Browsing by Subject "Color"

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20. yüzyılda vitray sanatının Türkiye’deki gelişimi
(Bilkent University, 2023) Yıldız, Alperen; Erkan, Bilal; Yüce, Enisa Berra; Seydanoğlu, Özge; Bolat, Zeynep Sude
Tarihi 4. Yüzyıla kadar dayanan vitray sanatı, cam sanatlarının alt dallarından birisidir. Temel ögelerini ışık, cam ve renklerin oluşturduğu bu sanat; 20. Yüzyıla kadar uzun bir değişim ve gelişim sürecinden geçmiştir. Vitray sanatının eski Anadolu coğrafyasından 20. Yüzyıl Türkiye’sine olan evrimi, geçmişin birikimi ve 20. Yüzyılın modern sanat akımlarıyla sentezlenmiştir. Vitray sanatının Türkiye’deki koşulları ve bu koşulların sanatçılara etkisi de bu sanatın Türkiye’deki gelişiminde büyük pay sahibidir. Diğer el sanatlarında olduğu gibi vitray sanatında da endüstriyelleşme hem sanat eserlerini hem de sanatın yakın geleceğini doğrudan ilgilendirir. Bu sebeplerden ötürü sanatçılar, sanatseverler vitrayın geleceği ve pekiştirilmesi hususunda önemli bir role sahiptir.
Open Access
AC-driven, color-and brightness-tunable organic light-emitting diodes constructed from an electron only device
(2013) Zhao, Y.; Chen, R.; Gao, Y.; Leck, K.S.; Yang X.; Liu, S.; Abiyasa, A.P.; Divayana, Y.; Mutlugun, E.; Tan, S.T.; Sun H.; Demir, Hilmi Volkan; Sun X.W.
In this paper, a color- and brightness-tunable organic light-emitting diode (OLED) is reported. This OLED was realized by inserting a charge generation layer into an electron only device to form an n-i-p-i-n structure. It is shown that, by changing the polarity of applied voltage, only the p-i-n junction operated under positive bias can emit light and, by applying an AC voltage, emission from both junctions was realized. It is also shown that, by using a combination of blue- and red-emiting layers in two p-i-n junctions, both the color and brightness of the resulting white OLED can be tuned independently by changing the positive and negative amplitudes of the AC voltage. © 2013 Elsevier B.V. All rights reserved.
Open Access
The aid of colour on spatial navigation: A study in a virtual hospital environment
(ACM, 2016) Kumaoğlu, Özge; Olguntürk, Nilgün
The aim of this study is to explore the effects of colour as visuo-spatial cue on spatial navigation and developing a cognitive map in elderly in a simulated virtual hospital environment. The study further purports to explore whether it is possible to improve elders' spatial navigation and cognitive mapping performances as well as younger-aged group, by the aid of coloured visuo-spatial cues. © 2016 ACM.
Open Access
The architectural colour design process: an evaluation of sequential media via semantic ratings
(John Wiley & Sons, 2010-01) Ural, S. E.; Yilmazer, S.
In recent studies, contextual situations of applied colours are compared to colours presented as samples or chips. Findings of such studies point out different results in terms of similarities or differences between the evaluations of isolated abstract colours and contextualized situations. Architectural and spatial contexts have their own characteristics regarding colouring criteria, so it is of great importance to examine the architectural spatial colouring process from this point of view. This study explores this process by investigating the consistency of semantic ratings of four sequential stages of the architectural colour design process, namely, colour chips samples, abstract compositions, perspective drawings and 3D models. The architectural context for the study was a simple interior space. Fifteen different colour schemes were applied on the four media representing the stages. Subjects rated the 15 sets against seven bipolar, five-step semantic differential scales. The scales consisted of harmonious-discord, pleasant-unpleasant, comfortableuncomfortable, spacious-confined, static-dynamic, exciting-calming and extroverted-introverted. Findings indicated that there are significant associations between the evaluations of the abstract compositions, the perspective drawings and the 3D models; however, the evaluations of colour chips are significantly different than the others. The medium effect observed mostly between abstract and contextualized media. Additionally, factor analysis showed that pleasantness, harmony, spaciousness and comfort are connected in the evaluations of contextual situations, while pleasantness and harmony differ from spaciousness and comfort in the evaluations of colour chips and abstract compositions. The factor of activity (arousal) (dynamism, excitement, and extroversion) stays the same for all four media. It is also found that different colour characteristics are determinative over different media. © 2010 Wiley Periodicals, Inc.
