例1顯示照片

#include?"stdafx.h"

#include?<opencv2/opencv.hpp>

using?namespace?std;

using?namespace?cv;

int?main(int?argc,?char*?argv[])

{

const?char*?imagename?=?"woheadai.jpg";

Mat?img?=?imread(imagename);

if(img.empty())

{

fprintf(stderr,?"Can?not?load?image?%s\n",?imagename);

return?-1;

}

imshow("image",?img);

waitKey();

return?0;}

從文件中讀入一幅圖像，將之反色，然后顯示出來

//

//?hello-world.cpp

//

//

#include?<stdafx.h>

#include?<stdlib.h>

#include?<stdio.h>

#include?<math.h>

#include?<cv.h>

#include?<highgui.h>?

int?main(int?argc,?char?*argv[])

{

??IplImage*?img?=?0;?

??int?height,width,step,channels;

??uchar?*data;

??int?i,j,k;?

??const?char*?imagename?=?argc?>?1???argv[1]?:?"ha.jpg";

?/*?if(argc<2){

????printf("Usage:?main?<image-file-name>\n\7");

????exit(0);

??}?

?*/

??//?load?an?image??

??img=cvLoadImage(imagename);

??if(!img){

????printf("Could?not?load?image?file:?%s\n",argv[1]);

????exit(0);

??}?

??//?get?the?image?data

??height????=?img->height;

??width?????=?img->width;

??step??????=?img->widthStep;

??channels??=?img->nChannels;

??data??????=?(uchar?*)img->imageData;

??printf("Processing?a?%dx%d?image?with?%d?channels\n",height,width,channels);?

??//?create?a?window

??cvNamedWindow("ao",?0);?

??cvMoveWindow("ao",?100,?100);?

??//?invert?the?image

??for(i=0;i<height;i++)?for(j=0;j<width;j++)?for(k=0;k<channels;k++)

????data[i*step+j*channels+k]=255-data[i*step+j*channels+k];?

??//?show?the?image

??cvShowImage("ao",?img?);?

??//?wait?for?a?key

??cvWaitKey(0);?

??//?release?the?image

??cvReleaseImage(&img?);

??return?0;

}

?

單張RGB圖片變成灰度圖并保存

#include?"stdafx.h"

#include?"cv.h"

#include?"highgui.h"

int?main(int?argc,?char*?argv[])

{

?IplImage?*image;

?IplImage?*result;

?image=cvLoadImage("lena.jpg",-1);

//注意指針變量定要先初始化才能使用，否則崩潰

//灰度轉換時通道一定?要設置正確

?int?channel=1;??//image->nChannels;

?int?depth=image->depth;

?CvSize?sz;

?sz.width=image->width;

?sz.height=image->height;

?result=cvCreateImage(sz,depth,channel);

?cvCvtColor(image,result,CV_BGR2GRAY);

?cvNamedWindow("original",1);

?cvShowImage("original",image);

?cvNamedWindow("gray",1);

?cvShowImage("gray",result);

?cvSaveImage("hlena.jpg",result);

?cvWaitKey(0);

?cvReleaseImage(&image);

?cvReleaseImage(&result);

cvDestroyWindow("original");

cvDestroyWindow("gray");

?return?0;

}

?

例2顯示視頻

#include?"stdafx.h"

#include?<cv.h>

#include?<cxcore.h>

#include?<highgui.h>

void?main(?)

{

?cvNamedWindow("example2",0);?

?CvCapture?*capture=cvCreateFileCapture("111.mp4");

?IplImage?*frame;

?while(1)

{

??frame=cvQueryFrame(capture);

??if(!frame){break;}

??cvShowImage("example2",frame);

??char?c=cvWaitKey(33);

??if(c==27){break;}

?}

?cvReleaseCapture(&capture);

?cvDestroyWindow("example2");

}

例3?滾動條顯示視頻

#include?"stdafx.h"

#include?<cv.h>

#include?<cxcore.h>

#include?<highgui.h>

int?g_slider_position?=?0;

CvCapture*?g_capture?=?NULL;

void?onTrackbarSlide(int?pos)

{

cvSetCaptureProperty(g_capture,CV_CAP_PROP_POS_FRAMES,pos);

}

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

{

cvNamedWindow(?"Example3",?CV_WINDOW_AUTOSIZE?);

g_capture?=?cvCreateFileCapture(?"1111.mp4");

int?frames?=?(int)cvGetCaptureProperty(g_capture,CV_CAP_PROP_FRAME_COUNT);

if(?frames!=?0?)

{

cvCreateTrackbar("Position","Example3",&g_slider_position,frames,onTrackbarSlide);

}

IplImage*?frame;

?while(1)

{

??frame=cvQueryFrame(g_capture);

??if(!frame){break;}

??cvShowImage("example2",frame);

??char?c=cvWaitKey(33);

??if(c==27){break;}

?}?//?While?loop?(as?in?Example?2)?capture?&?show?video…-

???cvReleaseCapture(&g_capture);

?cvDestroyWindow("example2");//?Release?memory?and?destroy?window…-

return(0);

}

例4圖像平滑處理

#include?"stdafx.h"

#include?"cv.h"

#include?"highgui.h"

void?example2_4(?IplImage*?image?)

{?

//?Create?some?windows?to?show?the?input

????//?and?output?images?in.

