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fixes #44

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The x/y resolutions are not computed separately anymore.
We do not check anymore if x and y resolutions are different (not
measure could anyway be taken if they were not equal...)
This commit is contained in:
fritz-hh
2014-01-06 22:23:00 +01:00
parent 8a1241ba44
commit aa4256d35c
1 changed files with 5 additions and 33 deletions
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src/ocrPage.sh
+5 -33
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@@ -41,7 +41,6 @@ FORCE_OCR="${14}" # Force to OCR, even if the page already contains fonts
# - 0: if no error occurs
# - 1: in case the page already contains fonts (which should be the case for PDF generated from scanned pages)
# - 2: in case the page contains more than one image
# - 3: in case the x,y resolutions are not equal
##################################
getImgInfo() {
local page widthPDF heightPDF curImgCharacteristics nbImg curImg propCurImg widthCurImg heightCurImg colorspaceCurImg tmpval dpi_x dpi_y epsilon dpi
@@ -78,42 +77,15 @@ getImgInfo() {
widthCurImg=`echo "$propCurImg" | cut -f1 -d" "`
heightCurImg=`echo "$propCurImg" | cut -f2 -d" "`
colorspaceCurImg=`echo "$propCurImg" | cut -f3 -d" "`
# switch height/width values if the image has not the right orientation
# we make here the assumption that vertical/horizontal dpi are equal
# we will check that later
if [ $((($heightPDF-$widthPDF)*($heightCurImg-$widthCurImg))) -lt 0 ]; then
[ $VERBOSITY -ge $LOG_DEBUG ] && echo "Page $page: Extracted image has wrong orientation. Inverting image height/width values"
tmpval=$heightCurImg
heightCurImg=$widthCurImg
widthCurImg=$tmpval
fi
[ $VERBOSITY -ge $LOG_DEBUG ] && echo "Page $page: Size ${heightCurImg}x${widthCurImg} (h*w pixel)"
# compute the resolution of the image
dpi_x=`echo "scale=5;$widthCurImg*72/$widthPDF" | bc`
dpi_y=`echo "scale=5;$heightCurImg*72/$heightPDF" | bc`
[ $VERBOSITY -ge $LOG_DEBUG ] && echo "Page $page: Size ${heightCurImg}x${widthCurImg} (in pixel)"
# round the dpi values to the nearest integer
rounded_dpi_x=`echo "scale=5;$dpi_x+0.5" | bc` # adding 0.5 is required for rounding
rounded_dpi_x=`echo "scale=0;$rounded_dpi_x/1" | bc` # round to the nearest integer
rounded_dpi_y=`echo "scale=5;$dpi_y+0.5" | bc` # adding 0.5 is required for rounding
rounded_dpi_y=`echo "scale=0;$rounded_dpi_y/1" | bc` # round to the nearest integer
# take the biggest dpi value
[ $rounded_dpi_x -ge $rounded_dpi_y ] && dpi=$rounded_dpi_x || dpi=$rounded_dpi_y
[ $VERBOSITY -ge $LOG_INFO ] && echo "Page $page: Embedded image resolution is $dpi dpi"
# compute the resolution of the image (making the assumption that x & y resolution are equal
dpi=`echo "scale=5;sqrt($widthCurImg*72*$heightCurImg*72/$widthPDF/$heightPDF)" | bc`
dpi=`echo "scale=0;$dpi/1" | bc`
# save the image characteristics
echo "$dpi $colorspaceCurImg" > $curImgCharacteristics
# check the x,y resolution difference that can be cause by:
# - the truncated PDF width/height in pt
# - the precision of dpi values computed above
epsilon=`echo "scale=5;($widthCurImg*72/$widthPDF^2)+($heightCurImg*72/$heightPDF^2)+0.00002" | bc` # max inaccuracy due to truncation of PDF size in pt
[ $VERBOSITY -ge $LOG_WARN ] && [ `echo "($dpi_x - $dpi_y) < $epsilon " | bc` -eq 0 -o `echo "($dpi_y - $dpi_x) < $epsilon " | bc` -eq 0 ] \
&& echo "Page $page: (x/y) resolution mismatch ($dpi_x/$dpi_y). Difference should be less than $epsilon. Taking biggest value" && return 3
# everything went well!
return 0
}