1,720,956 research outputs found
Image Processing for Machine Vision Applications
Get PDFL'abstract è presente nell'allegato / the abstract is in the attachmen
Producing green computing images to optimize power consumption in OLED-based displays
Get PDFEnergy consumption in Organic Light Emitting
Diode (OLED) depends on the displayed contents. The power
consumed by an OLED-based display is directly proportional to
the luminance of the image pixels. In this paper, a novel idea
is proposed to generate energy-efficient images, which consume
less power when shown on an OLED-based display. The Blue
color component of an image pixel is the most power-hungry
i.e. it consumes more power as compared to the Red and Green
color components. The main idea is to reduce the intensity of
the blue color to the best possible level so that the overall power
consumption is reduced while maintaining the perceptual quality
of an image. The idea is inspired by the famous “Land Effect”,
which demonstrates that it is possible to generate a full-color
image by using only two color components instead of three.
experiments are performed on the Kodak image database. The
results show that the proposed method is able to reduce the power
consumption by 18% on average and the modified images do not
lose the perceptual quality. Social media platform, where users
scroll over many images, is an ideal application for the proposed
method since it will greatly reduce the power consumption in
mobile phones during surfing social networking applications
MTFCalculator – A Mobile Application for Measuring the Modulation Transfer Function of Built-in Cameras of Smartphones Using ISO 12233 Slanted-Edge Method
No full textThe Modulation Transfer Function (MTF) is the most commonly used measure to test the performance of optical systems. A reliable and least complex method to find the MTF is by using the slanted-edge target, an ISO 12233 standard for measuring the quality of image capturing devices. The computation of MTF is a multi-step process, in which the three main components are the Edge Spread Function (ESF), the Line Spread Function (LSF), and the MTF. This paper presents the development of a mobile application to measure the MTF50 values to assess the performance of built-in smartphone cameras. Experiments have been performed using six different smartphones, including, Huawei Mate 10 Pro, Huawei P20 Pro, iPhone XS Max, iPhone 11, iPhone 11 Pro, and JiaYu S3. The experimental results are compared with Imatest, which is one of the most leading tools for testing the performances of imaging devices. The results of both the applications are exactly the same in terms of ranking the smartphones according to their MTF50 values
On producing energy-efficient and contrast-enhanced images for OLED-based mobile devices
No full textOrganic Light-Emitting Diode (OLED) display panels have become increasingly popular in recent years due to their numerous advantages over traditional LCDs. The power consumption in OLED-based displays highly depends on the displayed contents. This paper utilizes the image-dependent power-consuming quality of OLED displays to produce energy-efficient and contrast-enhanced images that consume less power and have better visual quality compared to their original form when displayed on an OLED device. The goal of reducing the power consumption in images is achieved by lowering the RGB intensity levels in color images. This idea is inspired by the “Land-Effect”, which reveals that a full-color image can be generated by using only two color components instead of three. However, in this work, a modified Land-Effect has been proposed to yield better results as compared to the original Land-Effect. The proposed method also uses some image enhancement algorithms such as white balance and retinex filter to produce quality enhanced images that have visually better color contrasts as compared to the original images. The real power consumption of the modified images was measured on Samsung Galaxy A50, an OLED-based mobile device. The experimental results demonstrated that the proposed method reduced the power consumption by 13.16% on average. Moreover, to assess the visual quality of images and to understand the user acceptability of the modified images, a subjective evaluation was also performed. The subjective test results showed a higher preference rate for the modified images as compared to the original images. The proposed system in its current form is suitable for server-side implementation where an image would be modified once and the modified image could be used indefinitely by millions of users on social media platforms
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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