BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Analyzing areas of an image          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message Vander Guest Posted: Thu Jun 24, 2004 7:35 pm    Post subject: Analyzing areas of an image Hi all Is it possible to analyze a portion or an area of an image (or frame) from a digitized movie while it is playing? A simple example: A movie that shows a white ball moving from left to right on a dark rectangle (lets suppose a 2 x 10 rectangle). The rectangle area should be virtually divided by four, resulting 4 * 2 x 2,5 virtual rectangles. I wish to be able to detect the centre of the moving ball, to draw a line that follow its path, to determine what rectangle the ball is and its current speed, etc. Any tips, articles, ideas will be appreciate. Thanks. Back to top None Guest Posted: Thu Jun 24, 2004 7:54 pm    Post subject: Re: Analyzing areas of an image Hi, In theory the easy part ... analyze the frame and find the top left corner point of the outscribed rectangle around the ball ... continue and find the bottom right corner point ... so now u have a rect with which u can find its position in each frame .... which in turn (depending on playback speed in frames/sec) should give u an idea of the speed and the positions should give u an idea of a spline path. The practice ... erm .. try it and let me know.. Rgds "Vander" <vander (AT) pucrs (DOT) br> wrote Quote: Hi all Is it possible to analyze a portion or an area of an image (or frame) from a digitized movie while it is playing? A simple example: A movie that shows a white ball moving from left to right on a dark rectangle (lets suppose a 2 x 10 rectangle). The rectangle area should be virtually divided by four, resulting 4 * 2 x 2,5 virtual rectangles. I wish to be able to detect the centre of the moving ball, to draw a line that follow its path, to determine what rectangle the ball is and its current speed, etc. Any tips, articles, ideas will be appreciate. Thanks. Back to top Vander Guest Posted: Thu Jun 24, 2004 8:21 pm    Post subject: Re: Analyzing areas of an image "None" <none (AT) here (DOT) yet> escreveu na mensagem news:40db3027 (AT) newsgroups (DOT) borland.com... Quote: Hi, In theory the easy part ... analyze the frame and find the top left corner point of the outscribed rectangle around the ball ... continue and find the bottom right corner point ... so now u have a rect with which u can find its position in each frame .... Rectangles dimensions should be known because I think they can be drawn on a layer on the movie screen... Quote: which in turn (depending on playback speed in frames/sec) should give u an idea of the speed In theory if I know the frame rate and the time the ball spent to move from a point to another (and the camera doesn't move) I can calculate the speed. Quote: and the positions should give u an idea of a spline path. When I determine the centre point of the ball I could draw a line ... Quote: The practice ... erm .. try it and let me know.. Rgds Keep reading this topic, may be someone can help us, ok Thank you Quote: "Vander" <vander (AT) pucrs (DOT) br> wrote in message news:40db2cea (AT) newsgroups (DOT) borland.com... Hi all Is it possible to analyze a portion or an area of an image (or frame) from a digitized movie while it is playing? A simple example: A movie that shows a white ball moving from left to right on a dark rectangle (lets suppose a 2 x 10 rectangle). The rectangle area should be virtually divided by four, resulting 4 * 2 x 2,5 virtual rectangles. I wish to be able to detect the centre of the moving ball, to draw a line that follow its path, to determine what rectangle the ball is and its current speed, etc. Any tips, articles, ideas will be appreciate. Thanks. Back to top Vander Guest Posted: Tue Jun 29, 2004 11:48 am    Post subject: Re: Analyzing areas of an image Hi people Unfortunately, by now, I have got no answer to this topic. Am I trying to do something that isn't possible to do using Delphi? If you know any article about this topic please post here. Thank you "Vander" <vander (AT) pucrs (DOT) br> escreveu na mensagem news:40db2cea (AT) newsgroups (DOT) borland.com... Quote: Hi all Is it possible to analyze a portion or an area of an image (or frame) from a digitized movie while it is playing? A simple example: A movie that shows a white ball moving from left to right on a dark rectangle (lets suppose a 2 x 10 rectangle). The rectangle area should be virtually divided by four, resulting 4 * 2 x 2,5 virtual rectangles. I wish to be able to detect the centre of the moving ball, to draw a line that follow its path, to determine what rectangle the ball is and its current speed, etc. Any tips, articles, ideas will be appreciate. Thanks. Back to top Lord Crc Guest Posted: Tue Jun 29, 2004 7:12 pm    Post subject: Re: Analyzing areas of an image On Tue, 29 Jun 2004 08:48:59 -0300, "Vander" <vander (AT) pucrs (DOT) br> wrote: Quote: Unfortunately, by now, I have got no answer to this topic. Am I trying to do something that isn't possible to do using Delphi? If you know any article about this topic please post here. I would try comp.graphics.algorithms instead of this newsgroup for such advanced topics. From what i know, it's doable, but certainly not easy in a realtime enviroment. - Asbjørn Back to top Arthur E.F.Heinrich Guest Posted: Tue Jun 29, 2004 7:57 pm    Post subject: Re: Analyzing areas of an image A long time ago a friend of mine said to me: If you can set the color of a single pixel, you can display videos. :-) I think it aplies to you too. If you can identify each single pixel in every frame of your video, you can do it. But the problem is not Delphi. It's hardware. []s Arthur "Vander" <vander (AT) pucrs (DOT) br> wrote Quote: Hi people Unfortunately, by now, I have got no answer to this topic. Am I trying to do something that isn't possible to do using Delphi? If you know any article about this