Colour-constant images have been shown to improve visual navigation taking place over extended periods of time. These images use a colour space that aims to be invariant to lighting conditions – a quality that makes them very attractive for place recognition, which tries to identify temporally distant image matches. Place recognition after extended periods of time is especially useful for SLAM ...

The launch of Ocean and Land Colour Instrument (OLCI) on board Sentinel-3A in 2016 is the beginning of a new era in long time, continuous, high frequency water quality monitoring of coastal waters. Therefore, there is a strong need to validate the OLCI products to be sure that the technical capabilities provided will be used in the best possible way in water quality monitoring and research. The...

Visually meaningful patterns (visual patterns) are a set of predefined image blocks representing information the human visual system is very sensitive to. A colour image coding technique based on visual patterns is introduced. An image is divided into small blocks each of which is mapped to one of the visual patterns. Each block can then be represented by the pattern and by the colour informati...

Using styles derived from existing popular character designs, we present a novel automatic stylization technique for body shape and colour information based on a statistical 3D model of human bodies. We investigate whether such stylized body shapes result in increased perceived appeal with two different experiments: One focuses on body shape alone, the other investigates the additional role of ...

Chromatic aberration is observable especially with wide angle lenses. This paper presents a study on chromatic aberration of two fisheye lenses. Both tested lenses produce images with obvious colour aberration. Four different mathematical models were tested to compensate the aberration of distinct colour channels; shift and scale, affine, projective and polynomial. The model parameters were obt...

Single-chip digital cameras use an array of broadspectrum Charge-Coupled Devices (CCD) overlayed with a colour filter array. The filter layer consists of transparent patches of red, green and blue, such that each CCD pixel captures one of these primary colours. To reconstruct a colour image at the full CCD resolution, the ‘missing’ primary values have to be interpolated from nearby samples. We ...

Visual cryptography is a new secure technology that distributes a secret image by separating it into a number of shares using different visual cryptography schemes (VCS). Early VCS schemes mainly focused on black-and-white secret images. Using a black & white VCS normally degrade the image quality and also suffered from a major drawback of pixel expansion, which means that the size of each secr...

18 Cooked prawn colour is known to be a driver of market price and a visual 19 indicator of product quality for the consumer. Although there is a general 20 understanding that colour variation exists in farmed prawns, there has been no 21 attempt to quantify this variation or identify where this variation is most 22 prevalent. The objectives of this study were threefold: firstly to compare thre...

Pairing patterns in monogamous birds are thought to be the consequence of mutual mate choice by males and females for characters linked to individual quality in the opposite sex. Although this may result in assortative pairing for a single character, there may be no simple match between male and female phenotype if the traits linked to individual quality are sex specific. For instance, in sever...

Timely harvest is critical to achieve maximum seed viability and vigour in agricultural production. However, little information exists concerning how to reap the best quality seeds of Leymus chinensis, which is the dominant and most promising grass species in the Songnen Grassland of Northern China. The objective of this study was to investigate and evaluate possible quality indices of the seed...