2-D DFT-DWT Application to Multidimensional Signal Processing

Tan, Xiao; Hu, Shaohai; Xiao, Yang

doi:10.1109/icosp.2006.345596

Cited by 5 publications

(6 citation statements)

References 8 publications

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“…The directional 2-D hybrid transform combines the advantages of the 2-D hybrid transform DCT-DWT and DFT-DWT in right angle coordinate [7][8][9][10]. Comparison with the hybrid 2-D DCT-DWT and DFT-DWT of [7][8][9][10], the proposed 2-D transform is multiple directional rather than vertical and horizontal only. Thus we can processing 2-D signals with different direction, and the 2-D hybrid transform overcomes the disadvantage that the single DWT or 2-D DWT is hard to remove the interference of the narrow-band frequency.…”

Section: Discussionmentioning

confidence: 99%

“…Because of the deficiency of DCT and DWT themselves, namely DCT is hard to remove the interference of the wide-band frequency, and DWT is hard to remove the interference of the narrow-band frequency [7][8][9][10] k n X R θ , its inverse 1-D partial directional DCT is defined as…”

Section: Directional Dct-dwt Hybrid Transformmentioning

confidence: 99%

“…As so far, several approaches inhibiting the speckle noise have been proposed, including median filter, low-pass filter, DWT, DCT and so on [4][5][6][7][8][9][10]. Though 1-D and 2-D wavelet transform have good time-frequency property and multi-resolution [8][9][10], it can not denoise the speckle noise in ultrasound image very well because of lacking multi-orientation when combined with threshold method. This shortage also makes the selection of the threshold for 1-D and 2-D wavelet transform not to be flexible, which influences the de-noising performance for speckles in a certain degree.…”

Section: Introductionsmentioning

confidence: 99%

“…According to the orientation characteristic of sectorial ultrasound image, the paper combines the advantage of hybrid DCT-DWT(DFT-DWT) in right angle coordinate [8][9][10] , proposes 2-D directional DCT-DWT hybrid transform. According to different orientations, the proposed rays' or arts' DCT and DWT can select different thresholds or inhibit noise frequency components for speckle de-noising.…”

Section: Introductionsmentioning

confidence: 99%

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The 2-D directional DCT-DWT hybrid transform and its application in denoising ultrasound image

Wen

Xiao

2008

2008 9th International Conference on Signal Processing

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Conventional 2-D discrete cosine transform (DCT) and 2-D discrete wavelet transform (DWT) have not been taken image orientation information into account. At the same time, to remove the speckle noise in ultrasound image is also a hard nut to crack. Based on above two issues, aiming at the sectorial ultrasound image, the paper proposes directional DCT-DWT hybrid transform. The proposed rays' or arts' DCT and DWT can be adopted for an image after the coordinate transform for the pixels of the image. Since the radiate wave directions are considered, the algorithm based proposed 2-D hybrid transform can inhibit the speckle noise of the ultrasound images. The experiment result verifies the proposed algorithm to be valid.

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Section: Discussionmentioning

confidence: 99%

Section: Directional Dct-dwt Hybrid Transformmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

See 2 more Smart Citations

The 2-D directional DCT-DWT hybrid transform and its application in denoising ultrasound image

Wen

Xiao

2008

2008 9th International Conference on Signal Processing

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“…This treatment can remove high the frequency interference and realize image recovery. Then using Fourier inverse transformation to obtain the processing result of image [4,5]. Image ) , ( y x f corresponding to the Fourier spectrum is ) , ( v u F , the two-dimensional discrete Fourier transform of this image can be expressed as:…”

Section: Fourier Transform Of Billet Imagementioning

confidence: 99%

Research for Billet Limited Weight Cutting Based on Behavior Stateflow

Wang

Zeng

et al. 2016

MATEC Web Conf.

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Abstract. It is critical to improve the yield of rolled products and reduce the energy consumption based on billet limited weight cutting. The effect on billet limited weight by dimensional accuracy of billet image and billet casting speed is analyzed, and the behaviour control architecture of billet limited weight cutting is established. The goals of billet limited weight cutting is decomposed into cutting tasks and cutting actions based on finite-state machine theory. The theoretical weight, the integral weight and the predicted weight as the state switching conditions of behaviour control model, so that the billet limited weight cutting is realized. The model of construction is beneficial for the autonomous behaviour control of billet limited weight cutting.

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2-D hybrid transform and feature extracting algorithm of fatty liver ultrasonic images

Xiao

Zhang

2008

2008 9th International Conference on Signal Processing

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2-D DFT-DWT Application to Multidimensional Signal Processing

Cited by 5 publications

References 8 publications

The 2-D directional DCT-DWT hybrid transform and its application in denoising ultrasound image

The 2-D directional DCT-DWT hybrid transform and its application in denoising ultrasound image

Research for Billet Limited Weight Cutting Based on Behavior Stateflow

2-D hybrid transform and feature extracting algorithm of fatty liver ultrasonic images

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