The Experts below are selected from a list of 63 Experts worldwide ranked by ideXlab platform
Takeshi Furukawa - One of the best experts on this subject based on the ideXlab platform.
-
ICDAR - A New Method for Discriminating Printers Based on Contours Qualities of Printed Characters Using Wavelet Decomposition
2013 12th International Conference on Document Analysis and Recognition, 2013Co-Authors: Takeshi FurukawaAbstract:This article described a new method for discriminating models of laser printers by means of their printed characters, in particular details in contours of characters. A method we proposed was based on evaluating qualities in contours of printed characters using wavelet decomposition. Recently most of characters printed by laser printers were originally stored in printers or computers as vector outline such as Bezier or Spline. Raster Image Processor (RIP) implemented as hardware or software in printers or computers Rasterized the outline into a pattern which was composed of subtle vast dots. There was a variety of types in contours of printed characters which were printed by each printer model. In Japan, stalkers typed their threatening letters using common used fonts such as MS Mincho in Japanese and Times or Century in English. Even though the kinds of fonts were known, there was not evidence since these fonts were equipped in almost all computers in Japan. Therefore a new method to discriminate models of printers was desired. Even though same too common fonts were used in threatening letters, subtle differences among contours of printed characters were observed since there was a variety of methods which each maker adopted in rendering and screening which converted from outline to pattern of dots. In order to detect the subtle differences among contours of printed documents, the article utilized wavelet decomposition and a high resolution i.e., 5400dpi flat bed Image scanner. The article also used a simple method to analyze results of wavelet decomposition which was counting numbers of zero-crossing points at each scale of decomposition. The results of the experiment showed that the method we proposed was able to detect differences among models of laser printers even though using same too common fonts both Japanese and English.
-
A New Method for Discriminating Printers Based on Contours Qualities of Printed Characters Using Wavelet Decomposition
2013 12th International Conference on Document Analysis and Recognition, 2013Co-Authors: Takeshi FurukawaAbstract:This article described a new method for discriminating models of laser printers by means of their printed characters, in particular details in contours of characters. A method we proposed was based on evaluating qualities in contours of printed characters using wavelet decomposition. Recently most of characters printed by laser printers were originally stored in printers or computers as vector outline such as Bezier or Spline. Raster Image Processor (RIP) implemented as hardware or software in printers or computers Rasterized the outline into a pattern which was composed of subtle vast dots. There was a variety of types in contours of printed characters which were printed by each printer model. In Japan, stalkers typed their threatening letters using common used fonts such as MS Mincho in Japanese and Times or Century in English. Even though the kinds of fonts were known, there was not evidence since these fonts were equipped in almost all computers in Japan. Therefore a new method to discriminate models of printers was desired. Even though same too common fonts were used in threatening letters, subtle differences among contours of printed characters were observed since there was a variety of methods which each maker adopted in rendering and screening which converted from outline to pattern of dots. In order to detect the subtle differences among contours of printed documents, the article utilized wavelet decomposition and a high resolution i.e., 5400dpi flat bed Image scanner. The article also used a simple method to analyze results of wavelet decomposition which was counting numbers of zero-crossing points at each scale of decomposition. The results of the experiment showed that the method we proposed was able to detect differences among models of laser printers even though using same too common fonts both Japanese and English.
Jan Van Campenhout - One of the best experts on this subject based on the ideXlab platform.
-
Parallel Raster Image Processor for PCB manufacturing
Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics, 1994Co-Authors: J.l. Martin, Roeland Lasure, G. Aranguren, J. Ezquerra, P. Ibanez, Jan Van CampenhoutAbstract:The printed circuit board (PCB) is the base most commonly used for building electronic circuits. The design of the PCB is usually done by means of an adequate CAD program. The files generated by CAD programs can have different formats to describe printed circuit boards, but all formats essentially consist of the traces and the soldering pads that make up a PCB. The present paper describes a Raster Image processing system based on a parallel architecture aimed at the conversion of CAD files for making printed circuits using the "direct imaging" technique, by means of a multiple laser beam plotter.
-
Parallel Image generation for fast laser recording
Recording Systems: High-Resolution Cameras and Recording Devices and Laser Scanning and Recording Systems, 1993Co-Authors: Roeland Lasure, Jan Van CampenhoutAbstract:We have developed a parallel Raster Image Processor that generates the laser beam control information on-the-fly, obviating the need for Image storage, and in real-time. The system exhibits a nearly linear speedup in the number of Processors used: It is therefore possible to achieve the very high pixel rates requested by the laser recorder. The system is composed of a variable number of Processors and can hence be scaled, depending on the speed of the laser recorder. The software architecture of the system allows transparent execution of a large class of sequential algorithms on the parallel hardware.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
-
prip a parallel Raster Image Processor
Computer Graphics Forum, 1993Co-Authors: Jan Van Campenhout, Roeland LasureAbstract:Like colour video displays and laser printers, laser photoplotters are Raster scan devices. For such devices, the pixel stream representing the Image must be generated in real time, and in the (scan line) order required. However, the typical size of the Images photoplotters produce is an order of magnitude higher than that of video displays and laser printers, precluding the use of full-size bitmap memories. These requirements pose particular implementation problems for the Raster Image Processor generating the pixel stream. The parallel RIP system presented here is aimed at high-resolution laser photoplotters, and features a largely scalable performance ranging from 40 to several hundred megapixels per second. It is built with standard components such as graphics microProcessors and VRAM memories. Its architecture is that of a distributed memory multiProcessor system with a global ring-like topology. And most importantly, it can be programmed using the traditional sequential programming paradigm. Only minor additions are needed to sequential graphical algorithms to be executable on the system with an arbitrary number of Processors. A prototype 8-Processor PRIP system has been built and tested generating printed circuit board Images for a direct imaging photoplotter. The prototype exhibits a near-linear speedup with respect to a monoProcessor solution. Architectural simulations indicate that the system can be expanded to well over 10 Processors.
