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Editorial Team
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Asked: 2026-06-02T10:03:32+00:00

I’ve cloned https://github.com/niw/iphone_opencv_test and tried to replace #import <opencv2/imgproc/imgproc_c.h> #import <opencv2/objdetect/objdetect.hpp> with #import <opencv2/opencv.hpp>

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I’ve cloned https://github.com/niw/iphone_opencv_test and tried to replace

#import <opencv2/imgproc/imgproc_c.h>
#import <opencv2/objdetect/objdetect.hpp>

with 

#import <opencv2/opencv.hpp>

in OpenCVTestViewController.m file. But XCode threw following error:

iphone_opencv_test/opencv_device/include/opencv2/opencv.hpp:55:10: fatal error: 'opencv2/calib3d/calib3d.hpp' file not found [2]
 #include "opencv2/calib3d/calib3d.hpp"

So, I’ve tried to remove the line #include "opencv2/calib3d/calib3d.hpp" from the opencv.hpp file. The error below was thrown:

iphone_opencv_test/opencv_device/include/opencv2/ml/ml.hpp:2075:10: fatal error: 'map' file not found [2]
 #include <map>

I’ve also tried to change .m to .mm, but it seemed futile. Where I’m wrong?

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1 Answer

  1. Editorial Team

    There’s a conflict between OpenCV’s MAX/MIN macros and Cocoa’s MAX/MIN. It leads to strange errors like this one at compile time. To bypass this problem, you can either:
    1. add at the top of the pre-defined header file
    2. totally decouple opencv and obj-c code, so that no .m/.mm file includes . This can be done for example by using boost GIL in-between, or using custom vanilla C++ classes to pass image data from Cocoa frameworks to opencv C++ image processing classes.

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