Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 485 for “"Image quality"”.
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Image Quality Analysis Using GLCM
… help understand the details about the overall image content. The aim of this research is to investigate the use of the gray level co-occurrence matrix technique as an absolute image quality metric. The underlying hypothesis is that image quality can be determined by a comparative process in …
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Modulation transfer function measurements, image quality metrics, and subjective image quality for soft-copy color images
… of spatial frequency manipulation of color images and its impact on subjective image quality were examined by measuring subjective image quality and the changes in several prominent image quality metrics. The Modulation Transfer Function Area (M1F A), the Square Root Integral (SQRI), the …
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Color image quality measures and retrieval
The focus of this dissertation is mainly on color image, especially on the images with lossy compression. Issues related to color quantization, color correction, color image retrieval and color image quality evaluation are addressed. A no-reference color image quality index is proposed. A novel …
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RECONSTRUCTION MODELS TO IMPROVE IMAGE QUALITY
High-resolution images provide more information for better post-processing such as detection, recognition, segmentation, identification, and visualization. The need for high-resolution images occurs in health care, where the physician needs a high-quality image of the patient in order to make …
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The effects of image quality on reading performance and perceived image quality from CRT and hard-copy displays
The effects of physical image quality on reading and on perceived image quality from CRT and hard copy were studied in this experiment. The results showed that as the image quality of a display increased, indicated by an increase in the value of the MTFA, the reading speed increased and subjective …
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Aspect of image quality and the Internet
The colour reproduction of images viewed across the Internet is an area of significant importance due to the recent increase in the levels of on-line shopping and the number of digital imaging libraries accessible over the Internet. The quality of images viewed on-line can be affected by variables …
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Image Quality Evaluation in Lossy Compressed Images
This research focuses on the quantification of image quality in lossy compressed images, exploring the impact of digital artefacts and scene characteristics upon image quality evaluation. A subjective paired comparison test was implemented to assess perceived quality of JPEG 2000 against baseline …
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Scene-Dependency of Spatial Image Quality Metrics
… imaging performance and the modelling of spatial image quality in digital capturing systems. Spatial imaging performance and image quality relate to the objective and subjective reproduction of luminance contrast signals by the system, respectively; they are critical to overall perceived image …
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Anthropomorphic Model for Medical Image Quality Assessment
… dissertation explores advancements in task-based image quality assessment through the development and evaluation of an anthropomorphic visual search model observer. The model incorporates a novel threshold mechanism inspired by human visual system principles, particularly emphasizing the selective …
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Image Quality Analysis in Dual-Source CT
… CT medical application, in which three sets of image data can be obtained by two independent X ray tubes to achieve a better tissue differentiation. In the present work, the noise, low contrast and high resolution behavior is measured for the Siemens DSCT system Definition and then compared with …
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Modelling image quality for automotive display technologies
The aim of this thesis is to link perceived image quality to physical display parameters. This is done in the context of automotive displays. Specialities of automotive display applications like high ambient lighting conditions and the necessity to access information quickly are explained. A …
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Antenna Aperture Illumination, Resolution, and Image Quality
Made available in DSpace on 2014-12-04T21:03:08Z (GMT). No. of bitstreams: 1 5902045.pdf: 6642583 bytes, checksum: 495f132bea80de9df26f4050d2b34153 (MD5) Previous issue date: 1959
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The effect of scene content on image quality
Device-dependent metrics attempt to predict image quality from an ‘average signal’, usually embodied on test targets. Consequently, the metrics perform well on individual ‘average looking’ scenes and test targets, but provide lower correlation with subjective assessments when working with a variety …
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Dose and image quality considerations in computed tomography
… the immediate needs of the clinical task (image quality) with future risks due to the imaging procedure (dose). We developed a method to estimate the shape and thickness of materials yielding attenuation equivalent to that of bow-tie-shaped filters in clinical scanners. The results are …
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Effect of Image Sharpening on Radiographic Image Quality
… and processing of the digital radiographic images may contain artifacts that could reduce the diagnostic value of dental radiographs. This phenomenon has been reported through various case reports. However, its effect on radiographic image quality has not been studied. The purpose of this …
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Inverse Scattering Image Quality with Noisy Forward Data
Image quality metrics for several inverse scattering methods and algorithms are presented. Analytical estimates and numerical simulations provide a basis for poor image quality diagnostics. The limitations and noise behavior of reconstructed images are explored analytically and empirically using a …
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