Patent
Edge adaptive image expansion and enhancement system and method
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TLDR
In this paper, the edge in the input image is detected based on local (125) and average (127) signal variances in the inputs, and according to the edge detection parameters, including orientation, anisotropy and variance strength, the method determines a footprint and frequency response for the interpolation of the output pixel.Abstract:
An edge adaptive system and method for image filtering. The method maps each output pixel onto input image coordinates (110) and then prefilters and resamples the input image pixels around this point to reduce noise and adjust the scale corresponding to a particular operation. Then the edge in the input image is detected based on local (125) and average (127) signal variances in the input pixels. According to the edge detection parameters (129), including orientation, anisotropy and variance strength, the method determines a footprint and frequency response for the interpolation of the output pixel. In a more particular implementation, the method divides the input pixel space into a finite number of directions called skews, and estimates the edge orientation with the nearest skew direction. This further facilitates pixel inclusion in the interpolation of the output pixel.read more
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References
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Journal ArticleDOI
New edge-directed interpolation
Xin Li,Michael T. Orchard +1 more
TL;DR: Simulation results demonstrate that the new interpolation algorithm substantially improves the subjective quality of the interpolated images over conventional linear interpolation.
Journal ArticleDOI
Nonlinear image filtering with edge and corner enhancement
Mark J. Nitzberg,T. Shiota +1 more
TL;DR: In this paper, the authors describe a model of nonlinear image filtering for noise reduction and edge enhancement using anisotropic diffusion, which roughly corresponds to a nonlinear diffusion process with backward heat flow across the strong edges.
Patent
Noise reduction system
TL;DR: In this article, a steerable pyramid architecture is used for image enhancement for the first time, with the steering being provided by the above orientation tuned filters, which is a set of orientation-tuned filters of a specialized design to permit steering, with analysis and synthesis filters also having a self-inverting characteristic.
Proceedings ArticleDOI
Edge preserving orientation adaptive filtering
TL;DR: This paper describes a new stragegy for combining orientation adaptive filtering and edge preserving filtering that adapts to the local orientation and avoids filtering across borders and found that the filter strategy has a lower complexity and yields a constant improvement of the SNR.
Patent
Perceptual modeling of media signals based on local contrast and directional edges
TL;DR: In this paper, a perceptual model was proposed to reduce the perceptibility of changes made to code the signal. But the model only considers the local contrast of the image and the directional control vector to create a gain vector.