Method and apparatus for coding information
AssigneeCentral Research Laboratories Limited
InventorMartin Peter Todd
Life of this patent
Estimating the term…
Abstract
A method for inserting coded information into an image comprising the steps of analyzing the image, identifying the edge regions within the image, determining the strength of the edge region, and producing an edge function which is dependent on the strength of the edge. The edge function is added to the image in order to represent coded information.
Claims14
A method for inserting coded information into an image, comprising the steps of analysing the image, identifying edge regions, determining the strength of the edge region and producing an edge function which is dependent on the strength of the edge, and adding the edge function to the image in order to represent coded information.
A method of decoding information contained in an image, the method comprising analysing the image, identifying edge regions and providing an estimate of the edge function dependent on the strength of the edge, and combining the estimated edge function with the image in order to identify in a correlation operation coded information present within the image.
A method of decoding information contained in an image, the method comprising analysing the image, identifying strongly featured regions, determining for at least one such region an anticipated insertion of coded information, and combining such anticipated insertion with the image to determine in a correlation operation whether there has been inserted into the strongly featured region coded information, wherein in order to take account of geometric transformation of the image to be decoded, an inital decoding operation is carried out to determine the periodicity and/or regularity of the anticipated insertions, whereby to determine any such geometric transformation.
Dependencies are inferred from the claim text.