This is my practical Bachelor's project from 2014. It's an implementation of a raw processing pipeline to process .cr2-Files (raw files from Canon DSLRs) and render them viewable. the processing can be done step by step with custom parameters to fully understand each processing step. The following steps are implemented:
- Cropping of border pixels
- Black level subtraction and normalization
- Demosaicing
- Color space transformation
- Application of LUTs, which are generated from a curves panel
- Noise reduction
- Compensation sharpening
- Export as .tiff file
In addition to that there is functionality to flat stitch raw files, which were captured via a shift lens (TS- or PC-lenses), and export them as .dngs. So it's possible to preserve the 'raw' nature of the files, altough they were already stitched together, which has certain benefits. Stitching is done in native code, which is called with the use of the Java Native Interface. The raw processing pipeline is implemented in pure Java and follows the MVC architecture.
##Attention
RawProcessor needs a patched Version of LibTiff 4.0.3, which is used to write .tif and .dng files. For more info see: http://www.cybercom.net/~dcoffin/dcraw/libtiff.patch https://github.com/ncsuarc/tiffutils/blob/master/libtiff-4.0.3.patch
The patch should look like this: Add support for CFA pattern tags in TIFF images. This allows creating DNG images with a custom bayer pattern.
libtiff/tif_dirinfo.c | 2 ++ libtiff/tiff.h | 3 +++ 2 files changed, 5 insertions(+)
diff --git a/libtiff/tif_dirinfo.c b/libtiff/tif_dirinfo.c index d319931..3432925 100644 --- a/libtiff/tif_dirinfo.c +++ b/libtiff/tif_dirinfo.c @@ -128,6 +128,8 @@ tiffFields[] = { { TIFFTAG_PIXAR_FOVCOT, 1, 1, TIFF_FLOAT, 0, TIFF_SETGET_FLOAT, TIFF_SETGET_UNDEFINED, FIELD_CUSTOM, 1, 0, "FieldOfViewCotangent", NULL }, { TIFFTAG_PIXAR_MATRIX_WORLDTOSCREEN, 16, 16, TIFF_FLOAT, 0, TIFF_SETGET_C0_FLOAT, TIFF_SETGET_UNDEFINED, FIELD_CUSTOM, 1, 0, "MatrixWorldToScreen", NULL }, { TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA, 16, 16, TIFF_FLOAT, 0, TIFF_SETGET_C0_FLOAT, TIFF_SETGET_UNDEFINED, FIELD_CUSTOM, 1, 0, "MatrixWorldToCamera", NULL },
- { TIFFTAG_CFAREPEATPATTERNDIM, 2, 2, TIFF_SHORT, 0, TIFF_SETGET_C0_UINT16, TIFF_SETGET_UNDEFINED, FIELD_CUSTOM, 0, 0, "CFARepeatPatternDim", NULL },
- { TIFFTAG_CFAPATTERN, 4, 4, TIFF_BYTE, 0, TIFF_SETGET_C0_UINT8, TIFF_SETGET_UNDEFINED, FIELD_CUSTOM, 0, 0, "CFAPattern" , NULL}, { TIFFTAG_COPYRIGHT, -1, -1, TIFF_ASCII, 0, TIFF_SETGET_ASCII, TIFF_SETGET_UNDEFINED, FIELD_CUSTOM, 1, 0, "Copyright", NULL }, /* end Pixar tags / { TIFFTAG_RICHTIFFIPTC, -3, -3, TIFF_LONG, 0, TIFF_SETGET_C32_UINT32, TIFF_SETGET_UNDEFINED, FIELD_CUSTOM, 0, 1, "RichTIFFIPTC", NULL }, diff --git a/libtiff/tiff.h b/libtiff/tiff.h index 19b4e79..fedcdb8 100644 --- a/libtiff/tiff.h +++ b/libtiff/tiff.h @@ -201,6 +201,7 @@ typedef enum { #define PHOTOMETRIC_CIELAB 8 / !1976 CIE Lab* / #define PHOTOMETRIC_ICCLAB 9 / ICC Lab* [Adobe TIFF Technote 4] / #define PHOTOMETRIC_ITULAB 10 / ITU Lab* / +#define PHOTOMETRIC_CFA 32803 / color filter array / #define PHOTOMETRIC_LOGL 32844 / CIE Log2(L) / #define PHOTOMETRIC_LOGLUV 32845 / CIE Log2(L) (u',v') / #define TIFFTAG_THRESHHOLDING 263 / +thresholding used on data / @@ -402,6 +403,8 @@ typedef enum { #define TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA 33306 / tag 33405 is a private tag registered to Eastman Kodak / #define TIFFTAG_WRITERSERIALNUMBER 33405 / device serial number / +#define TIFFTAG_CFAREPEATPATTERNDIM 33421 / dimensions of CFA pattern / +#define TIFFTAG_CFAPATTERN 33422 / color filter array pattern / / tag 33432 is listed in the 6.0 spec w/ unknown ownership / #define TIFFTAG_COPYRIGHT 33432 / copyright string / / IPTC TAG from RichTIFF specifications */ --