7results 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.

The embodiment of the invention relates to an optical scanner. The optical scanner comprises a polarizing beam splitter, a wave plate and an optical phased array chip. Wherein the polarizing beam splitter is used for dividing incident light source light into first laser with a first polarization state and non-working light with a second polarization state, reflecting the first laser and transmitting the non-working light, and the first polarization state is different from the second polarization state. The wave plate is located on the reflection light-emitting side of the polarizing beam splitter and used for receiving the first laser and emitting second laser with a third polarization state different from the first polarization state and the second polarization state. And the optical phased array chip is used for receiving the second laser and emitting reference light, and the optical phased array chip is also used for changing the emitting angle of the reference light. The embodiment of the invention further relates to a laser detection system with the optical scanner and an automatic driving vehicle applying the laser detection system.

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.

This invention discloses a method for manufacturing a dental scanner head and a dental scanner head manufactured by the method. The method for manufacturing a dental scanner head includes the following steps: manufacturing a dental scanner head by plastic injection molding; shielding a portion of the internal surface of the dental scanner head using a shielding member; controlling the position so that a sandblasting gun is located inside the dental scanner head shielded by the shielding member; and spraying abrasive from the sandblasting nozzle of the sandblasting gun onto the inner surface of the dental scanner head.

The utility model discloses a character identifying and scanning device, which relates to the technical field of character identifying and scanning, and comprises a working table, one side of the working table is fixedly connected with a mounting plate, the top of the mounting plate is fixedly connected with a supporting block, a positioning assembly is arranged above the working table, a lifting assembly is arranged above the supporting block, and the lifting assembly is fixedly connected with the working table. The beneficial effects of the utility model are that through the arrangement of the positioning assembly, the reset spring and the connecting block, the two sides of a text can be conveniently positioned, and the two sides of a book can be accurately positioned, so that all characters and image information on the book can be completely captured; according to the technical scheme, a user can find the optimal focal length position more easily, it is ensured that scanned images are clear, the phenomena of blurring and distortion caused by too small paper characters, pictures and symbols are avoided, and the scanning quality of the scanner is improved.

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.