Both the original DOS version and the new Windows version will be detailed in this manual.
These programs are available from Bob Corson. Please contact me via email at firstname.lastname@example.org
The intent of this document is to give basic information and instructions about the video jump system. Theory of Operation The video jump system uses computer and video technology to be able to measure jump distances. Buoys are placed in the water in front of the jump roughly in squares. The skier lands inside these squares. The buoys are surveyed so that their exact positions are known. These positions are fed into the computer. A video camera is set up perpendicular to the center of each box of buoys. This video picture is put on the computer screen with a graphics overlay. The overlay is used to calibrate the buoys to their screen positions. Mathematical transposition is used to create a mathematical representation of any screen position inside the square to its actual physical location and then calculate the distance between that point and the jump. As the jumper lands, the video is frozen. The cursor is then used to indicate the closest point of contact in the water to the jump ramp. This is the point of measurement. A factor of 2.1 meters is added to this measurement to give the equivalent distance measured by the Johnson Jump Meter system. This is added automatically by the computer. Equipment Required a) video cameras one camera per box of buoys. The camera can be home video quality b) cabling standard COAX cable RG59 is used. This is the same as is used for cable TV. The cable has to go to the computer system from the camera. This probably shouldn't exceed 1000 ft without amplification. c) VCR One VCR per video camera is required d) Computer Standard IBM PC or clone. A 386 will probably work. A 486 is better. The optimal setup uses two computers so that you don't have to switch between views during a jump. e) Overlay Card The overlay card that the program is written for is the Creative Labs Video Blaster. The most recent version is the VBSE100. The DOS program will work with a generic overlay card, but will not implement any of the special Video Blaster features. The Windows program requires the SE100. The Video Blaster has three video inputs. f). NTSC output generator (optional) This box takes the screen VGA image and outputs a NTSC TV signal that can be fed to a monitor and/or to a VCR for recording. Site Set Up Buoys Buoys are set in line with the center-line of the jump and a line 10m out from the center of the jump. In the distance direction they are set in 10-20 meter increments. A typical setup might be buoys at 20m, 35m, 50m, and 65m on both the centerline and the 10m line giving 4 boxes of buoys. These boxes are also called grids. In this case, three cameras could be used. Another scenario might be to put buoys at 10m increments and use two boxes for one camera so that the longest jumps would land in a 10 m box and the shorter jumps would land in the 20 m box (made of 2 boxes). This is very variable depending upon the event and the divisions in the tournament and the number of cameras available. The buoys should be small buoys, perhaps 15 cm in diameter. The buoy grids also must be set out so that each grid box has a unique combination of buoy colors so that it is easily identifiable. An example using (R)ed and (G)reen buoys might be as follows: G G R R G R G R 20m 35m 50m 65m Please note that this is an important point and will avoid much confusion, especially if the cameras are a long distance from the computer operators. Cameras Set the cameras roughly perpendicular to the center of the box being measured. If you have only two cameras, you will most likely need to move them for different events. The cameras should be from 2 m to 10 m in height above the surface of the water. The further out the buoys are, the higher the camera should be. Higher is generally always better. The camera should be zoomed in on the buoys so that the near buoys almost fill the whole screen width. Cabling Coax (RG59) cable should be used. You will need adapters to plug into the video equipment which uses RCA type connectors. The camera should be connected to the VCR line input and the VCR output should go to the overlay card in the computer. These cables might typically be 100 meters. Computers It is best to use 2 486 type computers, one for each camera grid. In this way, you won't have to switch the view as the jumper is landing. For the windows program, a 486-33DX is the minimum if you want to save GIF files. Program Operation - Windows program General The current Windows program, vidjmpj.exe was developed under Visual Basic. The program is new and still being enhanced as constructive criticism is received. A copy of the program is available at the following site - ftp.telesciences.com The program is in 3 subdirectories of the incoming directory. The