Dr. Takashi Komatsu Profile

Dr. Takashi Komatsu

Assistant Professor at Kanagawa Univ

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Author

Publications (33)

Proceedings Article | 19 January 2010 Paper

Hard color-shrinkage for color-image processing of a digital color camera

Takahiro Saito, Yasutaka Ueda, Nobuhiro Fujii, Takashi Komatsu

Proceedings Volume 7537, 75370Q (2010) https://doi.org/10.1117/12.838564

KEYWORDS: Interference (communication), Denoising, Wavelets, Digital cameras, Cameras, Wavelet transforms, Optimization (mathematics), Associative arrays, RGB color model, Statistical analysis

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Proceedings Article | 19 January 2010 Paper

Restoration of a high ISO-sensitivity color image with the shift-invariant Haar wavelet transform

Takahiro Saito, Daisuke Yamada, Takashi Komatsu

Proceedings Volume 7537, 75370A (2010) https://doi.org/10.1117/12.838562

KEYWORDS: Wavelet transforms, Wavelets, Image processing, Denoising, Digital cameras, Cameras, Linear filtering, Image restoration, Crystals, Optical filters

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Proceedings Article | 19 January 2009 Paper

Nonlinear color-image decomposition for image processing of a digital color camera

Takahiro Saito, Haruya Aizawa, Daisuke Yamada, Takashi Komatsu

Proceedings Volume 7250, 72500R (2009) https://doi.org/10.1117/12.805231

KEYWORDS: Wavelet transforms, Denoising, Image processing, Wavelets, Digital cameras, Cameras, Nonlinear image processing, RGB color model, Information technology, Projection systems

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Proceedings Article | 19 January 2009 Paper

New architectures of an image-processing pipeline based on nonlinear image decomposition

Takahiro Saito, Daisuke Yamada, Haruya Aizawa, Takashi Komatsu

Proceedings Volume 7250, 72500A (2009) https://doi.org/10.1117/12.805230

KEYWORDS: Image processing, Image enhancement, Digital cameras, Cameras, Image restoration, Super resolution, Visibility, Signal processing, Digital imaging, Digital image processing

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Proceedings Article | 3 March 2008 Paper

Noise suppression approach with the BV-L1 nonlinear image decomposition

Takahiro Saito, Yuki Ishii, Haruya Aizawa, Takashi Komatsu

Proceedings Volume 6817, 681709 (2008) https://doi.org/10.1117/12.761112

KEYWORDS: Denoising, Interference (communication), Digital cameras, Optical filters, Cameras, Image filtering, Digital imaging, Wavelets, Nonlinear optics, Digital filtering

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Proceedings Article | 3 March 2008 Paper

High-quality image interpolation via nonlinear image decomposition

Takahiro Saito, Yuki Ishii, Haruya Aizawa, Takashi Komatsu

Proceedings Volume 6812, 68120V (2008) https://doi.org/10.1117/12.761059

KEYWORDS: Super resolution, Diffusion, Image interpolation, Image quality, Signal to noise ratio, Linear filtering, Visualization, Iterative methods, Spatial frequencies, Reconstruction algorithms

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Proceedings Article | 3 March 2008 Paper

Demosaicing method using the extended color total-variation regularization

Takahiro Saito, Takashi Komatsu

Proceedings Volume 6817, 68170C (2008) https://doi.org/10.1117/12.761093

KEYWORDS: Super resolution, Color difference, Image processing, Interference (communication), RGB color model, Linear filtering, Optical filters, Image restoration, Cameras, Digital cameras

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Proceedings Article | 13 June 2007 Paper

Nonlinear decomposition-and-denoising approach for removal of signal-dependent noise of a digital color camera

Takahiro Saito, Yuki Ishii, Takashi Komatsu

Proceedings Volume 6603, 66031M (2007) https://doi.org/10.1117/12.724534

KEYWORDS: Interference (communication), Denoising, Digital cameras, Nonlinear optics, Signal to noise ratio, Visualization, Cameras, Digital imaging, Astatine, Image processing

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Proceedings Article | 27 February 2007 Paper

Motion deblurring for suppression of breathing distortions caused by camera shake

Ikuko Tsubaki, Takashi Komatsu, Takahiro Saito

Proceedings Volume 6497, 649714 (2007) https://doi.org/10.1117/12.711066

KEYWORDS: Video, Cameras, Point spread functions, Motion estimation, Field emission displays, Deconvolution, Bromine, Image restoration, Data modeling, Video processing

