This website uses cookies to ensure you have the best experience. Learn more

No Reference Quality Assessment Essay

2078 words - 9 pages

In web applications, images and videos are transmitted over transmission networks of all kinds. For efficient use of band width and also storage memory space, images are compressed mainly using lossy compression techniques. The result of lossy compression is introduction of artifacts such as blockiness, ringing and blurring which degrades quality of the images. The channel noise also contributes in quality loss. In the field of video processing and image processing image quality assessment is essential and challenging problem. Image quality assessment plays a vital role to evaluate various image processing algorithm and systems. There are enormous examples like image acquisition, storage, retrieval, watermarking, authentication, enhancement, compression and synthesis. So there is an immense need of quantification of image quality [1]. An Image quality assessment is done by two approaches viz Subjective, in which a group of experts and non experts are asked to rate the quality and a score is obtained by taking mean of subject rating. Best way to assess the quality of image is to see it because human being is ultimate receiver in many image processing applications. The subjective evaluation, Mean Opinion Score (MOS) is reliable but it is slow, inconvenient and time-consuming [2]. Differential MOS (DMOS) is also used. The scores given by subjects were converted to different score i.e. difference between the test and the reference image and then converted to Z-score. This scores are scaled to 1-100 range and it is called as differential mean opinion score (DMOS) [3]. Objective evaluation has aim to predict perceived image quality by human being.
Objective image quality assessment is further categorized into Full Reference (FR), Reduced Reference (RR) and No Reference (NR) [4]. In FR original image is used as reference to assess the quality of degraded image. This FR based quality metrics are mainly used in assessing the performance of the channel and compression schemes. The commonly used metrics are peak signal to noise ratio (PSNR), Image fidelity, Correlation coefficient, structural content [5]. PSNR is simple and widely accepted, but also criticized for not correlating with perceived quality measurement [6]. Human visual system based, mean structural similarity index (MSSIM) is based on the theme that, structural information of an image changes if the image is distorted [7, 8]. In RR instead of original image certain features of it are available to assess the quality of reconstructed image. The features are also used for the image repair/ impairment [9]. The feature calculated as wavelet coefficients of distorted image images fitted with Gaussian scale mixture (GSM) distributions. The algorithm computes the average difference between scaled entropies of wavelet coefficients of reference and distorted images [10]. Also another approach is by structural similarity approach. In this approach statistical features are extracted from multiscale...

Find Another Essay On No reference quality assessment

Business Plan for MILO into the Irish market - Dublin Business School, and Year 1 - the launch of MILO into the Irish market

992 words - 4 pages explaining why this should be used. A reference to one academic source would be important here. 10 marks (c) Presentation of the written report. 5 marks will be allocated for overall presentation of the assignment. This will include general layout, attention to detail, spelling & grammar, comprehensiveness and quality of referencing. It will also incorporate the logical structure of the submission including the fluency of sentences, clear transitions

Digital Reference Reflection Essay

2638 words - 11 pages , broadly writ, will no longer be add-ons or peripheral services” (255). This is all well and good, but how does one choose a service, from the boundless available via the Internet and/or software world, that is both effective and efficient, in the future, so that patrons receive quality service. A librarian must look at both the present patronage and the future users, many of whom will grow up without a clue as to what life was like before the

Providing Culturally Competent Care

998 words - 4 pages The National Center for Cultural Competence developed a validated assessment tool “at the request of the Bureau of Primary Health Care (BPHC), Health Resources and Services Administration (HRSA), U.S. Department of Health and Human Service (DHHS)” (National Center for Cultural Competence (NCCC), 2004). The intent of the assessment tool is to “to enhance the delivery of high quality services to culturally and linguistically diverse individuals

Pain Assessment Tools

1240 words - 5 pages appropriate. The nurse will continue to assess every 15 minutes by performing another NIPS assessment (University of Pennsylvania, Almanac, 2002).Asking a patient to rate their pain on a scale of 0 to 10 can assess the quality of a patient's pain. Zero is considered no pain and ten is considered as being the worst pain they have ever experienced. Another common tool to use as a measurable guide for rating pain is The Wong Baker Faces Pain Rating

