A method for performing a fast fourier - transformation and a fast fourier transformation inverse - -

摘要

The bite detector determines movement of a fishing line by analysing an optical image of the line. The preferred embodiment of the invention comprises an optical sensor 40 for producing a digital image characteristic of the surface of a length of fishing line, means 42 for digitally storing the digital image, and a digital processor 44 for comparing a current digital image with the stored digital image in order to determine the direction of movement of the fishing line. The optical sensor may view the line through window 26.