Kakadu R & D Pty Ltd

Newsouth Innovations Pty Limited

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David Scott Taubman

Reji Kuruvilla Mathew

Methods and apparatuses for comparing two images to determine a set of likelihood ratios for each resolution level are described. Each location within the resolution level has its own likelihood ratio that expresses the probability that spatial features of the two images are matched, divided by the probability that spatial features of the two images are not matched. Each image may be decomposed into a multi-resolution hierarchy. A first set of likelihood ratios may be determined for each resolution level based on spatial neighborhoods of the associated locations in each of the two images within said resolution level. A second set of likelihood ratios may be determined for each resolution level by combining the first set of likelihood ratios with the final set of likelihood ratios determined at a lower resolution level, except at the lowest resolution level, where the first and second sets of likelihood ratios are the same.

Method and apparatus for communicating and recovering motion information

The invention relates to a method and apparatus for image compression, particularly to an improved block-coding apparatus and method for image compression. Image compression systems such as JPEG and JPEG2000 are known and popular standards for image compression. Many of the advantageous features of JPEG2000 derive from the use of the EBCOT algorithm (Embedded Block-Coding with Optimized Truncation). One drawback of the JPEG2000 standards is computational complexity. This application discloses a relatively fast block-coding algorithm, particularly as compared with the standard JPEG2000 EBCOT algorithm. Computational complexity is reduced.

Method and apparatus for image compression

This invention describes a method for communicating crude motion information using tracking metadata and recovering more accurate motion information from the received tracking metadata and partial video frame data; in particular, we use metadata to convey crude boundaries of objects in the scene and signal motion information for these objects. The proposed method leaves the task of identifying the exact boundaries of an object to the decoder/client. The proposed method is particularly appealing when metadata itself carries semantics that the client is interested in, such as tracking information in surveillance applications, because, in this case, metadata does not constitute an overhead. The proposed method involves motion descriptions that can be used to predict the appearance of an object in any one frame from its appearance in any other frame that contains the object. That is, the motion information itself allows locations within an object to be invertibly mapped to locations within the same object in any other relevant frame. This is a departure from conventional motion coding schemes, which tightly-couple motion information to the prediction strategy. This property makes the proposed method particularly suitable for applications which require flexible access to the content.

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