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Dive into the research topics where Ajit Deepak Gupte is active.

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Featured researches published by Ajit Deepak Gupte.


IEEE Transactions on Circuits and Systems for Video Technology | 2011

Memory Bandwidth and Power Reduction Using Lossy Reference Frame Compression in Video Encoding

Ajit Deepak Gupte; Bharadwaj Amrutur; Mahesh Mehendale; Ajit Venkat Rao; Madhukar Budagavi

Large external memory bandwidth requirement leads to increased system power dissipation and cost in video coding application. Majority of the external memory traffic in video encoder is due to reference data accesses. We describe a lossy reference frame compression technique that can be used in video coding with minimal impact on quality while significantly reducing power and bandwidth requirement. The low cost transformless compression technique uses lossy reference for motion estimation to reduce memory traffic, and lossless reference for motion compensation (MC) to avoid drift. Thus, it is compatible with all existing video standards. We calculate the quantization error bound and show that by storing quantization error separately, bandwidth overhead due to MC can be reduced significantly. The technique meets key requirements specific to the video encode application. 24-39% reduction in peak bandwidth and 23-31% reduction in total average power consumption are observed for IBBP sequences.


Journal of Low Power Electronics | 2009

Adaptive Global Elimination Algorithm for Low Power Motion Estimation

Ajit Deepak Gupte; Amrutur Bharadwaj

Motion estimation typically consumes 50% to 70% of total power in video encode application. Optimizing the power consumption of motion estimation process is of great importance to low power video applications. Power dissipation increases with computational complexity. Reduction in motion estimation complexity is usually associated with increase in bit rate and a loss of quality. We explore a set of algorithms that reduce the complexity of motion estimation by adaptively changing the matching complexity based on macro-block features yet have only a modest cost in terms of bit rate increase and quality loss. The adaptive techniques are applied to the global elimination algorithm, which is a well known motion estimation algorithm. The global elimination algorithm uses fixed partition sizes and shapes irrespective of the nature of the macro-block. We show that by adapting the partition sizes and shapes according to the macro-block features such as variance and Hadamard coefficients, the computational complexity of global elimination algorithm can be significantly reduced with only a small increase in bit rate. We also propose a novel center-biased search order that uses early termination method designed to work with the global elimination algorithm. The adaptive match and center-biased search together result in around 57% reduction in computational complexity and 50% reduction in power dissipation compared to the original global elimination algorithm.


international conference on multimedia and expo | 2008

An adaptive, feature-based low power motion estimation algorithm

Ajit Deepak Gupte; Amrutur Bharadwaj

Motion Estimation is one of the most power hungry operations in video coding. While optimal search (eg. full search) methods give best quality, non optimal methods are often used in order to reduce cost and power. Various algorithms have been used in practice that trade off quality vs. complexity. Global elimination is an algorithm based on pixel averaging to reduce complexity of motion search while keeping performance close to that of full search. We propose an adaptive version of the global elimination algorithm that extracts individual macro-block features using Hadamard transform to optimize the search. Performance achieved is close to the full search method and global elimination. Operational complexity and hence power is reduced by 30% to 45% compared to global elimination method.


international conference on vlsi design | 2001

Performance considerations in embedded DSP based system-on-a-chip designs

Ajit Deepak Gupte; Mahesh Mehendale; Ramesh Ramamritham; Deepa Nair

Embedded DSP applications require large amount of high performance memory. Todays DSP systems typically have more than a megabit of on-chip memory, as compared to less than a hundred kilo-bits a few years ago. Memory performance can easily become a bottleneck in the system performance. This problem is compounded by the increasing interconnect delay factor at sub-micron technology. A high performance DSP core cannot alone guarantee a high performance system. In this paper, we address the challenges encountered in a high performance embedded DSP based design. We describe performance enhancing techniques ranging from careful physical placement, and logic design to optimal repeater insertion and buffering schemes. A methodology that efficiently addresses the interconnect effects is presented.


Journal of Low Power Electronics | 2009

Adaptive Global Elimination Algorithm for Low Power Motion Estimation (Journal of Low Power Electronics, Vol. 5, pp. 1–16 (2009))

Ajit Deepak Gupte; Amrutur Bharadwaj

Motion estimation typically consumes 50% to 70% of total power in video encode application. Optimizing the power consumption of motion estimation process is of great importance to low power video applications. Power dissipation increases with computational complexity. Reduction in motion estimation complexity is usually associated with increase in bit rate and a loss of quality. We explore a set of algorithms that reduce the complexity of motion estimation by adaptively changing the matching complexity based on macro-block features yet have only a modest cost in terms of bit rate increase and quality loss. The adaptive techniques are applied to the global elimination algorithm, which is a well known motion estimation algorithm. The global elimination algorithm uses fixed partition sizes and shapes irrespective of the nature of the macro-block. We show that by adapting the partition sizes and shapes according to the macro-block features such as variance and Hadamard coefficients, the computational complexity of global elimination algorithm can be significantly reduced with only a small increase in bit rate. We also propose a novel center-biased search order that uses early termination method designed to work with the global elimination algorithm. The adaptive match and center-biased search together result in around 57% reduction in computational complexity and 50% reduction in power dissipation compared to the original global elimination algorithm.


ieee computer society annual symposium on vlsi | 2008

Memory Power Modeling - A Novel Approach

Ajit Deepak Gupte; Mohit Sharma; Gaurav Kumar Varshney; Lakshmikantha V. Holla; Parvinder Kumar Rana; H Udayakumar

Low power consumption is a key requirement in mobile and other embedded applications. Accurate power estimation during design phase is a key enabler for designing a power optimized SoC. Abstracting accurate power models for complex IPs such as embedded memories is a challenging task. At the same time, the complex modules have a large share in total power consumption of an IC. In this paper we analyze various challenges in accurately modeling power of embedded memories and propose a novel approach to model power within the framework of existing power analysis methodology.


Archive | 1999

Method and apparatus for combining memory blocks for in circuit emulation

Venkatesh Natarajan; Ajit Deepak Gupte


Archive | 2002

Increasing possible test patterns which can be used with sequential scanning techniques to perform speed analysis

Ajit Deepak Gupte; Shankaranarayana Karantha Deshamangala; Amit Brahme; Jais Abraham


Archive | 2012

Methods and systems for chroma residual data prediction

Ajit Deepak Gupte; Ranga Ramanujam Srinivasan


Archive | 2002

Forwarding the results of operations to dependent instructions more quickly via multiplexers working in parallel

Ajit Deepak Gupte; Amitabh Menon

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Amrutur Bharadwaj

Indian Institute of Science

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