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Proceedings Article | 20 February 2007 Paper

Super-resolution total-variation decoding of JPEG-compressed image data

Takahiro Saito, Takashi Komatsu

Proceedings Volume 6502, 65020G (2007) https://doi.org/10.1117/12.702977

KEYWORDS: Image restoration, Super resolution, Image compression, Radio over Fiber, Quantization, Cameras, Computer programming, Digital imaging, Signal to noise ratio, Interference (communication)

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Proceedings Article | 20 February 2007 Paper

CMOS color image sensor with overlaid organic photoconductive layers having narrow absorption band

Shunji Takada, Mikio Ihama, Masafumi Inuiya, Takashi Komatsu, Takahiro Saito

Proceedings Volume 6502, 650207 (2007) https://doi.org/10.1117/12.704788

KEYWORDS: Image sensors, Absorption, Optical filters, CMOS sensors, Color reproduction, Color difference, Electrodes, Image filtering, RGB color model, Filtering (signal processing)

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Proceedings Article | 20 February 2007 Paper

Removal of signal-dependent noise for a digital camera

Takahiro Saito, Yuki Ishii, Reina Nosaka, Takashi Komatsu

Proceedings Volume 6502, 65020E (2007) https://doi.org/10.1117/12.702980

KEYWORDS: Interference (communication), Denoising, Digital cameras, Nonlinear optics, Visualization, Digital imaging, Radio over Fiber, Sensors, Image visualization, Optical filters

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Proceedings Article | 10 February 2006 Paper

Image recovery for a direct color imaging approach using a color filter array

Takahiro Saito, Takashi Komatsu

Proceedings Volume 6069, 606905 (2006) https://doi.org/10.1117/12.641328

KEYWORDS: Optical filters, RGB color model, Sensors, Spatial resolution, Transmittance, Color reproduction, Image sensors, Inverse problems, Image transmission, Image restoration

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Proceedings Article | 2 February 2006 Paper

Spatially adaptive super-resolution sharpening-demosaicking for a single solid-state color image sensor

Takahiro Saito, Takashi Komatsu

Proceedings Volume 6069, 606908 (2006) https://doi.org/10.1117/12.641325

KEYWORDS: Super resolution, Image restoration, Image processing, Optical filters, RGB color model, Linear filtering, Adaptive control, Cameras, Digital imaging, Image filtering

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Proceedings Article | 2 February 2006 Paper

Separation of irradiance and reflectance from observed color images by logarithmical nonlinear diffusion process

Takahiro Saito, Hiromi Takahashi, Takashi Komatsu

Proceedings Volume 6065, 606511 (2006) https://doi.org/10.1117/12.641329

KEYWORDS: Reflectivity, Diffusion, Image quality, Composites, Image processing, Algorithm development, RGB color model, Color image processing, Digital cameras, Magnetic resonance imaging

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Proceedings Article | 19 January 2006 Paper

Coupled nonlinear-diffusion color image sharpening based on the chromaticity-brightness model

Takahiro Saito, Reina Nosaka, Takashi Komatsu

Proceedings Volume 6077, 60771H (2006) https://doi.org/10.1117/12.641330

KEYWORDS: 3D modeling, RGB color model, Diffusion, Image processing, Bromine, Argon, Image contrast enhancement, Image enhancement, Human vision and color perception, Image filtering

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Proceedings Article | 24 June 2005 Paper

Model-based PDE method and model-free PDE method for motion de-blurring

Takahiro Saito, Hiroyuki Harada, Takashi Komatsu

Proceedings Volume 5960, 59605A (2005) https://doi.org/10.1117/12.633209

KEYWORDS: Motion models, Model-based design, Motion estimation, Data modeling, Diffusion, Image restoration, Error analysis, Motion measurement, Performance modeling, Algorithm development

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Proceedings Article | 14 March 2005 Paper

Motion deblurring by coupled nonlinear diffusion with discrete calculus adaptive to a motion direction

Takahiro Saito, Hiroyuki Harada, Takashi Komatsu

Proceedings Volume 5685, (2005) https://doi.org/10.1117/12.585208

KEYWORDS: Diffusion, Calculus, Image processing, Motion estimation, Image filtering, Nonlinear filtering, Visibility, Image restoration, Reliability, Image analysis

