Abstract: To provide a fast video browsing system in which a fast playback suitable for keeping track of the contents can be performed by adaptively determining the number of skipped pictures according to the motion vector of picture, and displaying the picture after the skipped pictures. In step S1, pictures to be fast viewed are sequentially inputted, and in step S2, n pictures are skipped. In step S3, the picture after the n skipped pictures is displayed. In step S4, using the picture before or after the displayed picture with respect to time, a motion vector at one frame interval is detected, and in step S5, the number n of skipped pictures is determined from the motion vector. As a result, the number of skipped pictures can be adaptively determined by the motion vector of a picture.

Abstract: Picture coded data that are obtained by coding at a coding rate R1 that is input via a coded data input terminal 1 are supplied to a variable length decoder. The variable length decoder decodes data for which variable length coding has been performed, and DCT coding information is transmitted to an inverse quantizer. A quantization controller calculates a quantization step that is necessary for re-quantization, and controls a quantizer. The DCT coding information for which the inverse quantization has been performed by the inverse quantizer is recovered into a DCT coefficient. The DCT coefficient is quantized again by a quantizer at quantization step Q that is determined by the quantization controller, and the result is transmitted to a variable length coder. The variable length coder performs variable length coding of the received data at a coding rate R2, and outputs the resultant picture coded data to a coded data output terminal.