| 摘要 |
<p>The invention relates to a process for transmission of information relating to moving pictures and is particularly intended for pictures with moderate movement. The invention makes possible transmission on telephone lines with a transmission rate of under 64 kbit/sec. by dividing each picture into macro picture elements comprising a number of image points from the luminance block and the two chrominance blocks, which image points correspond to the same physical picture area. A movement vector is formed if possible and is transmitted for each macro picture element. The picture is scanned in rows or in columns and the movement vectors for macro picture elements, which adjoin the current macro picture element and which have been scanned before it, are mutually compared in order to check whether they satisfy certain conditions, and are compared with the movement vector in the current macro picture element in order to check whether the said vector is identical with any of the the movement vectors in the adjoining macro picture elements or whether the movement vector in the current macro picture element is identical with another movement vector or whether no movement vector exists in the current macro picture element. These operations are coded and transmitted by means of variable length-coding, preferably arithmetical coding, which coding is dependent upon which condition of the movement vectors in the adjoining macro picture elements is satisfied.</p> |
