초록 ▼

A high definition digital video presentation system is provided with an interpolator which upsamples standard resolution MPEG pictures to higher resolution, preferably to double the number of pixels in both the vertical and horizontal dimensions. The upsampling is performed after the decoding and tr

A high definition digital video presentation system is provided with an interpolator which upsamples standard resolution MPEG pictures to higher resolution, preferably to double the number of pixels in both the vertical and horizontal dimensions. The upsampling is performed after the decoding and transformation of the incoming picture and prior to the buffering of the picture data or the performance of motion compensation by which pixel data are copied from previously received pictures. In the preferred embodiment, frame pictures are decoded, upsampled and stored in full frame picture buffers, preferably, in two buffers, one to be copied into each field of subsequent pictures in the performance of motion compensation. Interpolation may be by frame, where intervening lines of pixels are interpolated from the pixels of adjacent odd and even lines, and by field, where an intervening odd (or even) line of pixels is interpolated from the pixels of each pair of adjacent even (or odd) lines. With frame interpolation, both buffers are stored with a frame interpolated upsampled picture, while with field interpolation, one buffer is stored with a picture interpolated only from even lines and one is stored with a picture interpolated only from odd lines. The decision to interpolate by frame or by field is made macroblock-by-macroblock by the processor based on an analysis of received data to provide the method that most accurately interpolates the intervening pixels. With the upsampled pictures stored in the buffers, no further half-pel interpolation is required for half-pel motion compensation of new pixels, which is carried out by directly copying original or previously interpolated pixels. Preferably pixels at original pixel positions are, however, interpolated from only original pixel data according to MPEG techniques.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of decoding an MPEG video signal for display at a higher resolution than that at which the video stream was encoded, wherein the video stream includes a series of video pictures, the method comprising the steps of:decoding from an MPEG video signal a video pict

[ What is claimed is:] [1.]1. A method of decoding an MPEG video signal for display at a higher resolution than that at which the video stream was encoded, wherein the video stream includes a series of video pictures, the method comprising the steps of:decoding from an MPEG video signal a video picture coded by spacial-transform encoded blocks of digital pixel data at original pixel positions at an initial resolution to produce a decoded picture formed of an array of the digital pixel data at the original pixel positions at the initial resolution;upsampling, to a resolution higher than the initial resolution, the digital pixel data from the decoded video signal by interpolating additional pixels of data at additional positions between the original pixel positions of the decoded video signal to produce an upsampled video picture at the higher resolution;storing as an MPEG reference picture in a buffer memory the upsampled video picture at the higher resolution; andproducing a motion compensated MPEG video picture at the higher resolution by copying interpolated additional pixels of data from the additional positions of the stored reference picture.