Color Filter with OpenCV

This is a color filter test coded with OpenCV. There are six track bars to set the minimum and the maximum ranges of color. here cvInRangeS( ) openCV function has used to filter out the color according to the MAX and MIN values. This is just an one method to do filtering color.

nput image

Output image

// filter.cpp : Defines the entry point for the console application.

#include "stdafx.h"
#include
#include
#include

#define IN_RANG_FILTER

void in_rang_filter();
void Allocate_imgs();


IplImage *img = NULL,*test,*imgHsv,*imgResult;
int mR_val=19,mG_val=13,mB_val=18,MAR_val=154,MAG_val=256,MAB_val=79;//default green .ctrl BLUE to find color


void set_RGB(int pos)
{
#ifdef IN_RANG_FILTER
in_rang_filter();
#endif
}


int main(int argc, char** argv)
{

CvSeq* find_contour = NULL;
bool isStop = false;
img = cvLoadImage("test.jpg");
if(img == NULL)
{
printf("capture device not found!!");
return -1;
}


Allocate_imgs();

// creat windows
cvNamedWindow("Capture", CV_WINDOW_AUTOSIZE);
cvNamedWindow("Result", CV_WINDOW_AUTOSIZE);


//To in_rang_filter() MIN , MAX RGB value set
cvCreateTrackbar( "minR","Result",&mR_val, 256,set_RGB);
cvCreateTrackbar( "minG","Result",&mG_val, 256,set_RGB);
cvCreateTrackbar( "minB","Result",&mB_val, 256,set_RGB);

cvCreateTrackbar( "maxR","Result",&MAR_val, 256,set_RGB);
cvCreateTrackbar( "maxG","Result",&MAG_val, 256,set_RGB);
cvCreateTrackbar( "maxB","Result",&MAB_val, 256,set_RGB);
//


cvCvtColor( img, imgHsv, CV_BGR2HSV);//convert the color space
in_rang_filter();


cvShowImage("Capture", img);
cvShowImage("Result", test);
cvWaitKey(0);
cvReleaseImage(&imgResult);
cvReleaseImage(&imgHsv);
cvDestroyAllWindows();

}


void in_rang_filter()
{
IplImage* test=cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 3);
CvScalar min_color = CV_RGB(mR_val,mG_val,mB_val);
CvScalar max_color = CV_RGB(MAR_val,MAG_val,MAB_val);
cvInRangeS(imgHsv, min_color,max_color, imgResult);//search for the color in image

cvCvtColor( imgResult, test,CV_GRAY2RGB);
cvShowImage("Result", test);
cvReleaseImage(&test);
}

void Allocate_imgs()
{
const int w = img->width;
const int h = img->height;
imgResult = cvCreateImage(cvSize(w, h), IPL_DEPTH_8U,1);
imgHsv=cvCreateImage(cvSize(w, h), IPL_DEPTH_8U, 3);
}

code can be downloaded here (.rar).