11results about How to "Improve focus accuracy" patented technology

The present application provides a kind of forest tree species classification method, device, electronic equipment and storage medium, belong to artificial intelligence technical field, method includes: forest remote sensing image is input to forest tree species classification model, obtains the output tree species classification result;Forest tree species classification model includes preliminary feature processing module, high-order feature extraction module and tree species classification result output module, high-order feature extraction module is sequentially connected first residual block stack layer, first down-sampling layer, second residual block stack layer, second down-sampling layer, third residual block stack layer, third down-sampling layer and fourth residual block stack layer, stacked residual block embedding dimension rearrangement layer, dimension recovery layer and convolution block attention module.The present application improves the dimension compatibility of CBAM and convolution architecture by embedding explicit dimension rearrangement layer and dimension recovery layer in the residual block embedded with CBAM, effectively improves the classification accuracy of forest remote sensing image for forest tree species classification task.

The application belongs to the technical field of semiconductor lithography, and discloses a mask absorption layer structure with low three-dimensional effect, which comprises a quartz substrate, a bottom anti-reflection layer, an absorption layer main body and a top anti-reflection layer. The bottom anti-reflection layer is deposited on the surface of the quartz substrate. The absorption layer main body is deposited on the side of the bottom anti-reflection layer away from the quartz substrate. The top anti-reflection layer is deposited on the side of the absorption layer main body away from the bottom anti-reflection layer. The absorption layer main body forms a patterned groove structure required for lithography in the XY plane. The absorption layer main body is provided with a partition modulation structure matched with the diffraction characteristics of the patterned groove structure in the Z-axis direction perpendicular to the XY plane, which can adjust the light field distribution of incident light and the phase of transmitted light, eliminate multiple reflections and phase distortion in the groove, reduce the adverse effects of mask three-dimensional effect, improve the lithography focusing precision and pattern size control ability, and meet the lithography application requirements of advanced process nodes.

The utility model discloses a guide rail type focusing device, and relates to the technical field of guide rail type focusing. The guide rail type focusing device comprises a transmission gear, a fixing support, an image sensor and a stepping motor. The transmission gear is in sliding connection with the fixing support, the image sensor is arranged on the fixing support, a spring is further arranged between the image sensor and the fixing support, a driving gear is arranged at the output end of the stepping motor, and the driving gear is connected with the transmission gear in a meshed mode. According to the guide rail type focusing device provided by the utility model, the image sensor is arranged on the fixed bracket, and the fixed bracket performs lifting motion so as to achieve the purpose of focusing. In addition, a guide rail mode formed by the transmission gear and the fixing support enables a guide rail inclined groove and an inclined bone position to be in surface-to-surface contact so as to achieve the purposes of stability and zero clearance, assembly tolerance is reduced, focusing precision is improved, high-speed snapshot is achieved, meanwhile, the whole image is clear and balanced, and the problem that one side of the image is clear and the other side of the image is blurred is solved.

The invention discloses an automatic focusing method and device, and belongs to the field of high-precision measurement. The method comprises the steps of setting motion axis parameters, collecting a real-time image, calculating the blurring width of the image and calculating the focusing position. According to the method, the fuzzy edge width is directly calculated, the minimum fuzzy edge width is obtained, and the focusing precision is high. And the focusing height is locally solved, so that multi-height characteristic measurement is more accurate and is not easily influenced by noise. The repeatability is good, and the focusing height with stable image features can be obtained under the condition that the motion axis is not changed.

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.

The invention provides an ultra-wide-angle small automatic focusing lens and an image pickup device. The lens sequentially comprises a first lens group, an aperture diaphragm, a second lens group with positive focal power and a third lens group with positive focal power from an object side to an image side, in the focusing process, the second lens group moves from the image side to the object side along the optical axis; the lens satisfies the following conditional expressions: 1.5 < F2 / F < 3.5; 8 < F3 / F < 12; f / L is more than 0.05 and less than 0.3; f / H is more than 0.8 and less than 1.5. In the focusing process, only the second lens group moves along the optical axis, the positions of the first lens group and the third lens group are kept unchanged, the focusing mechanism can be simplified, miniaturization is facilitated, and meanwhile the focusing speed and precision can be improved. Furthermore, the aperture diaphragm is arranged on the side relatively close to the object, so that the design effect of considering both miniaturization and ultra-wide angle can be realized; the lens has a large target surface and can be matched with a half-frame camera.

The present application belongs to the field of autofocus technology of microscopic imaging, and relates to a focusing compensation system and method, comprising: an X-direction compensation module, used for adjusting the focusing light beam emitted by a focusing system in the X-direction, so that the focusing light beam is parallel incident to the sample surface after passing through the X-direction compensation and the microscopic imaging system, and is parallel reflected back to the microscopic imaging system, the focusing compensation system and the focusing system; a Y-direction compensation module, used for adjusting the focusing light beam emitted by the focusing system in the Y-direction, so that the focusing light beam is converged on the sample surface together with the working light beam of the microscopic imaging system after passing through the Y-direction compensation and the microscopic imaging system; the X-direction compensation module and the Y-direction compensation module are independently arranged. The present application adjusts the focusing light beam in the X-direction and the Y-direction through the focusing compensation system, and solves the problem that the working waveband of the existing microscopic imaging system is different from the focusing waveband, so that effective autofocus cannot be achieved.

The invention discloses a telecentric lens multi-parameter integrated detection method, which comprises the following steps of: after an initial position is manually confirmed, triggering automatic detection through a program, after automatic focusing, moving according to a set path and identifying an upper edge line, then moving rightwards along the line until an angular point 1 appears, then extracting contour features by using an OTSU method and identifying the position of the angular point; recording current coordinates after accurately moving to a corner point 1, starting to move downwards and identifying a right edge line, recording the current coordinates after moving to a corner point 2 along the line and moving to the corner point 2 in the same way, calculating theoretical coordinates of residual corner points according to the obtained accurate coordinates of the corner points and the actual size of the target image, and directly moving to the theoretical positions of the residual corner points; and identifying the position of the angular point and accurately moving the angular point, calculating the magnification, distortion and field curvature value of the lens according to the obtained coordinate data of the target point, and finally displaying the result in a computer equipment interface. According to the invention, the detection efficiency, the focusing precision and the detection stability are improved.