A Review On Differential Time Lapse Video Techniques

Time lapse technique is a video generation technique in which each and every frame is capture and stored after some time interval. This time interval or frame selection can be based on a time period the framing device or difference between successive frames. If event is periodic or certain than we can use periodic time lapsing in which record each and every frame after a certain fixed duration. Differential Time Lapse video is a non-periodic time lapse technique. It is generated by capturing each frame and comparing with the previous stored frame by pixel to pixel mapping method. If the number of difference pixel is greater than predefined threshold then the frame is stored otherwise frame is discarded. Then generating a video from these differential frames is a differential time lapse video. It is important for the records, particularly, which are not natural and with this the size of recording is very less as well as it is efficiently helpful to analyze the non-natural event like movement of any human bodies, animal movement etc. A differential time-lapse technique allows us to remove the unnecessary data from the normal video, in order to save the time to visualization and storage space. Time-lapse techniques if used for documentary, not only saves the time to understand how thing are changed but also reduces the size of documentary. Differential time lapse video does not give the information about at which time the event is occurred so in order to find the same in the video output loss less visual watermarking can be used. MATLAB based algorithm is used for generating the differential time lapse video along with the date and time stamping using the loss less visual watermarking.