I recently started some OpenCV programming on OSX (just using text editor and compiling in terminal). I found program on the internet that is very useful to me but can't seem to run it.
This is the code:
#include <stdio.h>
#include "cv.h"
#include <highgui.h>
#include <iostream>
#include <cstdio>
using namespace std;
int widthU;
int heightU;
int xU = 0;
int yU = 0;
int main(int argc, char *argv[])
{
IplImage *imgPicThres, *imgPicInput;
imgPicInput = cvLoadImage("bitmap.png", -1);
imgPicThres = cvCreateImage(cvSize(imgPicInput->width, imgPicInput->height), IPL_DEPTH_8U, 1);
cvNamedWindow("Input picture", 0);
cvNamedWindow("Thres picture", 0);
//Picture
//cvThreshold(imgPicInput,imgPicThres,100,255,CV_THRESH_BINARY);
cvAdaptiveThreshold(imgPicInput, imgPicThres,255,CV_ADAPTIVE_THRESH_MEAN_C, CV_THRESH_BINARY,75,10);
cvShowImage("Input picture", imgPicInput);
cvShowImage("Thres picture", imgPicThres);
while (true)
{
int c = cvWaitKey(10);
if(c==27)
break;
}
cvDestroyWindow("Input picture");
cvDestroyWindow("Thres picture");
return 0;
}
And this is the error that I get:
OpenCV Error: Assertion failed (src.size == dst.size && src.type() == dst.type()) in cvAdaptiveThreshold, file /opt/local/var/macports/build/_opt_mports_dports_graphics_opencv/opencv/work/opencv-2.4.5/modules/imgproc/src/thresh.cpp, line 873
libc++abi.dylib: terminate called throwing an exception
Abort trap: 6
I tried to change this line
ImgPicThres = cvCreateImage(cvSize(imgPicInput->width, imgPicInput->height), IPL_DEPTH_8U, 1);
into
ImgPicThres = cvCreateImage(cvGetSize(imgPicInput), IPL_DEPTH_8U, 1);
with no luck.
OpenCV is installed via Macports and is running the latest version. Any help would be appreciated. Thanks!
imgPicInput = cvLoadImage("bitmap.png",CV_LOAD_IMAGE_GRAYSCALE);
to ensure that the image you read is actually grayscale.
Additionally to suggestion from perfanoff, I'd rather clone image rather then creating it.
imgPicThres = cvCloneImage(imgPicInput );
I have found the answer but forgot to mention it. As the error says imgPicInput and imgPicThres are not of the same size and type. Also I was supposed to watch after the image channels which I didn't.
Related
I wrote some lines of code to simply read and write an image and it was working a few days ago, but now Visual Studio gives these errors: "1>Done building project "Lab1_PI.vcxproj" -- FAILED." and it says it was "unable to start the program" and that the system cannot find the file specified.
I also tried to add add _CRT_SECURE_NO_DEPRECATE and _CRT_SECURE_NO_WARNINGS via right-click project->C/C+±>Preprocessor->Preprocessor Definitions, but nothing changed.
Also, here's my code, but it is correct since it was working a few days ago:
#include <iostream>
#include <string>
#include "opencv2\core.hpp"
#include "opencv2\highgui\highgui.hpp"
#include "opencv2\imgproc\imgproc.hpp"
using namespace cv;
using namespace std;
int main(int arc, const char** argv) {
string imgPath = argv[1];
string img2Path = argv[2];
cv::Mat img = imread(imgPath);
if (!img.data) {
cout << "error:no image" << endl;
return -1;
}
imshow("flower image (color)", img);
Mat img2;
cvtColor(img, img2, COLOR_RGB2GRAY);
imwrite(img2Path, img2);
imshow("flower image (grey)", img2);
waitKey(0);
}
I would be really grateful if someone could help me fix this problem because it stops me from using Visual Studio and I really need it for a project!
I am new to C++ and i am getting error like
error: no matching function for call to 'FaceDetector::FaceDetector(std::__cxx11::string)'
FaceDetector fd(string(DEFAULT_CASCADE_PATH));
and i am attaching my code and error log how to fix this please guide me
#define DEFAULT_CASCADE_PATH "cascades/haarcascade_frontalface_default.xml"
#define ORIGINALS_LIST "obama_raw/list"
#define OUTPUT_DIR "obama_faces"
#define OUTPUT_LIST "list"
#define FACE_SIZE Size(150,150)
#include <cstdlib>
#include <fstream>
#include "cv.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "FaceDetector.h"
using namespace std;
using namespace cv;
void read_input_list(const string &list_path, vector<Mat> &images) {
ifstream file(list_path.c_str());
string path;
while (getline(file, path)) {
images.push_back(imread(path));
}
}
int main(int argc, char** argv) {
FaceDetector fd(string(DEFAULT_CASCADE_PATH));
vector<Mat> raw_faces;
ofstream out_list(format("%s/%s", OUTPUT_DIR, OUTPUT_LIST).c_str());
read_input_list(string(ORIGINALS_LIST), raw_faces);
int img_c = 0; //images counter
//now detect the faces in each of the raw images:
for (vector<Mat>::const_iterator raw_img = raw_faces.begin() ; raw_img != raw_faces.end() ; raw_img++){
vector<Rect> faces;
//detect faces in the image (there should be only one):
fd.findFacesInImage(*raw_img, faces);
//cut each face and write to disk:
for (vector<Rect>::const_iterator face = faces.begin() ; face != faces.end() ; face++){
int edge_size = max(face->width, face->height);
Rect square(face->x, face->y, edge_size, edge_size);
Mat face_img = (*raw_img)(square);
//resize:
resize(face_img, face_img, FACE_SIZE);
//write to disk:
string face_path = format("%s/%d.jpg", OUTPUT_DIR, img_c++);
imwrite(face_path,face_img);
out_list << face_path << endl;
}
}
out_list.close();
return 0;
}
and i am attaching my error log.Please can any one help.
