73results about How to "Avoid out of focus" patented technology

The invention belongs to the technical field of laser cutting and particularly relates to a laser continuous cutting device having a dedusting function. The laser continuous cutting device comprises a dedusting mechanism and a laser cutting mechanism. The laser cutting mechanism comprises a laser head and a cushion seat module. The cushion seat module comprises a center shaft, a rotating roller and a fixed roller. The rotating roller and the fixed roller have the same radius, the fixed roller is connected with the rotating roller through the center shaft and is fixed relative to the center shaft, and the rotating roller can rotate relative to the center shaft. When a pole piece is cut, the pole piece adheres to the rotating roller by means of tension provided by mechanical transmission during the feeding, and a to-be-cut pole lug reserved area on the pole piece adheres to the fixed roller. The linear velocity of the rotating roller and the feeding speed of the pole piece are the same, so that no sliding friction occurs between the pole piece and the rotating roller, and the damage to the pole piece caused by the sliding friction between the pole piece and the rotating roller is avoided.

The invention provides a focusing system of a digital camera. The system comprises a receiving module, a focusing module, a judging module and a selection module, wherein the receiving module is used for receiving a focusing mode selected by a user; the focusing module is used for focusing when the user semi-presses a shutter according to the focusing mode selected by the user; the judging module is used for judging whether the focusing is successful; the selection module is used for automatically reselecting the most proper focusing mode when the focusing is failed; and the focusing module is also used for completing the focusing according to the selected most proper focusing mode when the focusing is failed. The invention also provides a method for focusing the digital camera. The focusing system can automatically and accurately select the most proper focusing mode for focusing under the condition that the user improperly selects the focusing mode.

The invention discloses a photographic device and a focusing compensation method. The photographic device comprises a sensor module, a motor control module, and a motor, wherein the sensor module is used for acquiring change value of acceleration of gravity of the photographic device, the motor control module is connected with the sensor module, and is used for acquiring the change value of acceleration of gravity from the sensor module, and judging whether the change value of the acceleration of gravity is greater than a default threshold value, if yes, the motor control module generates a control signal, the motor is connected with the motor control module, and the motor performs compensatory movement according to the control signal. Through adoption of the method, the photographic device is prevented from losing focus when holding gesture of a user changes, so that the experience effect of the user is improved.

The invention discloses a ballastless track slab temperature high speed dynamic measuring system. The ballastless track slab temperature high speed dynamic measuring system is used for measuring the temperature of a ballastless track slab; the ballastless track slab temperature high speed dynamic measuring system is mounted at the bottom of a train; and the ballastless track slab temperature highspeed dynamic measuring system comprises an optical information collection module, a photoelectric temperature measuring module and a temperature control box, wherein the optical information collection module is used for collecting spectral information of a sampling point of the ballastless track slab and transmitting the spectral information to the photoelectric temperature measuring module, thephotoelectric temperature measuring module is used for converting the spectral information into an electric signal and calculating the temperature of the sampling point according to the electric signal, and the temperature control box is used for adjusting the temperature of a working environment of the photoelectric temperature measuring module. According to the ballastless track slab temperaturehigh speed dynamic measuring system, with the train as a carrier, the temperature of the ballastless track slab of a railway line can be measured at a high speed in real time, and spatial sampling iscarried out at an equal interval of 250 mm to measure the temperature of the ballastless track slab under a double-direction (a forward direction and a reverse direction) running condition with trainspeed of 400 km / h in a high temperature or cold environment (a temperature range from a low temperature of -40 degrees to high temperature of 60 degrees).

The embodiment of the invention provides an automatic focusing method and device, and a mobile terminal. The method comprises: obtaining number of valid white spots in a focusing area corresponding todifferent focal lengths under a dark light and point light source environment, wherein pixel brightness values of the effective white spots are larger than or equal to a preset brightness threshold;and selecting a focal length corresponding to a focusing area with the least number of valid white spots in different focal lengths as a target focal length. Through adoption of the scheme, in a darklight environment, a focal length corresponding to a focusing area with the least number of valid white spots in different focal lengths as a target focal length, and a focal length corresponding to afocusing area with the least number of valid white spots is namely a spot focusing as clearly as possible, so that focusing accuracy is ensured, an out-of-focus phenomenon is avoided, and user shooting experience is improved.

The invention relates to a bellows of a rotating mirror framing camera, which comprises a bellows body and a rotating mirror, a relay lens array, an exit pupil diaphragm array and an image recording surface which are arranged in the bellows body. A secondary image I2 which is introduced from the outside of the bellows body is imaged on the rotating mirror and forms a final image on the image recording surface through the exit pupil diaphragms and the relay lenses after being mirrored by the rotating mirror; the image of an aperture diaphragm arranged on the bellows body is imaged on the exit pupil diaphragms through the rotating mirror; and the center of each exit pupil diaphragm is arranged on a cylindrical surface using a first Pascal helical line as an alignment line. By arranging the center of each exit pupil diaphragm on the cylindrical surface using the first Pascal helical line as the alignment line, constant scanning of the exit pupil diaphragm array is realized and the uniformity of the photographing frequency is ensured. The invention further discloses a technical scheme of respectively arranging the principal point of each relay lens in the relay lens array and the image recording surface on the cylindrical surfaces using a second Pascal helical line and a third Pascal helical line as alignment lines, thereby eliminating the theory error in the prior art and increasing the resolution of the camera.

