alexander Smorkalov
2021-02-20 19:28:08 +03:00
committed by GitHub
parent ca7518c13b
commit c131c12fd7
3 changed files with 90 additions and 1 deletions
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modules/imgcodecs/include/opencv2/imgcodecs.hpp
+14
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@@ -95,6 +95,7 @@ enum ImwriteFlags {
IMWRITE_PNG_BILEVEL = 18, //!< Binary level PNG, 0 or 1, default is 0.
IMWRITE_PXM_BINARY = 32, //!< For PPM, PGM, or PBM, it can be a binary format flag, 0 or 1. Default value is 1.
IMWRITE_EXR_TYPE = (3 << 4) + 0, /* 48 */ //!< override EXR storage type (FLOAT (FP32) is default)
IMWRITE_EXR_COMPRESSION = (3 << 4) + 1, /* 49 */ //!< override EXR compression type (ZIP_COMPRESSION = 3 is default)
IMWRITE_WEBP_QUALITY = 64, //!< For WEBP, it can be a quality from 1 to 100 (the higher is the better). By default (without any parameter) and for quality above 100 the lossless compression is used.
IMWRITE_PAM_TUPLETYPE = 128,//!< For PAM, sets the TUPLETYPE field to the corresponding string value that is defined for the format
IMWRITE_TIFF_RESUNIT = 256,//!< For TIFF, use to specify which DPI resolution unit to set; see libtiff documentation for valid values
@@ -110,6 +111,19 @@ enum ImwriteEXRTypeFlags {
IMWRITE_EXR_TYPE_FLOAT = 2 //!< store as FP32 (default)
};
enum ImwriteEXRCompressionFlags {
IMWRITE_EXR_COMPRESSION_NO = 0, //!< no compression
IMWRITE_EXR_COMPRESSION_RLE = 1, //!< run length encoding
IMWRITE_EXR_COMPRESSION_ZIPS = 2, //!< zlib compression, one scan line at a time
IMWRITE_EXR_COMPRESSION_ZIP = 3, //!< zlib compression, in blocks of 16 scan lines
IMWRITE_EXR_COMPRESSION_PIZ = 4, //!< piz-based wavelet compression
IMWRITE_EXR_COMPRESSION_PXR24 = 5, //!< lossy 24-bit float compression
IMWRITE_EXR_COMPRESSION_B44 = 6, //!< lossy 4-by-4 pixel block compression, fixed compression rate
IMWRITE_EXR_COMPRESSION_B44A = 7, //!< lossy 4-by-4 pixel block compression, flat fields are compressed more
IMWRITE_EXR_COMPRESSION_DWAA = 8, //!< lossy DCT based compression, in blocks of 32 scanlines. More efficient for partial buffer access.
IMWRITE_EXR_COMPRESSION_DWAB = 9, //!< lossy DCT based compression, in blocks of 256 scanlines. More efficient space wise and faster to decode full frames than DWAA_COMPRESSION.
};
//! Imwrite PNG specific flags used to tune the compression algorithm.
/** These flags will be modify the way of PNG image compression and will be passed to the underlying zlib processing stage.