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But what if you dont the size of the mat ? suppose reading from a raw file ?

@berak : What input array ? I dont get it ?

I tried both it doesnt work

In the openCV implementation of Android part I have a method called onCameraFrame() which returns the input frame

public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
mNativeDetector.match(inputFrame.rgba());
return inputFrame.rgba();
}

and in the jni side I am receiving it as

Mat mMat1 = (*((Mat*)inputMat));

But when i try to compare it I get this error

OpenCV Error: Assertion failed (type == src2.type() && src1.cols == 
src2.cols && (type == CV_32F || type == CV_8U)) in void 
cv::batchDistance(cv::InputArray, cv::InputArray, cv::OutputArray, int, 
cv::OutputArray, int, int, cv::InputArray, int, bool), file 
/home/reports/ci/slave/50-SDK/opencv/modules/core/src/stat.cpp, line 1797

How to solve this error and pass the Cameraframe mats for comparison ?

Now a color pixel is defined by F5F5C7, But the pixel of image takes only RGB like this

img1.at<cv::Vec3b>(0,0)[0]= 25;
img1.at<cv::Vec3b>(0,0)[1]= 35;
img1.at<cv::Vec3b>(0,0)[2]= 45;

So my question is how do I write F5F5C7 in respective color pixel ?

Hi, I can read an image in java using Highgui.imread(filename), but how to load an Mat file that has been saved on the file system ??