Imagemagick Facedetect

Facedetect Imagemagick

Just working on adapting Facedetect/Imagemagick to paste a head onto a body. This can be used to for example set up accurate compositing of images.

Code:

#the first part takes the body jpg files in a directory; facedetect in a for loop and detects the faces using facedetect (which is a command). Then a while loop goes through and adds a smileface.png to the body jpgs.

for file in facedetect/*.jpg; do

name=$(basename "$file")

i=0

facedetect  "$file" | while read -r x y w h; do

convert   "$file" smileface.png -geometry "${w}x${h}+${x}+${y}"

-composite "faces/${name%.*}_${i}.${name##*.}"

i=$((i+1))

done

done

Example:

The examples used here are simple bodies of professionals and the head to add is a smiley face. Here is the original result:

Problem:

This looks quite good, but the smiley needs to totally cover the original head.

First solution:

Add +400 to w and h on the dimensions: "${w+400}x${h+400}+${x}+${y}"
Result (offcenter)

Problem:

This appears to be because the h and w only keeps the top left corner of the png in place and enlarges it towards the bottom right
Possible solution: To add a -200 to the x and y coordinates to compensate "${w+400}x${h+400}+${x-200}+${y-200}"
Result no discernible change:

Original images:

Suggestion from helpful coder:

xul=255

yul=175

xc=`convert smiley.png +repage -format "%[fx:$xul + w/2]\n" info:`

yc=`convert smiley.png +repage -format "%[fx:$yul + h/2]\n" info:`

offx=`convert actor.jpg -format "%[fx:$xc-w/2]\n" info:`

offy=`convert actor.jpg -format "%[fx:$yc-h/2]\n" info:`

convert actor.jpg smiley.png +repage -gravity center -geometry +${offx}+${offy} -compose over -composite result1.jpg

Currently working on applying to batch though:

for file in facedetect/*.jpg; do

name=$(basename "$file")

i=0

facedetect  "$file" | while read -r x y w h; do

xc=`convert smileface.png +repage -format "%[fx:$xul + w/2]\n" info:`

yc=`convert smileface.png +repage -format "%[fx:$yul + h/2]\n" info:`

offx=`convert "$file" -format "%[fx:$xc-w/2]\n" info:`

offy=`convert "$file" -format "%[fx:$yc-h/2]\n" info:`

convert "$file" smileface.png +repage -gravity center -geometry ${w+300}x${h+300}+${offx}+${offy} -compose over -composite

"faces/${name%.*}_${i}.${name##*.}"

i=$((i+1))

done

done

Result:

convert-im6.q16: missing an image filename `-composite' @ error/convert.c/ConvertImageCommand/3260.

bash: faces/clooney_0.jpg: Permission denied

convert-im6.q16: missing an image filename `-composite' @ error/convert.c/ConvertImageCommand/3260.

bash: faces/dfsd_0.jpg: No such file or directory

convert-im6.q16: missing an image filename `-composite' @ error/convert.c/ConvertImageCommand/3260.

bash: faces/ghgh_0.jpg: No such file or directory

Second round.  This worked:

for file in facedetect/*.jpg; do

  name=$(basename "$file")

i=0

  facedetect  "$file" | while read -r x y w h; do

    xul=255

    yul=175

    xc=`convert smileface.png +repage -format "%[fx:$xul + w/2]\n" info:`

    yc=`convert smileface.png +repage -format "%[fx:$yul + h/2]\n" info:`

    offx=`convert "$file" -format "%[fx:$xc-w/2]\n" info:`

    offy=`convert "$file" -format "%[fx:$yc-h/2]\n" info:`

    convert "$file" smileface.png +repage -gravity center -geometry 300x300+${offx}+${offy} -compose over -composite "faces/${name%.*}_${i}.${name##*.}"

  i=$((i+1))

  done

done

However, some of the pictures were off center. There is clearly more to do to make this generally consistent across all jpgs being used (of different dimensions)

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