Patent application number | Description | Published |
20090049083 | Method and Apparatus for Accessing Data Using a Symbolic Representation Space - A method of browsing data items using an n-dimensional array of symbols, where n is greater than or equal to 1, each symbol corresponding to at least one data item, using selecting means movable through the n-dimensional array and capable of selecting points in the array including where no symbol is located, comprises selecting at least one symbol and the corresponding data item according to the location of the selecting means. | 02-19-2009 |
20100188580 | DETECTION OF SIMILAR VIDEO SEGMENTS - A method and apparatus for processing a first sequence of images and a second sequence of images to compare the first and second sequences is disclosed. Each image of the first sequence and each image of the second sequence is processed by: (i) processing the image data for each of a plurality of pixel neighbourhoods in the image to generate at least one respective descriptor element for each of the pixel neighbourhoods; and (ii) forming an overall image descriptor from the descriptor elements. Each image in the first sequence is compared with each image in the second sequence by calculating a distance between the respective overall image descriptors of the images being compared. The distances are arranged in a matrix, and the matrix is processed to identify similar images. | 07-29-2010 |
20100189409 | VIDEO IDENTIFICATION - A method and apparatus for processing a first sequence of images and a second sequence of images to compare the first and second sequences is disclosed. Each of a plurality of the images in the first sequence and each of a plurality of the images in the second sequence is processed by (i) processing the image data for each of a plurality of pixel neighbourhoods in the image to generate at least one respective descriptor element for each of the pixel neighbourhoods, each descriptor element comprising one or more bits; and (ii) forming a plurality of words from the descriptor elements of the image such that each word comprises a unique combination of descriptor element bits. The words for the second sequence are generated from the same respective combinations of descriptor element bits as the words for the first sequence. Processing is performed to compare the first and second sequences by comparing the words generated for the plurality of images in the first sequences with the words generated for the plurality of images in the second sequence. | 07-29-2010 |
20100201889 | DETECTION OF WIPE TRANSITIONS IN VIDEO - A method of processing a sequence of video frames to determine whether a wipe transition exists between shots of the sequence comprises, for each video frame, calculating its differences from a previous frame using the colour and spatial position information of the pixels in the current frame and the previous frame, projecting the differences onto one or more projection axes or other bases, calculating a measure of the likelihood that an abrupt shot transition has taken place for each of a plurality of points on a projection based on the projection value at each point for a plurality of frames including the current frame, and detecting wipes by detecting characteristic geometric patterns in the temporal sequence of the said measure of likelihood in one or more projections. | 08-12-2010 |
20100302453 | DETECTION OF GRADUAL TRANSITIONS IN VIDEO SEQUENCES - A technique is disclosed for detecting gradual transitions between frames of a video sequence such as fade and dissolve transitions. For each frame, the intensity values of pixels at corresponding positions within a window of frames including the subject frame are compared, and signs are allocated to the calculated differences. The number of each type of sign is determined for each pixel position and the larger number of matching signs is assigned as a measure of the monotonicity of the direction of intensity variations at the pixel position between the frame and the surrounding frames. A global monotonicity measure is then calculated for the frame as a whole using the monotonicity values for each pixel position. This is repeated for each frame to generate a temporal sequence of frame intensity change monotonicity measures. Slopes within this temporal sequence representative of gradual Transitions between video frames are detected. Alternatively, the values in the temporal sequence are compared with a threshold to identify values representative of gradual transitions between video frames. | 12-02-2010 |
20110080958 | MULTIMEDIA SIGNATURE CODING AND DECODING - A method and apparatus for coding and decoding the fingerprint of a multimedia item such as video or audio is disclosed. A multimedia content temporal, such as a video segment or audio segment, is described by a coarse fingerprint and a plurality of fine fingerprints, each fine fingerprint corresponding to a temporal sub-interval of said temporal interval, said temporal sub-interval typically being smaller than said temporal interval. One or more fine fingerprints are encoded in a non-predictive way, with no reference to the temporally neighbouring signatures, and one or more fine fingerprints are encoded in a predictive way, from the temporally neighbouring signatures. The predictive encoding entails computing the difference between neighbouring fine fingerprints to make up a prediction difference matrix, scanning said prediction difference matrix into a one dimensional vector by vectorising along rows or along columns or along diagonals or along any suitable scanning pattern, and performing lossless encoding on the one dimensional vector by an appropriate method, preferably selected, at least in part, based on the scanning method used. | 04-07-2011 |
Patent application number | Description | Published |
20090158323 | Method and apparatus for video navigation - A method of deriving a representation of a video sequence comprises deriving metadata expressing at least one temporal characteristic of a frame or group of frames, and one or both of metadata expressing at least one content-based characteristic of a frame or group of frames and relational metadata expressing relationships between at least one content-based characteristic of a frame or group of frames and at least one other frame or group of frames, and associating said metadata and/or relational metadata with the respective frame or group of frames. | 06-18-2009 |
20110033106 | METHODS OF REPRESENTING AND ANALYSING IMAGES - A method of representing and analysing images comprises producing a plurality of descriptors of an image at one or more scales and for one or more colour channels, said descriptors capturing colour content and interrelation information within the regions, and associating the descriptors in a plurality of ways based on their characteristics such as scale, colour channel, feature semantics, and region, and comparing such representations of images to assess the similarity of images. | 02-10-2011 |
20110038532 | METHODS OF REPRESENTING AND ANALYSING IMAGES - A method of representing at least one image comprises deriving at least one descriptor based on colour information and colour interrelation information for at least one region of the image, the descriptor having at least one descriptor element, derived using values of pixels in said region, wherein at least one descriptor element for a region is derived using a non-wavelet transform. The representations may be used for image comparisons. | 02-17-2011 |