Representation of spatial-frequency data as a map
A method for representing the structural information in a biological or physical sample is disclosed. In this method, a time-frequency representation of the spatial distribution within a sample is transformed into a color representation of the data. Furthermore, due to the directional sensitivity of the method for gathering the data, information about the structural anisotropy of the sample can also be encoded from the data. The application of this method to one or more regions within the sample enables a map to be generated which clearly illustrates quantitative measures of the structures present.
1. A method of obtaining, analyzing and representing data from a specimen comprising:
acquiring from the specimen, signal magnitude versus position along a prism shaped region of the specimen;
selecting a segment length that is longer than the structural features of the specimen desired to be analyzed and represented and shorter than the prism;
using the chosen segment length, performing a spatial frequency analysis on each of adjacent or overlapping segments along the prism to obtain magnitude versus spatial frequency over a range of spatial frequencies in each segment;
for each segment, associating a distribution of colors to the range of spatial frequencies and associating an intensity of each color with the magnitude of the associated spatial frequency;
finding a polychromatic color having an intensity representing a combination of the colors and the respective magnitudes of the colors for each segment; and
providing an output of the polychromatic colors versus position along the prism.
2. The method of claim 1 wherein the method is repeated for adjacent prisms.
3. The method of claim 1 wherein the output of the polychromatic colors versus position along the prism is provided by color components of the polychromatic colors versus position along the prism.