Canon Kabushiki Kaisha

Canon Research Centre France

Eric Nguyen

Ioana Donescu

Hervé Le Floch

Patrice Onno

Stéphane Baron

Lionel Le Scolan

A method for localizing one or more sound sources of interest placed within a sound environment comprising ambient noise by estimating the directions of arrival (&#x3b8;,&#x3c6;) of said one or more sound source of interest comprising the steps of: calculating the environment steered response power (SRP (t, f, &#x3b8;, &#x3c6;)) corresponding to the steered response power of said one or more source of interest for one or more orientations using said environment audio signals; obtaining, using said array of at least two microphones, noise audio signals corresponding to the audio signals emanating from said sound environment under particular reference conditions; calculating a noise steered response power (SRP(t, f, &#x3b8;, &#x3c6;)) corresponding to the steered response power of the ambient noise for said one or more orientations using said noise audio signals; and estimating the direction of arrival of said sound source of interest.

Method and device for localizing sound sources placed within a sound environment comprising ambient noise

The method of verifying multimedia entities according to the invention to determine whether a first multimedia entity matches a second multimedia entity, is characterized in that it comprises a step of selecting from a plurality of second multimedia entities, by a content-based search, a set of second multimedia entities close to the first multimedia entity, and a step of deciding as to at least one match between the first multimedia entity and at least one second multimedia entity of the set of second multimedia entities, based on a comparison between the first multimedia entity and the second multimedia entities of the set.

Method and device for verifying multimedia entities and in particular for verifying digital images

The invention is a method for determining a segmentation into distinct regions of a set of coefficients representing at least part of an image in order to insert or extract a set of watermarking signals with a predetermined cardinal. The method of the invention generates a set of acceptable segmentations, calculates, for each acceptable segmentation, a probability of error on the detection of the watermarking signals inserted in said each acceptable segmentation, and selects at least a segmentation in the set of acceptable segmentations, on consideration of the probability of error subject to a constraint on the number of regions of the selected segmentation, with respect to said predetermined cardinal.

Determination of a segmentation of a digital signal for inserting watermarking signals and the associated insertion

A method for the prior monitoring of the detectability of a watermarking signal inserted by modulation in a set of coefficients representing for example a digital image. The method comprises the step of simulating a distortion on the set of modulated coefficients, the distortion corresponding to a given compression level of the set of coefficients before modulation, determined by optimisation of a ratio of transmission rate to distortion. The method further comprises the step of calculating a detectability test on the set of modulated coefficients after distortion, and a step of comparing the detectability test with a threshold detection value. The method is used notably for inserting a watermarking signal during the compression of a digital image.

Method for the prior monitoring of the detectability of a watermarking signal

A method of determining a partition into distinct regions of a set of coefficients representative of at least a part of an image in order to insert a watermark comprises the following steps: Use especially for determining an adaptative partition as a function of a criterion of detectability of an information bit inserted on each region.

Method for determining a partition in order to insert a watermark, and associated insertion and decoding methods

Method of inserting and extracting a digital signature

A method of inserting a watermarking signal (w) in a set (X) of coefficients (X ) representing a digital image (I), in which at least one subset of coefficients is modified by said watermarking signal (w), comprises, for each representative coefficient (X ) to be modified, a step of determining a neighborhood (V(X )) of the representative coefficient (X ) to be modified, in the image (I); a step of selecting a neighborhood (V ) in a dictionary of neighborhoods representing coefficients representing the image (I), according to a predetermined criterion of similarity with the neighborhood (V(X )) of the representative coefficient (X ) under consideration; and a step of modifying the representative coefficient (X ) as a function of the watermarking signal (w) and a predetermined masking data item (M(V )) representing the masking effect on a watermarking signal, of the neighborhood (V ) selected in the dictionary.

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Rennes, France

Eric Nguyen