topic please post here. Thank you "Vander" <vander (AT) pucrs (DOT) br> escreveu na mensagem news:40db2cea (AT) newsgroups (DOT) borland.com... Hi all Is it possible to analyze a portion or an area of an image (or frame) from a digitized movie while it is playing? A simple example: A movie that shows a white ball moving from left to right on a dark rectangle (lets suppose a 2 x 10 rectangle). The rectangle area should be virtually divided by four, resulting 4 * 2 x 2,5 virtual rectangles. I wish to be able to detect the centre of the moving ball, to draw a line that follow its path, to determine what rectangle the ball is and its current speed, etc. Any tips, articles, ideas will be appreciate. Thanks. Back to top Vander Guest Posted: Tue Jun 29, 2004 8:07 pm    Post subject: Re: Analyzing areas of an image Thanks for your attention :) Vanderlei "Lord Crc" <lordcrc (AT) hotmail (DOT) com> escreveu na mensagem news:8of3e0hh5fvkf0j0g522mq30vkj91sfl2e (AT) 4ax (DOT) com... Quote: On Tue, 29 Jun 2004 08:48:59 -0300, "Vander" <vander (AT) pucrs (DOT) br> wrote: Unfortunately, by now, I have got no answer to this topic. Am I trying to do something that isn't possible to do using Delphi? If you know any article about this topic please post here. I would try comp.graphics.algorithms instead of this newsgroup for such advanced topics. From what i know, it's doable, but certainly not easy in a realtime enviroment. - Asbjørn Back to top Vander Guest Posted: Tue Jun 29, 2004 8:07 pm    Post subject: Re: Analyzing areas of an image Ok Thanks for your attention :) Vanderlei "Arthur E.F.Heinrich" <borland (AT) xperiment (DOT) com> escreveu na mensagem news:40e1ca1c (AT) newsgroups (DOT) borland.com... Quote: A long time ago a friend of mine said to me: If you can set the color of a single pixel, you can display videos. :-) I think it aplies to you too. If you can identify each single pixel in every frame of your video, you can do it. But the problem is not Delphi. It's hardware. []s Arthur "Vander" <vander (AT) pucrs (DOT) br> wrote in message news:40e156f4$1 (AT) newsgroups (DOT) borland.com... Hi people Unfortunately, by now, I have got no answer to this topic. Am I trying to do something that isn't possible to do using Delphi? If you know any article about this topic please post here. Thank you "Vander" <vander (AT) pucrs (DOT) br> escreveu na mensagem news:40db2cea (AT) newsgroups (DOT) borland.com... Hi all Is it possible to analyze a portion or an area of an image (or frame) from a digitized movie while it is playing? A simple example: A movie that shows a white ball moving from left to right on a dark rectangle (lets suppose a 2 x 10 rectangle). The rectangle area should be virtually divided by four, resulting 4 * 2 x 2,5 virtual rectangles. I wish to be able to detect the centre of the moving ball, to draw a line that follow its path, to determine what rectangle the ball is and its current speed, etc. Any tips, articles, ideas will be appreciate. Thanks. Back to top Nils Haeck Guest Posted: Wed Jun 30, 2004 3:19 pm    Post subject: Re: Analyzing areas of an image If you can somehow threshold your image then you practically have the solution. What I mean is this: your ball may be a distinct color on the wall (white ball, black background). So you set a threshold somewhere (128 gray) and everything above is basically your ball, everything below is the background. Then, you make sure that you only analyse pixels that are cluttered together, so throw away all pixels that are individual spots, bleeps, or noise coming above the threshold. What remains is a cloud of pixels that's your ball. To find the center of this cloud you can simply calculate it's center of gravity in two directions: cg_x = sigma(F(x,y) * x) / sigma(F(x,y)) for all pixels 1..N cg_y = sigma(F(x,y) * y) / sigma(F(x,y)) for all pixels 1..N Where F(x,y) is the gray value of pixel x,y and there are N pixels in the cloud. Speed may be an issue but should be doable on video-sizes that are not too big on modern hardware. And also, since you don't require that high a resolution (only want to determine the rectangle) you can scale the image down before processing. If this is a serious project and you're looking for professional image processing software + support (in Delphi) then drop me a line. I'm available for consulting. 90% of the source code for this I have readily available. Kind regards, Nils Haeck www.simdesign.nl "Vander" <vander (AT) pucrs (DOT) br> wrote Quote: Hi people Unfortunately, by now, I have got no answer to this topic. Am I trying to do something that isn't possible to do using Delphi? If you know any article about this topic please post here. Thank you "Vander" <vander (AT) pucrs (DOT) br> escreveu na mensagem news:40db2cea (AT) newsgroups (DOT) borland.com... Hi all Is it possible to analyze a portion or an area of an image (or frame) from a digitized movie while it is playing? A simple example: A movie that shows a white ball moving from left to right on a dark rectangle (lets suppose a 2 x 10 rectangle). The rectangle area should be virtually divided by four, resulting 4 * 2 x 2,5 virtual rectangles. I wish to be able to detect the centre of the moving ball, to draw a line that follow its path, to determine what rectangle the ball is and its current speed, etc. Any tips, articles, ideas will be appreciate. Thanks. Back to top Lord Crc Guest Posted: Wed Jun 30, 2004 8:05 pm    Post subject: Re: Analyzing areas of an image On Wed, 30 Jun 2004 17:19:27 +0200, "Nils Haeck" <n.haeckno (AT) spamchello (DOT) nl> wrote: Quote: Then, you make sure that you only analyse pixels that are cluttered together, so throw away all pixels that are individual spots, bleeps, or noise coming above the threshold. Median filtering is great for this, but might be a bit expensive cpu wise... - Asbjørn Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Graphics All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.