The invention discloses an automatic pose adjustment method and device for a spherical optical element with a large curvature radius. According to the automatic posture adjustment method and device, ahigh-power microscope is utilized to collect a plurality of continuous dark-field gray-scale images focused to defocused correspondingly along four edge characteristic points with vertical and horizontal orthogonal diameters on the surface of the spherical optical element with the large curvature radius, an image Tenengrad operator value is calculated, the Tenengrad operator value and a high-power microscope axial movement curve are fitted, a positive focus position is searched according to an image Tenengrad operator extreme value criterion, and the spatial coordinates of each characteristicpoint are obtained; and by establishing a spatial mathematical model of the feature points and an adjusting device, the spatial coordinates of the four feature points are converted into pitch and spin two-dimensional adjustment amount to perform pose adjustment operations. The automatic posture adjustment method and device solve the defocusing problem caused by the non-parallel optical axis of the optical element and the optical axis of the microscope and the change of the rise height of the spherical optical element beyond the depth of field range of the microscope in the microscope full-aperture scanning detection process of the spherical optical element with large curvature radius.

The invention discloses a micro-impulse torsion device for differential measurement of laser interferometry, which solves the problems of low precision of torsion, defocus, and translation caused by impact force loading. Including the torsion part and the laser interference part; the torsion part includes a vertical frame, an upper cross bar and a lower cross bar, an oblique beam, a lifting adjustment mechanism and a translation adjustment mechanism; between the upper cross bar and the lower cross bar of the shaped frame The pendulum wire is suspended between the wires, and the middle part of the wire is fixed with a pendulum beam perpendicular to the wire. The vertical rod is fixed on the upper end of the inclined beam through the lifting adjustment mechanism. The lower end of the inclined beam is installed on the translation adjustment mechanism, and the translation adjustment mechanism is fixed on the test bench. ; The laser interference part includes beam expanders, reflectors, beam splitters, He-Ne lasers for generating interference beams, photodetectors and signal processing terminals. The measuring range of the device system of the invention is reasonable, the measurement accuracy is higher, the measurement process period is short, and the high-precision laser micro-pulse measurement is realized.

The invention discloses a projector intelligent focusing design method based on ultrasonic ranging. A DMD (Digital Micromirror Device) ray machine is internally provided with an MCU control chip, an ultrasonic ranging module and a focusing motor; one end of the focusing motor is connected with a focusing rod; through detecting a projection distance, the ultrasonic ranging module calculates and obtains the number of steps to be rotated by the focusing motor; and through controlling the motor driving chip, the MCU control chip enables the motor to drive the focusing rod on the DMD ray machine to rotate, and thus, focusing on the DMD ray machine can be completed. According to the projector intelligent focusing design method based on ultrasonic ranging, the cost needed for ultrasonic ranging is low, the system can avoid error operation caused due to vibration or object occlusion during the ranging process through a de-interference technology, the system adjusts the step size to be rotated by motor control through detecting the environment temperature in the case of work, a ray machine apparent focus problem caused by thermal expansion and contraction can be avoided, and the projection picture of the ray machine is kept distinct.

The invention discloses an image recognition method and device based on multiple focal lengths and a storage medium. The image recognition method comprises the steps of acquiring multiple sample images with different focal lengths; respectively carrying out target identification on each sample image to obtain identification information of each detection target in each sample image; and performingduplicate removal processing according to the identification information of each detection target in each sample image, and storing the detection targets after duplicate removal into a preset multi-focus image target set. According to the technical scheme, all detection targets can be effectively recognized without multi-focus reconstruction of the sample images, so that the accuracy of image recognition can be improved, the image processing speed can be increased, the time required for recognition can be shortened, and the practical performance of a medical detection device can be improved.

The embodiment of the invention discloses an automatic focusing method and apparatus for a mobile terminal and the mobile terminal. The method includes the steps of determining a first spot light source determining condition when a focusing event is triggered, and the current focusing area is detected to be in a preset scope on the periphery of a screen, wherein the first spot light source determining condition is less restrict than a second spot light source determining condition corresponding to the focusing area outside the preset scope on the periphery of the screen; determining whether the current shot objected is a spot light source according to the first spot light source determining condition, and executing corresponding focusing operation according to the determining result. When the technical scheme is adopted, the probability of mistakenly determining a spot light source as a non-spot light source is reduced. The scheme of the mobile terminal determining whether a shot object is a spot light source in an automatic focusing process is optimized, focusing accuracy is ensured, defocusing phenomenon is prevented, and the user experience is improved.

The invention provides pipeline inner wall three-dimensional acquisition equipment, which comprises a body and an impeller, wherein the body comprises a rotating device, and the rotating device is provided with an image acquisition port; an image acquisition port used for importing the images of the inner wall of the pipeline into the image acquisition device; an image acquisition device used foracquiring images of the inner wall of the pipeline; the advancing speed of the scanning equipment, the rotating angular speed of the rotating device and the field angle of the image acquisition device meet the following relation: (theta-beta) * v is smaller than m * R * sin beta * w, v is the advancing speed of the scanning equipment in the rotating process of the rotating device, R is the radiusof the pipeline, beta is the half field angle of the image collecting device, w is the rotating angular speed of the rotating device, theta is the included angle of the optical axes of every two adjacent cameras, and m is a coefficient. Three-dimensional acquisition equipment without extra power is proposed for the first time. In order to ensure the synthesis effect of subsequent three-dimensional images, the advancing speed of scanning equipment and the rotating speed of image acquisition are limited, and optimization is performed according to experience, so that the three-dimensional synthesis can give consideration to the speed and the effect at the same time.