Abstract: In one example, a method for low-latency multimedia stream reception and output in a receiving device is described. Data packets may be extracted from a multimedia stream received over a network. The sequence of independently decodable units associated with the multimedia stream may be decoded. Each independently decodable unit may include one or more data packets. The sequence of decoded units may be stored in an output buffer. Further, flow of the decoded units from the output buffer to an output device may be controlled based on one of (a) a latency associated with the decoded units and (b) a rate of reception of the decoded units by the output buffer and a rate at which the output device is operating. The decoded units may be rendered on the output device.

Abstract: In one example, a segment of media content, a predefined maximum bitrate, and a predefined maximum quality measure may be received. K-NN having similar bitrate and quality data to the segment of media content may be determined using a trained k-nearest neighbor model. The K-NN are determined from a training set of media content segments. Further, at least one content adaptive encoding parameter for the segment of media content may be determined within the predefined maximum bitrate and the predefined maximum quality measure using the determined k-nearest neighbor. The at least one content adaptive encoding parameter is inputted to an encoder to encode the segment of media content.

Abstract: A system includes an interface unit to receive a request, from a media client, to obtain a segment of media content at an ABR representation, and a transcoding unit. The transcoding unit includes a scalable decoder, hint stream decoder, and re-encoder. The scalable decoder receives and decodes a set of two or more layers of a scalable coded representation corresponding to the requested segment of media content at the requested ABR representation to provide a set of media frames and scalable stream information for the segment. The hint stream decoder receives and decodes a hint stream corresponding to the requested segment of media content at the requested ABR representation and the scalable stream information to provide transcoding hints for the segment. The re-encoder re-encodes the set of media frames using the transcoding hints to provide an encoded bit stream corresponding to the requested segment of media content.

Abstract: A method and system for encrypting data packets in a multimedia stream are disclosed. Each data packet includes a header portion and a payload portion. In one embodiment, one or more data packets are selected from an incoming multimedia stream. Further, one or more of a header portion and a payload portion are selected within the one or more data packets. Furthermore, one or more regions in the selected one or more of the header portion and the payload portion are encrypted using an encryption algorithm.

Abstract: A system and method for tone mapping on a high dynamic range (HDR) image of a scene are disclosed. In one embodiment, tone mapping on the HDR image is performed using a set of bit-depths, that corresponds to a plurality of images of the scene, obtained at each unit of an irradiance range of the scene.

Abstract: In one example, a sequence of pictures may be transformed at a given spatial resolution to a plurality of output spatial resolutions and/or an additional spatial resolution that is lower than the plurality of output spatial resolutions. The sequence of pictures and a picture type may be received for each of the pictures at respective output spatial resolutions. Estimating a set of combinations of encoding parameters for coding tree blocks (CTBs) in each of the pictures at a lowest output spatial resolution or mapping combinations of encoding parameters for each CTB in each of the pictures at an immediate coarser spatial resolution to corresponding blocks at the respective output spatial resolution is performed. A set of combinations of encoding parameters may be determined for each CTB and best combinations of encoding parameters from the determined set of combinations may be identified for encoding the sequence of pictures.

Abstract: A system and method for multi-bitrate and multi-spatial resolution media encoding are disclosed. In an embodiment for encoding a sequence of pictures at a given spatial resolution to an encoding format at a plurality of output bitrates, the sequence of pictures and a picture type for each of the pictures are received. Further, best combinations of encoding parameters for each coding tree block (CTB) in each of the pictures are identified from a determined set of combinations of encoding parameters supported by the encoding format for the associated picture type. Furthermore, the sequence of pictures are encoded using the best of the identified combinations of encoding parameters for each CTB in each of the pictures to create media bit streams at the plurality of output bitrates.

Abstract: A method for providing data channel virtualization between one or more devices and one or more applications is disclosed. In one example, a device policy manager (DPM) is initialized by creating an instance of the DPM before creating any application. Further, the DPM is configured for device management by identifying each device of the one or more devices and its associated device data channel (DDC) to be managed by the DPM. Each of the one or more devices is identified using an associated device identity (ID) and its corresponding DDC. Furthermore, one or more virtual data channels (VDCs) are created and provided to the one or more associated applications upon receiving a request from each of the one or more applications using a device identity (ID) and any application specific configuration parameters provided by the application.

Abstract: A method for media rate control in a video encoding system disclosed. In one embodiment, an optimal remaining one of the three parameter sets (Sk) is computed based on the provided user configuration inputs of two parameters sets (Si, Sj), wherein the user configuration inputs comprise two parameter sets (Si and Sj) out of three parameter sets (Si, Sj, and Sk), wherein the three parameter sets are latency parameter set, channel bandwidth parameter set, and video quality parameter set. The video encoding system is then configured based on the provided two parameter sets (Si, Sj) and the computed parameter set (Sk) to obtain a desired media rate control having optimal performance.

Abstract: A system and method for a low complexity and robust spatiotemporal combining for video enhancement is disclosed. In one embodiment, the method includes computing a standard deviation estimate between a video frame and a temporally neighboring frame of the video frame in a video sequence, computing an error value, for each sub-block of pixels within a block of pixels in a current video frame, between pixel values within the sub-block in the current video frame and corresponding motion compensated pixel values in a temporally neighboring video frame of the current video frame, computing a temporal weighting factor for each sub-block of pixels as a function of the error value and the standard deviation estimate, and combining the block of pixels in the current video frame and their corresponding motion compensated pixel values in the temporally neighboring video frame using the computed temporal weighting factor.

