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This article presents a spectrum-based local image descriptor, namely, Radial Fourier Analysis (RFA) image descriptor. The RFA descriptor uses Fourier transform to convert the image gradients in the local region of a keypoint from spatial domain to frequency domain. The transformed gradient frequencies are then analysed to obtain the principle description within the local region. The principle description...
The quality of fused images mostly depends on the number of source images available. On the other hand, the optimal fusion of large numbers of images still remains as a nontrivial process. This paper presents a fuzzy logic based method which is able to mitigate such a difficulty. In our approach, we first aligned the spatial resolutions of inputs to the desired value and satisfied the histogram matching...
A natural yet relatively unexplored way to classify hand gestures is to first count the number of fingers identifiable in a hand image. Feature variations introduced through imperfect hand segmentation or unconstrained gesture input hampers the performance of present boundary-based finger identification techniques. In this paper, we describe an adaptive parameterless procedure that strategically decomposes...
This paper provides a performance evaluation on the Scale- invariant Feature Transform (SIFT) descriptors that utilise different sizes of image patches to represent the SIFT keypoints in images. Although SIFT has been widely employed in numerous applications such as object recognition and image registration, its performances against different image complexities and transformations are still unclear...
A vision-based smart building control system relies upon human action recognition to determine the number of occupants inside the building and their respective motion type or path. Using this information, a control system that can automatically optimise environmental conditions within the building can be designed. Furthermore, information obtained is also used to aid in other domains such as security...
Fuzzy logic theories, in the past decades, have been used as a popular basis for designing motion controllers. In this research, a fuzzy logic controller is designed for a truck and multiple trailer system where the controller generates the drive velocity and turn rate for only the truck. Instead of relying solely on human expert inputs, an automatic fuzzy rule tuning approach is adopted. This problem...
Ellipses and elliptical features are evident in abundance, in a wide variety of digital images. Much of these features carry within itself useful statistical and geometrical information that can be exploited for a broad range of real-world applications. Algorithms developed of late for ellipse detection are application specific and are mainly based on traditional least-square fitting and Hough transform...
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