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 21 for “"Colour images"”.
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Design and analysis of Discrete Cosine Transform-based watermarking algorithms for digital images. Development and evaluation of blind Discrete Cosine Transform-based watermarking algorithms for copyright protection of digital images using handwritten signatures and mobile phone numbers.
… for copyright protection of digital still images using handwritten signatures and mobile phone numbers. The new algorithms take into account the perceptual capacity of each low frequency coefficients inside the Discrete Cosine Transform (DCT) blocks before embedding the watermark …
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Design and analysis of Discrete Cosine Transform-based watermarking algorithms for digital images. Development and evaluation of blind Discrete Cosine Transform-based watermarking algorithms for copyright protection of digital images using handwritten signatures and mobile phone numbers
… for copyright protection of digital still images using handwritten signatures and mobile phone numbers. The new algorithms take into account the perceptual capacity of each low frequency coefficients inside the Discrete Cosine Transform (DCT) blocks before embedding the watermark …
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Texture measures for segmentation
… in both human and computer vision. Segmenting images into regions of constant texture is used in many applications. This work surveys a wide range of texture descriptors and segmentation methods to determine the state of the art in texture segmentation. Two types of texture descriptors are …
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A new finite-difference time-domain method applied to an open waveguide structure.
… which were observed. Also presented are colour images of the simulation which give the reader an idea as to the nature and level of detail of the information which can be obtained from the simulation.
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Knowledge, attitudes and practices of oral health care workers of Lesotho regarding the management of patients with oral manifestations of HIV/AIDS
… with HIV. A visual aid depicting seven colour images of lesions strongly associated with HIV was used to assess knowledge. Data was analysed using Microsoft Excel® and the R statistical package. The outcome of the study was then presented using tables and charts as appropriate. …
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Automated dust storm detection using satellite images. Development of a computer system for the detection of dust storms from MODIS satellite images and the creation of a new dust storm database
… However, satellite remote sensing using true-colour images or estimates of aerosol optical thickness (AOT) and algorithms such as the deep blue algorithm have limitations for identifying dust storms. Many researchers have studied the detection of dust storms during daytime in a number of …
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Extending minkowski norm illuminant estimation
The ability to obtain colour images invariant to changes of illumination is called colour constancy. An algorithm for colour constancy takes sensor responses - digital images - as input, estimates the ambient light and returns a corrected image in which the illuminant influence over the colours has …
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N-colour separation methods for accurate reproduction of spot colours
In packaging, spot colours are used to print key information like brand logos and elements for which the colour accuracy is critical. The present study investigates methods to aid the accurate reproduction of these spot colours with the n-colour printing process. Typical n-colour printing systems …
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Combined robust and fragile watermarking algorithms for still images. Design and evaluation of combined blind discrete wavelet transform-based robust watermarking algorithms for copyright protection using mobile phone numbers and fragile watermarking algorithms for content authentication of digital still images using hash functions.
… protection and content authentication for still images. New blind transform domain block based algorithms using one-level and two-level Discrete Wavelet Transform (DWT) were developed for copyright protection. The mobile number with international code is used as the watermarking data. The robust …
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Adaptive Compression Algorithm For Full Colour Three Dimensional Integral Images
The aim of the work is to compress digitised images, which contain three-dimensional information, in order that they can be efficiently stored and communicated. The nature of the three-dimensional images investigated is such that there is strong correlation between sub-image elements. It is …
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Identification and characterisation of submesoscale activity over the continental shelf in the Bay of Biscay
… based on the analysis of remotely sensed images (high resolution ocean colour MODIS 800m) of Chlorophyll-α concentration, Sea Surface Temperature and Suspended Particulate Matter in view of identifying and characterizing submesoscale activity developing in the vicinity of the Loire River. …
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Modelling grey-level intensities for smart phones to view medical images
… for mobile phones in order to view medical images in greyscale using different mobile phones. While medical image format of DICOM employs a Greyscale Standard Display Function (GSDF) that describes the relationship between luminance level and display intensity values, medical images that …
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Enhancing the Resolution and Predicting the Accuracy of Point Clouds Generated by Handheld 3D Scanners in Construction
… lidar scans by fusing them with high-resolution colour images, and (2) it employs these higher-resolution scans to progressively reconstruct a scene. The second method is designed to make real-time predictions on point cloud accuracy, which are based on the estimations of uncertainty levels in …
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The impact of the Galapagos Islands on the dynamics of the equatorial East Pacific
… data from ships and moorings; satellite SST and colour images; and diagnostics from both a sophisticated ocean general circulation model and a simplified (reduced gravity) model. Each model was run both with and without a representation of the Galapagos. It is found that under typical conditions …
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A near infrared Tully-Fisher survey behind the Galactic plane
… for the Hi-detected galaxies. The survey images have an exposure time of 10 min resulting in a limiting magnitude approximately 2m deeper than the 2MASS survey and the SIRIUS camera has a 00:045 pix -1 pixel scale and 7:07 _ 7:07 field of view. The three-colour images were searched by eye …
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An intelligent system for the classification and selection of novel and efficient lossless image compression algorithms
… important challenge of saving these large-sized images and transferring them over networks. With the increase in image size, the interest in image compression is increasing as well, to improve the storage size and transfer time. In this study, the researcher proposes two new lossless image …
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Contributions to the taxonomy of South African hermit crabs (Crustacea: Decapoda: Paguroidea) – integrating microCT scanning and barcoding
… list published by W. Emmerson in 2016. Because colour images are provided for 51 out of 72 species, Chapter 8 can also be used as a preliminary guide. However, this study has shown that the hermit crabs of South Africa are by far more diverse than originally thought, and the summary, which …
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Investigation of the effects of image compression on the geometric quality of digital protogrammetric imagery
… are living in a decade, where the use of digital images is becoming increasingly important. Photographs are now converted into digital form, and direct acquisition of digital images is becoming increasing important as sensors and associated electronics. Unlike images in analogue form, digital …
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Historical changes on rocky shores in the Western Cape, as revealed by repeat photography
… 1980). Taxonomy has been a benefactor, since colour images taken in the field can be used to record distinctive characteristics of organisms that may later lose their pigmentation during preservation (George 1980). Of more relevance to this paper are the many uses of photography in marine …
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