Dr. Raja Bala Profile

Dr. Raja Bala

Principal Scientist at Amazon.com Inc

SPIE Involvement:

Author | Instructor

Publications (33)

SPIE Journal Paper | 17 December 2013 Open Access

Computer vision in roadway transportation systems: a survey

Robert Loce, Edgar Bernal, Wencheng Wu, Raja Bala

JEI, Vol. 22, Issue 04, 041121, (December 2013) https://doi.org/10.1117/12.10.1117/1.JEI.22.4.041121

KEYWORDS: Cameras, Computer vision technology, Machine vision, Roads, Imaging systems, Video, Computing systems, Surveillance, Sensors, Video surveillance

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 21 February 2012 Paper

Global image analysis to determine suitability for text-based image personalization

Hengzhou Ding, Raja Bala, Zhigang Fan, Charles Bouman, Jan Allebach

Proceedings Volume 8302, 83020S (2012) https://doi.org/10.1117/12.914251

KEYWORDS: Distance measurement, Image analysis, Algorithm development, Visualization, Image segmentation, 3D modeling, Fluctuations and noise, Human-machine interfaces, Image processing algorithms and systems, Image quality

Read Abstract +

Proceedings Article | 15 February 2012 Paper

Image simulation for automatic license plate recognition

Raja Bala, Yonghui Zhao, Aaron Burry, Vladimir Kozitsky, Claude Fillion, Craig Saunders, José Rodríguez-Serrano

Proceedings Volume 8305, 83050Z (2012) https://doi.org/10.1117/12.912453

KEYWORDS: Image processing, Optical character recognition, Image segmentation, Detection and tracking algorithms, Infrared imaging, RGB color model, Cameras, Infrared cameras, Optimization (mathematics), Image filtering

Read Abstract +

Proceedings Article | 10 February 2012 Paper

Text replacement on cylindrical surfaces: a semi-automatic approach

Hengzhou Ding, Raja Bala, Zhigang Fan, Charles Bouman, Jan Allebach

Proceedings Volume 8296, 82960X (2012) https://doi.org/10.1117/12.914247

KEYWORDS: 3D modeling, 3D image processing, Image segmentation, Lawrencium, Ear, Coded apertures, RGB color model, Lithium, Data modeling, Computer engineering

Read Abstract +

Proceedings Article | 7 February 2011 Paper

Language-based color editing for mobile device

Yonghui Zhao, Raja Bala, Karen Braun, Zahra Langford, Robert Rolleston, Michael Stevens

Proceedings Volume 7879, 787907 (2011) https://doi.org/10.1117/12.878885

KEYWORDS: Human-machine interfaces, Mobile devices, Haptic technology, Printing, Roads, Prototyping, Associative arrays, Colorimetry, Lead, Visualization

Read Abstract +

Proceedings Article | 7 February 2011 Paper

Personalized imaging: moving closer to reality

Hengzhou Ding, Raja Bala, Zhigang Fan, Charles Bouman, Jan Allebach

Proceedings Volume 7879, 787908 (2011) https://doi.org/10.1117/12.881740

KEYWORDS: Image segmentation, Edge detection, Detection and tracking algorithms, 3D modeling, 3D image processing, Image processing algorithms and systems, Image processing, Electronic imaging, Cameras, Sensors

Read Abstract +

Proceedings Article | 10 February 2010 Paper

Semi-automatic image personalization tool for variable text insertion and replacement

Hengzhou Ding, Raja Bala, Zhigang Fan, Reiner Eschbach, Charles Bouman, Jan Allebach

Proceedings Volume 7540, 75400N (2010) https://doi.org/10.1117/12.843729

KEYWORDS: Human-machine interfaces, Java, 3D image processing, Detection and tracking algorithms, Image display, Visualization, Graphic design, Databases, Algorithm development, 3D modeling

Read Abstract +

Proceedings Article | 6 February 2010 Paper

Semi-automatic object geometry estimation for image personalization

Hengzhou Ding, Raja Bala, Zhigang Fan, Reiner Eschbach, Charles Bouman, Jan Allebach

