Improved measurement of dynamic modulation transfer functions on display using pursuit camera method based on wavelet-denoising method

Hsu, Shau-Wei; Chang, Chin Sung; Chung, Zong-Ying; Wu, Kuei-Neng

doi:10.1007/s10043-011-0014-2

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…For approaching the perception of human vision (removing the sine wave), the noise‐assisted data analysis introduces white noise into the wavelet denoise method to flatten the upper portion of the ESF, as shown in Fig. (d) . Next, the maximum and minimum is determined by the upper and lower portions of the average of ESF, and ESF is normalized, as shown in Fig.…”

Section: Edge Spread Function Analysis and Spatial Frequency Responsementioning

confidence: 99%

Measurement of binocular disparity in polarized based stereoscopic display by using digital camera

et al. 2013

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This work presents an image displacement measurement by using a box pattern and the edge spread function analysis in the polarized based stereoscopic displays. The measurement determines to identify three factors (i.e., box size, image displacement, and spatial frequency response (SFR)) from the box patterns. The polarized based stereoscopic displays might sacrifice pixels for producing 3D images, which might produce errors in the image displacement and then affect the depth perception indirectly. Based on the measurement, the errors can be quantified by using the three factors. Owing to the light leakage distorting the edge spread function to obtain an inferior SFR, exactly how light leakage affects the edge spread function can be resolved on the basis of the SFR results, especially at a frequency (1/display pixel) of 1.9 in the case of the horizontal displacement. Light leakage also induces the error of the box height in even and odd intervals of the vertical displacements more than 2 pixels and 0.5 pixels, respectively. The image displacement measurement provides a simple and comprehensive means of evaluating the optical characteristics, disparity, and sharpness of the stereoscopic displays, via the three factors.

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Section: Edge Spread Function Analysis and Spatial Frequency Responsementioning

confidence: 99%

Measurement of binocular disparity in polarized based stereoscopic display by using digital camera

et al. 2013

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“…Most of them have been proved to be effective in removing the unwanted components. For example, Hsu et al succeeded in removing the aliasing on the original step-edge response curve (SRC) caused by the binning of Moire patterns [2]. However, the linear filtering methods are not very effective when the signals contain sharp edges and impulses of short duration [3].…”

Section: Introductionmentioning

confidence: 99%

A Data-Driven Noise Reduction Method and Its Application for the Enhancement of Stress Wave Signals

Feng

Fang

Xiang

et al. 2012

The Scientific World Journal

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Ensemble empirical mode decomposition (EEMD) has been recently used to recover a signal from observed noisy data. Typically this is performed by partial reconstruction or thresholding operation. In this paper we describe an efficient noise reduction method. EEMD is used to decompose a signal into several intrinsic mode functions (IMFs). The time intervals between two adjacent zero-crossings within the IMF, called instantaneous half period (IHP), are used as a criterion to detect and classify the noise oscillations. The undesirable waveforms with a larger IHP are set to zero. Furthermore, the optimum threshold in this approach can be derived from the signal itself using the consecutive mean square error (CMSE). The method is fully data driven, and it requires no prior knowledge of the target signals. This method can be verified with the simulative program by using Matlab. The denoising results are proper. In comparison with other EEMD based methods, it is concluded that the means adopted in this paper is suitable to preprocess the stress wave signals in the wood nondestructive testing.

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Improved measurement of dynamic modulation transfer functions on display using pursuit camera method based on wavelet-denoising method

Cited by 2 publications

References 11 publications

Measurement of binocular disparity in polarized based stereoscopic display by using digital camera

Measurement of binocular disparity in polarized based stereoscopic display by using digital camera

A Data-Driven Noise Reduction Method and Its Application for the Enhancement of Stress Wave Signals

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