Videotapes of a trial will be replayed in the privacy of a judge's room at their leisure to help them assess the case, Singapore's Today newspaper reported.

"The judge can make observations of the demeanour of the witness. He may fidget or look uneasy -- gestures that give the impression that he is not telling the truth," the Supreme Court Registrar, Chiam Boon Keng, told the daily.

"This will enhance the decision-making process."

Currently, judges rely largely on their notes, transcripts and their recollection of relevant details when they pen their decisions.

"A picture speaks clearer than a thousand words," Chiam said.

"This is something new. We need to test the system and make changes to the rules," he said.