I am very new to opencv and started using OPENCV 3.0
I have run code taken from imwrite in the OPENCV API reference documentation as it is from [link text](http://docs.opencv.org/3.0-beta/modules/imgcodecs/doc/reading_and_writing_images.html)
and got the following error:
error: ‘CV_IMWRITE_PNG_COMPRESSION’ was not declared in this scope
compression_params.push_back(CV_IMWRITE_PNG_COMPRESSION);
and the code is as follows:
#include
#include
#include
using namespace cv;
using namespace std;
void createAlphaMat(Mat &mat)
{
for (int i = 0; i < mat.rows; ++i) {
for (int j = 0; j < mat.cols; ++j) {
Vec4b& rgba = mat.at(i, j);
rgba[0] = UCHAR_MAX;
rgba[1] = saturate_cast((float (mat.cols - j)) / ((float)mat.cols) * UCHAR_MAX);
rgba[2] = saturate_cast((float (mat.rows - i)) / ((float)mat.rows) * UCHAR_MAX);
rgba[3] = saturate_cast(0.5 * (rgba[1] + rgba[2]));
}
}
}
int main(int argv, char **argc)
{
// Create mat with alpha channel
Mat mat(480, 640, CV_8UC4);
createAlphaMat(mat);
vector compression_params;
compression_params.push_back(CV_IMWRITE_PNG_COMPRESSION);
compression_params.push_back(9);
try {
imwrite("alpha.png", mat, compression_params);
}
catch (runtime_error& ex) {
fprintf(stderr, "Exception converting image to PNG format: %s\n", ex.what());
return 1;
}
fprintf(stdout, "Saved PNG file with alpha data.\n");
return 0;
}
Can someone help me in debugging this?
↧