学习OpenCV（一）

#include <cv.h>
#include <highgui.h>
using namespace std;

int g_slider_position = 0;
CvCapture *g_capture = NULL;

void onTrackbarSlide(int pos){
cvSetCaptureProperty(g_capture, CV_CAP_PROP_POS_FRAMES, pos);
}

//利用cvPyrDown创建输入图像宽高一半的图像
IplImage* doPyrDown( IplImage *in, int filter = IPL_GAUSSIAN_5x5 ){
assert(in->width % 2 == 0 && in->height % 2 == 0);
IplImage *out = cvCreateImage(cvSize(in->width/2, in->height/2), in->depth, in->nChannels);
cvPyrDown(in, out);
return (out);
}

//对图像进行平滑处理
void example1( IplImage *image ){
cvNamedWindow("hzh1", 0);
cvNamedWindow("hzh2", 0);

cvShowImage("hzh1", image);

IplImage *out = cvCreateImage(cvGetSize(image), IPL_DEPTH_8U, 3);
cvSmooth(image, out, CV_GAUSSIAN, 3, 3);
cvShowImage("hzh2", out);

cvReleaseImage(&out);

cvWaitKey(0);

cvDestroyWindow("hzh1");
cvDestroyWindow("hzh2");
}

//打开avi视屏 并添加滚动条
void example2(){
cvNamedWindow("xxx", CV_WINDOW_AUTOSIZE);
g_capture = cvCreateFileCapture("E:\\ConsoleApplication5\\ConsoleApplication5\\hzhhzh.avi");

int frames = (int)cvGetCaptureProperty(g_capture, CV_CAP_PROP_FRAME_COUNT);
if (frames != 0){
cvCreateTrackbar("Position", "xxx", &g_slider_position, frames, onTrackbarSlide);
}

IplImage *frame;
while (1){
frame = cvQueryFrame(g_capture);
if (!frame) break;
cvSetTrackbarPos("Position", "xxx", ++g_slider_position);
cvShowImage("xxx", frame);
char c = cvWaitKey(1);
if (c == 27){
break;
}
}
cvReleaseCapture(&g_capture);
cvDestroyWindow("xxx");
}

//边缘检测 输出单通道图像
IplImage* doCanny(
IplImage* in,
double lowThresh,
double highThresh,
double aperture
){
//  if (in->nChannels != 1){
//      return 0;
//  }

IplImage *out = cvCreateImage(
cvGetSize(in),
IPL_DEPTH_8U,
1
);

cvCanny(in, out, lowThresh, highThresh, aperture);
return out;
}

//读取彩色视屏，并以灰度格式输出
void example3(){
CvCapture *capture = 0;
capture = cvCreateFileCapture("E:\\opencv\\sources\\samples\\cpp\\tutorial_code\\HighGUI\\video-input-psnr-ssim\\video\\Megamind.avi");
IplImage *bgr_frame = cvQueryFrame(capture);
double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
CvSize size = cvSize((int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH),
(int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT)
);
CvVideoWriter *writer = cvCreateVideoWriter(
"hzhhzh.avi",
CV_FOURCC('M', 'J', 'P', 'G'),
fps,
size
);
IplImage *logpolar_frame = cvCreateImage(
size,
IPL_DEPTH_8U,
3
);
while ((bgr_frame = cvQueryFrame(capture)) != NULL){
cvLogPolar(bgr_frame,
logpolar_frame,
cvPoint2D32f(bgr_frame->width/2, bgr_frame->height/2),
40,
CV_INTER_LINEAR + CV_WARP_FILL_OUTLIERS
);
cvWriteFrame(writer, logpolar_frame);
}
cvReleaseVideoWriter(&writer);
cvReleaseImage(&logpolar_frame);
cvReleaseCapture(&capture);
}

int main() {
IplImage *xx = cvvLoadImage("E:\\新建文件夹\\73F1DDAD71C72EAA72674E618DA840A8_140.jpg");

cvNamedWindow("hzh1",0);
//  cvNamedWindow("hzh2",0);
//
cvRectangle(xx, cvPoint(5, 10), cvPoint(20, 300), cvScalar(255-, 0, 0));
cvShowImage("hzh1", xx);
//  cvShowImage("hzh2", doCanny(xx,10,100,3));
cvWaitKey(0);
//  cvDestroyWindow("hzh1");
//  cvDestroyWindow("hzh2");
//
//  example2();
//  example1(xx);

//  example3();
//  example2();
return 0;
}