Giordano B Beretta - One of the best experts on this subject based on the ideXlab platform.
-
font rendering on a gpu based Raster Image Processor
Proceedings of SPIE, 2010Co-Authors: John Recker, Giordano B BerettaAbstract:Historically, in the 35 years of digital printing research, Raster Image processing has always lagged behind marking engine technology, i.e., we have never been able to deliver rendered digital pages as fast as digital print engines can consume them. This trend has resulted in products based on throttled digital printers or expensive Raster Image Processors (RIP) with hardware acceleration. The current trend in computer software architecture is to leverage graphic processing units (GPU) for computing tasks whenever appropriate. We discuss the issues for rendering fonts on such an architecture and present an implementation.
-
Color Imaging: Displaying, Processing, Hardcopy, and Applications - Font rendering on a GPU-based Raster Image Processor
Proceedings of SPIE, 2010Co-Authors: John Recker, Giordano B BerettaAbstract:Historically, in the 35 years of digital printing research, Raster Image processing has always lagged behind marking engine technology, i.e., we have never been able to deliver rendered digital pages as fast as digital print engines can consume them. This trend has resulted in products based on throttled digital printers or expensive Raster Image Processors (RIP) with hardware acceleration. The current trend in computer software architecture is to leverage graphic processing units (GPU) for computing tasks whenever appropriate. We discuss the issues for rendering fonts on such an architecture and present an implementation.
Roeland Lasure - One of the best experts on this subject based on the ideXlab platform.
-
Parallel Raster Image Processor for PCB manufacturing
Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics, 1994Co-Authors: J.l. Martin, Roeland Lasure, G. Aranguren, J. Ezquerra, P. Ibanez, Jan Van CampenhoutAbstract:The printed circuit board (PCB) is the base most commonly used for building electronic circuits. The design of the PCB is usually done by means of an adequate CAD program. The files generated by CAD programs can have different formats to describe printed circuit boards, but all formats essentially consist of the traces and the soldering pads that make up a PCB. The present paper describes a Raster Image processing system based on a parallel architecture aimed at the conversion of CAD files for making printed circuits using the "direct imaging" technique, by means of a multiple laser beam plotter.
-
Parallel Image generation for fast laser recording
Recording Systems: High-Resolution Cameras and Recording Devices and Laser Scanning and Recording Systems, 1993Co-Authors: Roeland Lasure, Jan Van CampenhoutAbstract:We have developed a parallel Raster Image Processor that generates the laser beam control information on-the-fly, obviating the need for Image storage, and in real-time. The system exhibits a nearly linear speedup in the number of Processors used: It is therefore possible to achieve the very high pixel rates requested by the laser recorder. The system is composed of a variable number of Processors and can hence be scaled, depending on the speed of the laser recorder. The software architecture of the system allows transparent execution of a large class of sequential algorithms on the parallel hardware.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
-
prip a parallel Raster Image Processor
Computer Graphics Forum, 1993Co-Authors: Jan Van Campenhout, Roeland LasureAbstract:Like colour video displays and laser printers, laser photoplotters are Raster scan devices. For such devices, the pixel stream representing the Image must be generated in real time, and in the (scan line) order required. However, the typical size of the Images photoplotters produce is an order of magnitude higher than that of video displays and laser printers, precluding the use of full-size bitmap memories. These requirements pose particular implementation problems for the Raster Image Processor generating the pixel stream. The parallel RIP system presented here is aimed at high-resolution laser photoplotters, and features a largely scalable performance ranging from 40 to several hundred megapixels per second. It is built with standard components such as graphics microProcessors and VRAM memories. Its architecture is that of a distributed memory multiProcessor system with a global ring-like topology. And most importantly, it can be programmed using the traditional sequential programming paradigm. Only minor additions are needed to sequential graphical algorithms to be executable on the system with an arbitrary number of Processors. A prototype 8-Processor PRIP system has been built and tested generating printed circuit board Images for a direct imaging photoplotter. The prototype exhibits a near-linear speedup with respect to a monoProcessor solution. Architectural simulations indicate that the system can be expanded to well over 10 Processors.
John Recker - One of the best experts on this subject based on the ideXlab platform.
-
font rendering on a gpu based Raster Image Processor
Proceedings of SPIE, 2010Co-Authors: John Recker, Giordano B BerettaAbstract:Historically, in the 35 years of digital printing research, Raster Image processing has always lagged behind marking engine technology, i.e., we have never been able to deliver rendered digital pages as fast as digital print engines can consume them. This trend has resulted in products based on throttled digital printers or expensive Raster Image Processors (RIP) with hardware acceleration. The current trend in computer software architecture is to leverage graphic processing units (GPU) for computing tasks whenever appropriate. We discuss the issues for rendering fonts on such an architecture and present an implementation.
-
Color Imaging: Displaying, Processing, Hardcopy, and Applications - Font rendering on a GPU-based Raster Image Processor
Proceedings of SPIE, 2010Co-Authors: John Recker, Giordano B BerettaAbstract:Historically, in the 35 years of digital printing research, Raster Image processing has always lagged behind marking engine technology, i.e., we have never been able to deliver rendered digital pages as fast as digital print engines can consume them. This trend has resulted in products based on throttled digital printers or expensive Raster Image Processors (RIP) with hardware acceleration. The current trend in computer software architecture is to leverage graphic processing units (GPU) for computing tasks whenever appropriate. We discuss the issues for rendering fonts on such an architecture and present an implementation.
