[C++, OpenCV] Convert Arr2Mat, Mat2Arr / 16bit(short) to 8bit(unsigned char) / CV_type

 

Convert Arr to Mat

short* psImage;
Mat psImage_mat(nWidth, nHeight, CV_16SC1, psImage);

Convert Mat to Arr

short* psImage_arr = (short*)psImage_mat.data;

Convert 16bit(short) to 8bit(unsigned char)

normalization

Mat img(row, col, CV_16SC1); // 16bit(short)
Mat img_8UC1 = img.clone();

// get min, max
double minVal;
double maxVal;
Point minLoc;
Point maxLoc;
minMaxLoc(img, &minVal, &maxVal, &minLoc, &maxLoc);

// normalization
img_8UC1 -= minVal;
img_8UC1.convertTo(img_8UC1, CV_8U, 255.0 / (maxVal - minVal)); // 8bit(uchar)

 

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CV_type

Mat의 요소가 어떤 타입의 데이터인지 지정

• CV_8UC1 : 8bit unsigned char (0~255) => imshow 가능
• CV_8SC1 : 8bit signed char (-128~127) => imshow 가능
• CV_16UC1 : 16bit unsigned short (0~65535)
• CV_16SC1 : 16bit signed short (-32768~32767)
• CV_32SC1 : 32bit signed int (-2147483648~2147483647)

 

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normalize (0~1로 정규화)

cv::normalize(src, dst, 0, 1, NORM_MINMAX, CV_8UC1);