We propose an improved frame rate control method. ITU-T presents video compression standards such as H.261 and H.263 which are recommended for very low bitrate multimedia terminal(H.324). These standards adopt variable frame rate for the compression of 30 frames per second input video signal by utilizing frame selective coding techniques. Therefore, a proper frame rate control stategy is required for these compressions. TMN6, test model for H.263, presents a frame rate control method using the quantization step size. And other methods control the frame rate in such a way that the quantization noise can change slowly. But in variable frame rate, especially below 10 frames per second, the jerkiness effect becomes considerable. Therefore, the new frame rate control method considering the effect of jerkiness is required. This paper presents the jerkinss measure which is well suited for the human visual sense and a method for coding frame selection and allocations of frame target bits in such a way that the variance of the jerkiness can be approximately minimized.
