Optimal wavelet filter banks for regularized restoration of noisy images

Stephanakis, Ioannis M.; Kollias, Stefanos

doi:10.1007/bf01212465

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…[24], [27], [28], [29], [33]. Many of these recent efforts focused on reducing the filter's hardware complexity [2], [19], [10], [21].…”

Section: Discussionmentioning

confidence: 99%

A Novel Genetic Algorithm for the Design of a Signed Power-of-Two Coefficient Quadrature Mirror Filter Lattice Filter Bank

Lim

2002

Circuits Syst Signal Process

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A novel genetic algorithm (GA) for the design of a canonical signed powerof-two (SPT) coefficient lattice structure quadrature mirror filter bank is presented in this paper. Genetic operations may render the SPT representation of a value noncanonical. In this paper, a new encoding scheme is introduced to encode the SPT values. In this new scheme, the canonical property of the SPT values is preserved under genetic operations. Additionally, two new features that drastically improve the performance of our GA are introduced. (1) An additional level of natural selection is introduced to simulate the effect of natural selection when sperm cells compete to fertilize an ovule; this dramatically improves the offspring survival rate. A conventional GA is analogous to intracytoplasmic sperm injection and has an extremely low offspring survival rate, resulting in very slow convergence.(2) The probability of mutation for each codon of a chromosome is weighted by the reciprocal of its effect. Because of these new features, the performance of our new GA outperforms conventional GAs.

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“…[24], [27], [28], [29], [33]. Many of these recent efforts focused on reducing the filter's hardware complexity [2], [19], [10], [21].…”

Section: Discussionmentioning

confidence: 99%

A Novel Genetic Algorithm for the Design of a Signed Power-of-Two Coefficient Quadrature Mirror Filter Lattice Filter Bank

Lim

2002

Circuits Syst Signal Process

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“…[1]- [3]. The basic function of QMF is to split a signal into number of successive frequency bands so that the signal of each frequency sub-band can be processed independently [4].…”

Section: Introductionmentioning

confidence: 99%

Multiplier-less implementation of quadrature mirror filter

Barsainya

Aggarwal

Rawat

2015

2015 4th International Conference on Reliability, Infocom Technologies and Optimization (ICRITO) (Trends and Future Directions)

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The minimum hardware and low power dissipation have always been the main concern for the efficient filter implementation. In this paper, an efficient way of implementing the lattice wave digital filter (LWDF) structure of the quadrature mirror filter (QMF) with canonic signed digit (CSD) coefficients is proposed. Further, the proposed structure is implemented using carry save adders rather than slow carry propagation adders. This increases the speed of the overall filter structure compared to the conventional way of implementing the filter with CSD coefficients. The proposed QMF is implemented and successfully tested on Xilinx Spartan XC3s200-4ft256 field programmable gate array (FPGA) device. The effectiveness of the proposed design method is proven with an example.

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“…To overcome this problem, many algorithms, mainly modified forms of median filters, have been proposed [2-9, 11-19, 21-23]. Different approaches have also been addressed, such as those proposed in [1,20].…”

Section: Introductionmentioning

confidence: 99%

“…In [20], an optimal wavelet filter banks method is used instead of a Laplacian smoothing filter for image restoration. In [1], a robust recursive inverse algorithm is proposed to restore images which are mainly corrupted by impulsive noise with low signal-to-noise ratio.…”

Section: Introductionmentioning

confidence: 99%

Efficient Restoration Method for Images Corrupted with Impulse Noise

Ramadan

2011

Circuits Syst Signal Process

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This paper proposes a two-stage adaptive method for restoration of images corrupted with impulse noise. In the first stage, the pixels which are most likely contaminated by noise are detected based on their intensity values. In the second stage, an efficient average filtering algorithm is used to remove those noisy pixels from the image. Only pixels which are determined to be noisy in the first stage are processed in the second stage. The remaining pixels of the first stage are not processed further and are just copied to their corresponding locations in the restored image. The experimental results for the proposed method demonstrate that it is faster and simpler than even median filtering, and it is very efficient for images corrupted with a wide range of impulse noise densities varying from 10% to 90%. Because of its simplicity, high speed, and low computational complexity, the proposed method can be used in realtime digital image applications, e.g., in consumer electronic products such as digital televisions and cameras.

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Optimal wavelet filter banks for regularized restoration of noisy images

Cited by 6 publications

References 16 publications

A Novel Genetic Algorithm for the Design of a Signed Power-of-Two Coefficient Quadrature Mirror Filter Lattice Filter Bank

A Novel Genetic Algorithm for the Design of a Signed Power-of-Two Coefficient Quadrature Mirror Filter Lattice Filter Bank

Multiplier-less implementation of quadrature mirror filter

Efficient Restoration Method for Images Corrupted with Impulse Noise

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