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 43 for “"Color Images"”.
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Denoising and Demosaicking of Color Images
Most digital cameras capture images through Color Filter Arrays (CFA), and reconstruct the full color image from the CFA image. Each CFA pixel only captures one primary color component at each pixel location; the other primary components will be estimated using information from neighboring pixels. …
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A digital processor for color images
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1981.
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Automatic human face detection in color images
… human faces in unconstrained and complex images remains a challenging problem in computer vision. An automatic system that possesses a similar capability as the human vision system in detecting faces is still a far-reaching goal. This thesis focuses on the problem of detecting human laces …
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Segmentation of color images for interactive 3D object retrieval
… information that is not contained in the images. This work presents a segmentation framework based on a general model of visual processing. The task is split into three stages, each dealing with knowledge at different levels of abstraction. The image-based segmentation stage exclusively …
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Quantization of color images using the modified median cut algorithm
… display devices allow only a limited number of colors to be displayed concurrently. Digitized color images typically contain several hundred to several thousand different colors. If these color images are to be viewed on displays with a limited color palette, the number of colors used to …
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Multi-resolution region-preserving segmentation for color images of natural scene
… image features such as position, intensity, and color. These methods tend to produce over-segmented results, especially for images of natural scenes whose regions contain complex but coherent mixture of colors. This thesis describes a multi-resolution segmentation algorithm which rst constructs a …
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Compression artifact suppression for color images with dual-domain SE-ARResNet
… used in digital imaging. Restoring high-quality images from their compressed JPEG counterparts, however, is an ill-posed inverse problem but could be of great use in improving the visual quality of images. With the representational power that convolutional neural networks (CNNs) demon- strate, we …
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Modulation transfer function measurements, image quality metrics, and subjective image quality for soft-copy color images
The effect 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 Models for Image Decomposition
… is a study of image decomposition techniques for color images. The decomposition of color images presents a new challenge since the choice of the color model has an effect on the resulting images. The color models are tested for both structure + noise and cartoon + texture decomposition. Numerical …
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Artistic and semantic progressive image coding
… and it entirely ignores the semantics of images. We propose to render different artistic visual effects and leverage semantic information in the images. The key insight is human visual system is more sensitive to luminance and semantic salient objects. Our learning based progressive coding …
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Wavelet-based Image Compression Using Human Visual System Models
… These trials included 14 observers, 4 grayscale images and 10 color images (both natural and synthetic). For grayscale images, although our HVS scheme lowers PSNR, it improves subjective quality. For color images, our HVS model improves both PSNR and subjective quality. A benchmark for our HVS …
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Color Face Recognition using Quaternionic Gabor Filters
… technique for automated face recognition, using color images. One of the more powerful techniques for recognition of faces in monochromatic images has been extended to color by the use of hypercomplex numbers called quaternions. Two software implementations have been written of the new method and …
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Color, Texture, and Shape Features for Content-Based Image Retrieval
… of monochrome texture methods to work with color images and discuss their use in segmentation. We also perform a database retrieval accuracy test to quantitatively compare the performance of several texture methods. Based on the test results, we make observations on how color information can …
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Integrated vision framework for a robotics research and development platform
… the MIT Media Lab. Featuring representations for images and camera sensors, this system provides a structure that is used to build robot vision applications. One application shows how to merge the representations of two different cameras in order to create a camera entity that provides images with …
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New methods in image compression using multi-level transforms and adaptive statistical encoDing
… need to meet the demand for high quality digital images, with comparatively modest storage requirements, is driving the development of new image compression techniques. This demand has spurred new techniques based on time to frequency spatial transformation methods. At the core of these methods …
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Map-guided hyperspectral image superpixel segmentation using semi-supervised partial membership latent Dirichlet allocation
… algorithms which are suitable for the regular color images like images with three channels: red, green and blue (RGB images) have been developed in the literature. However, because of the high dimensionality of hyperspectral imagery, these regular superpixel segmentation algorithms often do not …
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Battery-Free Wireless Imaging of Underwater Environments
… power up from harvested acoustic energy, capture color images using ultra-low-power active illumination and a monochrome image sensor, and communicate wirelessly at net-zero-power via acoustic backscatter. We demonstrate the potential of this method in wireless battery-free imaging of animals, …
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Depth sensor based object detection using surface curvature
… robust feature sets. By using conventional color images as input, researchers have achieved major success. Recent dramatic advances in depth imaging technology triggered significant attention to revisit object detection problems using depth images as input. Using depth information, we …
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