Alternatives to Outcome Assessment Testing in Higher Education

2137 words - 9 pages , project or other assignment form. Norm reference assessment is a test or performance that compares one group to a larger national sampling. (Glossary of Assessment Terms, 2011). Alternative Assessment Strategies Different types of assessments match variant learning styles. Too often universities will rely on standardized or direct testing to measure student progress. Since the idea of assessment is to gather, analyze and interpret

The Quality of Life for Working Students Living in Davao City

1160 words - 5 pages , and individual values. It takes account of concerns that externally derived norms should not be applied without reference to individual differences. According to Felce (2005) a financial decisions usually involve a trade-off where quality of life is decreased in order to save money or, conversely, quality of life is increased by spending more money. Rosenbaum (2011) said that Quality of Life may also define in terms of the hierarchical need

Assesing the quality of assurance 1.1

750 words - 3 pages Internal quality assurance (IQA) is at the heart of quality assurance both within the national framework and within the quality and management systems of each approved centre. The role, in terms of managing assessment so that it consistently meets national standards, is central to maintaining public confidence in each and every certificate issued, therefore IQA is a key factor in managing ‘risk’ and ensuring that when certificates are claimed

Needs Assessment for Quality Improvement

1899 words - 8 pages Needs Assessment for Quality Improvement Needs Assessment for Quality Improvement A paper submitted in the course of Quality Management and Productivity MGT/449 Michael Shienkaruk University of Phoenix Manuael Todd Davenport December 8, 2008 Abstract Needs Assessment for Quality Improvement As-Is flow chart allows any process to be analyzed to ensure the quality of

In this essay I identify and discuss the assessment methods that I use within my training

1450 words - 6 pages way of assessing student's progression. Observation is ongoing throughout the course, students can be observed even at break times. I find that students relax at break times and discuss things with me that they wouldn't during the course.PRINCIPLES OF ASSESSMENTAssessment is driven by values, values ensure that the assessment-taking place is of quality and is suitable for the course. Below is a list of some of the assessment

A Case for Formative Assessment

2337 words - 9 pages teaching contracts so as to counteract the habits acquired by pupils. Pupils should be equipped for taking responsibility for their learning and effective feedback about the particular quality of work, with advice on improvement facilitates effective learning. There are several ways in which formative assessment takes place during learning in all SoWs and opportunities for mini-reviews can be identified while planning lessons. Many experts have been

Judging Management Potential

4262 words - 17 pages , palmistry, and astrology. ... this material needs a reference cite ..Introduction to Assessment CentersIn the previously discussed methods of assessing managerial potential, there is no certainty that a candidate will operate according to their past performance when they are placed in an unfamiliar and potentially more demanding position. In efforts to help predict the candidate's performance in such a situation, assessment centers place them into a

Similar Essays

Image Quality Assessment Essay

567 words - 3 pages performances of compression techniques. Basically, Image Quality assessment is done by Objective and Subjective approaches. An Objective Image quality assessment is further categorized into 1) Full Reference (FR) 2) No Reference (NR) and 3) Reduced Reference (RR). In the benchmarking of the image compression and restoration algorithms, an original image becomes an ultimate reference for evaluation of the processed image. Quality assessment done by

Users's Perception Towards Reference Chat In Uni Map Library

1039 words - 5 pages services to those who is not a physical access to the library. This also supported by the conclusion from Ruppel and Fagan (2002) which give the same statement of chat reference as being convenience, anonymity, speed, quality of help, and no waiting in line. The result from survey done by Ruppel and Vecchione (2012) stated a few factors contributed to the participants’ enjoyment in using reference chat service, including speed and quality of help

Image Quality Assessment Essay

659 words - 3 pages it with HVS based QA methods incorporating color statistics and inter subband correlations. M. A. Saad [6] developed a general-purpose blind no-reference image quality assessment (IQA) algorithm using a NSS model using Discrete Cosine Transform (DCT) coefficients. The metric uses a simple Bayesian inference model to predict image quality scores using extracted features based on NSS model of image DCT coefficients. Image quality is

User's Perceprtion Towards Reference Chat Essay

836 words - 3 pages wanting to ask what they may perceive to be a dumb question (Gray 2000; Tenopir & Ennis, 1998). Ruppel and Fagan (2002) found that students see the benefits of chat reference as being convenience, anonymity, speed, quality of help, and no waiting in line. Responsiveness Through the meaning from Cambridge Online Dictionary, responsiveness is a noun which reflects the meaning of making a positive and quick reaction to something or someone. In