Open Access
Architectural requirements for energy efficient execution of graph analytics applications
(IEEE, 2015-11) Özdal, Muhammet Mustafa; Yeşil, Şerif; Kim, T.; Ayupov, A.; Burns, S.; Öztürk, Özcan
Intelligent data analysis has become more important in the last decade especially because of the significant increase in the size and availability of data. In this paper, we focus on the common execution models and characteristics of iterative graph analytics applications. We show that the features that improve work efficiency can lead to significant overheads on existing systems. We identify the opportunities for custom hardware implementation, and outline the desired architectural features for energy efficient computation of graph analytics applications. © 2015 IEEE.
Open Access
Color and visual complexity in abstract images
(Wiley, 2018) Kocaoğlu, Rengin; Olguntürk, Nilgün
One of the more important aspects of vision is color perception, which involves aesthetic and psychological responses. The aim of this study is to understand the association between color and visual complexity in abstract images. It is hypothesized that, as the intelligibility of colors in an abstract image decreases, visual complexity and visual interest will increase until there is over unintelligibility where complexity and interest will decrease. In addition, as the difficulty in distinguishing the rules and the variety of colors used in images increases, visual complexity and visual interest will also increase. Abstract images are selected since they are independent from the visual references of the actual world, and are basics of art and architecture. The results revealed that images that were evaluated as visually complex and interesting were the ones that they had difficulty in finding a color harmony and indicate a huge variety of colors to the extent that differentiation between hues becomes very difficult.
Open Access
Color and visual complexity in abstract images: Part II
(Wiley Periodicals, Inc., 2019) Kocaoğlu-Aslanoğlu, Rengin; Olguntürk, Nilgün
There are a limited number of studies examining color, visual complexity, and visual interest together, and one of the recent studies that tried to bring a new understanding to the association between color, visual complexity, and visual interest was the first part of the current study. Most of the well‐known color studies researching the effects of color on psychology, physiology, emotion, mood, attention, well‐being, visual complexity, and visual interest used isolated color patches that might be lacking in reflecting the dominating factors. Thus, the aim of this study was to find the relationship between visual complexity, visual interest, and color difference (ΔE) values of colors in abstract images, and it was hypothesized that, as the average ΔE value of colors in an abstract image increases, visual interest and visual complexity will increase until reaching a threshold where visual interest and visual complexity start to decrease. In order to test the hypothesis, a new abstract image was generated and colored. The generated abstract image was rated by 120 undergraduate students from the Faculty of Art, Design and Architecture. As the results of the study indicated, there was an inverted U‐curve relationship between average ΔE values and both visual interest and visual complexity in abstract images.
Open Access
Color contribution to children's wayfinding in school environments
(2007) Helvacıoğlu, Elif
The purpose of this study is to explore the contribution of color to children’s wayfinding ability in school environments and to examine the differences between different colors in terms of their remembrance and usability in route learning process. The experiment was conducted with three different sample groups for the three different experiment sets that were differentiated by their color arrangement. The participants were a total of 100 primary school children aged 7-8 years-old. The study was conducted in five phases. Firstly, participants were tested for color vision deficiencies and familiarity with the experiment site. Secondly, they were escorted on the experiment route by the tester one by one, from starting point to the end point and were asked to lead the tester to the end point by the same route. Thirdly, they were asked to verbally describe the route. Fourthly, they were asked to recognize the specific colors at their specific locations. Finally, they were asked to direct the location of the end point with their finger. It was found that color has a significant effect on children’s wayfinding and pointing task performances in school environments. However, there were not any differences between different colors in terms of their remembrances in route finding task. In addition, the correct identifications of specific colors and landmarks were depending on their specific locations. Contrary to the literature, gender differences were not found in the accuracy of route learning and pointing task performances.
Open Access
Color holographic reconstruction using multiple SLMs and LED illumination
(SPIE, 2009-01) Yaraş, Fahri; Onural, Levent
A color holographic reconstruction technique by using three light emitting diodes (LEDs) is described. Reflective type phase-only spatial light modulators (SLMs) are used since they are suitable for in-line phase holograms. Gerchberg-Saxton iterative algorithm is used for computing phase holograms. Three phase holograms are calculated separately for red, green and blue colors, for a color reconstruction, and separately loaded to corresponding SLMs. Three LEDs are used for illuminating those phase holograms and reconstructions are combined and captured. Experimental results are satisfactory. © 2009 SPIE-IS&T.
