OpenCV integration

i'll try to update drivers and rebuild opencv

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Added after 19 minutes:

I think i find some problem. When i was trying to install camdrivers - for acer crystal eye - i can't, because in compiling i take error - http://www.linuxtv.org/ driver don't know my linux-distro - Linux Mint,based od ubuntu. so maybe without this driver opecv can't find cameras...

Although this is pretty old I have some suggestions for using OpenCV with Qt. First of all get rid of this old c style code you are using.

Since OpenCV2 there's a new interface for c++ code. You should use cv::Mat and Videocapture and so on. You can use the cv::Mat constructor like cv::Mat(IplImage) for direct converion. The new Interface is fully compatible.

This will not solve your problems for sure, but it's a good start to get an up to date and clean code base first before trying to fix things.

Always use cmake for building OpenCV from source. This saves you a lot of trouble.

If your OpenCV Setup ist correct, check out my Tutorial on this and tell me what you think please, cuz it's my first.

I explain how to setup a Qt Project with OpenCV 2.3 in Mac OSX, Unix and Windows.

I don't use any cvNamedWindow or QLabel for output of the frames because it sucks and it's slow.

Instead I use a custom Widget which inherits from QtGLWidget. It renders the OpenCV Output using OpenGL 2D-Texture Mapping and handles dynamic resizing in the GUI and everything.

Check it out here (http://br1ckb0x.fancy-bits.net/blog/?p=736) and don't forget to post any problems or suggestions. I hope it will help you guys.

Can you post some working code with qt and opencv2 ?

I installed Gentoo for my laptop, install qt, opencv. trying to run this program and get "assertion failed". Again...Check my camera:

Quote:

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core@localhost ~ $ v4l-info

### v4l2 device info [/dev/video0] ###
general info
VIDIOC_QUERYCAP
driver : "uvcvideo"
card : "CNF7017"
bus_info : "usb-0000:00:1a.7-6"
version : 1.1.0
capabilities : 0x4000001 [VIDEO_CAPTURE,STREAMING]

standards

inputs
VIDIOC_ENUMINPUT(0)
index : 0
name : "Camera 1"
type : CAMERA
audioset : 0
tuner : 0
std : 0x0 []
status : 0x0 []

video capture
VIDIOC_ENUM_FMT(0,VIDEO_CAPTURE)
index : 0
type : VIDEO_CAPTURE
flags : 0
description : "YUV 4:2:2 (YUYV)"
pixelformat : 0x56595559 [YUYV]
VIDIOC_G_FMT(VIDEO_CAPTURE)
type : VIDEO_CAPTURE
fmt.pix.width : 640
fmt.pix.height : 480
fmt.pix.pixelformat : 0x56595559 [YUYV]
fmt.pix.field : NONE
fmt.pix.bytesperline : 1280
fmt.pix.sizeimage : 614400
fmt.pix.colorspace : SRGB
fmt.pix.priv : 0

controls
VIDIOC_QUERYCTRL(BASE+0)
id : 9963776
type : INTEGER
name : "Brightness"
minimum : -64
maximum : 64
step : 1
default_value : 0
flags : 0
VIDIOC_QUERYCTRL(BASE+1)
id : 9963777
type : INTEGER
name : "Contrast"
minimum : 0
maximum : 95
step : 1
default_value : 0
flags : 0
VIDIOC_QUERYCTRL(BASE+2)
id : 9963778
type : INTEGER
name : "Saturation"
minimum : 0
maximum : 128
step : 1
default_value : 75
flags : 0
VIDIOC_QUERYCTRL(BASE+3)
id : 9963779
type : INTEGER
name : "Hue"
minimum : -40
maximum : 40
step : 1
default_value : 4
flags : 0

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So what's wrong?

how to display multi camera opencv in QLabel QT.
Plz help :)

I edit QtOpenCV project example.I built on PC and for KIT ARM is OK.When I copy file to KIT,telnet to KIT and run with the same error.

Code:

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[root@FriendlyARM /myApp]# chmod a+rwx QtOpenCV
[root@FriendlyARM /myApp]# ./QtOpenCV -qws
QtOpenCV: main.cpp:13: int main(int, char**): Assertion `camera' failed.
Aborted

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======================================
main.cpp

Code:

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#include <opencv/cv.h>
#include <opencv/highgui.h>
#include <stdio.h>
#include <assert.h>
#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>
#include "QOpenCVWidget.h"
#include "MyCameraWindow.h"
 
int main(int argc, char **argv) {
    CvCapture * camera =  cvCaptureFromCAM(-1);
    assert(camera);
    IplImage * image=cvQueryFrame(camera);
    assert(image);
 
    printf("Image depth=%i\n", image->depth);
    printf("Image nChannels=%i\n", image->nChannels);
 
    QApplication app(argc, argv);
    MyCameraWindow *mainWin = new MyCameraWindow(camera);
    mainWin->setWindowTitle("OpenCV --> QtImage");
    mainWin->show();    
    int retval = app.exec();
 
    cvReleaseCapture(&camera);
 
    return retval;
}

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==================================================
Can everybody help me run App use Opencv on KIT ARM
Thanks

I too try cvCreateCameraCapture() function but same this error!

Anybody help?

What exactly do you expect us to do? Your program fails on some OpenCV call.