Qt中显示opencv的图像

opencv中的图像类型是IplImage,Qt中是QImage

必须要实现两者的转换！。

注意。要记得调用opencv的cvWaitKey()函数。。。

同时，Qt工程中要修改pro文件，添加如下信息：

INCLUDEPATH += . /usr/local/include/opencv
LIBS += /usr/local/lib/libcv.so /
/usr/local/lib/libcvaux.so /
/usr/local/lib/libcxcore.so /
/usr/local/lib/libhighgui.so /
/usr/local/lib/libml.so

函数：

！！下列函数有错误！：

---------------------最后一个for循环-----------------

for(int i = 0; i < 256; i++)
{
colorTable[i] = qRgb(i, i, i);
vcolorTable[i] = colorTable[i];
}

-----------------------应该用vcolorTable的push_back函数-------------------

for(int i = 0; i < 256; i++)
{
colorTable[i] = qRgb(i, i, i);
vcolorTable.push_back(colorTable[i]);
}

_______________________________________________

QImage MainWindow::IplImage2QImage(const IplImage *iplImage, double mini, double maxi) {
uchar *qImageBuffer = NULL;

int width = iplImage->width;

/* Note here that OpenCV image is stored so that each lined is
32-bits aligned thus
* explaining the necessity to "skip" the few last bytes of each
line of OpenCV image buffer.
*/
int widthStep = iplImage->widthStep;
int height = iplImage->height;

switch (iplImage->depth)
{
case IPL_DEPTH_8U:
if(iplImage->nChannels == 1)
{
/* OpenCV image is stored with one byte grey pixel. We convert it
to an 8 bit depth QImage.
*/

qImageBuffer = (uchar *) malloc(width*height*sizeof(uchar));
uchar *QImagePtr = qImageBuffer;
const uchar *iplImagePtr = (const uchar *) iplImage->imageData;

for(int y = 0; y < height; y++)
{
// Copy line by line
memcpy(QImagePtr, iplImagePtr, width);
QImagePtr += width;
iplImagePtr += widthStep;
}

}
else if(iplImage->nChannels == 3)
{
/* OpenCV image is stored with 3 byte color pixels (3 channels).
We convert it to a 32 bit depth QImage.
*/
qImageBuffer = (uchar *) malloc(width*height*4*sizeof(uchar));
uchar *QImagePtr = qImageBuffer;
const uchar *iplImagePtr = (const uchar *) iplImage->imageData;
for(int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
// We cannot help but copy manually.
QImagePtr[0] = iplImagePtr[0];
QImagePtr[1] = iplImagePtr[1];
QImagePtr[2] = iplImagePtr[2];
QImagePtr[3] = 0;

QImagePtr += 4;
iplImagePtr += 3;
}
iplImagePtr += widthStep-3*width;
}

}
else
{
qDebug("IplImageToQImage: image format is not supported : depth=8U and %d channels ", iplImage->nChannels);
}
break;
case IPL_DEPTH_16U:
if(iplImage->nChannels == 1)
{
/* OpenCV image is stored with 2 bytes grey pixel. We convert it
to an 8 bit depth QImage.
*/
qImageBuffer = (uchar *) malloc(width*height*sizeof(uchar));
uchar *QImagePtr = qImageBuffer;
//const uint16_t *iplImagePtr = (const uint16_t *);
const unsigned int *iplImagePtr = (const unsigned int *)iplImage->imageData;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
// We take only the highest part of the 16 bit value. It is
//similar to dividing by 256.
*QImagePtr++ = ((*iplImagePtr++) >> 8);
}
iplImagePtr += widthStep/sizeof(unsigned int)-width;
}
}
else
{
qDebug("IplImageToQImage: image format is not supported : depth=16U and %d channels ", iplImage->nChannels);

}
break;
case IPL_DEPTH_32F:
if(iplImage->nChannels == 1)
{
/* OpenCV image is stored with float (4 bytes) grey pixel. We
convert it to an 8 bit depth QImage.
*/
qImageBuffer = (uchar *) malloc(width*height*sizeof(uchar));
uchar *QImagePtr = qImageBuffer;
const float *iplImagePtr = (const float *) iplImage->imageData;
for(int y = 0; y < height; y++)
{
for(int x = 0; x < width; x++)
{
uchar p;
float pf = 255 * ((*iplImagePtr++) - mini) / (maxi - mini);
if(pf < 0) p = 0;
else if(pf > 255) p = 255;
else p = (uchar) pf;

*QImagePtr++ = p;
}
iplImagePtr += widthStep/sizeof(float)-width;
}
}
else
{
qDebug("IplImageToQImage: image format is not supported : depth=32F and %d channels ", iplImage->nChannels);
}
break;
case IPL_DEPTH_64F:
if(iplImage->nChannels == 1)
{
/* OpenCV image is stored with double (8 bytes) grey pixel. We
convert it to an 8 bit depth QImage.
*/
qImageBuffer = (uchar *) malloc(width*height*sizeof(uchar));
uchar *QImagePtr = qImageBuffer;
const double *iplImagePtr = (const double *) iplImage->imageData;
for(int y = 0; y < height; y++)
{
for(int x = 0; x < width; x++)
{
uchar p;
double pf = 255 * ((*iplImagePtr++) - mini) / (maxi - mini);

if(pf < 0) p = 0;
else if(pf > 255) p = 255;
else p = (uchar) pf;

*QImagePtr++ = p;
}
iplImagePtr += widthStep/sizeof(double)-width;
}
}
else
{
qDebug("IplImageToQImage: image format is not supported : depth=64F and %d channels ", iplImage->nChannels);
}
break;
default:
qDebug("IplImageToQImage: image format is not supported : depth=%d and %d channels ", iplImage->depth, iplImage->nChannels);
}

QImage qImage;
QVector<QRgb> vcolorTable;
if(iplImage->nChannels == 1)
{
// We should check who is going to destroy this allocation.
QRgb *colorTable = new QRgb[256];
for(int i = 0; i < 256; i++)
{
colorTable[i] = qRgb(i, i, i);
vcolorTable[i] = colorTable[i];
}
qImage = QImage(qImageBuffer, width, height, QImage::Format_Indexed8).copy();
qImage.setColorTable(vcolorTable);
}
else
{
qImage = QImage(qImageBuffer, width, height, QImage::Format_RGB32).copy();
}
free(qImageBuffer);
return qImage;
}