52 results about "Exposure Elapsed Time" patented technology

The invention discloses a brightness calibration method, system and device based on an industrial camera. The brightness calibration method, system and device are used for determining the brightness of a shot object through camera shooting parameters. The method comprises the following steps: obtaining the exposure time and working distance of an industrial camera and the brightness of a standard integrating sphere light source; respectively determining a first relational expression, a second relational expression and a third relational expression corresponding to the influence of the exposure time, the working distance and the brightness of the standard integrating sphere light source on the average gray value of the image data through the control variables; and integrating the first relational expression, the second relational expression and the third relational expression to obtain a brightness conversion model.

The invention discloses an overlay measurement imaging brightness adjusting method and related equipment, and relates to the technical field of overlay measurement. Acquiring an initial image of an overlay mark area in the wafer according to the initial imaging parameters; and if detecting that the gray information of the overlay mark area in the initial image does not meet the preset condition, adjusting the initial camera exposure time to be the first camera exposure time according to the corresponding relationship between the camera exposure time and the gray information. And if the exposure time of the first camera meets the exposure condition, controlling the camera to collect an image of the overlay mark according to the exposure time of the first camera and the gear of the initial light source attenuation piece. According to the method and the device, parameter adjustment can be performed on each overlay mark in the wafer, the brightness of each overlay mark image is ensured to meet the requirement, and the measurement accuracy of each overlay mark is further improved.

The invention relates to an automatic exposure method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring multiple frames of to-be-processed images under different exposure time; the to-be-processed image comprises a plurality of pixel blocks; calculating the reflectivity of each pixel block by using the linear relationship between the gray value of each frame of the to-be-processed image and the exposure time; and calculating the expected exposure time of each pixel block under a preset target gray value based on the reflectivity of each pixel block. By adopting the method, the exposure time can be quickly and efficiently calculated.

The present invention discloses a method for controlling the automatic exposure function of a camera to a gray level setting. The method includes determining a critical exposure time of an image sensing device of the camera, where the critical exposure time of the image sensing device of the camera is the exposure time when a first sensed gray level of the image sensing device of the camera is configured to a target gray level, and the sensed gray level is configured in a decreasing trend of the sensed gray level value; exposing the image sensing device of the camera to obtain a second sensed gray level, and comparing the second sensed gray level of the critical exposure time with the target gray level. If the second sensed gray level is configured at least at the target gray level, the exposure of the image sensing device of the camera is limited to the critical exposure time.

Methods and devices for dynamically tuning an exposure time of an imager are disclosed herein. The method captures, via an imaging assembly of a device, a first image of an object. The imaging assembly comprises a light source and at least one imager having a first exposure time during capture of the first image. The method determines an average number of a first class of pixels per column of pixels present in the first image and determines whether the average number of the first class of pixels per column of pixels is within a range. If the average number of the first class of pixels per column of pixels is not within the range, the method modifies the first exposure time of the at least one imager by one of decreasing or increasing the first exposure time of the at least one imager based on a classification of the first image.

The invention discloses an imaging apparatus, a control method, a program, and a storage medium thereof. The image pickup apparatus includes: a detection unit configured to detect flicker in an image; a setting member configured to set an exposure time of the image sensor; a calculation unit configured to calculate an exposure time for suppressing flicker; and a control unit configured to cause the display unit to display an operation object representing at least a part of a range of exposure times that can be set by the setting member.

The invention relates to the technical field of telescope control, and particularly provides an automatic adjustment method and adjustment system for the exposure time of a medium-wave infrared camera of a telescope, and the method comprises the steps: comparing the maximum gray value of a target pixel region with a target optimal imaging gray value interval; and if the maximum gray value is higher than the upper limit of the target optimal imaging gray value interval or lower than the lower limit of the target optimal imaging gray value interval, carrying out exposure time adjustment in the usable exposure time set range of the medium-wave infrared camera, otherwise, not carrying out adjustment. According to the method, automatic exposure time adjustment is achieved, manual operation is reduced, the success rate of telescope target search is increased, more valuable data can be generated in the target observation process, and the stability of the closed-loop tracking process is guaranteed.

