Patent ID: 8582926

Claim:
A hand-held scanning system, comprising: an analog encoder, generating an analog signal, wherein the analog signal represents a mapping relation of a movement distance of the hand-held scanning system and a corresponding signal intensity; an analog-to-digital converter being coupled to the analog encoder for sampling the analog signal to form a digital signal, wherein the digital signal represents a mapping relation between a plurality of sampled positions of the movement distance and a plurality of corresponding scanning amplitudes of the signal intensity; a look-up table, representing a mapping relation between a plurality of amplitudes and these corresponding sampled positions; a position variation detection unit being coupled to the look-up table, and ascertaining the sampled position corresponding to a former scanning amplitude and a present scanning amplitude of these scanning amplitudes according to the look-up table for detecting whether the hand-held scanning system being under a position variation status or not when the hand-held scanning system being moved; and a scanning trigger generator, generating a trigger signal according to the position variation status to activate an image sensor of the hand-held scanning system for image scanning.