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2020-02-10 02:59:39 -0600
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2020-01-26 01:27:01 -0600
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2018-12-18 04:19:30 -0600
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2018-06-29 20:02:42 -0600
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2016-12-22 23:42:03 -0600
| commented answer | [OpenCV]How to detect and connect camera automatically Thank you for your answer.
But if I connect the device like this:not device --->connect device---->disconnect device-->connect device
Could you give me some advices? |
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2016-12-14 01:58:58 -0600
| asked a question | [OpenCV]How to get the number of camera - How to get the total number of camera?
The following is my code, but i find that it will make the memory leak int CvCaptureCAM_DShow::getDeviceCount(){
int deviceNumber = VI.listDevices(true);
return deviceNumber;}
int cvGetDeviceCount_DShow(){
CvCaptureCAM_DShow* capture = new CvCaptureCAM_DShow;
int deviceCount = capture->getDeviceCount();
delete capture;
capture = NULL;
return deviceCount;
} |
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2016-12-09 19:19:56 -0600
| commented answer | [OpenCV]How to get the resolution of camera I think this is a good idea to solve this question.Thank you. |
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2016-12-08 20:38:37 -0600
| asked a question | [OpenCV]How to get the resolution of camera How to get the resolution of camera?Can somebody give me some suggestion.
Only i can do is the following,but it takes too much time to get the resolution. void GetResolution( const int& countOfCamera, resolution_t (&resoulationTemp)[MAX_RESOLUTION] ){
VideoCapture *pVideoCaptures[MAX_CAMERA] = {NULL};
bool ret1 = false;
bool ret2 = false;
for ( int j=0; j<countOfCamera; ++j ) {
pVideoCaptures[j] = new VideoCapture(j);
/*==========================================================================
*If we don't do this, we will not open the Camera correctly
===========================================================================*/
pVideoCaptures[j]->set( CV_CAP_PROP_FRAME_WIDTH, defaultResolution.width );
pVideoCaptures[j]->set ( CV_CAP_PROP_FRAME_HEIGHT, defaultResolution.height );
}
for ( int i=0; i<MAX_RESOLUTION; ++i ) {
for ( int j=0; j<countOfCamera; ++j ) {
ret1 = pVideoCaptures[j]->set( CV_CAP_PROP_FRAME_WIDTH, resolutions[i].width );
ret2 = pVideoCaptures[j]->set ( CV_CAP_PROP_FRAME_HEIGHT, resolutions[i].height );
if ( !(ret1 && ret2) ) { //The resolution is not OK
break; //Check the next resolution
} else if ( j == ( countOfCamera -1 ) ) { //The resolution is OK for all camera,then store it.
resoulationTemp[i].width = resolutions[i].width;
resoulationTemp[i].height = resolutions[i].height;
} else {
//Do nothing
}
}
}
for ( int j=0; j<countOfCamera; ++j ) //Release the memory
{
pVideoCaptures[j]->release();
delete pVideoCaptures[j];
pVideoCaptures[j] = NULL;
}
} |
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2016-12-07 20:14:54 -0600
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2016-12-06 20:24:03 -0600
| asked a question | [OpenCV]How to detect and connect camera automatically How can i detect and connect camera automatically? |
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2016-11-25 01:56:58 -0600
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2016-11-25 01:27:09 -0600
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2016-11-24 21:41:43 -0600
| asked a question | [Opencv2.4.13]Two cameras hot plug, can't open the second camera working environment:Opencv2.4.13, VS2008, Camera(A and B) my question is: Connect A ----> Connect B: A,B both can be opened;Connect B ----> Connect A: B can be opened,but A can't. - following is my code: when connect first camera:i use code VideoCapture
videoCapture(0) when connect second camera:i use code VideoCapture videoCapture(1) - B connect firstly then A.I check the opecv's code,i find that:
when i call the
videoCapture(1), the response of videoInput::getDevice
is Camera B, not Camera A. It is so strange. - Usb device number can be dynamic changed.
When I connect B, the B's device NO. is 0. Then I connect A, B's device change to 1 and A's device NO. is 0.
I think Opencv have not take this situation into account.Can somebody give me suggestion?
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2016-11-21 20:13:25 -0600
| commented question | [OpenCV2.14.13]Can't open the second camera Thank you, i have found that these camera use the same usb controller.If I want to open these cameras, i have to decrease the resolution. Below is the code that i can open the two camera:int _tmain(int argc, _TCHAR* argv[]) { VideoCapture camera0(1); camera0.set(CV_CAP_PROP_FRAME_WIDTH,432); camera0.set(CV_CAP_PROP_FRAME_HEIGHT,240); VideoCapture camera1(0); camera1.set(CV_CAP_PROP_FRAME_WIDTH,432); camera1.set(CV_CAP_PROP_FRAME_HEIGHT,240); return 0; } |
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2016-11-21 19:21:29 -0600
| commented question | [OpenCV2.14.13]Can't open the second camera @Micka Thank you for your answer. Yes, i find that they use the same usb controller. |
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2016-11-21 04:02:39 -0600
| asked a question | [OpenCV2.14.13]Can't open the second camera - The work environment is : OpenCV 2.4.13, VS2008, Two different kind of usb camera.
I can't open the sencond camera when using the following code int _tmain(int argc, _TCHAR* argv[]){
VideoCapture capture(0);
if( !capture.isOpened() )
std::cout << "Capture0 can't be opened\n" << std::endl;
VideoCapture capture1(1);
if( !capture1.isOpened() )
std::cout << "Capture1 can't be opened\n" << std::endl;
return 0;}
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2016-11-21 00:55:08 -0600
| asked a question | [OpenCV 2.4.13]Only one camera can work currently The Question is: The work environment is : OpenCV 2.4.13, VS2008, Two different kind of usb camera.