The invention discloses a method, a device and equipment for measuring a reflective object and a medium. The method comprises the following steps of: obtaining second exposure time of a camera according to a group of first deformed fringe patterns acquired by the camera and a time slice principle; according to a group of second deformed fringe patterns and a group of third deformed fringe patterns collected by the camera and a Fourier slice theorem, determining a receiving range of each pixel of the camera to the pixels of the projector; a single-pixel imaging technology is used for the second deformed fringe pattern and the third deformed fringe pattern to obtain a reconstructed light transfer coefficient; determining direct illumination points of pixels of the projector one by one according to the reconstructed light transfer coefficient and a depth constraint positioning method; and collecting all the direct illumination points to complete the reconstruction of the image of the reflective object. According to the exposure method, each image does not need to be exposed independently, and image details of a bright part and a dark part can be balanced at the same time, so that the types of exposure time are reduced, the image acquisition efficiency is improved, and meanwhile, three-dimensional shape reconstruction of a low-quality image under low illumination intensity is realized.

The present invention provides a parameter control method and an exposure method, the parameter control method comprising: obtaining substrate surface shape data and mask surface shape data before scanning exposure; obtaining a workpiece stage adjustment amount and an objective lens adjustment amount based on the substrate surface shape data and the mask surface shape data, and forming a workpiece stage motion trajectory and an objective lens motion trajectory; smoothing the objective lens motion trajectory to obtain a smoothed objective lens adjustment amount, so that the objective lens motion time is not greater than the workpiece stage motion time or the exposure gear switching time; forming a first coefficient based on the workpiece stage adjustment amount, and forming a second coefficient based on the smoothed objective lens adjustment amount. In this configuration, by optimizing the objective lens motion trajectory, the objective lens motion time is matched with the workpiece stage motion time or the exposure gear switching time, and the exposure time is no longer limited by the objective lens motion time, which effectively improves the yield of the exposure equipment, and also avoids the overexposure or underexposure phenomenon of the exposure field caused by the exposure gear adjustment, thereby improving the yield of the product.

An optical sensor, for sensing a sensing frame corresponding to a flicker period of ambient light, comprising: a pixel array, configured to perform N times of exposure operations via at least one pixel of the pixel array in N exposure time intervals to generate N sub-frames, wherein a summation of the N exposure time intervals equals to a sensing interval and the sensing interval is less than or identical to a first flicker period. The optical sensor adds the N sub-frames to generate a summing sub-frame. The sensing frame comprises the summing sub-frame. The adding operation can also be performed to digital signals generated from the sub-frames. The influences caused by the fluctuation of ambient light can be neutralized, since the frame or portion of the frame is sensed at least twice at different phases of a single flicked period. By this way, the conventional flicker issue can be improved.

The invention relates to a method for determining an exposure time (t) of a camera (1) of a camera system (10) for preferably moving and / or for machine object recognition in a moving scene, in which a predefined minimum angular image resolution (Ra *) is followed, comprising the following steps: a) determining an effective angular image resolution (Ra, eff (t)) as a function of the exposure time (t), b) the maximum allowable exposure time (tmax) is determined as the exposure time when the effective angle image resolution (Ra, eff (t)) is the value of the minimum angle image resolution (Ra *), and c) the exposure time (t) is set to a value less than or equal to the maximum allowable exposure time (tmax). The invention also relates to a camera system (10).

This facilitates the management of exposure conditions for materials displayed in the exhibition area. [Solution] The system includes an exposure amount calculation unit that determines the amount of exposure based on the exposure time and illuminance of the exhibition area where the exhibited items are displayed, determined by a lighting device, a determination unit that determines whether the amount of exposure has reached a threshold value which is lower than a reference exposure amount which is the upper limit of the amount of exposure for a specified period for the exhibited items displayed in the exhibition area, and an output unit that outputs an alert signal when the amount of exposure reaches the threshold.

