Hi,
I think there was a similar question already asked in which it was asked how to install OpenCV in a Yocto image. After doing that successfully, I tried to cross compile a small application reading frames from a camera. The code follows here:
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
int main(int argc, char *argv[]){
if (argc < 2){
printf("Usage: cameratest cameraId \n");
return 0;
}
printf("Trying camera at port %s \n", argv[1]);
cv::VideoCapture capture = cv::VideoCapture(atoi(argv[1]));
if (capture.isOpened() == false){
printf("Could not open camera port. \n");
return -1;
}
cv::Mat frame;
int frameCount = 0;
printf("Camera test started. \n");
while(1){
if (! capture.read(frame) ){
printf("Failed reading. \n");
break;
}
printf("Read frame %d \n", frameCount);
}
}
and the CMakeLists.txt file that I'm using here:
cmake_minimum_required(VERSION 2.6)
project(camera_test)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x -O3 -fsigned-char -march=armv7-a -mfpu=neon -mfloat-abi=hard")
file(GLOB_RECURSE src/*.cpp)
find_package(OpenCV REQUIRED)
add_executable(camera_test src/camera_test.cpp)
target_link_libraries(camera_test opencv_core opencv_ml opencv_highgui)
install(TARGETS camera_test DESTINATION /usr/bin)
~
I can create the image with this code and there is no problem, but when I try to execute it, I always get the same error:
~# camera_test 0
Trying camera at port 0
Floating point exception
There is no other error message and the code runs in my machine (native compilation) without any problem. Did someone experience this problem before? I had to patch the kernel in order to change the camera driver from mt9p032 to the mt9v032 (Phytec cameras) but I don't think this should have anything to do with it.... However, in the dmesg output I found this line:
coda 2040000.vpu: Direct firmware load for v4l-coda960-imx6q.bin failed with error -2
Could it be the problem? In that case, how can it be solved?
Best regards,
Juan
