Program Flow                 

Public Class For1 Declared               

•  Variables and Constants are set up        

•  The video capture functions are declared       

Form1 is Loaded              

• If a radio button had been saved from the last session to establish the video source, it is used

• ListVideoSources()is called

  • The system scans video source drivers 0 to 9 and lists the active drivers in the videosource listbox

• Previewvideo() is called

  • capCreateCaptureWindowA()is called

    • A capture window is created for the video feed

  • The video window is set us by calling the Sendmessage function to set variables 

• LoadfoundDirectory()is called

  • The year/month and day are established from the calendar and then used as the name of    

       the directory to store and retrieve images.  C:\programfiles\motioncontrol\YYYYMMdd\

• BoldTheCalendarDays() is called

  • Each day of the month are checked to see if a corresponding directory exists, and contains images.   

    • For example, if the current month is February of 2010, the program will look for images in

            20100201 for images

            20100202 for images

            etc, etc until it reaches folder 20100228

            Each time it finds at least on image in the directory, the calendar day is marked bold

• CreateDir() is called

  • if a directory does not exist for the current day, one is created

The program now waits for an action from the user

• User selects a video source from the source list

  • StopPreviewWindow() is called to stop the preview window if active

  • The video source is set as selected

  • PreviewVideo(PictureBoxVideo) is called to restart the video with the new source

• User presses the Start button for Record Motion

• Private Sub StartButton_Click takes the click event

  • The directory name is set to the current date

  • ReplayFileCount is set to count new images and will be used for the file names

  • Timer 1 is initialized and sets the time between pictures

• Private Sub Timer1_Tick now tells the program to take a picture on each pulse

  • Pictures taken during the ""Odd"" pulse are stored as BitmapCaptureImageA

  • Pictures taken during the ""Even"" pulse is stored as BitmapCaptureImageB

  • CaptureImage() is called and actually captures the images and Bitmap…A&B

    • SendMessage() is called to capture the image from the video and copy it to clipboard

    • The odd image is stored as BitmapCaptureImageA

    • The even image is stored as BitmapCaptureImageB

    • GetLines(BitmapCaptureImageA) is called to copy vertical lines of pixels from the imageA

      This is done instead of coping the entire image for comparison

    • GetLines(BitmapCaptureImageB) is called to copy vertical lines of pixels from the imageB

    • GetVB() is called to to record the number of pixel changes in each vertical line.

      The number of changes for each line is stored in array VBV

    • GetHB() can do the same for horizontal lines of pixels, but is turned off for speed

    • A For loop is run on VBV to see how many of the vertical lines have change since last image

      More pixels than the Tolerance must have changed to be recorded as a changed line

    • SaveImage() is called, if the number of changed lines meets the criteria

      The image is saved in a directory with the currents data name    

      the file name is the date and time of the image

     

• User Selects the Forward Play Back button

  • ForwardButton_Click event occurs

    • The direction of play is set to Forward  

    • playFile() is called

      • The directory name is determined from the current calendar date

      • The directory is opened and a filelist is created

      • InitializeTimer2() is called to start a timer for displaying the images

        • On each tick of the timer the filelist counter is incremented    

        • DisplayPicture(ReplayFileCount, dirname) is called

        • The image is displayed in the picture box