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This paper presents a Discrete Tchebichef Transform (DTT) based hybrid embedded coder for image compression applications. In this coder, DTT is coupled with Set partitioning in hierarchical coding techniques (SPIHT). Further, human visual system (HVS) with appropriate perceptual weights are applied to improve the perceptual quality of the reconstructed image. The compression and image reconstructon...
Discrete cosine transform (DCT) is widely used in image and video compression standards. This paper presents distributed arithmetic (DA) based VLSI architecture of DCT for low hardware circuit cost as well as low power consumption. Low hardware cost is achieved by exploiting redundant computational units in recent literature. A technique to reduce error introduced by sign extension is also presented...
This paper presents a novel fuzzy logic controller in conjunction with phase locked loop synchronization based shunt Active Power Filter (APF) for harmonics and reactive power compensation in the distribution grid due to the non-linear loads. The Mamdani-type fuzzy logic is adpted and this controller is linguistic description, so it does not require a mathematical calculations. The active power filter...
The Discrete Tchebichef Moment (DTM) is a linear orthogonal transform which has higher energy compactness property like other orthogonal transform. It is recently found applications in image analysis and compression. This paper proposes a new approach of fast zigzag pruning algorithm of 4×4 DTM coefficients. The principal ideal of the proposed algorithm is to make use of the distributed arithmetic...
This paper presents a five-level cascaded multilevel Voltage Source Inverter (VSI) based shunt active filter for Power Line Conditioners (PLC) to improve power quality. The reference current extraction is based on sensing main currents that are multiplied with estimated peak reference current. The proposed approach comprises Low Pass Filter (LPF) in conjunction with Proportional Integral (PI) controller...
This paper presents shunt active power line conditioners for power quality improvement such as harmonics and reactive power compensation due to non-linear loads. The novel compensation control strategy is based on positive sequence voltage detector with generalized Fryze currents minimization, an approach different from conventional methods; the purpose is to guarantee linearity between the supply...
As the circuit complexity is increasing in demand for the more computations on a single VLSI chip, low power VLSI design has become important specially for portable devices powered by battery. Digital camera is one of them where realtime image capturing, compression and storage of compressed image data is done. Most of the digital camera implement JPEG baseline algorithm to store highly compressed...
Discrete cosine transform (DCT) is usually used in JPEG based image transform coding. This paper presents separable 2-D discrete Hartley transform (SDHT) and its Distributed Arithmetic (DA) based hardware architecture as an alternate to DCT in transform based coding of image compression. The proposed DA architecture for 1-D DHT has very less computations as compared to existing 1-D DCT. The proposed...
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