我试图将我在互联网上找到的OpenCV-codesample从旧的IplImage-Format转换为当前使用的Mat-Format，但是对于正确使用指针/类没有经验，希望有人可以帮助我转换几个代码行。代码主要初始化网络摄像头，抓取帧并通过OpenGL显示它们。
提到的困难代码：
CvCapture *cvCapture = 0;
cvCapture = cvCreateCameraCapture(0);
IplImage* newImage = cvQueryFrame( cvCapture );
cvReleaseCapture( &cvCapture );
我试过了：
cv::VideoCapture *cvCapture = 0;
cvCapture.open(0);
cvCapture.read(cv:Mat& newImage);
cvCapture.release;
原始代码：
#ifdef WIN32
#include <windows.h>
#endif
#include <stdio.h>
#include <gl/glew.h>
#include <gl/glut.h>
#include <opencv/highgui.h>
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// GLUT callbacks and functions
void initGlut(int argc, char **argv);
void displayFunc(void);
void idleFunc(void);
void reshapeFunc(int width, int height);
void mouseFunc(int button, int state, int x, int y);
void mouseMotionFunc(int x, int y);
void keyboardFunc(unsigned char key, int x, int y);
void specialFunc(int key, int x, int y);
//-----------------------------------------------------------------------------
// other [OpenGL] functions
void countFrames(void);
void renderBitmapString(float x, float y, float z, void *font, char *string);
//-----------------------------------------------------------------------------
bool bFullsreen = false;
int nWindowID;
//-----------------------------------------------------------------------------
// parameters for the framecounter
char pixelstring[30];
int cframe = 0;
int time = 0;
int timebase = 0;
//-----------------------------------------------------------------------------
// OpenCV variables
CvCapture *cvCapture = 0;
GLuint cameraImageTextureID;
//-----------------------------------------------------------------------------
bool bInit = false;
//-----------------------------------------------------------------------------
void displayFunc(void) {
if(!bInit) {
// initialize 1st camera on the bus
cvCapture = cvCreateCameraCapture(0);
// initialze OpenGL texture
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glGenTextures(1, &cameraImageTextureID);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, cameraImageTextureID);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
bInit = true;
}
IplImage* newImage = cvQueryFrame( cvCapture );
if( (newImage->width > 0) && (newImage->height > 0)) {
// clear the buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0,(GLdouble)newImage->width,0.0,(GLdouble)newImage->height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, cameraImageTextureID);
if(newImage->nChannels == 3)
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGB, newImage->width, newImage->height, 0,
GL_BGR, GL_UNSIGNED_BYTE, newImage->imageData);
else if(newImage->nChannels == 4)
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, newImage->width, newImage->height,
0, GL_BGRA, GL_UNSIGNED_BYTE, newImage->imageData);
glBegin(GL_QUADS);
glTexCoord2i(0,0);
glVertex2i(0,0);
glTexCoord2i(newImage->width,0);
glVertex2i(newImage->width,0);
glTexCoord2i(newImage->width,newImage->height);
glVertex2i(newImage->width,newImage->height);
glTexCoord2i(0,newImage->height);
glVertex2i(0,newImage->height);
glEnd();
}
glDisable(GL_TEXTURE_RECTANGLE_ARB);
countFrames();
glutSwapBuffers();
}
//-----------------------------------------------------------------------------
void initGlut(int argc, char **argv) {
// GLUT Window Initialization:
glutInit (&argc, argv);
glutInitWindowSize (640, 480);
glutInitWindowPosition(300, 100);
glutInitDisplayMode ( GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
nWindowID = glutCreateWindow ("simpleGLUT - CvCamera");
// Register callbacks:
glutDisplayFunc (displayFunc);
glutReshapeFunc (reshapeFunc);
glutKeyboardFunc (keyboardFunc);
glutSpecialFunc (specialFunc);
glutMouseFunc (mouseFunc);
glutMotionFunc (mouseMotionFunc);
glutIdleFunc (idleFunc);
}
//-----------------------------------------------------------------------------
void idleFunc(void) {
glutPostRedisplay();
}
//-----------------------------------------------------------------------------
void reshapeFunc(int width, int height) {
glViewport(0, 0, width, height);
}
//-----------------------------------------------------------------------------
// mouse callback
void mouseFunc(int button, int state, int x, int y) {
}
//-----------------------------------------------------------------------------
void mouseMotionFunc(int x, int y) {
}
//-----------------------------------------------------------------------------
void keyboardFunc(unsigned char key, int x, int y) {
switch(key) {
// -----------------------------------------
#ifdef WIN32
// exit on escape
case '\033':
if(bInit) {
glDeleteTextures(1, &cameraImageTextureID);
cvReleaseCapture( &cvCapture );
}
exit(0);
break;
#endif
// -----------------------------------------
// switch to fullscreen
case 'f':
bFullsreen = !bFullsreen;
if(bFullsreen)
glutFullScreen();
else {
glutSetWindow(nWindowID);
glutPositionWindow(100, 100);
glutReshapeWindow(640, 480);
}
break;
// -----------------------------------------
}
}
//-----------------------------------------------------------------------------
void specialFunc(int key, int x, int y) {
//printf("key pressed: %d\n", key);
}
//-----------------------------------------------------------------------------
void countFrames(void) {
time=glutGet(GLUT_ELAPSED_TIME);
cframe++;
if (time - timebase > 50) {
sprintf(pixelstring, "fps: %4.2f", cframe*1000.0/(time-timebase));
timebase = time;
cframe = 0;
// Draw status text and uni-logo:
}
glDisable(GL_LIGHTING);
