S everal features of a laser scanner contribute to the level of defi nition it is capable of achieving in a high-defi nition survey. This article provides insight into spot size, as I have found that many professionals do not fully understand or appreciate the important subtleties of this feature. As reported in an earlier article (Professional Surveyor Magazine, February 2005), several feature...

We describe a method for converting conventional threechannel flatbed scanners into colorimeters. The method is based on the simple idea of placing a color filter between the image and the scanner sensors and making an additional scan.

Improvement of ultrasound images should be guided by their diagnostic value. Evaluation of clinical image quality is generally performed subjectively, because objective criteria have not yet been fully developed and accepted for the evaluation of clinical image quality. Based on recommendation 500 from the International Telecommunication Union Radiocommunication (ITU-R) for such subjective qual...

RATIONALE AND OBJECTIVES The purpose of this study was to assess the work-in-progress prototype of an image-guided, robotic system for accurate and consistent placement of transperineal needles into the prostate with intraoperative image guidance inside the gantry of a computed tomographic (CT) scanner. MATERIALS AND METHODS The coach-mounted system consists of a seven-degrees-of-freedom, pas...

A spectrophotometric scanner has been assembled for applications concerning the conservation of paintings and of other works of art with plane surface. Its optical components, that are a lens, a spectrometer and a monochrome matrix CCD digital camera, are arranged in axial configuration. A frame of the camera allows the image acquisition of a strip of the scene collecting the reflectance spectr...

We suggest the method t o recover the 3D shape of the object by using the color image scanner which has three light sources. The photometric stereo is traditional t o recover the surface normal of the object using the multiple light sources. In this method, it usually assumes the distant light sources to make the model simple. But the light sources in the image scanner are so close t o the obje...

The purpose of this study was to identify optimal CT acquisition parameter settings for each make and model of scanners used in a large Radiation Oncology (RO) Department, considering the special requirements of CT simulation. Two CT phantoms were used to evaluate the image quality of the five different multi-channel CT scanners using helical scan mode. We compared the effects of various pitch,...

Chen, Yi-Ting Ph.D., Purdue University, May 2015. Laser Scanner Jitter Characterization, Page Content Analysis for Optimal Rendering, and Understanding Image Graininess. Major Professor: Jan P. Allebach. In Chapter 1, the electrophotographic (EP) process is widely used in imaging systems such as laser printers and office copiers. In the EP process, laser scanner jitter is a common artifact that...

This letter describes a data acquisition setup for recording, and processing, running speech from a person in a magnetic resonance imaging (MRI) scanner. The main focus is on ensuring synchronicity between image and audio acquisition, and in obtaining good signal to noise ratio to facilitate further speech analysis and modeling. A field-programmable gate array based hardware design for synchron...

I MOIRE PATrERNS AND TWO· DIMENSIONAL ALIASING IN LINE SCANNER DATA ACQUISITION SYSTEMS C. D. McGillem T. E. Riemer I The basic mechanism underlying the generation of Moire patterns in line scanner data acquisition systems is examined. A general expression 1s developed in terms of typical system parameters for the reproduced image of such systems and the interaction of the image spectrum; the r...