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Merge pull request #14609 from janstarzy:tiff-orientation-fix

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This commit is contained in:
Alexander Alekhin 2019-05-27 13:39:51 +00:00
commit c9b3e718db
1 changed files with 75 additions and 2 deletions
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77
modules/imgcodecs/src/grfmt_tiff.cpp
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@ -334,6 +334,77 @@ bool TiffDecoder::nextPage()
readHeader();
}
static void fixOrientationPartial(Mat &img, uint16 orientation)
{
switch(orientation) {
case ORIENTATION_RIGHTTOP:
case ORIENTATION_LEFTBOT:
flip(img, img, -1);
/* fall through */
case ORIENTATION_LEFTTOP:
case ORIENTATION_RIGHTBOT:
transpose(img, img);
break;
}
}
static void fixOrientationFull(Mat &img, int orientation)
{
switch(orientation) {
case ORIENTATION_TOPRIGHT:
flip(img, img, 1);
break;
case ORIENTATION_BOTRIGHT:
flip(img, img, -1);
break;
case ORIENTATION_BOTLEFT:
flip(img, img, 0);
break;
case ORIENTATION_LEFTTOP:
transpose(img, img);
break;
case ORIENTATION_RIGHTTOP:
transpose(img, img);
flip(img, img, 1);
break;
case ORIENTATION_RIGHTBOT:
transpose(img, img);
flip(img, img, -1);
break;
case ORIENTATION_LEFTBOT:
transpose(img, img);
flip(img, img, 0);
break;
}
}
/**
* Fix orientation defined in tag 274.
* For 8 bit some corrections are done by TIFFReadRGBAStrip/Tile already.
* Not so for 16/32/64 bit.
*/
static void fixOrientation(Mat &img, uint16 orientation, int dst_bpp)
{
switch(dst_bpp) {
case 8:
fixOrientationPartial(img, orientation);
break;
case 16:
case 32:
case 64:
fixOrientationFull(img, orientation);
break;
}
}
bool TiffDecoder::readData( Mat& img )
{
int type_ = img.type();
@ -363,10 +434,11 @@ bool TiffDecoder::readData( Mat& img )
CV_TIFF_CHECK_CALL_DEBUG(TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &ncn));
uint16 img_orientation = ORIENTATION_TOPLEFT;
CV_TIFF_CHECK_CALL_DEBUG(TIFFGetField(tif, TIFFTAG_ORIENTATION, &img_orientation));
bool vert_flip = (img_orientation == ORIENTATION_BOTRIGHT) || (img_orientation == ORIENTATION_RIGHTBOT) ||
(img_orientation == ORIENTATION_BOTLEFT) || (img_orientation == ORIENTATION_LEFTBOT);
const int bitsPerByte = 8;
int dst_bpp = (int)(img.elemSize1() * bitsPerByte);
bool vert_flip = dst_bpp == 8 &&
(img_orientation == ORIENTATION_BOTRIGHT || img_orientation == ORIENTATION_RIGHTBOT ||
img_orientation == ORIENTATION_BOTLEFT || img_orientation == ORIENTATION_LEFTBOT);
int wanted_channels = normalizeChannelsNumber(img.channels());
if (dst_bpp == 8)
@ -579,6 +651,7 @@ bool TiffDecoder::readData( Mat& img )
} // for x
} // for y
}
fixOrientation(img, img_orientation, dst_bpp);
}
if (m_hdr && depth >= CV_32F)