three sub-directories should be loaded on to three floppy disks which then act as an installation set. There are also configuration files on disk three which need to be transferred to the program directory. Environment Be sure that the SE100 software is loaded and especially the MCI Drivers. The program runs in windows 3.1 or win95 Startup Start the program from the windows run function. The program will ask if there is a vconfig.txt file in the application directory. There should be so say yes. If there isn't and that fails, say no and create one later with the Config menu in the startup screen. The vconfig.txt file gives administration information to the program on file directories for results, gifs, and initialization parameters. The standard setup should be that there is a directory with the tournament name (96masters) with three sub-directories as follows: results gifs init If you had a vconfig.txt file, the paths will be displayed in message boxes before the start screen is displayed. START SCREEN This screen comes up as a full screen window with live video in the window. The menu options are as follows: Setup go to buoy and survey setup screen Measure go to measurement screen - disallowed until a proper setup is entered Results displays the current results text file Configure Sub-menu items to do the following: Change the results file path\filename Change the GIF path Change the Initialization file path Change the tournament name The above changes are all stored in vconfig.txt in the jump program directory Change left-to-right - set for direction of jumping Barefoot - if set to barefoot, do not add the 2.1m offset Note: if it says Barefoot in the menu, it means to change to Barefoot. If it is in barefoot mode it will say Tournament in this menu item. Message color - change the messages n the measurement screen to this color to allow for different background colors in the video. SETUP SCREEN This screen displays live video and input boxes for the survey data. The menu items are as follows: Load - Loads a previously saved initialization file Save - Saves an initialization file Exit There is an Alert Icon on the left side of the screen. If the input is incomplete, it is an exclaimation point. If the input is completed, it is a happy face. The program will warn you if you try to leave the screen without a happy face. If you leave without a happy face, you cannot enter the measurement screen. This video should be as you will operate the measurement system. The idea here is to calibrate the jump course buoys to the survey. You will need an XY survey of the jump course buoys and the jump. Enter this data in the boxes indicated. Click on a radio button to position the grid markersd on the buoys. The radio buttons are in the same position as the buoy, upper left, upper right, etc. Click the button and then click the mouse point on the exact center of the buoy at the waterline (center of the buoy means the center of the inside of the buoy at the water level - some judgement required). NOTE: THIS MUST BE EXACT AND PRECISE! Do this for all four buoys of the grid box. When you are satisified, click on the COMPLETE button to do the transform calculations. You will be rewarded with a happy face. Now use the save menu to save the initialization file. A customary file name for example would be tl2540.ipt for the Twin Lakes tournament grid from 25m to 40m. Now if you enter the startup screen and use the Load menu right away to load this file, you will have a happy face. Be sure to give the file a good desciption as this description will be displayed on the measurement screen to remind you what box you are in. The Draw buoys button is used when you load a file to draw the crosses at the buoy locations to be sure that the setup hasn't changed or the camera moved. If you move the camera and move it back, you only have to load the correct grid box file, re-position the four buoy markers, re-compute with the COMPLETE button and save the file to re-set up. Exit back to the Start Screen MEASUREMENT SCREEN The measurement screen does the work of the program and is the most complex screen. The following menu items are on the screen: Freeze - press ALT F to freze the screen. I found that the keyboard operation was the most reliable. You can just watch the skier on the water and hold down ALT and press F when he hits the water. Save Picture - This allows you to save the frozen picture on the screen. This shouldn't be necessary to use since it is normally saved as part of the "Record Jump" function. Load Picture - This function allows you to load a previously saved gif to check it again. Be sure that the appropriate grid is being used by pressing the show grid button to match up the crosses on the buoys. The file names are numerical, but quite easy once you understand the way they are created. The number is the time of the jump in the following format: MDDHHmms.gif