__2017-12-16 如一模式识别研究

如一模式识别研究

OPENCV>>Using OpenCV with Qt

转自:http://www.cnblogs.com/javawebsoa/archive/2013/04/24/3040072.html

The IplImage and Qt

In order to take advantage of the 500 algorithms offered by OpenCV, Qt applications have to manage iplImages. Therefore, converting QImageto/from iplImage is very important.

Converting QImage to iplImage

This snippet will convert QImages into iplImage with depth 8 and 3 channels. QImage can store data in several formats. This code accepts just 24-bit QImage::Format_RGB888 and theQImage::Format_RGB32. Apha values in the 32-bit format will be removed during the conversion.

static IplImage* qImage2IplImage(const QImage& qImage)

{

int width = qImage.width();

int height = qImage.height();

// Creates a iplImage with 3 channels

IplImage *img = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 3);

char * imgBuffer = img->imageData;

//Remove alpha channel

int jump = (qImage.hasAlphaChannel()) ? 4 : 3;

for (int y=0;yheight;y++){

QByteArray a((const char*)qImage.scanLine(y), qImage.bytesPerLine());

for (int i=0; i

//Swap from RGB to BGR

imgBuffer[2] = a[i];

imgBuffer[1] = a[i+1];

imgBuffer[0] = a[i+2];

imgBuffer+=3;

}

}

return img;

}

Converting iplImage to QImage

This snippet will convert a iplImage with depth 8 and 1 or 3 channels into a 8/24-bit QImage.

Note: This code won't work for images with different depth and number of channels.

static QImage IplImage2QImage(const IplImage *iplImage)

{

int height = iplImage->height;

int width = iplImage->width;

if (iplImage->depth == IPL_DEPTH_8U && iplImage->nChannels == 3)

{

const uchar *qImageBuffer = (const uchar*)iplImage->imageData;

QImage img(qImageBuffer, width, height, QImage::Format_RGB888);

return img.rgbSwapped();

} else if (iplImage->depth == IPL_DEPTH_8U && iplImage->nChannels == 1){

const uchar *qImageBuffer = (const uchar*)iplImage->imageData;

QImage img(qImageBuffer, width, height, QImage::Format_Indexed8);

QVector colorTable;

for (int i = 0; i < 256; i++){

colorTable.push_back(qRgb(i, i, i));

}

img.setColorTable(colorTable);

return img;

}else{

qWarning() << "Image cannot be converted.";

return QImage();

}

}

http://www.developer.nokia.com/Community/Wiki/Using_OpenCV_with_Qt

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