초록 ▼

A method of estimating the mid-points of elements of a bar code, wherein the code is illuminated, and the light diffused by the code is picked up to generate in response a signal having a substantially alternating waveform profile defined by high-amplitude zones alternating with low-amplitude zones;

A method of estimating the mid-points of elements of a bar code, wherein the code is illuminated, and the light diffused by the code is picked up to generate in response a signal having a substantially alternating waveform profile defined by high-amplitude zones alternating with low-amplitude zones; each high-amplitude zone corresponding to a space of the code, and each low-amplitude zone corresponding to a bar of the code. The signal is then quantized to obtain a discretized waveform having a number of local maximum and minimum points, and an observation window of a given width is defined by which to observe the waveform. The observation window is positioned on the maximum and minimum points of the discretized waveform to eliminate redundant maximum and minimum points within the observation window.

대표청구항 ▼

[ What is claimed is:] [1.] A method of estimating the mid-points of elements of a bar code, wherein said code is illuminated (17), and the light (R) diffused by said code (8) is picked up (20) to generate in response a signal (S(t)) having a substantially alternating discretized waveform profile co

[ What is claimed is:] [1.] A method of estimating the mid-points of elements of a bar code, wherein said code is illuminated (17), and the light (R) diffused by said code (8) is picked up (20) to generate in response a signal (S(t)) having a substantially alternating discretized waveform profile comprising high-amplitude zones alternating with low-amplitude zones; each high-amplitude zone corresponding to a space of the code (8), and each low-amplitude zone corresponding to a bar of the code (8);said discretized waveform (Sd(t)) having a number of local maximum and minimum points, the method comprising the steps of:defining (181) an observation window (F.sub.0) of a given width (A), by which to observe said discretized waveform; andpositioning (195) said observation window (F.sub.0) on said local maximum and minimum points of said discretized waveform to eliminate redundant maximum and minimum points.