How do I convert an array<System:Byte>^ to a Mat in openCV. I am being passed a array<System:Byte>^ in c++/cli, but I need to convert it to Mat to be able to read it and display it.
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Joe Mastey
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fmvpsenior
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What data does your byte array contain? Is it just the matrix data, or is it the full Mat object, including data members such as `Mat->rows` & `Mat->cols`? – David Yaw Jun 27 '13 at 18:17
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It is the jpeg image data, so just the matrix data – fmvpsenior Jun 27 '13 at 20:53
1 Answers
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You can use constructor Mat::Mat(int rows, int cols, int type, void* data, size_t step=AUTO_STEP). The conversion may look like this.
void byteArray2Mat(array<System::Byte>^ byteArray, cv::Mat &output)
{
pin_ptr<System::Byte> p = &byteArray[0];
unsigned char* pby = p;
char* pch = reinterpret_cast<char*>(pby);
// assuming your input array has 2 dimensions.
int rows = byteArray->GetLength(0);
int cols = byteArray->GetLength(1);
output = cv::Mat(rows, cols, CV_8UC1, (void*)pch)
}
I don't have c++/CLI to test the program and this may not be most efficient method. At least it should give you an idea on how to get started.
