The Development Of Brigthness Evaluation Method For Digital Billboards

LED-based billboards are becoming increasingly popular due to their low cost, flexibility, and efficiency. On another side, the too-bright digital billboard may pose a potential threat to road safety. The driver’s perception of advertising depends on the different factors, including the billboard’s luminance value. The aim of the study was to develop the assessment method for the digital screen parameters (luminance or illumination) which could be applied by supervising authorities, using budget-friendly devices, such as a lux meter and could be used during the billboard active operation. We tested the recommended method of OAAA and concluded that it is not applied for large billboards (over 25 square-meter) due to the calculated far distance and low sensitivity of lux meter. We have developed the new method based on driver discomfort glare and De Boer ratio. The ratio helps to determine how likely a display is to cause discomfort to those around it. The lower the value, the less discomfort the driver will experience from the billboard. The new method is applied for the active and different size billboard and using lux meter that is not an expensive device. Moreover, we take into account the glare effect of billboard on drivers’ vision.

POLUSI CAHAYA VIDEOTRON PADA PERSIMPANGAN JALAN TAMAN MENTENG BINTARO

Architectural lighting design aims to improve the image and aesthetics of an area or building at night known as the concept of city beautification, the lighting must also be able to meet the criteria of safety, orientation and security when implemented in areas or buildings with complex activities such as in an area adjacent to the traffic flow. Technological advances resulted in the change of commercial media communication facilities, such as static billboards turned into LED videotrons. The placement of videotrons needs to be considered on roads with motorized traffic flow, as it allows for the risk of accidents, as well as light pollution especially at night. This study used The Post Occupancy Evaluation (POE) method, the extent of the influence of videotron light on the comfort of driving a motor vehicle at the intersection of videotron Menteng Bintaro Park. The result of this research that the placement of videotron is the policy of local government, vendors and environmental managers by paying attention to the AMDAL before and after the facilities are installed, with road safety complementary facilities such as road boundaries and shock lines. Information about commercial advertisements on videotron Taman Menteng Bintaro as much as 80% for pedestrians and motorists get the information, compared to motorists as much as 60% do not get information. The light effect of videotron greatly affects the surrounding environment and there is a glare effect of light that changes suddenly with results for pedestrians (80%), motorists (60%) and the least of the motorists (50%), because of the more comfortable condition in driving. Desain pencahayaan arsitektural bertujuan untuk meningkatkan citra dan estetika sebuah kawasan atau bangunan pada malam hari yang dikenal dengan konsep city beautification, pencahayaan tersebut juga harus mampu memenuhi kriteria keselamatan, orientasi dan keamanan ketika diimplementasikan pada kawasan atau bangunan dengan aktivitas yang kompleks seperti pada sebuah kawasan yang berdekatan dengan arus lalu lintas. Kemajuan teknologi mengakibatkan perubahan sarana komunikasi media komersial, seperti papan reklame yang statis berubah menjadi videotron LED. Penempatan videotron perlu diperhatikan pada jalan dengan arus lalu lintas kendaran bermotor, karena memungkinkan untuk terjadinya resiko kecelakaan, serta polusi cahaya terutama pada malam hari. Penelitian ini menggunakan metoda Post Occupancy Evaluation (POE), sejauh mana pengaruh cahaya videotron terhadap kenyamanan mengemudi kendaraan bermotor di persimpangan videotron Taman Menteng Bintaro. Hasil penelitian ini adalah bahwa penempatan videotron merupakan kebijakan Pemda, vendor dan pengelola lingkungan dengan memperhatikan AMDAL sebelum dan sesudah fasilitas terpasang, dengan fasilitas pelengkap keamanan jalan seperti batas jalan dan garis kejut. Informasi mengenai iklan komersial pada videotron Taman Menteng Bintaro sebanyak 80% untuk pejalan kaki dan pengendara mobil mendapatkan informasinya, berbanding terbalik dengan pengendara motor sebanyak 60% tidak mendapatkan informasi. Efek cahaya dari videotron sangat mempengaruhi lingkungan sekitar dan terjadi efek silau dari cahaya yang berubah secara tiba-tiba dengan hasil untuk pejalan kaki (80%), pengendara motor (60%) dan paling sedikit dari pengendara mobil (50%), karena kondisi yang lebih nyaman dalam berkendara.

