Manipulating Webcam capture??????

Hi
I have successfully managed to capture, transmit, receive and display (using an applet) a webcam capture using jmf.
However I want to let the user to put their mouse on the applet and be able to scroll around, zoom in and out etc..
Any suggestions?

dear Fergus
My main objective is to capture / preview video using an applet and then capture a still image. save this still image to a file in users machine and then upload the file to the server at a specified folder.
this applet is a part of Student Registration system and to generate ID cards for students.
can you help me in this regards ? I have catagorized the requirements and other details. I am pasting the same here.
Video Capture Module
Objective: To capture a still image from a web page and Upload the image to specified folder on the server.
Technologies to be used: JAVA Applets, HTML & Servelets.
Synopsis: This application basically involves use of Java Media Framework. The primary objectives of this module are categorized according to the functionality.
1)     Detect the video capture device on the users machine.
2)     Preview the Live Video from the Detected Compatible Video Capture device.
3)     Ask for user to click to take a snap and save the file in users machine at some temporary location with some unique file name.
4)     Upload the file to the server at the specified path.
There are a few constraints to this application. These are identified in following according to severity of the constraint
1)     Minimal download time for the applet and supporting files.
2)     Browser compatibility with Internet Explorer 4.0 upward as well as Netscape Navigator 4.0 upward.
3)     User interface flexibility and easy to plug-in to the main module.
4)     Reusability of this module for other purposes.
There are few technological hurdles involved in doing this. These are stated below in order of severity.
1)     Detecting the Capture Device on users machine.
2)     User should not be asked to install Java Media Studio on his / her machine. Whatever the files are required should be loaded at the runtime.
3)     Making the applet compatible with both the browser technologies.
Following assumptions are being made
1)     The browsers are capable to handle applets i.e. the JVM & Java Plug-in are already installed.
2)     Video capture device Drivers are installed in the machine and the Camera is plugged in to the system.
The assumptions are prerequisite and must be met.
Details of the Sub Modules:
SM-1: Detect Video capture Device in users machine.
This involves following steps
1)     Initialize the applet and get permissions to access the system resources such as capture devices and other input devices. Having the signed applet with the required premissions can do this.
2)     Once we have the permission to access the devices we can scan various input devices and store the information in some temporary place such as cookie.
3)     If Compatible Video Capture device is found then query the Video capture device.
4)     If the Video capture device is not found then prompt user to install the Video capture device and revert back to starting the applet again.
5)     Check for the Device Capabilities. Compare that with our requirements.
6)     If things are ok then we can proceed to next step else go back to step 4.
7)     Save the device info for the future use possibly in a cookie.
SM-2: Preview the Live Video from the Detected Compatible Video Capture device.
This involves following steps
1)     Read the information from the cookie.
2)     Initialize the viewer for the Live Video.
3)     Present the live video.
4)     As a tool tip, we should suggest the user to focus the camera and adjust the camera lens to get a sharp image.
SM-3: Ask for user to click to take a snap and save the file in users machine at some temporary location with some unique file name.
This involves following steps
1)     Ask user to look in to camera straight. Not to blink eyes while picture is being taken.
2)     User should then click the snap button. As a useful tip we may also provide a keyboard short cut to capture the still image.
3)     Once the image is captured show the still image instead of the live video.
4)     Give an option to user to recapture the still image.
5)     If user feels his / her image has been satisfactorily captured.
6)     Ask for confirmation to save and upload the image to server.
SM-4: Upload the file to the server at the specified path.
This involves following steps
1)     Check for user authentication.
2)     Check for file name.
3)     Check for file size.
4)     If all above is ok then upload the image to server at the specified path.
regards
Virendra

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I search the forum, but can't find any answer !
I'm trying to capture a webcam using JMF Performance Pack on XP64.
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import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.util.*;
import javax.media.control.*;
import javax.media.protocol.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;
import javax.imageio.ImageIO;
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I have a question posted about this code, slightly modified in this thread:
http://forum.java.sun.com/thread.jspa?threadID=5310154&tstart=0
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Hi,
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where there is a few links to other ways using DirectShow and maybe more.
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End Sub
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Webcam capture under MacOS

Hi,
is is possible to capture video from a webcam under MacOS? Under Windows and Linux it works finde with their performance packs, but under MacOS I have to use the "Cross-platform Java" version...
Thanks
Alexander Miehlke

enderwiggin wrote:
So it turns out that so many of these cameras update at such a slow rate (or are dead/static) that the system (which only captures most of these cameras once every 30 minutes) does end up downloading duplicates. That does surprise me since I would have expected thermal noise to change some pixels.
When I originally wrote this I had it saving the images to disk and then checking them, but it was almost impossible to delete the file successfully if the image was determined to be a duplicate. I don't understand this. I don't see how having a duplicate file can in any way influence a 'delete'.
>
Rather than save in a ByteArrayOutputStream why not just compare the bytes in the buffer just read with those on the disk. I'm up for trying anything at this point, but I'm having a hard time figuring out how to go about this.Since after every buffer read you know how many bytes have just been read, using a RandomAccess file you can read that number from the file and compare them. If they are different then you change to just writing the new byte directly using the RandomAccess file.
Ideally, what I need is to read the image into just an array of bytes that I can compare against the last image and then write to disk. Which, as you are finding out, does not scale. Reading the whole of a file into memory is rarely a good idea.
I'm turning around and passing the array of bytes to another method by way of out.toByteArray() to do the check. By the way I'm limiting the number of simultaneous captures to 10, which works well it seems for most of the program's operation. So put the requests for capture into a priority queue and then process the queue using a finite pool of tasks.
>
As a note, I've already tried bumping up the JVM's allocated memory with no luck.... although that would've been a pretty poor long term solution anyways.Yep. If I have to allocate more memory then my solution is poor.

