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.
-
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