DIFF Subgroup
G06F 18/213 Feature extraction, e.g. by transforming the feature space; Summarisation; Mappings, e.g. subspace methods
Introduced: January 2023
Full Title
Pattern recognition > Analysing > Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation > Feature extraction, e.g. by transforming the feature space; Summarisation; Mappings, e.g. subspace methods
IPC and CPC are identically structured here. All 7 subcodes exist in both systems.
IPC defines codes here since 2023.
Child Classifications
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- G06F 18/2131 based on a transform domain processing, e.g. wavelet transform since 2023 IPC+CPC Available in IPC and CPC
- G06F 18/2132 based on discrimination criteria, e.g. discriminant analysis since 2023 +1 CPC IPC+CPC Available in IPC and CPC
- G06F 18/2133 based on naturality criteria, e.g. with non-negative factorisation or negative correlation since 2023 IPC+CPC Available in IPC and CPC
- G06F 18/2134 based on separation criteria, e.g. independent component analysis since 2023 +5 CPC IPC+CPC Available in IPC and CPC
- G06F 18/2135 based on approximation criteria, e.g. principal component analysis since 2023 +1 CPC IPC+CPC Available in IPC and CPC
- G06F 18/2136 based on sparsity criteria, e.g. with an overcomplete basis since 2023 IPC+CPC Available in IPC and CPC
- G06F 18/2137 based on criteria of topology preservation, e.g. multidimensional scaling or self-organising maps since 2023 +1 CPC IPC+CPC Available in IPC and CPC