C++ Implementation of Sobel Edge Detection

This program implements edge detection using the sobel operator

If your image has 3 channels(r,b,g), the program will convert it to grayscale first. It will also give a grayscale.jpg file.

If you would like to visualize different parts of this algorithm, then you can use sobelEdgeDetectionExtra.cpp, which will create ver.jpg and hor.jpg which show the vertical and horizontal changes respectively. A sobel-orientation.jpg is also made which shows the orientations of the edges.

You might want to increase the memory a program can use using your bash since the programs are not too memory efficient, therefore high res images might not work. The extra program is even more so.. To increase stack size to 32MB (which is 8MB by default):

ulimit -s 32767

To compile and then run:

g++ -O3 sobelEdgeDetection.cpp -o sobel -ljpeg -fpermissive
./sobel <input image file name> <output image file name>

My Example:

./sobel HK2.jpg hkborder.jpg

Requires jpeg library:

sudo yum install openjpeg-devel

or

sudo apt-get install openjpeg-devel