Often documents of historic significance are discovered in a state of disrepair. Such documents are commonly scanned to simultaneously archive and publicize a discovery. Converting the information found within such documents to public knowledge occurs more quickly and cheaply if an automatic method to enhance these degraded documents is used instead of enhancing each document image by hand. We describe a novel automated image enhancement approach that requires no training data. The approach is applicable to images of typewritten text as well as hand written text or a mixture of both. The pair of parameters used by the approach is automatically self-tuned according to the input image. The processing of a set of historic documents stored at Yad Vashem Holocaust Memorial Museum in Israel and selected images from the 2011 DIBCO test collection illustrate the approach.

Document enhancement tools are a valuable help in the study of historic documents. Given proper filter settings, many effects that impair the legibility can be evened out (e.g. washed out ink, stained and yellowed paper). However, because of differing authors, languages, handwritings, fonts and paper conditions, no single filter parameter set fits all documents. Therefore, the parameters are usually tuned in a time-consuming manual process to every individual document. To simplify this procedure, this paper introduces a classifier for the legibility of an enhanced historic text document. Experiments on the binarisation of a set of documents from 1938 to 1946 show that the classifier can be used to automatically derive robust filter settings for a variety of documents.

Yizkor Book collections contain firsthand commemorative accounts of events from the era surrounding the rise and fall of Nazi Germany, including documents from before, during, and after the Holocaust. Prior to our effort, information regarding the content and location of each Yizkor Book volume was limited. We established a centralized index and metadata repository for the Yizkor Book collection and developed a detailed search interface accessible worldwide.

This paper discusses the architecture and performance of a prototype switch for interconnecting IBM RISC System/6000 workstations. The paper describes the interconnection architecture and performance on a cluster of four IBM RISC System 6000 model 340 workstations. It also describes the driver level software interface to the switch and the features incorporated to minimize communication overhead. The performance measurements cover communication latency and bandwidth. In addition, performance measurements of Express, a popular parallel-programming interface, are provided.>

A strategy for assessing the suitability of a general-purpose parallel processor computer architecture for medical imaging is presented. The research objectives and planned phases of the research are outlined. The results of a survey of previous work in this field are summarized. A methodology for assessing the performance of multiprocessor medical imaging machines is introduced. An algorithm developed to threshold voxel-based image data on a hypercube is described. The current status of the research and future activities are presented.>

In many three-dimensional imaging applications the three-dimensional scene is represented by a three-dimensional array of volume elements, or voxels for short. A subset Q of the voxels is specified by some property. The objects in the scene are then defined as subsets of Q formed by voxels which are “connected” in some appropriate sense. It is often of interest to detect and display the surface of an object in the scene, specified say by one of the voxels in it.

A representation for binary coded ternary (BCT) numbers is proposed. This representation is then used for the introduction of algorithms for ternary addition and subtraction on binary hardware. In the algorithm introduced, distinction is made between basic algorithms, i.e., those which are independent of the type of the arithmetic, and those which are dependent upon it. Some suggestions as to the significance of this approach for nonternary arithmetic are presented.