Webcam Capture AS2 CS5

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[CODE]import flash.display.BitmapData;
import com.adobe.images.JPGEncoder;
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save_mc.alpha = 10;
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urlLoader.load(saveJPG);
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warn.visible = true;
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navigateToURL(new URLRequest("images/"), "_blank");
warn.visible = false;
warn.visible = false;[/CODE]

enderwiggin wrote:
So it turns out that so many of these cameras update at such a slow rate (or are dead/static) that the system (which only captures most of these cameras once every 30 minutes) does end up downloading duplicates. That does surprise me since I would have expected thermal noise to change some pixels.
When I originally wrote this I had it saving the images to disk and then checking them, but it was almost impossible to delete the file successfully if the image was determined to be a duplicate. I don't understand this. I don't see how having a duplicate file can in any way influence a 'delete'.
>
Rather than save in a ByteArrayOutputStream why not just compare the bytes in the buffer just read with those on the disk. I'm up for trying anything at this point, but I'm having a hard time figuring out how to go about this.Since after every buffer read you know how many bytes have just been read, using a RandomAccess file you can read that number from the file and compare them. If they are different then you change to just writing the new byte directly using the RandomAccess file.
Ideally, what I need is to read the image into just an array of bytes that I can compare against the last image and then write to disk. Which, as you are finding out, does not scale. Reading the whole of a file into memory is rarely a good idea.
I'm turning around and passing the array of bytes to another method by way of out.toByteArray() to do the check. By the way I'm limiting the number of simultaneous captures to 10, which works well it seems for most of the program's operation. So put the requests for capture into a priority queue and then process the queue using a finite pool of tasks.
>
As a note, I've already tried bumping up the JVM's allocated memory with no luck.... although that would've been a pretty poor long term solution anyways.Yep. If I have to allocate more memory then my solution is poor.

Webcam capture & save as JPEG image

Hi,
I'm creating an application to capture image via webcam using directshow. I've managed to capture the stream using samplegrabber.
the problem is when I save the grabbed image to a JPEG, the colors are incorrect.
provided the link of the captured image from the webcam http://www.filefreak.com/pfiles/44160/test2.jpg
the right hand side of the image should be brown colored, not blue as in the picture.
I've also test to save as a bmp image, the color are ok.
this is how i save the grabbed webcam frame into a jpeg file
sampleGrabber->GetCurrentBuffer(&bufferSize, (long*)frameBuffer);
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struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
JSAMPLE * image_buffer=NULL;
FILE * outfile;
JSAMPROW row_pointer[1];
int row_stride;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
if ((outfile = fopen("test2.jpg", "wb")) == NULL) {
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image_buffer = (unsigned char*)frameBuffer;
jpeg_stdio_dest(&cinfo, outfile);
cinfo.image_width = videoWidth;
cinfo.image_height = videoHeight;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, 255, TRUE );
jpeg_start_compress(&cinfo, TRUE);
row_stride = videoWidth * 3;
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jpeg_finish_compress(&cinfo);
fclose(outfile);
jpeg_destroy_compress(&cinfo);
//end save jpeg
Thanks.
Regards

Hi,
Thanks
for participating on the MSDN Forum! I think your question is mainly related
with DirectX, but not Visual C++ Language. Thus, I suggest you post your
question on the microsoft.public.win32.programmer.directx.video newsgroup, there you find DirectX experts and your
question should be answered in no time.
The people there will have enough experience with DirectX to give you the best
advice or answer!
http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.win32.programmer.directx.video&lang=en&cr=US
Thanks! Please remember to mark the replies as answers if they help and unmark them if they provide no help.

