A 3D local energy surface detector for confocal microscope images

The ability to detect features within confocal microscope images is important for the interpretation and analysis of such data. Most detectors are gradient based, and so are sensitive to noise, and fail to accurately locate some feature types that are important in confocal microscopy. The local energy feature detector developed by M.C. Morrone and R.A. Omens (1987) marks locations where there is maximal congruence of phase in the Fourier components of an image. Points of maximal phase congruency occur at all common feature profiles: step and roof edges, line features and Mach bands. A 3D implementation of the local energy feature detector, suitable for confocal microscope data, is presented. The detector computes local energy by convolving an image with oriented pairs of 3D filters. The filters are 3D versions of Morlet wavelets. To increase the speed of the convolution, the filters are designed in frequency space and multiplied by the image´s Fourier transform. Results are presented for real confocal images and synthetic 3D image volumes