Method for digitizing barcode image by using dynamic threshold

A system for digitizing a barcode image, comprising:

• an image sensor configured to capture the barcode image;
• a memory configured to save sample data;
• an output device configured to output decoded data;
• and
• a processor coupled to the image sensor, the memory, and the output device and configured to process the barcode image;
• wherein after the barcode image is captured by the image sensor, the processor generates at least one sample line according to the barcode image, the processor acquires the sample data of the at least one sample line and saves the sample data to the memory, the processor generates a first reference line, the processor generates a second reference line according to the sample data, the processor generates an upper bound of the second reference line according to a difference between the first reference line and the second reference line and a first multiplier factor, the processor generates a lower bound of the second reference line according to the difference between the first reference line and the second reference line and a second multiplier factor, the processor generates a first curve by interpolating all sample points of the sample data, the processor generates a plurality of effective sample shapes of the first curve according to the upper bound and the lower bound of the second reference line, the processor identifies an internal point of each effective sample shape, the processor generates a second curve by interpolating all internal points, the processor digitizes the barcode image to binary data by comparing the sample data with the second curve, and the processor decodes the binary data and controls the output device to output the decoded data.