American Sign Language fingerspelling recognition from video: Methods for unrestricted recognition and signer-independence
Table 3.1: Letter error rate (%) on four test signers.
['Signer', 'Tandem HMM 1', 'Tandem HMM 2', 'Tandem HMM 3', 'Tandem HMM 4', 'Tandem HMM  [BOLD] Mean', 'Rescoring SCRF 1', 'Rescoring SCRF 2', 'Rescoring SCRF 3', 'Rescoring SCRF 4', 'Rescoring SCRF  [BOLD] Mean', '1st-pass SCRF 1', '1st-pass SCRF 2', '1st-pass SCRF 3', '1st-pass SCRF 4', '1st-pass SCRF  [BOLD] Mean']
SCRF rescoring improves over the tandem HMM, and the first-pass SCRF outperforms the others. The poor performance is perhaps to be expected with such a small number of training signers.