4results about How to "Improve scan quality" 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.

This utility model discloses a 3D scanner with replaceable filters, comprising: an instrument body; a camera unit and a laser projection unit disposed within the instrument body, wherein the camera in the camera unit and the projection surface in the laser projection unit are both disposed on the measurement surface of the instrument body; and a supplementary lighting unit located around the camera and disposed on the measurement surface, wherein the filter unit in the supplementary lighting unit is detachably disposed at the front end of the light source assembly in the supplementary lighting unit. This utility model significantly improves the scanner's adaptability to different material surfaces and scanning quality through the design of replaceable filter units, optimizes image clarity and detail, and allows for flexible adjustment and rapid replacement of filters according to the characteristics of different materials.

The application discloses a human resource paper file digitization scanning and collecting device and relates to the technical field of document scanning.The device comprises a bottom plate and a plurality of first supports, an automatic paper discharging device is fixedly arranged on the first supports, a second support is oppositely arranged on the right side of a lower paper guide plate, a first electric push rod is fixedly arranged on the top of the bottom plate outside the second support, a base is fixedly arranged on the output shaft of the first electric push rod, a limiting groove is formed in the second support, a first rotating shaft is arranged in the limiting groove and penetrates through the base, a rotating plate is fixedly arranged on the first rotating shaft, a foam layer is fixedly arranged above the rotating plate, and a limiting mechanism is embedded and arranged on the rotating plate and the foam layer.The paper file scanned by the automatic paper discharging device is fed to the rotating plate through the upper paper guide plate, the limiting mechanism limits the paper file, and the foam layer serves as a background, so that the subsequent mechanism can collect the paper file.

The invention relates to the technical field of direct-current brushless motor driving control, in particular to a direct-current brushless motor self-adaptive driving method and system for laser radar scanning. According to the method, the feedforward compensation amount of the direct current brushless motor is calculated based on an obtained total load disturbance observation value acting on the direct current brushless motor and an obtained environment interference factor in scene feature information from laser radar point cloud data. Scene features can be extracted in real time according to point cloud data, scanning modes are intelligently switched, the laser radar scanning efficiency and the point cloud quality are improved, and closed-loop cooperation of laser radar sensing and motor driving is achieved; meanwhile, load disturbance is estimated and compensated in real time based on the extended state observer, the robustness of the system is enhanced, and high-precision tracking of the rotating speed of the motor is achieved.