real-time image capturing system for car plate recognition

293.2.3 Offline Video ModeFirst of all, when the IP camera is setup at the main exit location, the realtimevideo of the vehicle flow-out is recorded by BIP Viewer version 1.3.0.9 in .AVIvideo format. The video is converted from .AVI format into .MP4 format by usingTotal Video Converter Version 3.02 for the sizing purpose. After user inserts ‘2’ inthe mode selection, program will proceed to the case 2, which is the offline videomode.The existence of the offline video will be checked by the program. If thetargeted video is not available, the program will display an exit notification to user.Meanwhile if the video is available it will be loaded into a variable called ‘video’.Same as real-time video operation flow, the user can also insert a desired capture rateunder offline video mode. If the input is not a valid number, the program allows userto reinsert the capture rate. The capture rate will be converted into number mode andthen store into a variable.Then, frame from the offline video will be grabbed and stored into memoryby using image processing library for offline video display purpose. The offlinevideo will be shown in new windows. By using function of ‘cvGetTickCount ( )’ and‘cvGetTickFrequency ( )’ in OpenCV library, the timer is counted by retrieving thetick frequency count from CPU. Timer and frame rate of the offline video will bedisplayed in the window console. Once the new frame is grabbed from offline video,it will show out in new windows automatically and then save as .JPG picture formatalso. Operations above will keep on repeating in the ‘while’ loop and new imagewill be received continuously until the end of offline video. The outline of offlinevideo flow is shown in Figure 3.9.