Asymmetric Brightness Effects With Dark Versus Light Glare-Like Stimuli

The glare effect is a brightness illusion that has captured the attention of the vision community since its discovery. However, its photometrical reversal, which we refer to here as photometrical reversed glare (PRG) stimuli, remained relatively unexplored. We presented three experiments that sought to examine the perceived brightness of a target area surrounded by luminance gradients in PRG stimuli and compare them with conventional glare effect configurations. Experiment 1 measured the brightness of the central target area of PRG stimuli through an adjustment task; the results showed that the target appeared brighter than similar, comparative areas not surrounded by luminance gradients. This finding was unexpected given the recent report that PRG stimuli cause pupil dilation. Meanwhile, Experiments 2 and 3 implemented a rating task to further test the findings in Experiment 1. Again, the study found a robust brightening illusion in the target area of PRG stimuli in a wide range of target and background luminance. The results are discussed in comparison with the brightness enhancement of the glare effect.

Spatial–Spectral Evidence of Glare Influence on Hyperspectral Acquisitions

Glare is an unwanted optical phenomenon which affects imaging systems with optics. This paper presents for the first time a set of hyperspectral image (HSI) acquisitions and measurements to verify how glare affects acquired HSI data in standard conditions. We acquired two ColorCheckers (CCs) in three different lighting conditions, with different backgrounds, different exposure times, and different orientations. The reflectance spectra obtained from the imaging system have been compared to pointwise reference measures obtained with contact spectrophotometers. To assess and identify the influence of glare, we present the Glare Effect (GE) index, which compares the contrast of the grayscale patches of the CC in the hyperspectral images with the contrast of the reference spectra of the same patches. We evaluate, in both spatial and spectral domains, the amount of glare affecting every hyperspectral image in each acquisition scenario, clearly evidencing an unwanted light contribution to the reflectance spectra of each point, which increases especially for darker pixels and pixels close to light sources or bright patches.

Adaptive Head Light System using Image Processing

The project introduce a prototype of an adaptive head light system using image processing. This system is focused on the lighting angle of low beam in the headlights with its light moved horizontally. The controller in head light is based on image processing from a camera mounted front side of the car. This system decrease the ‘glare’ effect of the headlights and increase the drivers visibility based on survey. Index Terms –Adaptive head light system, headlights

Universal Automobile Headlight Control Module for High Beam Adaptation during Night Vision Travel an Embedded Design Approach

Road accidents during night travel increases day by day and vision impairment due to high beam contributes to the majority of the total fatalities. Headlights of vehicles pose a great danger during night driving. [1] The drivers of most vehicles use high/bright beam while driving at night. This causes a discomfort to the person travelling from the opposite direction. The driver experiences a sudden glare caused due to the high intense headlight beam from the other vehicle coming towards him from the opposite direction. We are expected to dim the headlight to avoid this glare. This glare causes a temporary blindness to a person resulting in road accidents during the night. To avoid such incidents, an embedded prototype of Automatic Headlight adaptor module is proposed. This embedded module automatically switches the high beam to low beam and returns backs to high beam, thus reducing the sudden glare effect. It also eliminates the requirement of manual switching by the driver to switch back to low beam Universal Headlight adaptor module is a unique solution to achieve the above<strong> </strong>objective,<strong> </strong>the headlight intensity of the incoming vehicles causing the glare is automatically attenuated to low beam wirelessly by the nearby vehicles affected by high beam. The interconnected modules at every vehicle independently takes the decision on the head light control of the source vehicle causing the glare by evaluating various parameters like vehicle speed, current GPS location, direction of vehicle etc.

The Glare Effect

The glare effect consists in a strong brightness enhancement of a bright region determined solely by the presence of linear luminance gradients organized in such a way that the bright ends of the gradients delimit the bright region. The effect is obtained with both achromatic and chromatic gradients. In its achromatic version, the illusion has been employed to study the perception of luminosity and the effects of brightness on lightness in simultaneous contrast configurations. The role of photometric gradients and their distribution in space are discussed, with demos showing how luminance gradients can be employed to generate also darkness enhancements and impressions of illumination. A variant of the glare effect is illustrated in which the brightness enhancement is obtained by employing discrete grey steps separated in space, organized to form so-called luminance pseudo-ramps.