Open Access
Color naming
(1998) Şahin, Ebru
In this study, visual aspects of color and neurophysiological processes involved in the phenomenon, language of color and color models were explained in addition to the discussion of different ideas, orientations and previous works behind the subject of matter. Available color terms in Turkish language have been identified and the most frequently known or used non-basic color terms have been attained. An experimental research has been conducted to investigate the resemblance of the basic, and mostly used non-basic color terms, in the minds of the native speakers of Turkish language. Using Munsell Color System, color ranges, reflecting the color naming and color perception of Turkish Society, have been constructed for each color term investigated in the experimental research.
Open Access
Color preferences in terms of value and chroma in university students’ dormitory rooms
(2022-06) Koz, Serra
Environments are considered as interior and exterior, both of which color is a vital part. The existing preferences studies mainly focus on hue and not enough on value and chroma which of three is the perceptual variables of color. Value has shown to be a more prominent factor in affecting color preferences than hue. The main goal of this research is to explore the relation of chroma and value to the preferences of university students. In this regard, university students expressed their preferences for 12 different surfaces taking place in the interiors of a dormitory room. Each surface was analyzed separately and the results showed that university students prefer high value in their color selections for dormitory rooms, except for two surfaces. The relationship between chroma and preferences have shown significant correlation except for the cabinet. Chroma and value were found to have a weak negative correlation. In the final part of the study, the role of gender was analyzed, considering the fact that dormitories are designed based on gender. The results indicated that gender and color preferences have a significant relationship regarding specific surfaces, differing among genders. Two surfaces were found to have statistically significant relations to males, namely, the walls, the floor and two surface showed significance for females, that are, the floor and the cabinet. All in all, the results indicate a common propensity for high value and low chroma with chromatic colors as well as a minor role of gender, effective in color preferences studies.
Open Access
Color vision in humans and computers
(IEEE, 2008) Boyacı, Hüseyin; Akarun L.
Humans and many other species rely on color for object recognition. What are the biological underpinnings of color vision and how can we computationally model human color perception? In this study we briefly summarize recent advences regarding the very early, retinal stages of color vision, as well as recent behavioral models of color perception in three dimensional world within rich context. We also emphasize the recent events on the neuroimaging front that allow the researchers begin to systematically study the cortical processes related to color vision. ©2008 IEEE.
Open Access
A color-based face tracking algorithm for enhancing interaction with mobile devices
(Springer, 2010-05) Bulbul, A.; Cipiloglu, Z.; Capin, T.
A color-based face tracking algorithm is proposed to be used as a human-computer interaction tool on mobile devices. The solution provides a natural means of interaction enabling a motion parallax effect in applications. The algorithm considers the characteristics of mobile useconstrained computational resources and varying environmental conditions. The solution is based on color comparisons and works on images gathered from the front camera of a device. In addition to color comparisons, the coherency of the facial pixels is considered in the algorithm. Several applications are also demonstrated in this work, which use the face position to determine the viewpoint in a virtual scene, or for browsing large images. The accuracy of the system is tested under different environmental conditions such as lighting and background, and the performance of the system is measured in different types of mobile devices. According to these measurements the system allows for accurate (7% RMS error) face tracking in real time (20-100 fps). © Springer-Verlag 2010.
Open Access
Color‐emotion associations in interiors
(Wiley, 2020-02) Güneş, E.; Olguntürk, Nilgün
Emotional reactions to red, green, blue, and gray colors in a living room were investigated using a self‐report measure. Participants first watched a short video of a 3D model of a living room. Next, they were asked to match the living rooms with facial expressions of six basic emotions. The most stated emotions associated for the red room were disgust and happiness, while the least stated emotions were sadness, fear, anger, and surprise; for the green room, neutral and happiness were the most stated emotions, and anger, surprise, fear, and sadness were the least stated ones; for the blue room, neutral was the most stated emotion, while the least stated emotions were anger and surprise. Neutral, disgust, and sadness were the most stated emotions for the gray room. Gender differences were not found in human emotional reactions to living rooms with different wall colors.
Open Access
Colour and design: from natural patterns to monochrome compositions
(Elsevier, 2011-03) Olguntürk, N.; Demirkan, H.
There is no doubt that nature provides endless inspiration to the world of design. In order to explore the role of colour in design, forty-two people were asked to first choose a pattern from nature, then to abstract this pattern into geometric shapes and finally to colour this pattern. All work done by the participants were statistically analysed to find out the effect of colour on design. Findings of the study suggest that colour in a pattern is the first principal component of design as a unifier whereas this is replaced with the number of shapes in one group in black and white patterns.
