Vehicle {mlbench}R Documentation

Vehicle Silhouettes


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.




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


These data have been taken from the UCI Repository Of Machine Learning Databases at

and were converted to R format by


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

[Package mlbench version 1.0-0 Index]