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In this paper, by using geodesic distance and compactness prior, we present some effective improvements concerning the two important aspects of diffusion-based methods: the construction of the diffusion matrix and seed vector. First, based on the geodesic distance, we construct a 2-layer knn graph. Compared with the most frequently used 2-layer neighborhood graph, our graph does not only effectively...
Modern cameras have an image sensor with millions of pixels, among which some of them are inevitably defective (known as hot pixels). Moreover, the number of hot pixels will increase with ageing. colour filter array (CFA) demosaicing will result in colour artifacts caused by these hot pixels. Such artifacts are virtually impossible to remove after demosaicing. In this paper, we propose two effective...
The notion of subjective image quality (SIQ) is particularly difficult to define as it depends on a large variety of physical attributes and psycho-physical factors. One important attribute which SIQ depends on is the illumination under which visual stimuli are observed. Recent studies have shown that achromatic fidelity (i.e. perceived resemblance in lightness) is significantly less dependent on...
Human biometrics are regarded as groundbreaking tools for preserving privacy and security in many computer vision applications such as, biometric authentication, secure access control, visa processing, and border checking. Biometric features such as, fingerprint, face, retina, iris patterns, voice waves, palm print and signatures are commonly used in biometric authentication. However, in recent years...
An automated flowering assessment system for mango orchards was proposed. Segmentation of flowers from a complex background (i.e. leaves, branches and ground) was achieved based on (i) colour correction via adjustment of the brightness and contrast to a reference level, to rectify the illumination variability spatially within and between images; (ii) colour thresholding with fixed thresholds to separate...
Lidars can be extremely useful tools for measuring outdoor geometry. However while lidar measurements are championed for their high accuracy their point clouds are individually rather sparse and lack colour information. In this work the sparse nature of lidar point clouds is addressed by merging multiple lidar scans into a single large point cloud. This is done by restricting the lidar motion to a...
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