where M is the second digit of the month (July = 7, October = 0) DD is the day of the month (October 15 = 15) HH is the hour time in 24 hour format mm is the number of minutes of the current time s is the tens of seconds Example - a jump that occured on July 10 at 14:30:45 would have the file name 71014304.gif. Each result is also timestamped in the results file so they may be matched quite accurately and exactly. The GIF is saved a few seconds after the result is posted in the file. Results - This displays the result file on the screen Exit The screen also includes the following text input boxes: Skier Name -- Enter the skier's name in this box. Any change to this box resets the jump number to 1 Jump number - may be edited manually, but increments automatically Distance in meters - output of calculated distance in meters Distance in feet BUTTONS: Unfreeze - Unfreezes the video screen. When frozen a large "FROZEN" sign is on the screen. Record Jump - calculates and shows the distance and saves the result in the result file. An option box will come up to give you the option of saving or not saving the GIF. Always save scored jumps. Verify - allows verification of a previous jump by letting you bring up the GIF file and positioning the mouse pointer to the same XY point as indicated in the results file to show that the jump was measured correctly. When this button is on text boxes appear that show the X and Y coordinates of the mouse pointer. Show Grid - This button is very important and should always be pressed to show the grid. judges should constantly monitor that the crosses are on the buoys to ensure that the camera has not moved or come out of alignment. RADIO BUTTONS: Pass Fall - only one of these two can be turned on. Hit the appropriate button and "Record Jump" if the skier passes or falls. Man. Reride - hit this if there is a fast speed reride- it will clear when you unfreeze the screen. If you hit it when the screen is not frozen, it will clear immediately. The only function is to put an appropriate comment in the results file and clear the distance results boxes. Opt. reride - This operates similarly to the mandatory reride button except it doesn't clear the distance boxes. Comment - Pressing this allows you to enter a comment in the results file. Other grid - use this in a two computer operation when the jump is on theother computer. Enter the distance from the other computer IN METERS. END OF WINDOWS VERSION Program Operation - DOS program Startup The current DOS program vidjp95h was developed under QuickBasic Version 4.5. The program VIDJP95H.BAS requires the Quick Basic environment. The text file of the program VIDJP95H.TXT will run under Q BASIC which is supplied with DOS 5.0 and above. Just type QBASIC at the C:\ prompt and Q BASIC should come up. Use the ESCape key to clear the screen. ALT F will pull down the File Menu. Choose O for Open and select the VIDJP95H.TXT program. Then run the program by typing ALT R (Enter)or F5. The screen will return to a DOS screen and ask you for a file name in which to store the results. Select a name and input it. Do not include a suffix. The .TXT suffix will be added to this file name. The next prompt asks for the type of Video Blaster card. Enter as requested. Then the main menu will come up looking like this: Video Jump Distance Measurement Main Menu 1 - Setup and Calibration 2 - Measure Jump Distance 3 - Instructions 4 - Type Results So Far 5 - Exit Setup and Configuration Enter 1 for Setup and Configuration to get the Setup Menu as follows: New Jump Distance Measurement Initialization Calibration Menu Direction is Left to Right 1 - Input Screen Initialization Points 2 - Input Survey Coordinates 3 - Select Grid Scale 4 - Display Initialization Points 5 - Display Grid 6 - Save Initialization Points in file 7 - Display directory of initialization point files 8 - Display contents of initialization point files 9 - Load Initialization Point file 10 - Change measurement mode (in first point mode now) 11 - Configuration Parameters 12 - Video Test 13 - EXIT Function Description: 1 - Input Screen Initialization Points Set the screen points to match the screen location to match the position of the buoys. Follow the directions to match the buoys against screen positions by moving the horizontal and vertical cursors. Pay careful attention to the numbering of the buoys. 2 - Input Survey Coordinates The measurement buoys should be surveyed as well as the position of the jump. These positions are fed into the computer here. 3 - Select Grid Scale The grid usually starts with the shortest measurement buoy distance and goes in 2m increments until it gets to the next buoy. 4 - Display Initialization Points This screen shows the initialization points overlaid on the video to check alignment. 5 - Display Grid This function displays the grid with the parameters input. 