Low-Cost Tiled Display System Architecture with Dynamic Web-Based Management

In this paper, a scalable hardware and software architecture for tiled display systems (a.k.a. videowalls), which can be implemented by using low-cost devices, together with a dynamic web-based management and configuration service are proposed. It has been designed to support both stored and live broadcast/broadband content, in mosaic or warp distributions. The displays and devices can be dynamically configured via web in different ways: the displays can create a single display of a larger size;or they can be configured in a customized way in order to playout different media contents in different display combinations. As display renderers, low-cost devices are proposed as the main hardware element to obtain affordable videowall systems. As a proof of concept, two prototypes have been implemented, including an accurate synchronization mechanism based on a Master/Slave control scheme and aggressive and smooth playout adjustment techniques. To evidence the good performance of the prototypes and configuration service, both objective and subjective evaluations have been conducted regarding synchronization accuracy and usability. On the one hand, the mean values of the asynchronies between the video playout processes in each display are kept below 25ms (i.e., frame accuracy). On the other hand, the obtained usability score in the System Usability Scale (SUS) test has been 88.65, which is considered as excellent.

Phase-only Correlation Measurement with Computer-controlled LCD and CCD Image Processing System

Using computer-controlled liquid crystal display (LCD) as an image processor and a CCD camera as a detector, phase-only correlation measurement is performed with the aid of joint transform correlation method (JTC). This computer -controlled LCD-CCD image processing system may be a powerful tool for defect detection, position control and pattern recognition. It enables new possibilities in analog real-time image processing. This is of great interest in microelectronic manufacturing today and in the future.

Divergence and correlated evolution of male wing spot and courtship display between Drosophila nepalensis and D.trilutea

Male-specific wing spots are usually associated with wing displays in the courtship behavior of Drosophila and may play important roles in sexual selection.Two closely related species,D.nepalensis and D.trilutea,differ in wing spots and scissoring behavior.Here,we compare male morphological characters,pigmentation intensity of male wing spots,wing-scissoring behavior,courtship songs,and reproductive isolation between 2 species.F1 fertile females and sterile males result from the cross between females of D.nepalensis and males of D.trilutea.The pigmentation of wing spots is significantly weaker in D.trilutea than in D.nepalensis and the F1 hybrid.Males scissor both wings in front of the female during courtship,with a posture spreading wings more widely,and at a faster frequency in D.nepalensis than in D.trilutea and the F1s.Males of D.trilutea vibrate wings to produce 2 types(A and B)of pulse songs,whereas D.nepalensis and the F1s sing only type B songs.The incidence of wing vibration and scissoring during courtship suggests that wing vibration is essential but scissoring is a facultative courtship element for successful mating in both species.The association between the darker wing spots with more elaborate scissoring might be the consequence of correlated evolution of these traits in D.nepalensis;however,D.trilutea retains wing scissoring during courtship despite having weaker pigmentation of wing spots.The genetic architecture of 2 traits differs in the F1s,consistent with maternal or sex-linked effects for spots but nonadditive effects for scissoring.