Thanks in advance
Error : https://i.stack.imgur.com/RZXXK.jpg
From GCC 5, A new ABI is enabled by default. In that new ABI, std::__cxx11 namesapce was introduced.
According to your error message, It seems that your program and OpenCV library you want to link with were build with different GCC version, which made incompatible binary.
For more information, you can read the following page:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html
As I am completely new to OpenCV, I tried following a tutorial to capture video from a webcam. I used the following code:
#include "opencv2\opencv.hpp"
#include <stdint.h>
using namespace cv;
using namespace std;
int main(int argv, char** argc) {
Mat frame;
VideoCapture vid(0); //0 if we only have one camera
if (!vid.isOpened()) { //check camera has been initialized
cout << "ERROR: Cannot open the camera";
return -1;
}
while (vid.read(frame)) {
imshow("webcam", frame);
if (waitKey(30) >= 0) break;
}
return 0;
}
When I run the program, a window that shows the video feed opens, but it then almost immediately closes. I get this snippet from the Debug output:
SETUP: Device is setup and ready to capture.
Event: Code: 0x0d Params: 0, 0
Event: Code: 0x0e Params: 0, 0
Exception thrown at 0x000007FEFCBAA06D in test.exe: Microsoft C++ exception: cv::Exception at memory location 0x000000000026EB10.
SETUP: Disconnecting device 0
I don't know what could be wrong with my code or even how to begin debugging this. Any advice? Thank you!
When I run the facerec_eigenfaces demo program from OpenCV 3.1 I receive an unhandled exception:
OpenCV Error: Assertion failed (0 <= i && i < (int)v.size()) in cv::_InputArray::getMat_
This follows a call to _InputArray::getMat(int). I reduced the facerec_eigenfaces program to the following which gives the same error. (I also tried other binary pgm files with the same result.) Can anyone suggest what may be wrong?
#include "opencv2/core.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include <vector>
int main(int argc, char *argv[])
{
auto m = cv::imread("../att_faces/s1/1.pgm", 0);
std::vector<cv::Mat> imgs;
imgs.push_back(m);
cv::InputArrayOfArrays ia(imgs);
ia.getMat(0); // assertion here
return 0;
}
I was trying to save images from a video file but It couldn't save any image in my hard drive. I compiled following program without errors.
#include <stdio.h>
#include <stdlib.h>
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
int main(int argc, char* argv[]) {
int c=1;
IplImage* img=0;
IplImage* small;
IplImage* small=new IplImage(inputArray);
char buffer[1000];
CvCapture* cv_cap=cvCaptureFromFile("test.avi");
cvNamedWindow("Video",CV_WINDOW_AUTOSIZE);
while(1) {
img=cvQueryFrame(cv_cap);
cvShowImage("Video",img);
small = cvCreateImage(cvSize(img->width/2,img->height/2), 8, 3);
sprintf(buffer,"C:/image%u.jpg",c);
c++;
if (cvWaitKey(100)== 27) break;
}
cvDestroyWindow("Video");
return 0;
}
I am using a 2.3.1 openCV library and Visual Studio 2010.
How can I save the image from a video file?
I have also tried this code,above program code are something wrong.please see following program code.After i adding following code ,also there was a same problem.
cvSaveImage(buffer,img);
Corrected program is shown below.please see this and tell me what i did wrong.but there is not compile error.after i run the program it doesn't save any image.
#include"stdafx.h"
#include<cv.h>
#include<highgui.h>
#include<cxcore.h>
int main(int argc, char* argv[]) {
int c=1;
IplImage* img=0;
char buffer[1000];
CvCapture* cv_cap=cvCaptureFromCAM(-1);
cvNamedWindow("Video",CV_WINDOW_AUTOSIZE);
while(1) {
img=cvQueryFrame(cv_cap);
cvShowImage("Video",img);
sprintf(buffer,"D:/image%u.jpg",c);
cvSaveImage(buffer,img);
c++;
if (cvWaitKey(100)== 27) break;
}
cvDestroyWindow("Video");
return 0;
}
can you tell me how to save a image .above program doesn't save any images.please give me your suggestions.thank you.
You forgot to actually save the image:
cvSaveImage(buffer ,img);
Also, the following is redundant:
IplImage* small; // <-- you don't need this
IplImage* small=new IplImage(inputArray);
Don't know if you solved the problem or not. if not you can use imwrite("test.jpg",img); to save an image,
here is an example-
while(1) {
img=cvQueryFrame(cv_cap);
cvShowImage("Video",img);
imwrite("test.jpg",img);
}