24 results about "Exposure Elapsed Time" patented technology

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.

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.

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.

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.

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.

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 a self-adaptive multi-exposure fusion three-dimensional measurement method for a high dynamic range scene. The method comprises the following steps: firstly, acquiring high-frequency phase shift fringe patterns at different exposure times, and finding out initial exposure time for preventing effective measurement areas in all phase shift patterns from overexposure through time domain light intensity overexposure detection operation; taking the high-frequency phase shift fringe pattern of the initial exposure time as an initial image of multi-exposure fusion, adaptively reserving a fringe region with high phase quality according to a modulation degree condition through a noise-modulation degree model, and introducing a time domain superposition principle to estimate the next exposure time of the multi-exposure fusion; and finally, calculating an effective measurement area of the current fused fringe image by using a reference plane phase based on depth constraint, and continuing to perform multi-exposure fusion until the effective measurement area meets a modulation degree condition, thereby completing three-dimensional measurement of the whole high dynamic range scene. According to the invention, the high-quality fringe pattern is obtained through adaptive multi-exposure fusion, the total exposure time is significantly reduced by introducing the time domain superposition technology, and high-precision and high-efficiency full-automatic three-dimensional measurement of a high-dynamic-range scene is realized.

1. Method for determining an optimal exposure time (texp,opt) of a time-of-flight camera for a given laser class, the time-of-flight camera operates according to a phase measurement principle and emits light in pulse groups, the first procedural block comprises the following steps: - Setting a start exposure time (texp,0) for the pulse groups, - Establishing at least one time reference point (ti) for each impulse group, - Determination of a limit value (GW) and accessible radiation (ZS) for the specified laser class at each support point (ti) within a specified time base, - Verification that a quotient of the limit value (GW(ti)) and the accessible radiation (ZS(ti)) corresponds to a desired safety margin (SM) within the specified time base, - If the quotient never reaches the desired safety margin (SM), a new exposure time (texp,k) is specified and the process steps are repeated. - If a quotient reaches the desired safety margin (SM), the current exposure time (texp,k) is output as the optimal exposure time (tepx,opt).

The application discloses a self-adaptive high-dynamic fusion method based on structure light stripe block, which comprises the following steps: S1, obtaining an automatic exposure time, projecting a four-step phase shift grating graph using the exposure time and calculating, calculating the median of the projection light intensity of left and right cameras; S2, calculating a ratio value, calculating each reference modulation value point and corresponding each reference exposure time; S3, comparing the number of the reference exposure time, if the number is greater than 1, continuing to execute the following steps, if the number is equal to 1, using the automatic exposure to project and calculate a complete grating group and directly outputting to the last step; S4, re-projecting using each reference exposure time and calculating each value; S5, performing a fusion operation on different modulation, background light and phase results; S6, calculating a reconstruction result and outputting. The application can realize automatic fusion, overcome a wide dynamic range and accurate imaging, overcome the phenomenon of inconsistent color of a map, vacancy of an overexposed area and the like.

The overall image acquisition method includes the following steps: providing a frame-based camera (10) with a field of view; storing images by an event-based camera (12) during the acquisition time interval (Δ). T, Texp A series of events generated during the acquisition interval, the event-based camera views the target scene within the field of view of the frame-based camera; motion in the target scene is estimated based on events stored during the acquisition interval (16); the exposure time is determined based on the estimated motion ( Texp ); and apply the exposure time to a frame-based camera (10) for capturing frames.

The invention relates to a method for determining an exposure time (t) for a camera (1) of a preferably moving and / or machine-based object recognition camera system (10) in a moving scene, wherein a predetermined minimum angular image resolution (R) a* ) is complied with, including the following steps: a) Determining an effective angular image resolution (R a,eff (t)) as a function of the exposure time (t), b) Determining a maximum permissible exposure time (t max ) as the exposure time at which the effective angular image resolution (R) a,eff (t)) the value of the minimum angular image resolution (R a* ) assumes, c) Setting the exposure time (t) to a value less than or equal to the maximum permissible exposure time (t) max ). The invention further relates to a camera system (10).

A photographing method, including: obtaining a preview stream; detecting a movement speed of a photographed subject according to the preview stream; obtaining a first exposure time by shortening, according to the movement speed, an initial exposure time for preview frames in the preview stream, in response to determining that the movement speed is higher than a preset speed threshold; and capturing a picture based on the first exposure time.

The invention relates to a method for processing images of the sky captured by an automated telescope. The main parameters are exposure time and gain. More specifically, the invention relates to the use of calibration images (dark images and bias images) to compensate for the defects introduced by the camera itself.

This invention provides a method, apparatus, and device for determining exposure time. The method includes: acquiring a calibration image based on an initial exposure time value; performing histogram statistics on the grayscale values ​​of pixels located within a target region in the calibration image to obtain a grayscale histogram of the target region; determining the current image contrast of the target region based on the grayscale histogram; and determining the target exposure time based on the relationship between the initial exposure time value and the current image contrast, as well as the set target image contrast. Therefore, by modeling the grayscale distribution characteristics within the target region of the calibration image to determine the image contrast, and combining the relationship between exposure time and contrast to determine the target exposure time, this effectively avoids the problems of large brightness fluctuations and uncontrollable contrast in the exposure time determination process of related technologies. It can quickly and stably determine the optimal exposure time suitable for the current scene, thereby obtaining a clear target calibration image with good contrast.

The present application belongs to the technical field of structured light three-dimensional measurement, and particularly relates to a structured light measurement camera exposure optimization and image quality evaluation method. First, the camera response function is solved for a pre-acquired image group to restore the true pixel value of the image group. In order to achieve a greater dynamic range under single exposure, the ideal pixel mean value is set, the optimal exposure time is solved through linear fitting of the corrected pixel value and the exposure time, and the optimal exposure time is used to collect the image of the measured object for quality evaluation. The image overexposure and underexposure evaluation parameters p1 and the image quality evaluation parameters p2 are calculated to obtain the image quality evaluation result P. In order to verify the effectiveness of the method, the experimental results show that when the measured object image is collected under different exposure times for model reconstruction, the number of matched points of the image collected under the optimal exposure time is obviously higher than that under other exposure times, and the key feature measurement result is accurate.

A method to determine an exposure time and / or intensity to be used for obtaining a desired feature of a relief structure, in particular a desired floor thickness, includes exposing a first side of a relief precursor with electromagnetic radiation, where the exposure is done in an area having a first position A and a second position B and is performed such that for a plurality of points between said first and second positions A, B the values for the exposure time and the exposure intensity are known, wherein the exposure time and / or the exposure intensity are automatically controlled to be varied at said plurality of points; determining one or more points of said plurality of points representative for the desired feature; and determining the required exposure time and / or exposure intensity for the desired feature based on the determined one or more points and the known values.

1. A method for determining the exposure time and / or intensity to be used to obtain desired features of a relief structure, in particular a desired floor thickness, comprising the steps of: exposing a first side of a relief precursor to electromagnetic radiation, wherein the exposure is carried out in an area having a first position A and a second position B, and wherein the exposure time and exposure intensity values ​​are known for a plurality of points between the first position A and the second position B, and the exposure time and / or exposure intensity are automatically controlled to vary at the plurality of points; determining one or more points from the plurality of points that represent the desired feature; and determining the required exposure time and / or exposure intensity for the desired feature based on the determined one or more points and the known values.