6 - Save Initialization Points in file After functions 1,2, &3 are complete, save the numbers in a file of your choosing. 7 - Display directory of initialization point files This function shows what initialization files are already on the system. Remember to include the full path. 8 - Display contents of initialization point files This function shows the indicated configuration file (suffix .ipt) contents. these files are text files. 9 - Load Initialization Point file Indicate a file to be loaded. 10 - Change measurement mode (in first point mode now) Originally, the program was set up to measure either first point or center of splash. The first point is the method that you should use as the other produces mixed results. 11 - Configuration Parameters There are certain parameters that you can change in this menu. The most important have to do with the grid. The program can be configured to show the distance grid as well as the instantaneous distance as you move the cursor. These are turned off so the judge will pick the distance "blind" rather than knowing what the distance is so he won't be predisposed to "help" the skier or be influenced by the distance when he is picking the first point on the screen.. Video parameters can also be changed. An XYFILE name can be chosen. The program records an XY position for each measurement for later analysis. 12 - Video Test This menu option turns on the Video Blaster to test video. 13 - EXIT Calibration Operation Each grid must be calibrated for each camera view. The grids are numbered 1,2, &3. The grid is requested during the calibration operations (menu items 1,2, and 3) as well as when the resulting calibration file is stored. If two computers are used, each computer should have all of the grids in it for backup purposes. Measurement The measurement screen will first ask for a skier name and a jump number before measurement can start. the video is shown on the screen overlaid by 4 crosses showing the position of the four calibration buoys. (note: It is important to pay constant attention to these buoy calibration marks. If they shift from the calibration position, the screen must be re calibrated. This would indicate that the camera moved and that perhaps needs a more secure mounting) Also, a small cross showing the point for first point of impact and a vertical line 2.1 m in front of it that shows the approximate center of the splash of the jump. The mechanical process of measuring the jump is accomplished by typing in single letter commands while in the measurement screen. The basic command sequence would be for the operator to observe the skier landing in the buoy box. As the skier lands the operator will press "f" to freeze the screen. This must be done quickly as the skier lands and will take some practice to get it right. The distinctive small splash that marks the first point of contact persists for about 0.7 seconds. There is also a slight delay between the pressing of the freeze command and its effect. Once the picture is frozen, the "cross" cursor must be moved to the first point of impact. There are several key commands that move the cursor. The typical ones to use would be CTRL (arrow) for a gross movement to the vicinity of the splash and then just the (arrow) key for the fine adjustment. The center of the cross must be at the impact point on the surface of the water both horizontally and vertically. Once this is positioned, press "Enter" to display the distance on the screen in feet and meters and store it in the results file as well as increment the jump number. A "z" command will erase the distance display to be ready for the next jump. If the jump is missed, then the operator must stop the VCR, back it up to the point where the skiers is seen and freeze the video at that point. Depending upon the controls of the VCR, this may be easy or cumbersome. The VCR should be selected for its capabilities in this area. If the controls are sophisticated, the picture can be stopped with the VCR 1 frame after the skier's skis touch the water for the most accurate and easy measurement. Be careful if using the freeze frame on the VCR that the buoy indicator crosses still are aligned correctly as some VCR's shift the picture slightly when in freeze frame mode. If only one computer is used, the operator must switch between grids to get the landing on the screen so that it can be frozen. This is more difficult and results in more VCR operation. However, if the tournament is not a major competition, this additional 30 second or so delay is probably acceptable. However, at a major tournament, it will be very frantic while the operator tries to get the distance and everyone wants to know the distance. Typically, the distance can be obtained within 5 to 10 seconds. When using two computers (the desired method), one computer is on the longer grid and one is on the shorter. The two operators should sit side by side. When the jump landing is