Proceedings Volume 7533, 753304 (2010) https://doi.org/10.1117/12.843828

KEYWORDS: 3D modeling, Image processing, Image segmentation, Coded apertures, Hough transforms, 3D image processing, Distance measurement, Visualization, Process modeling, Image filtering

Read Abstract +

Proceedings Article | 19 January 2010 Paper

The use of spatially based complexity measures toward color gamut mapping and image resizing

Vishal Monga, Raja Bala, Claude Fillion

Proceedings Volume 7528, 75280H (2010) https://doi.org/10.1117/12.843246

KEYWORDS: Image processing, Image filtering, Algorithm development, Color imaging, Printing, Optical filters, Image enhancement, Detection and tracking algorithms, Focus stacking software, Visualization

Read Abstract +

Proceedings Article | 19 January 2009 Paper

Creating variable data infrared signals for security applications

Reiner Eschbach, Raja Bala, Martin Maltz, Iris Zhao

Proceedings Volume 7241, 72411E (2009) https://doi.org/10.1117/12.811573

KEYWORDS: Infrared imaging, Infrared radiation, Information security, Computer security, Printing, Halftones, Visualization, Ultraviolet radiation, Carbon, Infrared cameras

Read Abstract +

Proceedings Article | 28 January 2008 Paper

Creating variable data UV signals for security applications

Reiner Eschbach, Raja Bala, Shen Wang

Proceedings Volume 6807, 68070K (2008) https://doi.org/10.1117/12.769000

KEYWORDS: Ultraviolet radiation, Luminescence, Computer security, Information security, Printing, Halftones, Fluorescent materials, Visible radiation, CMYK color model, Visualization

Read Abstract +

Proceedings Article | 28 January 2008 Paper

Spatial non-uniformity correction for color printer calibration

Shen-Ge Wang, Raja Bala, Wiley Wang

Proceedings Volume 6807, 68070Y (2008) https://doi.org/10.1117/12.767275

KEYWORDS: Calibration, Printing, Nonuniformity corrections, Control systems, Cesium, Error analysis, Color imaging, Imaging systems, Signal processing, Color management

Read Abstract +

SPIE Journal Paper | 1 January 2008

Channel-separable halftone independent methods for color drift correction

Vishal Monga, Shen-Ge Wang, Raja Bala

JEI, Vol. 17, Issue 01, 013003, (January 2008) https://doi.org/10.1117/12.10.1117/1.2898128

KEYWORDS: Printing, Halftones, Calibration, Binary data, CMYK color model, Scanners, RGB color model, Nonuniformity corrections, Reflectivity, Signal processing

Read Abstract +

SPIE Journal Paper | 1 October 2007

Scanner characterization for color measurement and diagnostics

Bong-Sun Lee, Raja Bala, Gaurav Sharma

JEI, Vol. 16, Issue 04, 043009, (October 2007) https://doi.org/10.1117/12.10.1117/1.2803833

KEYWORDS: Scanners, Printing, 3D scanning, CMYK color model, Diagnostics, RGB color model, Laser scanners, Calibration, 3D metrology, 3D acquisition

Read Abstract +

Proceedings Article | 29 January 2007 Paper

Halftone independent methods for color drift correction

Vishal Monga, Shen-ge Wang, Raja Bala

Proceedings Volume 6493, 649315 (2007) https://doi.org/10.1117/12.704556

KEYWORDS: Printing, Halftones, Calibration, CMYK color model, Binary data, Reflectivity, Solids, Signal processing, Light scattering, Scattering

Read Abstract +

Proceedings Article | 2 February 2006 Paper

Novel scanner characterization method for color measurement and diagnostics applications

Bong-Sun Lee, Raja Bala, Gaurav Sharma

Proceedings Volume 6065, 606512 (2006) https://doi.org/10.1117/12.658634

KEYWORDS: Scanners, Printing, RGB color model, CMYK color model, 3D acquisition, Calibration, Diagnostics, 3D printing, 3D imaging standards, Halftones

