mlbench (version 2.1-5)

Vehicle: Vehicle Silhouettes

Description

The purpose is to classify a given silhouette as one of four types of vehicle, using a set of features extracted from the silhouette. The vehicle may be viewed from one of many different angles. The features were extracted from the silhouettes by the HIPS (Hierarchical Image Processing System) extension BINATTS, which extracts a combination of scale independent features utilising both classical moments based measures such as scaled variance, skewness and kurtosis about the major/minor axes and heuristic measures such as hollows, circularity, rectangularity and compactness.

Four "Corgie" model vehicles were used for the experiment: a double decker bus, Cheverolet van, Saab 9000 and an Opel Manta 400. This particular combination of vehicles was chosen with the expectation that the bus, van and either one of the cars would be readily distinguishable, but it would be more difficult to distinguish between the cars.

Usage

data("Vehicle", package = "mlbench")

Format

A data frame with 846 observations on 19 variables, all numerical and one nominal defining the class of the objects.

[,1]	Comp	Compactness
[,2]	Circ	Circularity
[,3]	D.Circ	Distance Circularity
[,4]	Rad.Ra	Radius ratio
[,5]	Pr.Axis.Ra	pr.axis aspect ratio
[,6]	Max.L.Ra	max.length aspect ratio
[,7]	Scat.Ra	scatter ratio
[,8]	Elong	elongatedness
[,9]	Pr.Axis.Rect	pr.axis rectangularity
[,10]	Max.L.Rect	max.length rectangularity
[,11]	Sc.Var.Maxis	scaled variance along major axis
[,12]	Sc.Var.maxis	scaled variance along minor axis
[,13]	Ra.Gyr	scaled radius of gyration
[,14]	Skew.Maxis	skewness about major axis
[,15]	Skew.maxis	skewness about minor axis
[,16]	Kurt.maxis	kurtosis about minor axis
[,17]	Kurt.Maxis	kurtosis about major axis
[,18]	Holl.Ra	hollows ratio
[,19]	Class	type

References

Turing Institute Research Memorandum TIRM-87-018 "Vehicle Recognition Using Rule Based Methods" by Siebert,JP (March 1987)

Blake, C.L. & Merz, C.J. (1998). UCI Repository of Machine Learning Databases. Irvine, CA: University of California, Irvine, Department of Information and Computer Science. Formerly available from http://www.ics.uci.edu/~mlearn/MLRepository.html.

Examples

data("Vehicle", package = "mlbench")
summary(Vehicle)