????cvNamedWindow(?"Example4-in"?);

????cvNamedWindow(?"Example4-out"?);

????//?Create?a?window?to?show?our?input?image

????//

????cvShowImage(?"Example4-in",?image?);

????//Create?an?image?to?hold?the?smoothed?output

????//cvGetSize(image)

????IplImage*?out=cvCreateImage(cvGetSize(image),IPL_DEPTH_8U,3);

????//?Do?the?smoothing

????//

????cvSmooth(?image,?out,?CV_GAUSSIAN,?3,?3?);//CV_GAUSSIAN

????//?Show?the?smoothed?image?in?the?output?window

????//

????cvShowImage(?"Example4-out",?out?);

????//?Be?tidy

????//

????cvReleaseImage(?&out?);

????//?Wait?for?the?user?to?hit?a?key,?then?clean?up?the?windows

????//

????cvWaitKey(?0?);

????cvDestroyWindow(?"Example4-in"?);

????cvDestroyWindow(?"Example4-out"?);

}??????

int?main(void)?

{

???IplImage*?img?=?cvLoadImage("woheadai.jpg");

???example2_4(img);

???return?1;

}?

例5?使用cvPyDown（）使圖片長寬各縮小一半

#include?"stdafx.h"

#include?"highgui.h"

#include"cv.h"

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,CV_GAUSSIAN_5x5);

???????cvNamedWindow(??"tu1"?,1);

???????cvShowImage(?"tu1",?out);

???????cvWaitKey(0);

???????cvSaveImage("wheadai.jpg",?out);

???????cvReleaseImage(&out);

???????cvDestroyWindow("tu1");

???????return(?out?);

};

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

{

?IplImage?*?img?=?cvLoadImage("woheadai.jpg");

?doPyrDown(?img?);

?cvReleaseImage(&img);

?return?0;

}

例6?canny?邊緣檢測將輸出寫入一個單通道（灰度級）圖像

#include?"stdafx.h"

#include?"highgui.h"

#include"cv.h"

IplImage?*?doCanny(IplImage?*?in,double?lowThresh,?double?highThresh,int?aperture?)

{

???????if(in->nChannels?!=1)

????????return(0);

???????IplImage?*?out?=?cvCreateImage(cvSize(?in->width,in->height),?IPL_DEPTH_8U,1?);

???????cvCanny(?in,?out,?lowThresh,?highThresh,?aperture);

???????cvNamedWindow(??"hb"?,1);

???????cvShowImage(?"hb",?out);

???????cvWaitKey(0);

???????cvSaveImage("11.jpg",?out);

???????cvReleaseImage(&out);

???????cvDestroyWindow("hb");

???????return(?out?);

};

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

{

?IplImage?*?img?=?cvLoadImage(?"11.jpg",?0);

?doCanny(?img,1,2.4,3);

?cvReleaseImage(&img);

?return?0;

}

例7?圖像處理中兩次縮放和canny?邊緣檢測例?8?通過每個獨立階段釋放內存來簡化7中圖像處理

#include?"stdafx.h"

#include?"highgui.h"

#include"cv.h"

IplImage?*?out;

IplImage?*?doPyrDown(IplImage?*?in?)

{

??????assert(in->width%2?==?0?&&?in->height%2?==?0);

??????out?=?cvCreateImage(?cvSize(?in->width/2,?in->height/2?),?in->depth,?in->nChannels?);

???????cvPyrDown(?in,?out,CV_GAUSSIAN_5x5);

???????return(?out?);

};

IplImage?*?doCanny(?IplImage?*?in,?double?lowThresh,?double?highThresh,?int?aperture?)

{

???????if(in->nChannels?!=1)

????????return(0);

???????IplImage?*?out?=?cvCreateImage(cvSize(?in->width,?in->height),IPL_DEPTH_8U,?1?);

???????cvCanny(?in,?out,?lowThresh,?highThresh,?aperture);

???????return(?out?);

};

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

{

?IplImage?*?img?=?cvLoadImage(?"ha.jpg",?0);

?out?=?doPyrDown(?img?);

?out?=?doPyrDown?(?out?);

?out?=?doCanny(?out,1,3,3);

??cvNamedWindow(??"kk"?,1);

?????cvShowImage(?"kk",?out);

?????cvWaitKey(0);

?????cvSaveImage("haha.jpg",?out);

?????cvReleaseImage(&out);

?????cvDestroyWindow("kk");

?????cvReleaseImage(&img);

??return?0;

}

例9?capture?結構初始化后，從攝像設備讀入圖像并保存（或者從視頻無區別）

#include?"stdafx.h"

#include?"cv.h"

#include?"highgui.h"

#include?"conio.h"

int?main(?)?{

CvCapture?*capture?=?cvCaptureFromCAM(?CV_CAP_ANY?);

IplImage?*image?=?NULL;?//*dst?=?NULL;

image?=?cvQueryFrame(?capture?);

CvSize?size?=?cvGetSize(?image?);

//dst?=?cvCreateImage(?size,?image->depth,?1?);

double?fps?=?10;

CvVideoWriter*?writer?=?cvCreateVideoWriter(?"Video?from?CAMERA.avi",?CV_FOURCC('X','V','I','D'),?fps,?size,?1?);

cvNamedWindow(?"ha",?1);

while(?(image?=?cvQueryFrame(?capture?))?!=?NULL?)

{?

?printf("Enteredn");?

?//cvCvtColor(?image,?dst,?CV_RGB2GRAY?);

?cvShowImage("ha",?image);

?cvWriteFrame(?writer,?image?);

?if(?(cvWaitKey(100))?==?27?)

??break;

}

cvReleaseVideoWriter(?&writer?);

cvReleaseCapture(?&capture?);

//cvReleaseImage(?&dst?);

cvDestroyWindow(?"ha"?);

}

總結

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