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Dynamic Webcam Image

, 24 Jun 2002
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Streaming Dynamic Images from your webcam into your web pages.
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Contents

Introduction

This project presents the way to dynamically generate a picture with C# and ASP.NET. Basically a browser points to your page and gets back a picture grabbed on your webcam.

You will be able to access your webcam by placing a HTML IMG tag on your webpage. The picture at the top is an example of usage.

To be able to use the webcam you need to register with regsvr32 the COM Dll CamServer.dll in the 'COM Component' directory.

Method

The first thing to do to get a picture from an ASP.NET page is to determine the MIME file type that the file will handle. In our case the MIME type is JPEG. So we define in the ContentType of the Page:

<%@ Page Language="c#" ContentType="image/jpeg" %>
We also need to specify at the top of the page the namespace that will be used:
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.Net" %>
Then comes the code that will grab the image from the wbecam and returns it to the client:
<script language="C#" runat="server">

protected void Page_Load(object sender, EventArgs e)
{
    //Jpeg compression quality
    short nQuality = 45;

    //Shout a picture from my webcam
    CAMSERVERLib.Camera cam = new CAMSERVERLib.CameraClass();

    byte[] picture = (byte[])cam.GrabFrame( nQuality );

    //Add the hour to the jpeg picture
    MemoryStream ms = new MemoryStream( picture );
    Bitmap bmp = new Bitmap( ms );

    Graphics g = Graphics.FromImage( bmp );

    string strDate = DateTime.Now.ToLongDateString() + " - " + 
                                       DateTime.Now.ToLongTimeString(); 

	StringFormat drawFormat = new StringFormat();
    drawFormat.Alignment = StringAlignment.Center;

    g.DrawString(   strDate,
                    new Font( FontFamily.GenericSansSerif, 12 ),
                    new SolidBrush( Color.Black ), 
                    new RectangleF( 1,1,320,240 ),
                    drawFormat
                );

    g.DrawString(   strDate,
                    new Font( FontFamily.GenericSansSerif, 12 ),
                    new SolidBrush( Color.White ), 
                    new RectangleF( 0,0,320,240 ),
                    drawFormat
                );

    //Get codecs
    ImageCodecInfo[] icf = ImageCodecInfo.GetImageEncoders();

    EncoderParameters encps = new EncoderParameters( 1 );
    EncoderParameter encp = new EncoderParameter( System.Drawing.Imaging.Encoder.Quality, 
                                                  (long) nQuality );

    //Set quality
    encps.Param[0] = encp;

    bmp.Save( Response.OutputStream, icf[1], encps );
    
    g.Dispose();
    bmp.Dispose();
}
</script>
In the code there is nothing new, compared to the other articles. We get a jpeg picture grabbed by the webcam using COM Interop. We add the hour and the little difference is that the image stream is saved to Response.OutputStream .

Usage

You may reference the ASP.NET page has a normal jpeg picture:

<img src="http://XXX/WebcamPicture/WebForm1.aspx" width="320" height="240"/>
or in a ASP:Image control.

Conclusion

This opens lots of possibilities in the creation of dynamic graphics. For example you may create dynamic charts linked to database values returned has a normal graphic in a presentation page. You may also make easily a visit counter for your pages...

Known Issues

  • None.

History

Version 1.00 June 14, 2002
First release.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Laurent Kempé
Architect
France France

Laurent Kempé is the editor, founder, and primary contributor of Tech Head Brothers, a French portal about Microsoft .NET technologies.

He is currently employed by Innoveo Solutions since 10/2007 as a Senior Solution Architect and certified Scrum Master.

Founder, owner and Managing Partner of Jobping, which provides a unique and efficient platform for connecting Microsoft skilled job seekers with employers using Microsoft technologies.

Laurent is awarded by Microsoft since Avril 2002: Most Valuable Professional (MVP).

