THE FRAME MEMORY AND IMAGE DATA DECODING METHOD IN MPEG DECODER

摘要

A method for decoding MPEG standard I (Intra-coded) and P (Predictive-coded) picture bit streams using a memory smaller than one video frame of data. The method includes the steps of receiving a video bit stream of an I picture and a video bit stream of a P picture in succession and storing the received video bit streams in a first memory, each of the I picture and the P picture having an up portion and a down portion, and each of the up and down portions having a top field and a bottom field; decoding the stored up portion of the I picture and storing the decoded up portion of the I picture in a first region of a second memory; decoding the stored down portion of the I picture and storing the decoded down portion of the I picture in a second region of the second memory; simultaneously decoding the stored up portion of the P picture and displaying the top fields of the up and down portions of the I picture stored in the first and second regions of the second memory and storing the up portion of the P picture in a third region of the second memory; and decoding the down portion of the P picture, waiting for display of the top fields of the up and down portions of the I picture and a predetermined number of scan lines of the bottom fields of the up and down portions I picture, and storing the decoded down portion of the P picture in the first region of the second memory.