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How do I compile a C program that contains a OPENCV header file?h

asked 2018-08-07 09:54:59 -0500

What can I do to include a custom OPENCV and then use EMCC to package it into a wasm file?

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answered 2018-08-08 03:45:42 -0500

Jendker gravatar image

I am doing it pretty normally with CMake build system. Just rember to compile OpenCV also with emcc and you will be fine.

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Thank you for your reply.Could you tell you the step?
this is my command

emcc -O2 ss.bc -o project.js -s WASM=1 -O3 -s "EXTRA_EXPORTED_RUNTIME_METHODS=['ccall', 'cwrap']" -s EXPORTED_FUNCTIONS="['_int_sqrt']"

#include "opencv2/imgcodecs/imgcodecs.hpp"
#include <emscripten/emscripten.h>
using namespace cv;
extern "C" {
int int_sqrt(int x) {
  IplImage *src = cvLoadImage("./a.png", 1);
  IplImage *dst = cvCreateImage(CvSize(src->width, src->height), src->depth, src->nChannels);
    //cvSobel(src, dst, 0, 1, 7);
    cvSobel(src, dst, 0, 1, CV_SCHARR);
    cvShowImage("dst", dst);
  return 0;
}
}

error info:warning: unresolved symbol: cvCreateImage

tangtao gravatar imagetangtao ( 2018-08-09 02:34:03 -0500 )edit

Did you compile OpenCV with emcc? https://docs.opencv.org/3.4.0/d4/da1/... Besides loading with cvLoadImage will probably not work so easily with WebAssmebly. You need to take care of the filesystem virtualization https://kripken.github.io/emscripten-...

Jendker gravatar imageJendker ( 2018-08-13 03:53:31 -0500 )edit
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Asked: 2018-08-07 09:54:59 -0500

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Last updated: Aug 08