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Proceedings Article | 23 February 2005 Paper

Sharpening-demosaicking method with a total-variation-based superresolution technique

Takahiro Saito, Takashi Komatsu

Proceedings Volume 5678, (2005) https://doi.org/10.1117/12.585204

KEYWORDS: Optical filters, RGB color model, Linear filtering, Image processing, Super resolution, Spatial frequencies, Fourier transforms, Image filtering, Crystals, Color reproduction

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Proceedings Article | 23 February 2005 Paper

Variational color transformation method for direct color imaging

Takahiro Saito, Takashi Komatsu

Proceedings Volume 5678, (2005) https://doi.org/10.1117/12.585199

KEYWORDS: Reflectivity, Sensors, Inverse problems, RGB color model, Optical filters, Image sensors, Data acquisition, Silicon, Color imaging, Solid state electronics

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Proceedings Article | 7 June 2004 Paper

Demosaicking for a color image sensor with removal of blur due to an optical low-pass filter

Takashi Komatsu, Takahiro Saito

Proceedings Volume 5301, (2004) https://doi.org/10.1117/12.526479

KEYWORDS: Optical filters, RGB color model, Linear filtering, Image processing, Crystals, Color reproduction, Solid state electronics, Inverse optics, Color image segmentation, Image filtering

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Proceedings Article | 18 January 2004 Paper

Motion deblurring based on time-evolution of simultaneous nonlinear reaction-diffusion

Takahiro Saito, Hiroyuki Harada, Takashi Komatsu

Proceedings Volume 5308, (2004) https://doi.org/10.1117/12.524716

KEYWORDS: Diffusion, Image processing, Motion estimation, Image filtering, Image restoration, Image enhancement, Nonlinear filtering, Bromine, Nonlinear image processing, Model-based design

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Proceedings Article | 23 June 2003 Paper

Color image sharpening based on collective time-evolution of simultaneous nonlinear reaction-diffusion

Takahiro Saito, Jun Satsumabayashi, Hiroyuki Harada, Takashi Komatsu

Proceedings Volume 5150, (2003) https://doi.org/10.1117/12.501482

KEYWORDS: RGB color model, Diffusion, Bromine, Image enhancement, Argon, Visibility, Image processing, Nonlinear control, Nonlinear image processing, Color image processing

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Proceedings Article | 23 June 2003 Paper

Detection and repair of defects in range-and-color image data observed with a laser range scanner

Takahiro Saito, Takashi Komatsu, Shin-ichi Sunaga, Masayuki Hashiguchi

Proceedings Volume 5150, (2003) https://doi.org/10.1117/12.501480

KEYWORDS: Image segmentation, Buildings, Data conversion, Laser range finders, 3D image processing, Defect detection, Algorithm development, Detection and tracking algorithms, 3D acquisition, Image processing algorithms and systems

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Proceedings Article | 28 May 2003 Paper

Method for repair of defects in range data observed with a laser range scanner

Takahiro Saito, Takashi Komatsu, Shin-ichi Sunaga

Proceedings Volume 5014, (2003) https://doi.org/10.1117/12.477709

KEYWORDS: Image segmentation, Buildings, 3D image processing, Data conversion, Defect detection, Laser range finders, Data acquisition, 3D acquisition, Image processing algorithms and systems, Detection and tracking algorithms

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Proceedings Article | 16 May 2003 Paper

Color image acquisition method using color filter arrays occupying overlapped color spaces

Takashi Komatsu, Takahiro Saito

Proceedings Volume 5017, (2003) https://doi.org/10.1117/12.476743

KEYWORDS: Optical filters, RGB color model, Image filtering, Image restoration, Linear filtering, Spatial resolution, Sensors, Solid state electronics, Color image segmentation, Image enhancement

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Proceedings Article | 21 November 2002 Paper

Landweber-type iterative demosaicing for a single solid state color image sensor

Takashi Komatsu, Takahiro Saito

Proceedings Volume 4790, (2002) https://doi.org/10.1117/12.452208

KEYWORDS: Optical filters, Image sensors, Solid state electronics, Image restoration, Image filtering, Cameras, Linear filtering, Color image segmentation, Image acquisition, Digital cameras

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Proceedings Article | 8 March 2002 Paper

