Convert image magick command to magick++ c++ code

Question

I'm working on an image preprocessing project in my university and used an image magick script to clean image background.Now I want to get the same output through Magick++ (c++ api for imageMagick).

ImageMagick Command: "convert -respect-parenthesis ( INPUT_IMAGE.jpg -colorspace gray -contrast-stretch 0 ) ( -clone 0 -colorspace gray -negate -lat 25x25+30% -contrast-stretch 0 ) -compose copy_opacity -composite -fill white -opaque none -alpha off -background white OUTPUT_IMAGE.jpg"

I tried to convert this code to Magick++ code and failed in "-lat", "-contrast-stretch" and "-compose" positions.

This is my c++ code so far:

Image backgroungImage;
backgroungImage.read("INPUT_IMAGE.jpg");
backgroungImage.colorSpace(GRAYColorspace);
backgroungImage.type(GrayscaleType);
backgroungImage.contrastStretch(0, QuantumRange);
backgroungImage.write("Partial_output.jpg");

If anyone has an idea or a better solution please let me know. thanx in advance.

emcconville emcconville · Accepted Answer · 2017-04-26T13:19:00

You're on the right track with -contrast-stretch. For -lat, remember that's an abbreviation of "Local Adaptive Threshold". So the C++ code would look like...

Image backgroundImage;
// INPUT_IMAGE.jpg
backgroundImage.read("INPUT_IMAGE.jpg");
// -colorspace gray 
backgroundImage.colorSpace(GRAYColorspace);
// -contrast-stretch 0
backgroundImage.contrastStretch(0, QuantumRange);
// -clone 0
Image foregroundImage(backgroundImage);
// -negate
foregroundImage.negate();
// -lat 25x25+30%
foregroundImage.adaptiveThreshold(25, 25, QuantumRange * 0.30);
// -contrast-stretch 0
backgroundImage.contrastStretch(0, QuantumRange);
// -compose copy_opacity -composite
backgroundImage.composite(foregroundImage, 0, 0, CopyAlphaCompositeOp);
// -fill white -opaque none
backgroundImage.opaque(Color("NONE"), Color("WHITE"));
// -alpha off
backgroundImage.alpha(false);
// -background white
backgroundImage.backgroundColor(Color("WHITE"));
// OUTPUT_IMAGE.jpg
backgroundImage.write("OUTPUT_IMAGE.jpg");

Hope that helps!

Convert image magick command to magick++ c++ code

1 Answers