Abstract: A system, method and architecture for in-built media enabled personal collaboration on endpoints are disclosed. In one embodiment, one or more personal communication modified video communication terminals (PCMVCTs), one or more of video communication terminals (VCTs), one or more of voices over IP communication terminals (VoCTs), one or more remote servers and/or one or more clients are communicatively coupled via an IP network. Further, the PCMVCT includes a personal collaboration enabling audio/video bridging module (PCEAVBM). Furthermore, the personal collaboration between participants while providing an audio/video bridging of incoming audio/video streams from the one or more PCMVCTs, one or more of VCTs and VoCTs via the IP network is enabled by the PCEAVBM.

Abstract: A method for generating a high dynamic range (HDR) image from images of a scene obtained at one or more exposure values is disclosed. In this embodiment, one of the obtained images is selected as a reference image. Further, mapped images are obtained by mapping pixel intensity values to corresponding irradiance values in each image. Furthermore, a pixel intensity value dependent weighting factor is determined. Moreover, a set of images is identified from the mapped images for pixels in the reference image. Also, a set of corresponding mapped pixels is established for the mapped pixels in reference image in the set of images. Further, a similarity measure is computed for the mapped pixels of reference image and corresponding mapped pixels in the set of images. Furthermore, each mapped pixel of the reference image is combined with a subset of its established corresponding mapped pixels in the set of images.

Abstract: A system and method for determining rotation invariant feature descriptors for points of interest in digital images for image matching are disclosed. In one embodiment, a point of interest in each of two or more digital images is identified. Further, the digital images are transformed to change location of the point of interest in each of the digital images to a principal point. Furthermore, a rotation invariant feature descriptor is determined for the point of interest in each of the transformed digital images for image matching.

Abstract: A method for providing a dedicated software framework for exception and event management in an embedded software system is disclosed. In one embodiment, each of exceptions/events originated from users are uniquely identified and severity of the exceptions/events is categorized. The users are software subsystems, software layers and software modules in the embedded software system. Further, information regarding the exceptions/events is reported through various layers, subsystems and modules for use by an application. Furthermore, information associated with one or more of the reported exceptions/events is logged using a logging framework. In addition, the exceptions/events are handled to keep applications running without causing an unexpected behavior in the embedded software system.

Abstract: A system and method for tone mapping on a high dynamic range (HDR) image of a scene are disclosed. In one embodiment, tone mapping on the HDR image is performed using a set of bit-depths, that corresponds to a plurality of images of the scene, obtained at each unit of an irradiance range of the scene.

Abstract: A system and method for ensuring buffer compliance in a moving picture experts group 2 (MPEG2) transport stream (TS) system is disclosed. In one embodiment, a plurality of encoded audio/video (A/V) streams is categorized into a first group and a second group. Further, interleaving bits and a number of bytes to be sent are computed for each encoded A/V stream in the first group and the second group, respectively. Furthermore, an encoded A/V stream is selected based on the computed interleaving bits and number of bytes to be sent, respectively. In addition, one or more TS packets are generated by packetizing data in one or more frames in the selected encoded A/V stream based on program clock reference (PCR) and decode time stamp (DTS) associated with the one or more frames to ensure buffer compliance in the MPEG2 TS system.

Abstract: A method and system for peak limiting of speech signals for delay sensitive voice communication is disclosed. In an embodiment, a position of a sample with highest magnitude within a current block of samples is determined. Further, a peak gain to be applied for the current block of samples to bring down the highest magnitude to a predetermined threshold value is determined. Furthermore, a gain delta by which an old gain is updated to the peak gain is computed. Then, a gain factor is computed for the current block of samples based on the position of the sample with highest magnitude and the gain delta. Subsequently, the gain factor is set to a predetermined minimum gain factor when the computed gain factor is less than the predetermined minimum gain factor. In addition, gain is applied to the current block of samples using the gain factor.

Abstract: A system and a method for iris detection in a face region of a digital image are disclosed. In one embodiment, iris is detected in the face region of the digital image using eye features, such as a shape of the iris and/or luminance values of a sclera region.

Abstract: A flexible and scalable software system architecture for implementing multimedia applications is disclosed. In one embodiment, the flexible and scalable software system architecture includes a platform abstraction layer (PAL), a device policy manager (DPM), a media engine, a library of commons (LoC) module, system management toolsets (SMT), one or more application services, an application control unit (ACU) and a user interface transaction layer (UITL). Further, the media engine is communicatively coupled between the PAL and the ACU, the LoC module is communicatively coupled to the ACU, the DPM, the media engine, the SMT, the PAL and the UITL, the DPM is communicatively coupled to the PAL, the ACU and the media engine, the ACU is coupled between media engine and the UITL, and the SMT is communicatively coupled to the ACU, the DPM, the media engine, the LoC module, the PAL and the UITL.

Abstract: A method for low complexity change detection in a sequence of images using configurable block sizes is disclosed. In one embodiment, a first change detection map is generated by performing change detection based on configurable block sizes between a current image and one of an estimated first background image and a previous image. The first change detection map classifies each block as changed or unchanged. The selection between the previous image and the estimated background image for use in change detection is done using a confidence estimate, which is updated both at the low level and at the end of a high-level change analysis. In another embodiment, an estimated second background image is used in addition to the estimate first background image to help quickly adapt when a stationary object starts moving or when a scene object becomes stationary.