Determining statistical descriptors of a signal from a set of its samples
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsWieslaw Jerzy Szajnowski, Miroslaw Bober
Life of this patent
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Abstract
An entity is subjected to an interrogating signal, and the reflection from the entity is repeatedly sampled to obtain a first set of values each dependent on the intensity of the reflected signal. A logarithmic transformation is applied to the sample values to obtain a second set of values. A set of descriptor values is derived, the set comprising at least a first descriptor value (L) representing the difference between the mean and the median of the second set of values, and a second descriptor value (D) representing the mean of the absolute value of the deviation between each second set value and an average of the second set of values.
Claims20
A method of representing an entity, comprising:
- repeatedly sampling a signal from the entity to obtain a first set of values each dependent on the intensity of the received signal;
- applying a logarithmic transformation to the sample values to obtain a second set of values;
- and
- deriving a set of descriptor values, the set comprising at least a first descriptor value (L) representing the difference between the mean and the median of the second set of values, and a second descriptor value (D) representing the mean of the absolute value of the deviation between each second set value and the average of the second set of values.
A computer program arranged to derive a set of descriptors representing an entity from a first set of values obtained by sampling a signal received from the entity, the program being arranged to convert the first set of values into a second set of values by applying a logarithmic conversion to the values of the first set, to derive a first descriptor value (L) representing the difference between the mean and the median of the second set of values, and to derive a second descriptor value (D) representing the mean of the absolute value of the deviation between each value of the second set and an average of the second set of values.
Signal processing apparatus responsive to a first set of values obtained by sampling a signal received from an entity and arranged to derive a set of descriptors representing the entity, the apparatus being arranged to convert the first set of values into a second set of values by applying a logarithmic conversion to the values of the first set, to derive a first descriptor value (L) representing the difference between the mean and the median of the second set of values, and to derive a second descriptor value (D) representing the mean of the absolute value of the deviation between each value of the second set and an average of the second set of values.
Dependencies are inferred from the claim text.