5results about How to "Improve focus accuracy" patented technology

The utility model relates to the technical field of solar light and heat power generation discloses a solar heliostat. The solar heliostat includes: first sub mirror, the distribution of at least two second sub mirrors around the first sub mirror week side, support frame, stand and tracking mechanism, the axis of stand is perpendicular to ground, support frame is located at the top of stand, tracking mechanism is used for driving support frame action, first sub mirror and second sub mirror are located at the side of support frame away from the stand, first sub mirror and support frame fixed connection, every second sub mirror is connected with support frame rotation to the edge part of first sub mirror, the rotation axis of second sub mirror is perpendicular to the arrangement direction of itself and first sub mirror, and is parallel to the mirror surface of first sub mirror, and the part of second sub mirror away from first sub mirror is equipped with support part, and support frame is connected with support part through an adjusting part. The solar heliostat can realize the fast adjustment focal length, and the positioning accuracy is higher, and it is favorable for improving the focusing accuracy of heliostat.

This invention discloses an autofocus method, apparatus, electronic device, and storage medium, belonging to the field of autofocus technology. The autofocus method includes: adjusting the focal length within a first focusing range according to a first preset step size, acquiring a first image captured by the camera at each focal length, and determining an effective focusing area and a second focusing range based on the first image; adjusting the focal length within a second focusing range according to a second preset step size, acquiring a second image captured by the camera at each focal length, and determining the optimal focusing position based on the sharpness evaluation value of the effective focusing area in the second image; wherein the first preset step size is greater than the second preset step size. This invention performs focusing in two stages: the first stage uses a large step size to filter the effective focusing area and narrow the focusing range, and the second stage uses a small step size for focusing and uses fewer but more effective areas for focusing, thus achieving higher operating efficiency.

This invention discloses a method and apparatus for correcting motor offset. The method includes: obtaining the target travel position of the voice coil motor in the Z-axis direction; determining a target sub-interval from N travel sub-intervals based on the target travel position; dividing the travel range of the voice coil motor in the Z-axis direction into N travel sub-intervals, where N is an integer greater than 2; obtaining a first offset coefficient in the X-axis direction and a second offset coefficient in the Y-axis direction based on the endpoint positions and travel distance of the target sub-intervals; and obtaining a first correction position and a second correction position based on the target travel position, the first offset coefficient, the second offset coefficient, and the target sub-interval; the first correction position and the second correction position are the corrected travel positions of the voice coil motor in the X-axis and Y-axis directions, respectively. This invention can correct motor offset caused during the focusing process of a camera module, improving the focusing accuracy of the camera module.