Disclosed herein are a system, method, and computer program product embodiments for generating an exposure-adjusted frame based on local tone curve sampling. In some embodiments, a change in exposure times between a first frame captured by an image sensor and a second frame captured by an image sensor subsequent to the first frame may be determined. Different local tone curve resampling techniques may be performed based on whether the change is an increase or decrease in exposure times. Such techniques may resample local tone curves generated for the first frame to match the exposure time of the second frame. The resampled local tone curves, when applied to the second frame, mitigate various artifacts in the second frame, such as frame-to-frame flicker.

The application discloses a kind of automatic exposure control methods based on structured light stripe, comprising: S1, a group of four-step phase shift grating is collected, and is solved;S2, to modulation and background light are double down-sampling, eliminate oversaturated sampling value is sorted and is histogram;S3, find the modulation value and background light intensity value of the mark position on histogram;S4, according to step S3, the relationship between exposure time and background light is obtained, to find the most suitable exposure time of current frame;S5, the most suitable exposure time of current frame is compared with current frame exposure time, and output stable value;S6, set the most suitable exposure time of current frame, point cloud generation.The application solves the problem that exposure time is not adjusted for point value during camera exposure process, which leads to high or low exposure time, affecting measurement efficiency and quality.

To easily recognize the state of shutter speed adjustment by slider operation and reduce the labor required for adjustment.SOLUTION: An imaging device includes imaging means for capturing an image, detection means for detecting flicker from the image, display means for displaying information, setting means for setting an exposure time of the imaging means, calculation means for calculating an exposure time that suppresses flicker, and control means for causing the display means to display an operation object that displays at least a partial range of exposure times that can be set by the setting means, and when the exposure time calculated by the calculation means is within the display range of the operation object, the control means displays an indicator related to the calculated exposure time on the display means.SELECTED DRAWING: Figure 5

A method for determining an exposure time for a camera of a camera system that is moving and / or used in a moving scene for automatic object recognition, wherein a specified minimum angular image resolution is maintained. The method includes: determining an effective angular image resolution as a function of the exposure time; determining a maximum permissible exposure time as the exposure time with which the effective angular image resolution takes the value of the minimum angular image resolution; setting the exposure time to a value less than or equal to the maximum permissible exposure time. A camera system is also described.

The invention discloses an exposure time adjusting method, which relates to the technical field of image exposure, and comprises the following steps: setting exposure time, exposing a current image based on the exposure time, and carrying out histogram statistics on the exposed image to obtain a statistical result; respectively performing peak exposure calculation and mean exposure calculation based on the statistical result to obtain first adjustment time and second adjustment time; performing exposure weight calculation on the basis of the statistical result to obtain an adjustment weight, and performing weighted calculation on the first adjustment time and the second adjustment time on the basis of the adjustment weight to obtain pre-adjustment exposure time; and updating the exposure time based on the pre-adjusted exposure time, and exposing the next frame of image. The invention further discloses an exposure time adjusting device, computer equipment and a readable storage medium. According to the method, the exposure time is cooperatively adjusted through the peak value exposure algorithm and the mean value exposure algorithm in different scenes, so that the adjustment of the exposure time is more accurate.

A target position for calculating exposure time is automatically calculated and an appropriate exposure time is easily calculated. A system to do this includes: a camera that performs image capture of an image capture target range including a subject's eye to be observed by ophthalmic equipment; and exposure time calculation device for calculating an exposure time of the camera. The exposure time calculation device divides the image capture target range into areas of different brightness and calculates the exposure time in keeping with a brightness of an area specified by an operator.

