Abstract: Methods, systems, and techniques for visual automatic transcription of music played on a musical keyboard instrument. The system receives a video input of the musical instrument being played. A transcribing application detects a keyboard section of a background frame of the video input by detecting a shape of the keyboard and the presence of keys in the shape. The keys are detected in the background image and the positional information and associated musical notes of each key is determined. A difference image is obtained by subtracting the background image from the current frame. A musical note is determined for the pressed key based on the positional information and associated musical notes of the keys in the background image.