Hi! I have been trying to write a function to compute the 3D histogram of a color image. i am very new to OpenCV. I am unable to get the result. I am getting the following error
OpenCV Error: Assertion failed (csz == 0 || csz == dims) in unknown function, file ......\src\opencv\modules\imgproc\src\histogram.cpp, line 1419 CvException [org.opencv.core.CvException: ......\src\opencv\modules\imgproc\src\histogram.cpp:1419: error: (-215) csz == 0 || csz == dims ] at org.opencv.imgproc.Imgproc.calcHist_1(Native Method) at org.opencv.imgproc.Imgproc.calcHist(Imgproc.java:2775) at shikhar.logic.OpenCVTest.getColorHistogram(OpenCVTest.java:82) at shikhar.logic.OpenCVTest.compareImages(OpenCVTest.java:133) at shikhar.logic.OpenCVTest.main(OpenCVTest.java:30) OpenCV Error: Assertion failed (csz == 0 || csz == dims) in unknown function, file ......\src\opencv\modules\imgproc\src\histogram.cpp, line 1419 CvException [org.opencv.core.CvException: ......\src\opencv\modules\imgproc\src\histogram.cpp:1419: error: (-215) csz == 0 || csz == dims ] at org.opencv.imgproc.Imgproc.calcHist_1(Native Method) at org.opencv.imgproc.Imgproc.calcHist(Imgproc.java:2775) at shikhar.logic.OpenCVTest.getColorHistogram(OpenCVTest.java:82) at shikhar.logic.OpenCVTest.compareImages(OpenCVTest.java:134) at shikhar.logic.OpenCVTest.main(OpenCVTest.java:30) java.lang.NullPointerException at org.opencv.imgproc.Imgproc.compareHist(Imgproc.java:2848) at shikhar.logic.OpenCVTest.compareImages(OpenCVTest.java:135) at shikhar.logic.OpenCVTest.main(OpenCVTest.java:30) -1.0
the code I had written was
public static Mat getColorHistogram(String imgLocation)
{
try
{
Mat img=new Mat();
img=org.opencv.highgui.Highgui.imread(imgLocation);
List<Mat> imagesList=new ArrayList<>();
imagesList.add(img);
//Mat tempChannel=new Mat(new Size(3,1),org.opencv.core.CvType.
int histSizeArray[]={256,256,256};
int channelArray[]={0,1,2};
MatOfInt channels=new MatOfInt(channelArray);
//mChannels = new MatOfInt[] { new MatOfInt(0), new MatOfInt(1), new MatOfInt(2) };
Mat hist=new Mat();
MatOfInt histSize=new MatOfInt(25);
//histSize.fromArray(histSizeArray);
//histSize = new MatOfInt(256);
float hrangesArray[]={0.0f,255.0f};
MatOfFloat ranges=new MatOfFloat(0.0f,255.0f);
org.opencv.imgproc.Imgproc.calcHist(imagesList, channels,new Mat(), hist, histSize, ranges);
return hist;
}
catch(Exception e)
{
e.printStackTrace();
return null;
}
}
Here the line 82 corresponds to the calcHist line