The present application relates to the technical field of image processing, and specifically provides a kind of construction method of low signal-to-noise ratio spatial point source target data set, including obtaining scientific image, according to scientific image, establish signal-to-noise ratio-exposure time physical model to obtain the optimal exposure time corresponding to target signal-to-noise ratio, according to optimal exposure time, collect multiple frames of images to form multiple groups of acquisition sequences, each group of acquisition sequences includes two long exposure frames and a short exposure frame, according to target in long exposure frame, obtain the target label position of short exposure frame by label migration, create annotation mask with target label position as center, and based on the imaging characteristics of short exposure frame and target neighborhood, perform half-height full-width anomaly detection, ellipticity test, background stability test and star orbit crossing detection on generated sample, obtain sample with quality level, and then form data set.The present application method can improve the labeling accuracy, physical authenticity and data set reliability of low signal-to-noise ratio spatial point source target sample.

The present invention discloses an automated multi-reflective surface three-dimensional measurement method based on irradiance fusion. An exposure time selection network is used to generate a set of optimal exposure times and corresponding exposure times. There is no need to manually set the exposure time, which leads to redundancy in the captured images, thereby improving the automation and intelligence of the three-dimensional measurement process. A multiple irradiance fusion network is used to fuse the irradiance map sequences generated by all grayscale images to generate an irradiance map. On the one hand, this avoids directly using the grayscale map for phase calculation, and on the other hand, it reduces the error in the calculation using the irradiance map. At the same time, the multiple irradiance fusion network can feed back the irradiance map error value to the exposure time selection network for learning, thereby improving the accuracy of the phase calculation from the image perspective.

High dynamic range video frames may be generated from images captured using different exposure times. The merging of the images may combine pixel values of the images using a parametric exposure time ratio to form a merged video frame. The quality of the merged video frames may depend on the accuracy of the exposure time ratio. In some scenarios, the exposure time ratio is unknown, or reported information from an automatic exposure controller about the exposure time ratio is inaccurate. Using an inaccurate exposure time ratio to merge images will result in undesired artifacts in the merged video frames. To solve this problem, a self-calibration technique may be implemented to derive an exposure time ratio based on the image itself.

A method for controlling the time of a star sensor using a domestic rolling shutter exposure detector belongs to the technical field of star sensor control. To improve the accuracy of the star sensor, in the present invention, the exposure detector of the star sensor is selected as the domestic rolling shutter exposure detector GSENSE2020BSI; the design of the driving timing of the exposure detector and the time control method of the star sensor is implemented using an FPGA; the data update rate of the star sensor is set to 10 Hz, and the starting moment T0 of each frame is used as the starting point of the time slice of the exposure detector. The reset of 2048 rows of the exposure detector is sequentially performed within 68.8128 milliseconds; the exposure midpoint moment defined by the full-cycle exposure time is calculated; the rolling compensation of the star point coordinates is performed based on the exposure midpoint moment defined by the full-cycle exposure time. Under the uniform motion condition, the present invention can be improved by about 30%; under the uniformly accelerated variable motion condition, it is improved by about 77%; under the variably accelerated variable motion condition, it is improved by about 92%.

The invention provides an exposure system and a control method thereof, relates to the technical field of photoetching, and can perform real-time data calculation on exposure dose and exposure time by combining the exposure system and shutter control to obtain accurate data in a single opening and closing process of a shutter. Therefore, data errors caused by factors such as instability of an exposure system, temperature and pressure are reduced, and accurate control of exposure dose is realized.

Provided are an image processing device and a robot control device capable of determining an appropriate range of exposure times and number of shots for photographing a subject. The image processing device, which processes a captured image obtained by photographing the subject, comprises: a first exposure time determination unit that determines a minimum exposure time for photographing the subject; a second exposure time determination unit that determines a maximum exposure time for photographing the subject; a photographing condition determination unit that determines the exposure time and number of shots for photographing the subject based on an exposure time range that includes the determined minimum and maximum exposure times; and a composite image generation unit that generates a composite image by synthesizing a plurality of captured images obtained by photographing the subject using the determined exposure times and number of shots.

An exposure head includes a substrate on which light sources are mounted, and a condensing optical system. A memory stores a profile indicating correction gains for exposure amounts. A sensor detects a temperature. A processor acquires a correction gain that corresponds to a position of a light source that reached an exposure timing, corrects, for each of the light sources, an exposure amount of the light source with the correction gain corresponding to the position of the light source, and adjusts, for each of the light sources, a reference position of the corresponding correction gain in the profile in accordance with the temperature detected by the sensor.

