3 results about "Duplex scanning" patented technology

This application relates to the field of scanner image acquisition technology, and in particular to a method and apparatus for dynamic compensation of exposure time of a reverse-side CIS sensor. The method is applied to a duplex automatic document feeder scanning system, which is equipped with independent CIS sensors for the front and back sides to achieve synchronous scanning of the front and back sides. The method includes: upon receiving a duplex scanning task instruction initiated by a user, obtaining the current relative luminous intensity of the reverse-side CIS sensor LED based on the current cumulative illumination time of the LED and a pre-stored attenuation curve model of the reverse-side CIS sensor LED; obtaining the compensated exposure time based on the current relative luminous intensity and pre-stored initial parameters of the reverse-side CIS sensor; and controlling the reverse-side CIS sensor LED to illuminate according to the compensated exposure time, thereby achieving exposure compensation and image quality maintenance of the reverse-side image during duplex scanning.

The utility model relates to the technical field of surveying and mapping file informatization, in particular to a surveying and mapping file informatization scanning device which comprises a base, a mounting frame is fixedly connected to the upper surface of the base, and two high-speed shooting instruments are installed on the upper surface and the lower surface of the inner wall of the mounting frame respectively. A placement plate is rotatably connected to the left side face of the inner wall of the mounting frame, a power box a is mounted on the left side face of the mounting frame, surveying and mapping files needing informatization scanning are stacked and placed in the placement box, a servo motor b drives a worm b and a worm gear b to rotate, and the worm gear b rotates to drive a connecting column, an adjusting frame and a vacuum suction cup to conduct angle adjustment. The air cylinder drives the vacuum suction cup to move downwards, surveying and mapping files are adsorbed through the vacuum suction cup, the orientation adjusting assembly conducts angle adjustment on the vacuum suction cup and the surveying and mapping files, the surveying and mapping files are placed on the upper surface of the placing plate, double-face scanning is conducted on the surveying and mapping files, and the problems that according to an existing device, the workload of operators is large, and the needed waiting time is long are solved.

The utility model relates to the technical field of printers, in particular to a laser imaging scanning unit of a printer, which comprises a mounting frame, the mounting frame is of a U-shaped structure, an upper scanning head is fixed at the upper end of the mounting frame through a support, a turnover mechanism is arranged below the upper scanning head, and the turnover mechanism comprises a bearing, a first shaft rod, a motor and a lower scanning head. The bearing is fixedly embedded into one side of the mounting frame, and the inner ring wall of the bearing is in interference fit with a first shaft rod. The turnover mechanism is controlled by the servo motor to realize 180-degree forward and reverse rotation of the lower scanning head, the scanning end is powered off downwards when not in use, double-sided scanning is supported, a single-sided mode can be switched, the equipment applicability is improved, idle loss of the lower scanning head is avoided, and the service life is prolonged; a copper alloy conductive block contact power-on design is adopted, an overturning power-off mechanism is matched to reduce energy consumption, a built-in sponge brush automatically cleans dust on the surface of a contact during power off, power-on stability is ensured, meanwhile, the contact is covered for dust prevention, and maintenance frequency is reduced.