// libimageproc.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include "libimageproc.h"
#include "highgui.h"
#include "cv.h"
#include "resource.h"


LIBIMAGEPROC_API bool imageprocess(char* BackImgPath, char* FrontImgPath, char* ResultImgPath)
{
	IplImage* pBK = cvLoadImage(BackImgPath, 1);
	
	IplImage* pfront = cvLoadImage(FrontImgPath, 1);
	if (pBK == NULL || pfront == NULL)
		return false;
	IplImage* pImg = cvCreateImage(cvSize(pfront->width, pfront->height), IPL_DEPTH_8U, 1);
	int j, i;
	CvMat bk;
	cvGetSubRect(pBK, &bk, cvRect(200, 30, pfront->width, pfront->height));

	cvCvtColor(pfront, pImg, CV_RGB2GRAY); //rgb转换为灰度图
	for (j = 0; j < pImg->height; j++)
	{
		uchar* ptr = (uchar*)(pImg->imageData + j * pImg->widthStep);
		uchar* ptr1 = (uchar*)(pfront->imageData + j * pfront->widthStep);
		uchar* ptr2 = (uchar*)(bk.data.ptr + j * bk.step);
		for (i = 0; i < pImg->width; i++)
		{
			if (ptr[i] < 220)  //像素值小于220的保留下来 并显示到背景图上 即白色部分被去除 
			{
				ptr2[i * 3] = ptr1[i * 3];
				ptr2[i * 3 + 1] = ptr1[i * 3 + 1];
				ptr2[i * 3 + 2] = ptr1[i * 3 + 2];
			}
		}
	}

	cvSaveImage(ResultImgPath, pBK);
	cvReleaseImage(&pBK);
	cvReleaseImage(&pfront);
	cvReleaseImage(&pImg);
	return true;
}