![]() Now that your clip is loaded and you are satisfied with the size and selection that you made in the last step, you should now set the parameters that you wish to use during motion detection. However, you can always reload the original movie and begin again. Unfortunately, because storing multiple versions of your movies takes up valuable space on your computer, you will only be able to undo one change at a time. If you are not happy with the result, even after affirming your choice, you may select “Undo Last Change” from the image menu. You can watch your newly edited movie by clicking the button labeled “Play Movie” located at the bottom left of the window. From the Image menu, select “Crop Movie” or “Resize Movie” and follow the instructions. This will be useful when you wish to analyze smaller portions of a large clip that your computer cannot analyze all at once. Once you have your movie loaded, you have the option to crop out a selected portion of the movie, or resize the entire movie. ![]() Note that during preview, the frame number is indicated at the top menu bar. Follow the onscreen instructions to select which frames of your selected movie will be loaded for analysis. Select “Load” then “Load Movie” from the menu and locate the movie you wish to analyze on your hard drive. Once you have identified the movie that you wish to analyze, run the motion detection program (by typing “motiondetector” into the Matlab command line) which will bring up a new window with buttons and a menu. Although this program can crop movies and select specific frames, you should use a video editing program (such as Adobe Premiere) to bring your movies to manageable size. Experiment to see what sized movies your computer can handle. Increasing your random access memory (RAM) and virtual memory will allow you to load and analyze larger and longer movies. The limit to the size of the clip you will be able to analyze is determined by your computer hardware and setup. ![]() The first step to analyzing motion is to select a short sequence of motion (30-60 frames) that you wish to analyze. This simple tutorial should bring you through the basics of using the motion detector program. ![]()
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