The working principle of the answer card marking machine is as follows:
The light-emitting device light irradiation in the credit card information, such as information blacked out part of the light is absorbed and reflected light, or else the reflected light intensity, the intensity of light signals through the corresponding receiver tube is different from that of the electrical signals are transformed into electrical signals, and then through the A/D converter, digital filtering, pattern recognition after the completion of the credit card identification characters.
Expanded Information:
The use of cursor readers to input information, a real solution to the computer running fast, slow manual input speed "bottleneck" problem. Hundreds of times faster than manual keyboard input, especially for long hours of tireless work, can not be replaced by any other technology.
Applicable to a variety of signs, school registration management, classroom evaluation, professional qualification exams such as the Ministry of Labor, Ministry of Health medical personnel qualification exams, the Beijing Municipal Bureau of Statistics of the work of the security of the special operations, public **** the pilot test group of the car.
Bank of China, Agricultural Bank of China's new employees, Everbright Life Insurance Company's new employee entrance exams and midterm, midterm, final exams, etc., so that people from the tedious manual paperwork, greatly improving efficiency and reducing errors.
Baidu Encyclopedia - Marking Machine