Read Abstract +

Proceedings Article | 17 January 2005 Paper

Challenges in color reproduction: toward higher dimensions

Raja Bala

Proceedings Volume 5667, (2005) https://doi.org/10.1117/12.597152

KEYWORDS: Color reproduction, RGB color model, Color management, Color imaging, Optical filters, CMYK color model, Imaging spectroscopy, Visualization, High dynamic range imaging, Linear filtering

Read Abstract +

Proceedings Article | 17 January 2005 Paper

Smooth blending of two inks of similar hue to simulate one ink

Mark Shaw, Raja Bala, Gaurav Sharma

Proceedings Volume 5667, (2005) https://doi.org/10.1117/12.601028

KEYWORDS: Printing, CMYK color model, Data conversion, Inkjet technology, Image quality, Color difference, Principal component analysis, Graphic arts, Composites, Reflectivity

Read Abstract +

SPIE Journal Paper | 1 January 2004

Simple spatial processing for color mappings

Reiner Eschbach, Raja Bala, Ricardo de Queiroz

JEI, Vol. 13, Issue 01, (January 2004) https://doi.org/10.1117/12.10.1117/1.1636184

KEYWORDS: Visual process modeling, Visual system, Visualization, Binary data, Halftones, Associative arrays, Image quality, Eye, Diffusion, Signal processing

Proceedings Article | 18 December 2003 Paper

Two-dimensional transforms for device color calibration

Raja Bala, Vishal Monga, Gaurav Sharma, Jean-Pierre Van de Capelle

Proceedings Volume 5293, (2003) https://doi.org/10.1117/12.539804

KEYWORDS: Calibration, Printing, CMYK color model, Control systems, Transform theory, Image processing, Color image processing, Color reproduction, 3D printing, Computer engineering

Read Abstract +

Proceedings Article | 18 December 2003 Paper

Color-to-grayscale conversion to maintain discriminability

Raja Bala, Karen Braun

Proceedings Volume 5293, (2003) https://doi.org/10.1117/12.532192

KEYWORDS: Visualization, Color difference, Printing, RGB color model, Raster graphics, Data modeling, Colorimetry, Associative arrays, LCDs, Color reproduction

Read Abstract +

Proceedings Article | 1 July 2003 Paper

Inverse problems in color device characterization

Raja Bala

Proceedings Volume 5016, (2003) https://doi.org/10.1117/12.488617

KEYWORDS: CMYK color model, Printing, Calibration, Inverse problems, Model-based design, 3D modeling, Scanners, Halftones, RGB color model, Instrument modeling

Read Abstract +

Proceedings Article | 28 December 2001 Paper

Picture/graphics classification using texture features

Zhigang Fan, Raja Bala

Proceedings Volume 4663, (2001) https://doi.org/10.1117/12.452977

KEYWORDS: Visualization, Image processing, Image classification, Halftones, Image compression, Digital imaging, Image visualization, Image segmentation, Linear filtering, Image analysis

Read Abstract +

Proceedings Article | 28 December 2001 Paper

Determining the source of unknown CMYK images

Raja Bala

Proceedings Volume 4663, (2001) https://doi.org/10.1117/12.452983

KEYWORDS: CMYK color model, Printing, Image classification, Solids, Image analysis, Feature extraction, Digital imaging, Color management, Xerography, Fuzzy logic

Read Abstract +

SPIE Journal Paper | 1 April 1999

Optimization of the spectral Neugebauer model for printer characterization

Raja Balasubramanian

JEI, Vol. 8, Issue 02, (April 1999) https://doi.org/10.1117/12.10.1117/1.482694

KEYWORDS: Printing, CMYK color model, Reflectivity, Halftones, RGB color model, Light scattering, Data modeling, Optimization (mathematics), Spectral models, Mathematical modeling

Proceedings Article | 2 January 1998 Paper

Multiresolution color correction

Raja Balasubramanian, Ricardo de Queiroz, Zhigang Fan

Proceedings Volume 3300, (1998) https://doi.org/10.1117/12.298277

KEYWORDS: Image processing, Printing, CMYK color model, Image resolution, Wavelet transforms, Wavelets, Image quality, Image compression, Spatial frequencies, Discrete wavelet transforms