According to one aspect, an indirect time-of-flight measurement sensor is proposed, comprising: - a photosensitive pixel array (PXM) configured to acquire a succession of images of a scene during a given exposure time, - a control unit (CU) configured to control the acquisition of a succession of images by the pixel array (PXM) and to define an exposure time for this acquisition based on the saturation level of the pixels of said array (PXM), the distances (z) between the sensor and elements of the scene, and a standard deviation (σz) of the distances between the sensor and the elements of the scene. Figure for the abstract: Figure 1

The invention relates to an exposure time control method, spectral imaging equipment and imaging equipment. The exposure time control method comprises the following steps: determining a predetermined frame period of imaging equipment; and setting exposure time offset of adjacent N + 1 frame images of an imaging chip of the imaging device to correspond to M times of the predetermined frame period, N and M being integers, and N being greater than or equal to M. Therefore, by controlling the exposure time offset between the adjacent frames based on the predetermined frame period of the imaging equipment, the problem of flicker of an imaging picture of the imaging equipment can be solved.

The invention discloses an aero-engine turbine blade temperature measurement method and system based on exposure control, and relates to the technical field of temperature measurement. The device comprises an experiment table, an experiment box body assembly, an imaging assembly and a high-frequency heating assembly, an experiment box body assembly and an imaging assembly are built at the top end of the experiment table, and the imaging assembly is arranged at one end of the imaging assembly; the experiment box body assembly comprises a black body box, an observation window and a clamping tool, and the inner side of the black body box is fixedly connected with the clamping tool. By controlling the exposure time of the camera and imaging of the CMOS camera and combining the preset exposure time of the camera, effective imaging of an experimental sample piece at different temperatures is achieved, specifically, measurement of a temperature field at an extreme temperature is achieved, the temperature measurement range is expanded, and limitation caused by sensor saturation is eliminated; the influence of emissivity in a traditional measurement method is eliminated; the continuity of the measurement process is ensured, and the camera can automatically switch the exposure time at different temperatures.

The invention provides an exposure time determination method, device and equipment, and the method comprises the steps: obtaining a calibration image collected based on an exposure time initial value; performing histogram statistics on gray values of pixel points in the target area in the calibration image to obtain a gray histogram of the target area; determining the current image contrast of the target area according to the gray histogram; and determining target exposure time according to a relationship between the exposure time initial value and the current image contrast and a set target image contrast. Therefore, modeling is carried out on the gray level distribution characteristics in the target area of the calibration image, the image contrast is determined, and the target exposure time is determined in combination with the relation between the exposure time and the contrast, so that the problems of large brightness value fluctuation and uncontrollable contrast in the exposure time determination process in the related technology are effectively avoided; the optimal exposure time suitable for the current scene can be quickly and stably determined, and then a clear target calibration image with good contrast is obtained.

The invention discloses an exposure time prediction method and related equipment, and the method comprises the steps: obtaining a second moment position of a camera according to a first moment position and speed of the camera, and calculating an average light measurement value of a laser point cloud subjected to color assignment processing in a target range of the second moment position, and obtaining a first predicted exposure time corresponding to the second moment position based on the average photometric value and the photometric parameter. And then obtaining a first adjustment value according to the laser point cloud which is not subjected to color assignment processing in the Bayer image, and determining the exposure time of a second moment position according to the exposure time corresponding to the first moment position, the first adjustment value, the first predicted exposure time and the color assignment processing proportion of the laser point cloud. According to the method, on one hand, more accurate exposure time prediction is carried out on laser point clouds subjected to color assignment processing and laser point clouds not subjected to color assignment processing, and the system construction quality is improved; on the other hand, the position and speed information is combined, and the prediction precision is improved by more accurately utilizing the environment information of the predicted exposure position.