webcam

问题 I am attempting to use OpenCV to grab frames from a webcam and display them in a window using SFML. VideoCapture returns frames in OpenCV's Mat format. To display the frames, SFML requires a 1D array of pixels in its uint8 format, which (as far as I can tell) is interchangeable with uchar. This array is expected to represent 32 bits per pixel RGBA. So, I have a uchar array, and I'm looping over the Mat data and copying each pixel: VideoCapture cap(0); Mat frame; cap >> frame; uchar* camData =

问题 I'm tryin to take a picture in my webcam, I'm just starting to use JMF I just need to take a picture with a webcam and save it to a specified directory I'm using this code import java.awt.Component; import javax.media.Manager; import javax.media.MediaLocator; import javax.media.Processor; import javax.media.protocol.FileTypeDescriptor; import javax.swing.JFrame; import javax.swing.JLabel; /* * To change this template, choose Tools | Templates * and open the template in the editor. */ /** * *

问题 I'm tryin to take a picture in my webcam, I'm just starting to use JMF I just need to take a picture with a webcam and save it to a specified directory I'm using this code import java.awt.Component; import javax.media.Manager; import javax.media.MediaLocator; import javax.media.Processor; import javax.media.protocol.FileTypeDescriptor; import javax.swing.JFrame; import javax.swing.JLabel; /* * To change this template, choose Tools | Templates * and open the template in the editor. */ /** * *

问题 Please help. Rather than a actual question, this is a questions asking for feedback, suggestion and recommendation on what is a webcam good enough for image processing. I need a reasonable low light, self-focus camera that has enough depth of field to capture image. Digital cameras are too bulky for use in my application and also need software to interface to an embedded processor, which I wish to avoid. The image segmentation I am doing is quite tough in my opinion, requires edge detection,

问题 So I'm working on a zynq z7000 card and I made a Linux Kernel on it. I put a Linaro as a Root File System. I managed to boot the card however I can only use mouse and keyboard usb devices. I tried webcam and flash drives but they are not working. when I use : lsusb I get the webcam device ... Bus 001 Device 005: ID 046d:0805 Logitech, Inc. Webcam C300 However when I try ls /dev/video* I get ls: cannot access /dev/video*: No such file or directory I've used these configurations to build my

问题 I am currently work on a project that capture video from webcam and send the encoded stream via UDP to do a real time streaming. #include "opencv2/highgui/highgui.hpp" #include <iostream> using namespace cv; using namespace std; int main(int argc, char* argv[]) { VideoCapture cap(0); // open the video camera no. 0 double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video

问题 So I have 2 diffrent apps that use web-cameras (on Windows) I created tham bouth but I need them to be separate, stand alone apps. I want tham bouth to be capable to capture from same camera. What should I add to my capturing OpenCV code? 回答1: You can't. Only one application can access any device at a time - even with common I/O devices like hard disks. If multiple applications could access a device simultaneously, it would be confused whose instructions to follow. You can use SplitCam,

问题 How to use MediaCapture or DirectShow API in MS-Access? As WIA is outdated for cameras. WIA examples exist but not MediaCapture or DirectShow I almost never use VBA but need to capture a photo using Access 2013. I have found a .net example by MS that looks like it will do want I need, how to get it to work in VBA in Access? ' Using Windows.Media.Capture.CameraCaptureUI API to capture a photo Dim dialog As New CameraCaptureUI() Dim file As StorageFile = Await dialog.CaptureFileAsync

问题 In my app, I am using webcam functionality. But if user doesn't have webcam plugin installed in his system then I want to prompt a message to him. There are 2 things: webcam plugin is not installed webcam plugin is installed, but webcam is not present. So I want the first condition code in JavaScript EDIT I am using this code for finding whether webcam is present or not $('#cambg').webcam({ width : 320, height : 240, mode : 'callback', swffile : '/flash/libraries/jquery/webcam/jscam_canvas

问题 I am using JMF to operate my web cam.My usb webcam works perfectly with JMF, I used it in JMStudio however,when I make this call from my java code deviceListVector = CaptureDeviceManager.getDeviceList( null ); my USB "webcam" is detected however when i am trying to detect webcam on my laptop it is not detecting any device. How can I properly detect the webcam of laptop, and its formats, from JMF API? 回答1: Make sure that the system you're using it on contains all the required files eg On