No audio from second Channel using Webcam Capture with ASIO source

I am trialing elements version 10 as I am looking for a capture / recording / editing solution for making music videos. I want to be able to record from my webcam and also record two audio streams silmutaneously.
I am using a logitech webcam pro 9000 and a line6 Ux2 Audio recording Sound device. The UX2 is an ASIO compatible device that allows two streams to be recorded; in my case guitar and Microphone for voice. I am able to do this in ASIO comaptible audio editing software.
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I need you help with webcam capturing

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Webcame Capture Problem

Hello,
I am trying to take pictures from webcam throw Labview , Labview can detect the camera but the problem is that it doesn't capture and display the picture
I have installed the IMAQ USB driver and I have tried 3 types of webcames but the same broblem is present
I have used the Labview webcame Library,
and also the example attached
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Thank you
Mar-Q
Attachments:
Acquire a USB Camera Image 1.vi ‏73 KB

Hi qurrr,
Your VI worked fine on my system with my Creative Live! USB camera without requiring any modifications. Are you getting any errors when you try to access your camera?
Are your USB cameras DirectShow compliant? They need to be in order to access them using IMAQ for USB (for example, is the "USB Camera" string indicator you have on the front panel filling in with the name of your camera OK?).
Another possibility is that your are disabling the "snapshot" property of the Image Viewer on your front panel, but in the VI you posted it was still enabled properly. If it was disabled, then when you dispose of the image, it would clear the image display because they would both be pointing to the same space in memory. Please take a look at the following KnowledgeBase articles to see what I mean there:
KB 3NDH344Y: IMAQ Image Display Indicator Changes Throughout Execution of VI
KB 3NRFH84Y: Image Display Refreshing in LabVIEW
To ensure your image display would be updated before your dispose is called, you could change your simple VI to be like the screenshot I've included, where you put the display indicator in a flat sequence with the IMAQ USB Close VI, so that you force it to get called before the IMAQ Dispose VI.
Message Edited by VGA CD-ROM on 02-27-2008 03:10 PM
Regards,
Vijay S.
National Instruments
Attachments:
display_in_sequence.gif ‏8 KB

HP Pavilion dv7-4087cl True Vision Webcam Capture?

Hello,
I have a new HP notebook that meets all the system requirements for using Premiere CS5.5 and it has an integrated HD webcam that I cannot seem to capture with using any of the adobe products. I saw a thread that on location recognizes the webcam like it does on mine as well but that it is just a glitch and that in order to capture with a webcam it would have to connected via usb or firewire. I don't think this is totally accurate though because the MediaSmart software that comes with the PC captures and overlays effects and such just like you would be able to do if you had it set up right in premiere after effects onlocation etc. I was just wondering if anybody else has also tried to do this and got it to work?
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Thanks, Joe

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7200 RPM hard drive for editing compressed video formats; RAID 0 for uncompressed"

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also, i don't quite understand what resolutionFactor is doing. what are the three native width and height values? does setting resolutionFactor=3 for a 128x128 capture translate to a 384x384 resolution? no matter what i set resolutionFactor to, when i check the stream coming in the nativeWidth/nativeHeight is always 128x128.
can you help me clarify this?
Specifies the resolution factor of captured data; ResolutionFactor values range from 1 (lowest resolution) to 10 (highest resolution). Resolution factor gets multiplied by the native width and height of captured camera. We provide three native width and height values based on aspect ratios. That width and height when multiplied with this factor, gives the resolution.

Hi Adam,
If you look at the source code of StreamManager.as in the player 9 source we provide, we have three set of values for native width/height. I will copy them here
@private
          public static const AR_PORTRAIT_W:Number = 144;
@private
          public static const AR_PORTRAIT_H:Number = 112;
@private
          public static const AR_STANDARD_W:Number = 128;
@private
          public static const AR_STANDARD_H:Number = 128;
@private
          public static const AR_LANDSCAPE_W:Number = 160;
@private
          public static const AR_LANDSCAPE_H:Number = 96;
By default, we use the standard values for nativeWidth and nativeHeight i.e. 128 and 128. When you specify a reslotion factor, the native width and height doesn't change but the capture width and height is multiplied by the factor in
camera.setMode(StreamManager.ARSTANDARD_WresolutionFactor, StreamManager.AR_STANDARD_H resolutionFactor, _fps);
So, if you are setting resolution factor as 3 it will do for standard
_camera.setMode(1283, 1283, _fps); though the native width and height remains the same.
If you want to change them, you need to override the createMyStream function in WebcamPublisher.as and change the nativeWidth and nativeHeight( the code is same for 9 and 10, so even If you are using player 10 swc, you can refer to 9 source of this function), but you don't need to do the native width and height, just changing the resolutionFactor should change the capture width/height for you.
Please refer to updateSettings and createMyStream functions in the source code of WebcamPublisher.as for further clarity.
Hope this helps.
Thanks
Hironmay Basu

Webcam capture/save without $3600 NI-Vision

I would like to use the NI-IMAQ drivers to capture a picture for a test system but my company won't purchase the vision module. I can't blame them at $3600 per license! There are some VIs that use system DLLs but they require .net programming, which I am not familiar with.
Is there any way to use IMAQ without parting with all that cash?

Hey Brock,
Andrey is right. The NI Vision Acquisition Software 8.6.1 and the IMAQdx driver that it contains now supports USB cameras (as long as they are Direct Show compliant). With this software, you would be able to acquire images and save them to file. The IMAQdx driver still requires a license. However, because the Vision Acquisition Software does not include any of the machine vision and image processing algorithms, it has a lower price tag. Check out the Release Notes to be sure that this software will work with what you have now.
Hope this helps.
-Ben
WaterlooLabs

Manipulating Webcam capture??????

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