How to write the dimensions and position of each form?

Question

I have the input image beloe for which I´d like to get the size and coordinates and write inside or at the top of each rectangle.

For now I was able to get the black rectangles data with this script

$ convert input.png -fill black +opaque '#FFFFFF' \
-define connected-components:verbose=true \
-define connected-components:area-threshold=5000 \
-define connected-components:mean-color=true \
-connected-components 4 output.png | awk '/srgb\(0,0,0\)/{print $2}'
450x338+25+1240
294x292+13+235
190x403+301+540
246x249+16+738
294x196+16+22
292x196+15+1013
163x267+325+22
248x176+14+540
163x207+321+310
159x200+320+1009

How to put inside or above of each rectangle (in input or output image) the corresponding WxH+X+Y text?

For example like this:

Answer 1

So based upon your comment, what you want to do in Imagemagick is the following with the input on the desktop. Note that you just need the X and Y offsets from the bbox as the argument to +X+Y in -annotate.

Input:

cd
cd desktop
bboxArr=(`convert images.jpg \
-fuzz 5% -fill none -draw "color 0,0 floodfill" \
-channel rgba -fill white +opaque none -fill black +opaque white \
-type bilevel \
-define connected-components:verbose=true \
-define connected-components:area-threshold=5000 \
-define connected-components:mean-color=true \
-connected-components 8 cleaned.png | grep "gray(255)" | awk '{print $2}'`)
num=${#bboxArr[*]}
echo $num
convert images.jpg tmp.png
for ((i=0; i<num; i++)); do
bbox=${bboxArr[$i]}
echo $bbox
ww=`echo $bbox | tr "x" "+" | cut -d+ -f1`
hh=`echo $bbox | tr "x" "+" | cut -d+ -f2`
xo=`echo $bbox | tr "x" "+" | cut -d+ -f3`
yo=`echo $bbox | tr "x" "+" | cut -d+ -f4`
xo=$((xo+10))
yo=$((yo+10))
convert tmp.png \
-gravity northwest -pointsize 14 -font arial-bold -fill white \
-undercolor black -annotate +${xo}+${yo} "$bbox" tmp.png
done
convert tmp.png images_labeled.jpg
rm -f cleaned.png tmp.png