frozen, both operators should decide on the cross cursor placement before recording the distance. In an international tournament, these two operators should be from different countries. Also, the during competition, the instantaneous measurement feature must be turned off as well as the grid lines so that the operators are selecting the distance "blind". Also, the two computers must be kept in sync. This means that on the computer that the skier didn't land in, the distance must be entered in as the distance on the other computer. (See instructions in next section). Two other useful commands are the "h" command which will display all of the key commands on the screen and the "p" command which will display the results so far. THE MOST IMPORTANT THING TO DO IS TO READ THE INSTRUCTIONS DISPLAYED ON THE SCREEN VERY CAREFULLY AS THEY WILL GUIDE YOU THROUGH THE PROCESS. Instructions This menu item displays all of the key commands that are used during the measurement mode. The list plus a brief description of each command follows. Note that the command key is in brackets so that (r)ight means to press the "r" key to implement the function. a) Cursor Controls right, left, up, down arrows - 1 pixel movement ctrl arrow - 20 pixels" (r)ight, (l)eft, (u)p, d(own) keys - 20 pixel" (R)ight, (L)eft, (U)p, D(own) keys - 20 pixels" b) (f)reeze the video Pressing the "f" key freezes the video picture on the screen. Note that if you hold down the f key or leave finger pressure on it, you may get multiple freezes and miss the one you wanted. Experiment with your particular computer keyboard to get the feel of it. c) (t)haw the video Pressing "t" unfreezes the video. It has no other effect Splash Mode measurement commands - disregard these commands (c)ircle on (e)rase circle (C)ircle to be larger (.25 step) (E)rase circle size (step smaller) note: circle only shown in splash measurement mode" d) (g)o to start of measurement screen This is used to refresh the grid if the grid is being displayed. Moving the cursor across the grid erases it until it is refreshed or a jump is measured which automatically refreshes it. e) Enter (show distance in feet, meters in large letters) This is the basic operational command. This not only displays the distance, but officially records the jump in the results file. f) (z) erase distance display g) Grid Selection Commands (1) to use camera #1 (source 0) (2) to use camera #2 (source 1) (3) to use camera #3 (source 2) Use these commands to select the desired measurement grid. h) (n) new skier name When a skier is finished his jumps, the next skier is entered with this command. i) jump on other (s)creen When in two computer mode and the jump is recorded on the other screen, use this command to enter the distance and increment the jump number to keep the two computers synchronized. Note if the skier lands so that the measurement point is available on both screens, the official screen is the one where the measured point is inside the buoy grid. If measured on both screens, the distance should be the same, but may differ by 0.1 m if the jump is just on the boundary of the measurement. A measurement will still be accurate if it is 1-2 m outside the box in a horizontal direction, but this should be avoided. j) n(o)te to add after jump This is to make a notation for later reference. It will ask you for a comment that will be time stamped and added into the performance results. k) (m)iss add PASS/BALK/FALL Use this function to note when the skier misses a jump. This function increments the jump number. l) (p)erformances up to now This function prints the performances on the screen up to now. It always prints all of the performances, a screen at a time. Pressing the space bar advances the screen. Note that there is no provision in the program to print the results file. This is intended to be done outside the program with DOS commands or with the EDIT program supplied with DOS. m) rer(i)de When there is a reride, this function lets you note if it was optional or mandatory. This would be mostly for bad speed or path rerides. n)(q)uit measurement Go back to Main Menu o) (h)elp Display the above commands on the screen. Results This menu function displays the results so far. The results are in a file that the operator named upon start of the program. Homologation and records To certify the jump measurement setup, the homologator must survey the jump position and the position of the marker buoys. The accuracy of the setup may be checked by moving the measurement cross cursor to each buoy and measuring the distance to each buoy which can also be calculated using the survey measurements. Don't forget to subtract off the 2.1m added on by the program! For a record submission, the complete survey must be submitted along with a copy of the video showing the jump landing. This will be sufficient to verify the distance. Also note the color scheme of the buoys.