Use the following code, I find that only one cammera can grap the frame.
The output is:
Searching for cameras IDs...
Testing driver CV_CAP_MIL...Nothing !
Testing driver CV_CAP_VFW...Nothing !
Testing driver CV_CAP_FIREWARE...Nothing !
Testing driver CV_CAP_STEREO...Nothing !
Testing driver CV_CAP_QT...Nothing !
Testing driver CV_CAP_UNICAP...Nothing !
Testing driver CV_CAP_DSHOW... CV_CAP_DSHOW+0 opens: OK grabs: OK
CV_CAP_DSHOW+1 opens: OK grabs: FAIL
Testing driver CV_CAP_MSMF...Nothing !
Testing driver CV_CAP_PVAPI...Nothing !
Testing driver CV_CAP_OPENNI...Nothing !
Testing driver CV_CAP_OPENNI_ASUS...Nothing !
Following is the code : // Camera_21413.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <vector>
#include "opencv.hpp"
#include "core/core.hpp"
#include "highgui/highgui.hpp"
using namespace cv;
using namespace std;
bool EnumerateCameras(vector<int> &camIdx)
{
camIdx.clear();
struct CapDriver{
int enumValue; string enumName; string comment;
};
// list of all CAP drivers (see highgui_c.h)
vector<CapDriver> drivers;
CapDriver temp = {CV_CAP_MIL, "CV_CAP_MIL", "MIL proprietary drivers"};
drivers.push_back( temp );
temp.enumValue = CV_CAP_VFW;
temp.enumName = "CV_CAP_VFW";
temp.comment = "platform native";
drivers.push_back( temp );
temp.enumValue = CV_CAP_FIREWARE;
temp.enumName = "CV_CAP_FIREWARE";
temp.comment = "IEEE 1394 drivers";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_FIREWARE, "CV_CAP_FIREWARE", "IEEE 1394 drivers" });
temp.enumValue = CV_CAP_STEREO;
temp.enumName = "CV_CAP_STEREO";
temp.comment = "TYZX proprietary drivers";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_STEREO, "CV_CAP_STEREO", "TYZX proprietary drivers" });
temp.enumValue = CV_CAP_QT;
temp.enumName = "CV_CAP_QT";
temp.comment = "QuickTime";
drivers.push_back( temp );
// drivers.push_back({ CV_CAP_QT, "CV_CAP_QT", "QuickTime" });
temp.enumValue = CV_CAP_UNICAP;
temp.enumName = "CV_CAP_UNICAP";
temp.comment = "Unicap drivers";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_UNICAP, "CV_CAP_UNICAP", "Unicap drivers" });
temp.enumValue = CV_CAP_DSHOW;
temp.enumName = "CV_CAP_DSHOW";
temp.comment = "DirectShow (via videoInput)";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_DSHOW, "CV_CAP_DSHOW", "DirectShow (via videoInput)" });
temp.enumValue = CV_CAP_MSMF;
temp.enumName = "CV_CAP_MSMF";
temp.comment = "Microsoft Media Foundation (via videoInput)";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_MSMF, "CV_CAP_MSMF", "Microsoft Media Foundation (via videoInput)" });
temp.enumValue = CV_CAP_PVAPI;
temp.enumName = "CV_CAP_PVAPI";
temp.comment = "PvAPI, Prosilica GigE SDK";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_PVAPI, "CV_CAP_PVAPI", "PvAPI, Prosilica GigE SDK" });
temp.enumValue = CV_CAP_OPENNI;
temp.enumName = "CV_CAP_OPENNI";
temp.comment = "OpenNI (for Kinect)";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_OPENNI, "CV_CAP_OPENNI", "OpenNI (for Kinect)" });
temp.enumValue = CV_CAP_OPENNI_ASUS;
temp.enumName = "CV_CAP_OPENNI_ASUS";
temp.comment = "OpenNI (for Asus Xtion)";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_android, "CV_CAP_ANDROID", "Android" });
temp.enumValue = CV_CAP_ANDROID_BACK;
temp.enumName = "CV_CAP_ANDROID_BACK";
temp.comment = "Android back camera";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_ANDROID_BACK, "CV_CAP_ANDROID_BACK", "Android back camera" });
temp.enumValue = CV_CAP_ANDROID_FRONT;
temp.enumName = "CV_CAP_ANDROID_FRONT";
temp.comment = "Android front camera";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_ANDROID_FRONT, "CV_CAP_ANDROID_FRONT", "Android front camera" });
temp.enumValue = CV_CAP_XIAPI;
temp.enumName = "CV_CAP_XIAPI";
temp.comment = "XIMEA Camera API";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_XIAPI, "CV_CAP_XIAPI", "XIMEA Camera API" });
temp.enumValue = CV_CAP_AVFOUNDATION;
temp.enumName = "CV_CAP_AVFOUNDATION";
temp.comment = "AVFoundation framework for iOS";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_AVFOUNDATION, "CV_CAP_AVFOUNDATION", "AVFoundation framework for iOS" });
temp.enumValue = CV_CAP_GIGANETIX;
temp.enumName = "CV_CAP_GIGANETIX";
temp.comment = "Smartek Giganetix GigEVisionSDK";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_GIGANETIX, "CV_CAP_GIGANETIX", "Smartek Giganetix GigEVisionSDK" });
temp.enumValue = CV_CAP_INTELPERC;
temp.enumName = "CV_CAP_INTELPERC";
temp.comment = "Intel Perceptual Computing SDK";
drivers.push_back( temp );
//drivers.push_back({ CV_CAP_INTELPERC, "CV_CAP_INTELPERC", "Intel Perceptual Computing SDK" });
std::string winName ...
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