Ittiam Systems (p) Ltd.

Murali Babu Muthukrishnan

Sriram Sethuraman

Arvind Raman

Sankaranarayanan Parameswaran

Dileep Kumar Tamia

Manish Singhal

Bhavani Gopalakrishna Rao

Hamsalekha Sridhara

Srinivasan Ekabaram

Omkar Kedarnath Sastry

Shailesh Ramamurthy

Aditya P Kulkarni

Swapan Kumar Kundu

Arunkumar Mohananchettiar

Dinesh Kumar

In an example, a method for delivering a multimedia data stream includes determining a frequency for generating one or more repair packets and a placement for positioning the one or more repair packets in the multimedia data stream based on a configuration parameter related to the multimedia data stream. The frequency and the placement may be determined based on a priority derived from a multimedia delivery use-case. Further, the method includes generating the one or more repair packets by network coding source packets of the multimedia data stream based on the determined frequency and the placement and transmitting the network coded multimedia data stream with the repair packets to a receiving device.

Placement of repair packets in multimedia data streams

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.

Content delivery edge storage optimized media delivery to adaptive bitrate (ABR) streaming clients

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.

System and method for iris detection in digital images

A method and architecture for face detection under varying light conditions, tilt levels, different color characteristics of faces in a digital image are disclosed. In one embodiment, skin pixels in the digital image are selected. Any unselected pixels are then classified into bright pixels and dark pixels. Skin pixels are then selected from the bright pixels. Skin pixels are further selected from the dark pixels. All the skin pixels are then grouped into windows. Any window having skin pixels that is more than or equal to a predetermined number of skin pixels is then declared as a skin window. Candidate face regions are then formed by grouping the skin windows. Boundaries of candidate face regions are then determined. Eye regions are then determined in the boundaries of candidate face regions. Each candidate face region is then declared as a face, if the eye regions are determined in it.

System and method for face detection in digital images

A motion estimation algorithm finds the best match for a given block or macroblock so that the resulting error signal has very low energy level which is computed, for e.g., by the SAD method. The motion estimation algorithm also provides for an optional sub-pixel level estimation and an inter4v search, and allows for restricting the number of searches for a Frame-frame ME (motion estimation) using Top-Top and Bottom-Bottom field MEs. The algorithm provides for a selective early exit and enables selecting a suitable search area with N candidate points (4 to 8) for starting the search. The search is conducted progressively till a minimum error signal (low energy level signal) is reached. The candidate points for search may be in a diamond shaped configuration, and there may be a plurality of successive diamond configurations, the number of which is configurable. The invention has application in MPEG-4 and H.264 standards.

Fast motion-estimation scheme

A method for achieving bit rate controlled encoding, e.g., constant bit rate, uses a bit rate control model based on bits allocated per macroblock and based on error in estimating bits consumed in an encoding process in a macroblock. The method computes bits consumed per macroblock as a function of the formed bit rate control model, and allocates bits for the macroblock. To this end, a quadratic (second order) equation is used for the model, which equation might default into a first order equation requiring fewer computations, in the event that no second order solutions exist. In one form, the bit rate control model computes the bit rate to satisfy video buffer verifier (VBV) compliance in accordance with MPEG requirements. The bit rate control model makes allowances for the type of macroblock, i.e., inter, intra or bidirectional, and provides for any frame-skips.

Model based bit rate control for a macroblock encoder

A method for designing a multi-threaded processing operation that includes, e.g., multimedia encoding/decoding, uses an architecture having multiple processors and optional hardware accelerators. The method includes the steps of: identifying a desired chronological sequence of processing stages for processing input data including identifying interdependencies of said processing stages; allotting each said processing sage to a processor; staggering the processing to accommodate the interdependencies; selecting a processing operation based on said allotting to arrive at a subset of possible pipelines that offer low average processing time; and, choosing one design pipeline from said subset to result in overall timing reduction to complete said processing operation. The invention provides a multi-threaded processing pipeline that is applicable in a System-on-Chip (SoC) using a DSP and shared resources such as DMA controller and on-chip memory, for increasing the throughput. The invention also provides an article which is programmed to execute the method.

Multi-threaded processing design in architecture with multiple co-processors

Efficient techniques are provided to detect and correct channel errors found in an encoded video signal. In one example embodiment, header and global information in a video frame is analyzed to detect channel errors in the video frame. The video frame is then corrected for detected channel errors by isolating the detected channel errors to a few macroblocks in the video frame to reduce data loss and improve video quality.

System, method, and apparatus for error recovery in coded video signals

Efficient techniques are provided to detect and correct channel errors found in an encoded video signal. In one example embodiment, header information in a video frame is analyzed to detect channel errors in the video frame. The video frame is then corrected for detected channel errors by isolating the detected channel errors to a few macroblocks in the video frame to reduce data loss and improve video quality.

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Bengaluru, India

Murali Babu Muthukrishnan