Open Access
Colour naming
(Elsevier, 2006) Ekici, E. Ş.; Yener, C.; Camgöz, N.
An experimental study exploring colour ranges corresponding to different colour names has been conducted. Available colour terms in Turkish language have been identified and the most frequently known or used colour terms have been attained. Using the Munsell Color System, colour ranges reflecting the colour naming and colour perception of Turkish people, have been constructed for each colour term. The discussion of the findings and observations during the research are also included.
Open Access
Compression of images in CFA format
(IEEE, 2006) Cüce, Halil İbrahim; Çetin, A. Enis; Davey, M. K.
In this paper, images in Color Filter Array (CFA) format are compressed without converting them to full-RGB color images. Green pixels are extracted from the CFA image data and placed in a rectangular array, and compressed using a transform based method without estimating the corresponding luminance values. In addition, two sets of color difference (or chrominance) coefficients are obtained corresponding to the red and blue pixels of the CFA data and they are also compressed using a transform based method. The proposed method produces better PSNR values compared to the standard approach of bilinear interpolation followed by compression.
Open Access
Computer vision based method for real-time fire and flame detection
(Elsevier BV, 2006-01-01) Töreyin, B. U.; Dedeoǧlu, Y.; Güdükbay, Uğur; Çetin, A. Enis
This paper proposes a novel method to detect fire and/or flames in real-time by processing the video data generated by an ordinary camera monitoring a scene. In addition to ordinary motion and color clues, flame and fire flicker is detected by analyzing the video in the wavelet domain. Quasi-periodic behavior in flame boundaries is detected by performing temporal wavelet transform. Color variations in flame regions are detected by computing the spatial wavelet transform of moving fire-colored regions. Another clue used in the fire detection algorithm is the irregularity of the boundary of the fire-colored region. All of the above clues are combined to reach a final decision. Experimental results show that the proposed method is very successful in detecting fire and/or flames. In addition, it drastically reduces the false alarms issued to ordinary fire-colored moving objects as compared to the methods using only motion and color clues. © 2005 Elsevier B.V. All rights reserved.
Open Access
Critical role of CdSe nanoplatelets in color-converting CdSe/ZnS nanocrystals for InGaN/GaN light-emitting diodes
(OSA - The Optical Society, 2016) Hasanov N.; Sharma, V. K.; Martinez, P. L. H.; Tan S.T.; Demir, Hilmi Volkan
Here we report CdSe nanoplatelets that are incorporated into color-converting CdSe/ZnS nanocrystals for InGaN/GaN light-emitting diodes. The critical role of CdSe nanoplatelets as an exciton donor for the color conversion was experimentally investigated. The power conversion efficiency of the hybrid light-emitting diode was found to increase by 23% with the incorporation of the CdSe nanoplatelets. The performance enhancement is ascribed to efficient exciton transfer from the donor CdSe nanoplatelet quantum wells to the acceptor CdSe/ZnS nanocrystal quantum dots through Fï¿½rster-type nonradiative resonance energy transfer.
Open Access
Differences in illumination estimation in #thedress
(Association for Research in Vision and Ophthalmology Inc., 2017) Toscani, M.; Gegenfurtner, K. R.; Doerschner, K.
We investigated whether people who report different colors for #thedress do so because they have different assumptions about the illumination in #thedress scene. We introduced a spherical illumination probe (Koenderink, Pont, van Doorn, Kappers, & Todd, 2007) into the original photograph, placed in fore-, or background of the scene and-for each location-let observers manipulate the probe's chromaticity, intensity and the direction of the illumination. Their task was to adjust the probe such that it would appear as a white sphere in the scene. When the probe was located in the foreground, observers who reported the dress to be white (white perceivers) tended to produce bluer adjustments than observers who reported it as blue (blue perceivers). Blue perceivers tended to perceive the illumination as less chromatic. There were no differences in chromaticity settings between perceiver types for the probe placed in the background. Perceiver types also did not differ in their illumination intensity and direction estimates across probe locations. These results provide direct support for the idea that the ambiguity in the perceived color of the dress can be explained by the different assumptions that people have about the illumination chromaticity in the foreground of the scene. In a second experiment we explore the possibility that blue perceivers might overall be less sensitive to contextual cues, and measure white and blue perceivers' dress color matches and labels for manipulated versions of the original photo. Results indeed confirm that contextual cues predominantly affect white perceivers.