Abstract: The embodiments herein provide a method and system for providing an image based mobile augmented reality. The system comprises a mobile device comprising a camera for capturing plurality of images, a display screen for displaying results, a GPS module for determining geographical coordinates, an input interface and a client application including a client-side database; and a central server comprising a server-side database and an image matching and ranking module comprising one or more image matching algorithms for performing an image search. The method comprises capturing a query image, transmitting query data to the central server, applying one or more image matching and ranking algorithms to identify database images matching to the search query, extracting relevant information, presenting the extracted relevant information as search results to the user and providing an option to the user to interactively communicate with the system.

Abstract: A signal which is to be quality-improved often suffers from the quality degradation in the spatial high frequency region more than compared to the spatial low frequency region. Accordingly a quality improvement is performed efficiently by combining the signal to be quality improved with a high frequency portion extracted from a sparse approximation of the signal to be quality improved.

Abstract: A scalable video decoder is described which is configured to reconstruct a base layer signal from a coded data stream to obtain a reconstructed base layer signal; and reconstruct an enhancement layer signal including spatially or temporally predicting a portion of an enhancement layer signal, currently to be reconstructed, from an already reconstructed portion of the enhancement layer signal to obtain an enhancement layer internal prediction signal; forming, at the portion currently to be reconstructed, a weighted average of an inter-layer prediction signal obtained from the reconstructed base layer signal, and the enhancement layer internal prediction signal to obtain an enhancement layer prediction signal such that a weighting between the inter-layer prediction signal and the enhancement layer internal prediction signal varies over different spatial frequency components; and predictively reconstructing the enhancement layer signal using the enhancement layer prediction signal.

Abstract: A subblock-based coding of transform coefficient blocks of the enhancement layer is rendered more efficient. To this end, the subblock subdivision of the respective transform coefficient block is controlled on the basis of the base layer residual signal or the base layer signal. In particular, by exploiting the respective base layer hint, the subblocks may be made longer along a spatial frequency axis transverse to edge extensions observable from the base layer residual signal or the base layer signal.

Abstract: The coding efficiency of scalable video coding is increased by substituting missing spatial intra prediction parameter candidates in a spatial neighborhood of a current block of the enhancement layer by use of intra prediction parameters of a co-located block of the base layer signal. By this measure, the coding efficiency for coding the spatial intra prediction parameters is increased due to the improved prediction quality of the set of intra prediction parameters of the enhancement layer, or, more precisely stated, the increased likelihood, that appropriate predictors for the intra prediction parameters for an intra predicted block of the enhancement layer are available thereby increasing the likelihood that the signaling of the intra prediction parameter of the respective enhancement layer block may be performed, on average, with less bits.

Abstract: Information available from coding/decoding the base layer, i.e. base-layer hints, is exploited to render the motion-compensated prediction of the enhancement layer more efficient by more efficiently coding the enhancement layer motion parameters.

Abstract: Scalable video coding is rendered more efficient by deriving/selecting a subblock subdivision to be used for enhancement layer prediction, among a set of possible subblock subdivisions of an enhancement layer block by evaluating the spatial variation of the base layer coding parameters over the base layer signal. By this measure, less of the signalization overhead has to be spent on signaling this subblock subdivision within the enhancement layer data stream, if any. The subblock subdivision thus selected may be used in predictively coding/decoding the enhancement layer signal.

Abstract: A system, method and a computer program product for handling text distracters in a visual search have been disclosed. The system considers an image captured on a handheld device, as a query image and subsequently identifies the textual portions of the query image. The textual portions of the query image are smoothened in order to reduce the keypoints present in the textual portions. Non-textual portions in proximity to the textual portions are also selectively smoothened in order to prevent formation of an artificial border between the textual portions and non-textual portions. Further, the features are extracted from the non-textual portions of the query image are compared with the features of the images stored in a repository. An image whose features match with the extracted features is identified as an image relevant to the query image, and the identified image is transmitted, along with the associated metadata to the handheld device for display.

Abstract: In accordance with a first aspect, the intra prediction direction of a neighboring, intra-predicted block is used in order to predict the extension direction of the wedgelet separation line of a current block, thereby reducing the side information rate necessitated in order to convey the partitioning information. In accordance with a second aspect, the idea is that previously reconstructed samples, i.e. reconstructed values of blocks preceding the current block in accordance with the coding/decoding order allow for at least a prediction of a correct placement of a starting point of the wedgelet separation line, namely by placing the starting point of the wedgelet separation line at a position of a maximum change between consecutive ones of a sequence of reconstructed values of samples of a line of samples extending adjacent to the current block along a circumference thereof. Both aspects may be used individually or in combination.

Abstract: The embodiments herein provide a method and system for providing an image based mobile augmented reality. The system comprises a mobile device comprising a camera for capturing plurality of images, a display screen for displaying results, a GPS module for determining geographical coordinates, an input interface and a client application including a client-side database; and a central server comprising a server-side database and an image matching and ranking module comprising one or more image matching algorithms for performing an image search. The method comprises capturing a query image, transmitting query data to the central server, applying one or more image matching and ranking algorithms to identify database images matching to the search query, extracting relevant information, presenting the extracted relevant information as search results to the user and providing an option to the user to interactively communicate with the system.

Abstract: Wedgelet separation lines of neighboring blocks are predicted from each other by aligning the wedgelet separation lines of such neighboring blocks to each other, thereby reducing the side information coding rate that may be used.

Abstract: Although wedgelet-based partitioning seems to represent a better tradeoff between side information rate on the one hand and achievable variety in partitioning possibilities on the other hand, compared to contour partitioning, the ability to alleviate the constraints of the partitioning to the extent that the partitions have to be wedgelet partitions, enables applying relatively uncomplex statistical analysis onto overlaid spatially sampled texture information in order to derive a good predictor for the bi-segmentation in a depth/disparity map. Thus, in accordance with a first aspect it is exactly the increase of the freedom which alleviates the signaling overhead provided that co-located texture information in form of a picture is present. Another aspect pertains the possibility to save side information rate involved with signaling a respective coding mode supporting irregular partitioning.

Abstract: The way of predicting a current block by assigning constant partition values to the partitions of a bi-partitioning of a block is quite effective, especially in case of coding sample arrays such as depth/disparity maps where the content of these sample arrays is mostly composed of plateaus or simple connected regions of similar value separated from each other by steep edges. The transmission of such constant partition values would, however, still need a considerable amount of side information which should be avoided. This side information rate may be further reduced if mean values of values of neighboring samples associated or adjoining the respective partitions are used as predictors for the constant partition values.

Abstract: A hybrid video decoder has an extractor, a predictor and a reconstructor. The extractor is configured to extract motion information and residual information for a first block of a current picture from a data stream. The predictor is configured to provide, depending on the motion information, a prediction for the block of the current picture by interpolating a reference picture, using a combination of an IIR filter and FIR filter. The reconstructor is configured to reconstruct the current picture at the block using the prediction for the block and the residual information for the block. Furthermore, a hybrid video encoder, a data stream, a method for encoding a video and a method for decoding a video are described.