A scanner is a device that captures images. As a computer peripheral product with optical, mechanical and electrical integration, scanner is the third largest computer input device after mouse and keyboard. It can convert images into digital formats that computers can display, edit, store and output. It is a powerful input device.
Combine art graphics and photo scanning into documents, and scan printed text into word processing software to avoid the trouble of retyping. Scan fax files and input them into database software or word processing software for storage, and add images to multimedia products.
Working principle of scanner
The detected optical signal is converted into an electrical signal by the optical sensing device, and then the electrical signal is converted into a digital signal by the analog-to-digital converter and transmitted to the computer. The photoelectric conversion element is the photosensitive device and is the core of the scanner. Its photoelectric conversion characteristics, such as spectral correspondence, light stability, sensitivity and noise, are very important for image information transmission.
The main board of the scanner is mainly an integrated chip, and its function is to control the coordinated actions of all components, such as the movement of the stepping motor. The main function is to complete image data conversion and transmit digital information to the computer. Control the overall coordination of scanners and the overall work of data processing.