glColor4f(1.0,1.0,1.0,1.0);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0, 200, 0, 200);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
// render the string
renderBitmapString(5,5,0.0,GLUT_BITMAP_HELVETICA_10,pixelstring);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
}
//-----------------------------------------------------------------------------
void renderBitmapString(float x, float y, float z, void *font, char *string) {
char *c;
glRasterPos3f(x, y,z);
for (c=string; *c != '\0'; c++) {
glutBitmapCharacter(font, *c);
}
}
//-----------------------------------------------------------------------------
void main(int argc, char **argv) {
initGlut(argc, argv);
glutMainLoop();
}
答案 0 :(得分：0)
解决了我自己的问题。还必须更改旧代码，如：newImage-＆gt; width和newImage-＆gt; nChannels。不知道代码有多稳定，但也许有人可以使用它：
#ifdef WIN32
#include <windows.h>
#endif
#include <stdio.h>
#include <gl/glew.h>
#include <gl/glut.h>
#include <opencv/highgui.h>
#include <opencv2\highgui.hpp>
#include <opencv2\core.hpp>
//-----------------------------------------------------------------------------
// GLUT callbacks and functions
void initGlut(int argc, char **argv);
void displayFunc(void);
void idleFunc(void);
void reshapeFunc(int width, int height);
void mouseFunc(int button, int state, int x, int y);
void mouseMotionFunc(int x, int y);
void keyboardFunc(unsigned char key, int x, int y);
void specialFunc(int key, int x, int y);
//-----------------------------------------------------------------------------
// other [OpenGL] functions
void countFrames(void);
void renderBitmapString(float x, float y, float z, void *font, char *string);
//-----------------------------------------------------------------------------
bool bFullsreen = false;
int nWindowID;
//-----------------------------------------------------------------------------
// parameters for the framecounter
char pixelstring[30];
int cframe = 0;
int time = 0;
int timebase = 0;
//-----------------------------------------------------------------------------
// OpenCV variables
cv::VideoCapture cap(0);
GLuint cameraImageTextureID;
//-----------------------------------------------------------------------------
bool bInit = false;
//-----------------------------------------------------------------------------
void displayFunc(void) {
if(!bInit) {
// initialize 1st camera on the bus
// initialze OpenGL texture
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glGenTextures(1, &cameraImageTextureID);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, cameraImageTextureID);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
bInit = true;
}
cv::Mat newImage;
cap.read(newImage);
int rows = newImage.rows;
int cols = newImage.cols;
cv::Size s = newImage.size();
rows = s.height;
cols = s.width;
if( (s.width > 0) && (s.height > 0)) {
// clear the buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0,(GLdouble)s.width,0.0,(GLdouble)s.height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, cameraImageTextureID);
if(newImage.channels() == 3)
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGB, s.width, s.height, 0, GL_BGR,
GL_UNSIGNED_BYTE, newImage.data);
else if(newImage.channels() == 4)
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, s.width, s.height, 0, GL_BGRA,
GL_UNSIGNED_BYTE, newImage.data);
glBegin(GL_QUADS);
glTexCoord2i(0,0);
glVertex2i(0,0);
glTexCoord2i(s.width,0);
glVertex2i(s.width,0);
glTexCoord2i(s.width,s.height);
glVertex2i(s.width,s.height);
glTexCoord2i(0,s.height);
glVertex2i(0,s.height);
glEnd();
}
glDisable(GL_TEXTURE_RECTANGLE_ARB);
countFrames();
glutSwapBuffers();
}
void idleFunc(void) {
glutPostRedisplay();
}
void reshapeFunc(int width, int height) {
glViewport(0, 0, width, height);
}
void mouseFunc(int button, int state, int x, int y) {
}
void mouseMotionFunc(int x, int y) {
}
void keyboardFunc(unsigned char key, int x, int y) {
switch(key) {
// exit on escape
case '\033':
if(bInit) {
glDeleteTextures(1, &cameraImageTextureID);
cap.release();
}
exit(0);
break;
// switch to fullscreen
case 'f':
bFullsreen = !bFullsreen;
if(bFullsreen)
glutFullScreen();
else {
glutSetWindow(nWindowID);
glutPositionWindow(100, 100);
glutReshapeWindow(640, 480);
}
break;
}
}
void specialFunc(int key, int x, int y) {
//printf("key pressed: %d\n", key);
}
void countFrames(void) {
time=glutGet(GLUT_ELAPSED_TIME);
cframe++;
if (time - timebase > 50) {
sprintf(pixelstring, "fps: %4.2f", cframe*1000.0/(time-timebase));
timebase = time;
cframe = 0;
// Draw status text and uni-logo:
}
glDisable(GL_LIGHTING);
glColor4f(1.0,1.0,1.0,1.0);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0, 200, 0, 200);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
// render the string
renderBitmapString(5,5,0.0,GLUT_BITMAP_HELVETICA_10,pixelstring);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
}
void renderBitmapString(float x, float y, float z, void *font, char *string) {
char *c;
glRasterPos3f(x, y,z);
for (c=string; *c != '\0'; c++) {
glutBitmapCharacter(font, *c);
}
}
void main(int argc, char **argv) {
glutInit (&argc, argv);
glutInitWindowSize (640, 480);
glutInitWindowPosition(300, 100);
glutInitDisplayMode ( GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
nWindowID = glutCreateWindow ("simpleGLUT - CvCamera");
// Register callbacks:
glutDisplayFunc (displayFunc);
glutReshapeFunc (reshapeFunc);
glutKeyboardFunc (keyboardFunc);
glutSpecialFunc (specialFunc);
glutMouseFunc (mouseFunc);
glutMotionFunc (mouseMotionFunc);
glutIdleFunc (idleFunc);
glutMainLoop();
}