•A novel, self-calibrating screen-perimeter is evaluated (IPS panel with integrated photometer).•Test performance was compared to full, external calibration and also the clinical gold-standard.•In 32 ...healthy observers, the perimeter was as accurate and reliable as the gold-standard.•It was also sensitive enough to detecting normal variations in sensitivity across the visual field.•Self-calibrating screens may provide a low-cost alternative to current gold-standard perimeters.
This study evaluated the feasibility of using a ‘self-calibrating’ display (EIZO CG277) to perform screen-based threshold perimetry. Such displays incorporate their own integrated photometer, so could potentially be used ‘straight out of the box’, without the need for time-consuming and costly luminance calibration by skilled experts. Concerns remain, however, due to the fact that the internal calibration of such devices is imperfect, and lingering doubts regarding the accuracy of screen-based perimetry in general. To evaluate such a system, automated static threshold perimetry was performed in thirty-two normal-sighted adults. In one condition, participants performed a novel screen-based perimetry test, for which the screen was calibrated extensively using traditional photometric techniques/equipment. In a second condition, the same test was performed, but the display was calibrated using only the screen’s integrated photometer (and assuming uniformity across the display). For reference, participants also completed a traditional visual-field assessment using a Humphrey Field Analyzer (HFA). All three tests were performed twice to assess test-retest repeatability (six tests total). The results showed no differences when comparing screen-based perimetric measurements made with internal self-calibration vs full manual calibration (either in terms of mean sensitivity, pointwise sensitivity, test-retest repeatability, or test duration). Furthermore, the accuracy and precision of both were indistinguishable from the current gold standard (HFA), although the HFA was approximately two minutes (~30%) faster. These results indicate that self-calibrating commercial monitors can be used to perform screen-based perimetry almost as well as current clinical devices, and without the need for any specialized knowledge or equipment to setup or maintain. This could facilitate perimetric testing in currently hard-to-reach settings, such as community centers, stroke wards, homes, rural locations, or developing countries.
On 11 November 1912, in Cambridge, England, Lawrence Bragg's discovery of Bragg's Law and his solution of the first crystal structure (ZnS) were announced. During 1913, he and his father, William ...Bragg, established the new science of X-ray crystallography. In 1914, their research was halted by the Great War. During 1915, Lawrence began to develop artillery sound-ranging on the Western Front, and in November 1915 father and son shared the Nobel Prize in Physics. In the same year Lawrence's younger brother and dearest friend were both mortally wounded. Through 1917, sound-ranging reached an extraordinary level of precision, and in 1918 it played a major role in the Allied victory. When war ceased six years later, on 11 November 1918, Lawrence Bragg had created a new field of science, won a Military Cross, been awarded a Nobel Prize and an OBE, and would soon be appointed to Rutherford's Chair at Manchester. He was just twenty-eight years old!
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
This manuscript introduces a pointing interface for a tabletop display with a reflex in eye-hand coordination. The reflex is a natural response to inconsistency between kinetic information of a mouse ...and visual feedback of the mouse cursor. The reflex yields information on which side the user sees the screen from, so that the screen coordinates are aligned with the user's position.
This manuscript introduces the basic idea of a shadow-cursor for calibrating the screen coordinates of tabletop displays. The shadow-cursor is an invisible mouse cursor. We explain how the ...shadow-cursor works to calibrate the screen coordinates and discuss its properties of accuracy, and then show that the shadow-cursor has the potential to align the screen coordinates.
This manuscript introduces a technique for pointing on large tabletop displays for collaborative work. In an environment of large tabletop displays, some contents might be out of the users' reach and ...the coordinates of the screen might not be aligned with the users' positions. A reflex in eye-hand coordination is a natural response to inconsistency between kinetic information of a mouse and visual feedback of the mouse cursor. The reflex yields information on which side the user sees the screen from, so that the coordinates of the screen are aligned with the user's position. Once the coordinates of the screen are aligned, the user can manipulate the mouse cursor in a usual manner.
Recent interests in large displays has led to the rapid development of multi-projector tiled display wall systems, which comprises of an array of individual projectors, and usually driven by a ...cluster of PCs. Here we design a video players system for playing video streams on tiled display wall systems. The video players system includes two components, server and a set of client players. The server decodes and divides the video streams selected by users, and then broadcasts the video segments to each client players according to their positions. Each client players renders the video segments sent by the server, and deals with geometry calibration and color calibration problems based on preset calibration matrix. Test results show that the above players system can play multiple types of video with high quality and high performance.
PDF