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Comments and Discussions

 
QuestionHard code default webcam possible? Pin
Aakshay Subu2-Apr-14 20:08
memberAakshay Subu2-Apr-14 20:08 
Questionun error Pin
tobias0227-Aug-13 18:39
membertobias0227-Aug-13 18:39 
QuestionCapture Image from Web Cam Asp.net application Pin
Member 991393816-May-13 21:30
memberMember 991393816-May-13 21:30 
QuestionRe: Capture Image from Web Cam Asp.net application Pin
manipriya62110-Jul-13 0:27
membermanipriya62110-Jul-13 0:27 
QuestionError Pin
Ashish Rathod15-Dec-12 0:22
memberAshish Rathod15-Dec-12 0:22 
QuestionI need codes about how to cotrol camera Pin
xianzhi yin2-May-12 16:04
memberxianzhi yin2-May-12 16:04 
QuestionRequest for IP camera C++ code Pin
Winson_19894-Apr-12 22:53
memberWinson_19894-Apr-12 22:53 
GeneralMy vote of 1 Pin
G RAGHUVEER28-Feb-12 23:56
memberG RAGHUVEER28-Feb-12 23:56 
QuestionOnly Date and Black Screen Pin
Hewbert Gabon23-Jan-12 7:16
memberHewbert Gabon23-Jan-12 7:16 
AnswerRe: Only Date and Black Screen Pin
Member 86139702-Feb-12 6:16
memberMember 86139702-Feb-12 6:16 
QuestionRe: Retrieving the COM class factory for component with CLSID {D6BA1539-8473-497C-92C3-8ECF63DAC0F3} failed due to the following error: 80040154 Pin
puneetisonfire8918-Oct-11 0:17
memberpuneetisonfire8918-Oct-11 0:17 
AnswerRe: Retrieving the COM class factory for component with CLSID {D6BA1539-8473-497C-92C3-8ECF63DAC0F3} failed due to the following error: 80040154 Pin
Raghava jogu2-Apr-12 22:58
memberRaghava jogu2-Apr-12 22:58 
GeneralRe: Retrieving the COM class factory for component with CLSID {D6BA1539-8473-497C-92C3-8ECF63DAC0F3} failed due to the following error: 80040154 Pin
NwCaos22-Apr-13 8:16
memberNwCaos22-Apr-13 8:16 
Questionyour project is error ridden and not working Pin
international ninja28-Sep-11 8:59
memberinternational ninja28-Sep-11 8:59 
Questionimage capturing only from my system web cam if i upload the code in server Pin
rajender3813-Sep-11 1:47
memberrajender3813-Sep-11 1:47 
GeneralUnable to add reference file CamServer.dll Pin
56456kj4-Jun-11 11:36
member56456kj4-Jun-11 11:36 
GeneralProblem to register Pin
Unknown Ajanabi20-Jan-11 22:14
memberUnknown Ajanabi20-Jan-11 22:14 
GeneralRe: Problem to register Pin
Member 794624723-May-11 0:57
memberMember 794624723-May-11 0:57 
GeneralMy vote of 5 Pin
Joe Sonderegger14-Jan-11 2:58
memberJoe Sonderegger14-Jan-11 2:58 
GeneralVirus Found Pin
scienty775-Jan-10 22:59
memberscienty775-Jan-10 22:59 
GeneralRe: Virus Found Pin
Laurent Kempé5-Jan-10 23:19
memberLaurent Kempé5-Jan-10 23:19 
GeneralBlank Image Show Pin
piyush.sabla@e-connectsolutions.com28-Nov-09 1:34
memberpiyush.sabla@e-connectsolutions.com28-Nov-09 1:34 
GeneralRe: Blank Image Show Pin
puneetisonfire8917-Oct-11 21:27
memberpuneetisonfire8917-Oct-11 21:27 
GeneralRetrieving the COM class factory for component with CLSID {D6BA1539-8473-497C-92C3-8ECF63DAC0F3} failed due to the following error: 80040154 Pin
