A spatio-frequency trade-off scale for scale-space filtering

We study implementation issues for spatial convolution filters and their Fo urier alternative, with the aim to optimize the accuracy of filter output. We focus on Gaussian scale-space filters and show that there exists a trade -off scale that subdivides the available scale range into two subintervals of equal length. Below this trade-off scale Fourier filtering yields more a ccurate results than spatial filtering; above it is the other way around. T his should be contrasted with demands of computational speed, which show th e opposite tenet.