Read Abstract +

Proceedings Article | 4 April 1997 Paper

Method for quantifying the color gamut of an output device

Raja Balasubramanian, Edul Dalal

Proceedings Volume 3018, (1997) https://doi.org/10.1117/12.271580

KEYWORDS: Printing, Solids, Data modeling, Statistical analysis, CMYK color model, Phase modulation, Visualization, Instrument modeling, Aluminium phosphide, Statistical modeling

Read Abstract +

Proceedings Article | 29 March 1996 Paper

Refinement of printer transformations using weighted regression

Raja Balasubramanian, Martin Maltz

Proceedings Volume 2658, (1996) https://doi.org/10.1117/12.236984

KEYWORDS: CMYK color model, Printing, Transform theory, Data modeling, Systems modeling, 3D modeling, Error analysis, Spectral models, Statistical modeling, Visualization

Read Abstract +

Proceedings Article | 27 April 1995 Paper

Printer model for dot-on-dot halftone screens

Raja Balasubramanian

Proceedings Volume 2413, (1995) https://doi.org/10.1117/12.207594

KEYWORDS: CMYK color model, Printing, Reflectivity, Halftones, Data modeling, Mathematical modeling, Light scattering, Scattering, Solids, Calibration

Read Abstract +

SPIE Journal Paper | 1 January 1994

Sequential scalar quantization of color images

Raja Balasubramanian, Charles Bouman, Jan Allebach

JEI, Vol. 3, Issue 01, (January 1994) https://doi.org/10.1117/12.10.1117/12.165065

KEYWORDS: Quantization, Image quality, RGB color model, Visualization, Binary data, Distortion, Computer programming, Electronic imaging, Visual system, Image enhancement

Read Abstract +

Proceedings Article | 8 September 1993 Paper

Model-based color image quantization

Thomas Flohr, Bernd Kolpatzik, Raja Balasubramanian, David Carrara, Charles Bouman, Jan Allebach

Proceedings Volume 1913, (1993) https://doi.org/10.1117/12.152701

KEYWORDS: RGB color model, Halftones, Spatial frequencies, Visual process modeling, Visualization, Diffusion, Contrast sensitivity, Data modeling, Eye models, Point spread functions

Read Abstract +

Proceedings Article | 19 May 1992 Paper

New results in color image quantization

Raja Balasubramanian, Charles Bouman, Jan Allebach

Proceedings Volume 1657, (1992) https://doi.org/10.1117/12.58336

KEYWORDS: Binary data, Quantization, Image processing, Image quality, Visualization, Data storage, Image storage, Composites, RGB color model, Video

Read Abstract +

Proceedings Article | 1 June 1991 Paper

New approach to palette selection for color images

Raja Balasubramanian, Jan Allebach

Proceedings Volume 1453, (1991) https://doi.org/10.1117/12.44345

KEYWORDS: Quantization, Visualization, Image quality, Human vision and color perception, Binary data, RGB color model, Image processing, Visual system, Image resolution, Composites

Read Abstract +

Showing 5 of 33 publications

Conference Committee Involvement (4)

Video Surveillance and Transportation Imaging Applications 2015

10 February 2015 | San Francisco, California, United States

Video Surveillance and Transportation Imaging Applications 2014

3 February 2014 | San Francisco, California, United States

Video Surveillance and Transportation Imaging Applications

4 February 2013 | Burlingame, California, United States

Mobile Computational Photography

4 February 2013 | Burlingame, California, United States

Course Instructor

SC1131: Computer Vision and Imaging in Transportation Applications

This course introduces the attendee to applications in the transportation industry that employ imaging, computer vision, and video processing technologies. The class begins with a survey of key topics in transportation falling under three broad categories: safety, efficiency, and security. Topics include driver assistance, traffic surveillance and law enforcement, video-based tolling, monitoring vehicles of interest, and incident detection. The second part of the course provides a more in-depth treatment of state-of-art approaches to selected problems such as vehicle license plate recognition, vehicle occupancy estimation, speed enforcement, driver attention monitoring, and sensing of road and environmental conditions. Where necessary, background material on relevant computer vision concepts will be covered, such as image segmentation, object detection, classification, recognition, and tracking, and 3D camera geometry.

Expand Description +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years