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In this paper, we describe a method to photogrammetrically estimate the intrinsic and extrinsic parameters of fish-eye cameras using the properties of equidistance perspective, particularly vanishing point estimation, with the aim of providing a rectified image for scene viewing applications. The estimated intrinsic parameters are the optical center and the(More)
Radial distortion in an image is a geometric distortion that causes a non-linear variation in resolution across the image, with a higher spatial resolution in the central areas of the image, and lower resolution in the peripheral areas of the image. This is particularly evident in fish-eye cameras, with very wide fields-of-view. Equidistant fish-eye cameras(More)
The development of electronic vision systems for the automotive market is a strongly growing field, driven in particular by customer demand to increase the safety of vehicles both for drivers and for other road users, including vulnerable road users (VRUs), such as pedestrians. Customer demand is matched by legislative developments in a number of key(More)
The majority of computer vision applications assumes that the camera adheres to the pinhole camera model. However, most optical systems will introduce undesirable effects. By far, the most evident of these effects is radial lensing, which is particularly noticeable in fish-eye camera systems, where the effect is relatively extreme. Several authors have(More)
— The majority of computer vision applications assume the pin-hole camera model. However, most optics will introduce some undesirable effects, rendering the assumption of the pin-hole camera model invalid. This is particularly evident in cameras with wide fields-of-view. The aim of distortion correction is, therefore, to transform the distorted view of(More)
A technique for calibrating a lens in the automotive environment to compensate for radial distortion introduced by wide-angle or fish-eye lenses, without the need for a dedicated calibration environment, is proposed. At present, car manufacturers are endeavouring to introduce systems that provide the driver with views of the car's surroundings that are not(More)
In Africa there is a need to increase food security especially in the dry season when livelihoods are most at risk. The fingerpond concept is designed to exploit fringe wetlands sustainably for food production whilst conserving swamp integrity and biological diversity. The concept is a marriage of natural wetland phenomena with the historic activities of(More)
Alum sludge discharge effects on a natural wetland on the shores of Lake Victoria at Gaba in Uganda has been investigated. The water quality in the swamp, the sediment chemistry and plant growth and productivity were monitored. The subsequent application of alum sludge discharges shows no immediate, noticeable, adverse overall effects on the water quality(More)
The capacity of a pilot project subsurface flow constructed wetland in the tropics to remove phenol from pre-treated pulp and paper mill wastewater was studied under varying hydraulic retention times (HRT) with batch loading. Initial 15 months results indicate that removal efficiencies for phenol were variable but on average reached 60% at 5-day HRT and 77%(More)