Showing papers by "Tony Lindeberg published in 1989"

Scale-space for discrete images

Abstract: This article addresses the formulation of a scale-space theory for one-dimensional discrete images. Two main subjects are treated:Which linear transformations remove structure in the sense that the number of local extrema (or zero-crossings) in the output image does not exceed the number of local extrema (or zero-crossings) in the original image?How should one create a multi-resolution family of representations with the property that an image at a coarser level of scale never contains more structure than an image at a finer level of scale?We propose that there is only one reasonable way to define a scale-space for discrete images comprising a continuous scale parameter, namely by (discrete) convolution with the family of kernels T(n; t) = e^{-t} I_n(t),, where $I_n$ are the modified Bessel functions of integer order. Similar arguments applied in the continuous case uniquely lead to the Gaussian kernel.Some obvious discretizations of the continuous scale-space theory are discussed in view of the results presented. An important result is that scale-space violations might occur in the family of representations generated by discrete convolution with the sampled Gaussian kernel.

CanApp : The Candela Application Library

Abstract: This paper describes CanApp, the Candela Application Library. CanApp is a software package for image processing and image analysis. Most of the subroutines in CanApp are available both as stand-alone programs and C subroutines.CanApp currently comprises some 50 programs and 75 subroutines, and these numbers are expected to grow continuously as a result of joint efforts of the members of the CVAP group at the Royal Institute of Technology in Stockholm.CanApp is currently installed and running under UNIX on Sun workstations