MPEG compatible decoder including a dual stage data reduction network
First Claim
1. In a system for processing image representative information, an MPEG compatible decoder comprising:
- means for decompressing an input datastream containing MPEG coded information to produce decompressed information;
means for data-reducing said decompressed information to produce data-reduced information, said data reducing means including data recompression means and data decimation means;
memory means for storing said data-reduced information;
output means for processing information stored by said memory means anda motion compensation network coactively coupled to said memory means and to said data reducing means for processing image motion information.
1 Assignment
0 Petitions
Accused Products
Abstract
A television receiver with an MPEG decoder is configurable for full high definition decoding and display, or reduced cost lower definition display. The MPEG decoder (10-33) uses a controllable dual-mode data reduction network selectively employing horizontal detail reduction (29) and data re-compression (30) between the decoder and the decoder frame memory (20) from which image information to be displayed (27) is derived. The amount of data reduction is manufacturer selected in accordance with the resolution of the display device, e.g., equal to or less than high definition resolution. The frame memory size is also manufacturer selected in accordance with the resolution of the display device.
-
Citations
16 Claims
-
1. In a system for processing image representative information, an MPEG compatible decoder comprising:
-
means for decompressing an input datastream containing MPEG coded information to produce decompressed information; means for data-reducing said decompressed information to produce data-reduced information, said data reducing means including data recompression means and data decimation means; memory means for storing said data-reduced information; output means for processing information stored by said memory means and a motion compensation network coactively coupled to said memory means and to said data reducing means for processing image motion information. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. In a system for processing image representative information, an MPEG compatible decoder comprising:
-
input means for receiving a datastream of compressed image representative MPEG coded information; means for decompressing said image information to produce decompressed information; motion information processing means for processing said decompressed information, said motion processing means including data reduction means comprising data recompressing means and data decimation means for data-reducing said decompressed information to produce data-reduced information; memory means for storing data reduced information from said motion processing means; and output image processing means for processing information stored by said memory means. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. In an MPEG decoder for producing finally decoded motion compensated samples, a method of processing a digital datastream of MPEG coded image representative information comprising the steps of:
-
decompressing said input datastream to produce decompressed MPEG information; data-reducing said decompressed information to produce data-reduced information, said data-reducing step including the steps of (1) selectively enabling and disabling decimation of information from said decompression network to produce first information; and (2) recompressing said first information to produce recompressed information; storing said data-reduced information in a memory; and motion compensation processing information stored by said memory.
-
-
15. In a system for processing a datastream containing MPEG coded compressed information representing image pixel data, an MPEG decoder comprising:
-
a decompressor for decompressing said datastream to produce decompressed data at an output; a frame memory for providing finally decoded pixel data to a display processor; and a motion compensation decoding network coupled to said decompressor output and to said frame memory for producing finally decoded motion compensated pixel data;
whereinsaid motion compensation network further includes a data reduction network including a downsampling means and a recompression means responsive to said decompressed data for providing data-reduced information to said frame memory.
-
-
16. In an MPEG decoder system for processing a datastream of MPEG coded compressed information representing image pixel data, an MPEG compatible decoding method for producing finally decoded pixel data for processing by a display processor, said method comprising the steps of:
-
decompressing said datastream to produce decompressed data at an output; and deriving finally decoded motion compensated pixel data from said decompressed data;
wherein said step of deriving motion compensated data includes the steps of downsampling and recompressing said decompressed data to produce data-reduced information for storage in a frame memory.
-
Specification