ajau.jain23-Nov-09 3:38
memberajau.jain23-Nov-09 3:38 
GeneralRe: Retrieving the COM class factory for component with CLSID {D6BA1539-8473-497C-92C3-8ECF63DAC0F3} failed due to the following error: 80040154 Pin
puneetisonfire8917-Oct-11 21:00
memberpuneetisonfire8917-Oct-11 21:00 
QuestionERROR GrabFrame() Pin
selvakumarbt24-Aug-09 2:10
memberselvakumarbt24-Aug-09 2:10 
AnswerRe: ERROR GrabFrame() Pin
roshilkdecs30-Sep-09 23:09
memberroshilkdecs30-Sep-09 23:09 
GeneralStoring in database Pin
Member 33558209-Apr-09 22:17
memberMember 33558209-Apr-09 22:17 
General[My vote of 1] hi need help Pin
firas_maher8-Apr-09 23:58
memberfiras_maher8-Apr-09 23:58 
QuestionWebcam: Registering CamServer.dll Pin
Tushar.Johri14-Nov-08 13:55
memberTushar.Johri14-Nov-08 13:55 
Questionstoring the images Pin
jajjssddd23-Sep-08 22:12
memberjajjssddd23-Sep-08 22:12 
GeneralThanks Pin
Fastfootskater12-Jul-08 7:55
memberFastfootskater12-Jul-08 7:55 
GeneralPanda Software alert of virus on the project Pin
nick716-May-08 19:31
membernick716-May-08 19:31 
GeneralRe: Panda Software alert of virus on the project Pin
Laurent Kempé6-May-08 23:27
memberLaurent Kempé6-May-08 23:27 
Generalregister the dll Pin
riccardodaria28-Apr-08 6:43
memberriccardodaria28-Apr-08 6:43 
Questionhow to this capture image in database Pin
mastermehta26-Feb-08 22:00
membermastermehta26-Feb-08 22:00 
Generalneed capture the photo in client system Pin
arumguavel24-Feb-08 20:36
memberarumguavel24-Feb-08 20:36 
GeneralRe: need capture the photo in client system Pin
venkeeyy14-Apr-08 22:26
membervenkeeyy14-Apr-08 22:26 
Generalwant to check web cam connect or not Pin
arumguavel30-Jan-08 19:07
memberarumguavel30-Jan-08 19:07 
Generalhelp Pin
izzettamer2-Oct-07 2:14
memberizzettamer2-Oct-07 2:14 
GeneralRe: help Pin
daldal13-Oct-07 8:35
memberdaldal13-Oct-07 8:35 
GeneralERROR GrabFrame(). Pin
Hariom narayan20-Jul-07 2:21
memberHariom narayan20-Jul-07 2:21 
GeneralRe: ERROR GrabFrame(). Pin
shamaaaaaaaaaaaaaa26-Apr-08 3:30
membershamaaaaaaaaaaaaaa26-Apr-08 3:30 
GeneralRe: ERROR GrabFrame(). Pin
Member 57512753-Dec-08 22:46
memberMember 57512753-Dec-08 22:46 
GeneralRe: ERROR GrabFrame(). Pin
jonno00716-Nov-09 4:45
memberjonno00716-Nov-09 4:45 
GeneralRe: ERROR GrabFrame(). Pin
~~BAKKAR~~23-Oct-08 3:31
member~~BAKKAR~~23-Oct-08 3:31 
GeneralRe: ERROR GrabFrame().WebDev.WebServer.exe[1348] Pin
ajau.jain18-Feb-09 0:13
memberajau.jain18-Feb-09 0:13 
GeneralRe: ERROR GrabFrame(). Pin
k_catch5-Aug-10 7:32
memberk_catch5-Aug-10 7:32 
GeneralThanks! Pin
Ronald Colijn18-Jun-07 0:43
memberRonald Colijn18-Jun-07 0:43 
GeneralRe: Thanks! Pin
sumantmunna24-Jun-07 21:21
membersumantmunna24-Jun-07 21:21 

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Article Copyright 2002 by Laurent Kempé
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