NDLI: Multi-directional colour edge detector using LQS convolution

Content Provider	IET Digital Library
Author	Yasmin, Shagufta Sangwine, Stephen J.
Abstract	A new linear colour image filter based on linear quaternion systems (LQSs) is introduced. It detects horizontal, vertical, left- and right-diagonal edges with a single LQS convolution mask. The proposed filter is a canonic minimal filter of four LQS filters, each with different angles of rotation combined parallel wise. Different angles of rotation are a key features of the new filter such that horizontal, vertical, left, and right-diagonal LQS filter masks rotate pixels through angles π / 2 , 5 π / 2 , 3 π / 2 , and 7 π / 2 , respectively. Although, the four LQS masks are combined parallel to make a single LQS mask but derived using four quaternion convolutions, one for each direction of edges, the LQS filter produces a result without the combination of results from four separate edge detectors. This methodology could be generalised to design more elaborate LQS filters to perform other geometric operations on colour image pixels. The proposed filter translates smoothly changing colours to different shades of grey and produces coloured edges in multiple directions, where there is a sudden change of colour in the original image. Another key idea of the proposed filter is that it is linear because it operates in homogeneous coordinates.
Starting Page	1111
Ending Page	1116
Page Count	6
ISSN	17519659
Volume Number	12
e-ISSN	17519667
Issue Number	Issue 7, Jul (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ipr/12/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ipr.2017.0921
Journal	IET Image Processing
Publisher Date	2018-02-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Colour Image Pixel Computer Vision And Image Processing Technique Edge Detection Edge Direction Filtering Method in Signal Processing Grey Shades Homogeneous Coordinate Horizontal-diagonal Edge Image Colour Analysis Image Filtering Image Recognition Left-diagonal Edge Linear Colour Image Filter Linear Quaternion System LQS Filter Multidirectional Colour Edge Detector Quaternion Convolution Right-diagonal Edge Single-LQS Convolution Mask Vertical-diagonal Edge
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering Computer Vision and Pattern Recognition Software

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