J-wave extraction and analysis method based on non-negative matrix factorization

The invention relates to methods for extraction and analysis of J waves, in particular to a J-wave extraction and analysis method based on non-negative matrix factorization. The J-wave extraction and analysis method based on non-negative matrix factorization comprises the following steps that electrocardiosignals with J-wave source signals are obtained, and an initial value matrix V1 and an initial value matrix V2 are obtained through preprocessing; a hybrid matrix W and a source signal matrix H are obtained through reconstruction errors, the hybrid matrix W and the source signal matrix H are initialized, and then a non-negative matrix W' and a non-negative matrix H' are obtained; convergence of an objective function is achieved through respective iterative algorithms of the non-negative matrix W' and the non-negative matrix H', and H1 and H2 are obtained; after the H1 and the H2 are combined, J-wave source signals are obtained, conversion is conducted on the J-wave source signals, digital features are obtained through extraction, and the J-wave source signals with the same digital feature are classified into the same type. By the adoption of the J-wave extraction and analysis method based on non-negative matrix factorization, J waves are successively extracted, the extraction precision of the J waves meets the requirement, analysis about time domain, frequency domain, power spectral density and spectrum is conducted on the J waves, the features of the J waves are obtained through extraction, the J waves with the same digital feature are classified into the same type, and then a doctor makes accurate diagnosis for a patient referring to clinical cases.