Production of 3D consistent image representation of outdoor scenery for multimedia ambiance communication from multiviewpoint range data measured with a 3D laser scanner

Takahiro Saito, Hiroshi Imamura, Shin-ichi Sunaga, Takashi Komatsu

Proceedings Volume 4661, (2002) https://doi.org/10.1117/12.460182

KEYWORDS: Image segmentation, 3D image processing, Laser scanners, 3D scanning, Image registration, 3D modeling, 3D metrology, Multimedia, Buildings, Data conversion

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Proceedings Article | 4 January 2002 Paper

Selective sharpness enhancement of corrupted old film sequences by coupled nonlinear reaction-diffusion time-evolution

Takahiro Saito, Kentarou Yashiro, Jun Satsumabayashi, Takashi Komatsu

Proceedings Volume 4671, (2002) https://doi.org/10.1117/12.453130

KEYWORDS: Image enhancement, Visibility, Digital filtering, Diffusion, Adaptive control, Image processing, Image segmentation, Anisotropic filtering, Image restoration, Image filtering

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Proceedings Article | 30 May 2000 Paper

Interframe robust image processing for restoration of heavily corrupted old movies

Takahiro Saito, Takashi Komatsu, Toshiaki Ohuchi, Takamasa Seto

Proceedings Volume 4067, (2000) https://doi.org/10.1117/12.386626

KEYWORDS: Image processing, Cameras, Video, Digital filtering, Anisotropic filtering, Algorithm development, Scanners, Motion estimation, Digital imaging, Curium

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Proceedings Article | 1 November 1991 Paper

Acquisition of very high resolution images using stereo cameras

Kiyoharu Aizawa, Takashi Komatsu, Takahiro Saito

Proceedings Volume 1605, (1991) https://doi.org/10.1117/12.50221

KEYWORDS: Visual communications, Image resolution, Image processing, Imaging systems, Ions, Visualization, Stereoscopic cameras, Signal to noise ratio, Signal processing, Image visualization

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Proceedings Article | 1 November 1991 Paper

High-fidelity subband coding for superhigh-resolution images

Takahiro Saito, Hirofumi Higuchi, Takashi Komatsu

Proceedings Volume 1605, (1991) https://doi.org/10.1117/12.50287

KEYWORDS: Quantization, Image resolution, Super resolution, Image compression, Visual communications, Interference (communication), Spatial resolution, Distortion, Computer programming, Image processing

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Super high resolution images with more than 2,000*2.000 pixels will play a very important role in a wide variety of applications of future multimedia communications ranging from electronic publishing to broadcasting. To make communication of super high resolution images practicable, we need to develop image coding techniques that can compress super high resolution images by a factor of 1/10 to 1/20. Among existing image coding techniques, the sub-band coding technique is one of the most suitable techniques. With its applications to high-fidelity compression of super high resolution images,one of the major problem is how to encode high frequency sub-band signals. High frequency sub-band signals are well modeled as having approximately memoryless probability distribution, and hence the best way to solve this problem is to improve the quantization of high frequency sub-band signals. From the standpoint stated above, the work herein First compares three diferent scalor quantization schemes and improved permutation codes, which the authors have previously developed extending the concept of permutation codes, from the aspect of quantization performance for a memoryless probability distribution that well approximates the real statistical properties of high frequency sub-band signals, and thus demonstrates that at low coding rates improved permutation codes outperform the other scalor quatization schemes and that its superiority decreases as its coding rate increases. Moreover, from the results stated above, the work herein, develops rate-adaptive quantization techniques where the number of bits assigned to each subblock is determined according to the signal variance within the subblock and the proper quantization scheme is chosen from among different types of quantizaton schemes according to the allocated number of bits, and applies them to the high-fidelity encoding of high frequency sub-band signals of super high resolution images to demonstrate their usefulness.

Proceedings Article | 1 September 1990 Paper

Some variants of universal pattern-matching interframe coding

Takahiro Saito, Ryuji Abe, Takashi Komatsu, Hiroshi Harashima

Proceedings Volume 1360, (1990) https://doi.org/10.1117/12.24234

KEYWORDS: Image compression, Visual communications, Image processing, Image segmentation, Video compression, Computer simulations, Computer programming, Cameras, Image enhancement, Signal processing

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Showing 5 of 33 publications

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