Single Image Method
Before the accessibility of automation tools, video annotation was less efficient. Back then, companies adopted the single image method for extracting all frames through a video and annotating the same images with the help of standard image annotation tools. When you consider a 30fps video, there are 1800 frames every minute. The process, however, doesn’t obtain the benefits of video annotation and also the method takes a whole lot of time and is expensive. This is because there are a huge number of images involved. Besides, there is scope for mistakes as a single object can be categorized as one thing in a frame and a different one in the other one.
Continuous Frame Method
Nowadays, automatic techniques are used to streamline the process of video annotation using the continuous frame method. Here, the computers automatically keep a tab on the objects and their locations. They do it frame by frame and safeguard the permanency of the data and information collected. Computers are dependent on continuous frame tools like optical flow for analyzing the pixels in the next and previous frames. It helps in the prediction of the pixel motion in the existing frame.