Correlator device
First Claim
1. A correlator device acting on input signals which represent symbols organized in blocks in accordance with a regular configuration, comprising:
- a correlator determining a correlation between the symbols of a current block and symbols having identical positions in a sequence of blocks to be processed coming from said configuration,and selection means selecting from the symbols of said current block a limited number of reference symbols to which the correlation relates, characterized, in that, the selection means select, in the said current block, a reference symbol or symbols by chosing its/their position(s);
either as a function of the data content of the said current block,or in accordance with a random selection,or for a first portion preferably as a function of the data content and for a second portion according to a random selection.
1 Assignment
0 Petitions
Accused Products
Abstract
Correlation device calculating a correlation between a current block of a first image and symbol blocks taken from a second image to determine the displacement vectors. Selection means (26) (27) select a limited number of symbols contained in the said blocks to which the correlation calculation relates. This selection can be effected by either a random choice or as a function of the data content of the blocks. The said current block can be divided into zones onto which the selection means act. A correlator (25) performs the correlation calculation block-sequentially on the overall current block and a decision unit (28) determines the displacement vector. It is possible to chose for the correlator (25) an architecture which promotes either its calculation rate or a reduction in its hardware bulk. The invention is used to reduce the flow of data to be transmitted, more specifically for image (television, videophone) or sound processing.
38 Citations
12 Claims
-
1. A correlator device acting on input signals which represent symbols organized in blocks in accordance with a regular configuration, comprising:
-
a correlator determining a correlation between the symbols of a current block and symbols having identical positions in a sequence of blocks to be processed coming from said configuration, and selection means selecting from the symbols of said current block a limited number of reference symbols to which the correlation relates, characterized, in that, the selection means select, in the said current block, a reference symbol or symbols by chosing its/their position(s); either as a function of the data content of the said current block, or in accordance with a random selection, or for a first portion preferably as a function of the data content and for a second portion according to a random selection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification