Patent ID: 8619344

Claim:
A scanning method comprising: scanning first image data in a first direction at a scanning speed with a first photodetector, and storing the first image data in a register; decelerating the first photodetector to a stop position and scanning first position image data of a code strip with a second photodetector when the register is full; moving the first and second photodetectors in a second direction opposite the first direction by a distance that is greater than an acceleration distance required to accelerate the first photodetector from the stop position to the scanning speed; sensing that the register is cleared and accelerating the first photodetector in the first direction to the scanning speed and scanning second image data with the first photodetector, and scanning second image position data of the code strip with the second photodetector; comparing the second position image data of the code strip with the first position image data of the code strip to determine a joining point; and joining the first image data and the second image data at the joining point.