59 results about "Exposure Start Time" patented technology

A motion detecting part detects moving regions in a plurality of frame images captured by rolling shutter type exposure, and obtains a motion vector of the moving regions. A moving region correcting part corrects the moving region in a to-be-corrected frame image of the plurality of frame images on the basis of the motion vector, information on an image-capturing time interval between the plurality of frame images, information on an exposure starting time difference resulting from the difference in position in one frame image caused by the rolling shutter type exposure and information on an exposure start sequence depending on the position in one frame image captured by the rolling shutter type exposure.

According to the present invention, the imaging apparatus of the rolling shutter system first exposes / reads odd lines of an imaging sensor and then exposes / reads even lines. An image of one line is formed by sorting information of the lines, which is obtained by reading the information of the odd lines first and reading the information of the even lines later, in order of line positions. As a result, exposure start timing of adjacent odd / even lines is significantly shifted, and the exposure unevenness has a periodic stripe pattern when the exposure unevenness caused by flash emission of another person, etc. occurs on an image of one frame. Therefore, accurate detection of exposure unevenness caused by flash emission of another person in an imaging apparatus of a rolling shutter system can be achieved.

An image display method and a device to secure high quality of image are provided. The image display apparatus includes a photo sensitive module having a plurality of sub sensing areas corresponding to a plurality of lens areas, an exposure control module to set exposure starting times of the sub sensing areas to be different from each other, an intermediate image to produce module interpolating a plurality of original images captured by the sub sensing areas to produce a plurality of intermediate images that correspond to the original images, and a final image to produce module rearranging the intermediate images according to the order of the original image to produce final images.

The invention discloses a multi-camera head-end control method and device, which solve the problems that when images collected by a camera array are used for splicing, the image luminance of each camera is inconsistent, and the edges of the images to be spliced have faults and splicing gaps while moving objects exist in the images, therefore the effects of spliced images are improved. In the embodiment of the invention, a camera head-end global control unit is additionally arranged the traditional scheme, image luminance information of each camera at the front end after exposure is collected, the exposing parameter of each camera is obtained by an exposure algorithm, and the exposure starting time of the camera array is synthesized. The embodiment of the invention is mainly used for collecting images of different areas by a plurality of cameras in the camera array and generating a big scene picture by splicing.

A photo sensor array is divided up into multiple blocks that are operated with different exposure times. A prediction algorithm is used to predict the overall light brightness of each block and determine the exposure time of each block. Each block may also include memory to store the exposure time for the pixels in the block as well as analog-to-digital resolution for the block.

The invention relates to an exposure time, frame rate and smear test device and a test method. The test device and the method use a brightness adjusting mechanism to adjust brightness of a target plate. A rotation power component drives the target plate to rotate uniformly as a preset angular velocity. A tested image acquisition system carries out photographing and recording on the target plate. The target plate is provided with a distinguished pattern. Through a pattern angle and position changes, a single frame rotation angle and the preset angular velocity of the known target plate are acquired. And then, exposure time of the image acquisition system is calculated. A rotation angle between two adjacent frame corresponding points in a video and the preset angular velocity are used to calculate a frame rate of the image acquisition system. Deflection of a pattern in a photograph is used to calculate a length of a smear generated by the image acquisition system. By using the test device and the method, a defect that the exposure time of the tested image acquisition system is difficult to adjust is overcome; in a highlight environment, the test can still be performed.

A radiation image capturing system is provided. A radiation source control device includes a first timing component, and a control component that, when a time of the first timing component has reached a pre-specified exposure start time, controls a radiation source, which emits radiation, and performs control to cause radiation to be irradiated for a predetermined duration from the radiation source. A radiation image capturing device includes a second timing component that measures time, which is synchronized with the first timing component, a sensor portion that generates charges in accordance with irradiation of radiation and that is irradiated with the radiation from the radiation source, and a generation component that, after a time of the second timing component has passed through the predetermined duration from the exposure start time, reads out the charges generated at the sensor portion and generates image data representing a radiation image.

The invention relates to an automatic exposure method based on histogram equalization, which includes steps of acquiring a frame image, recording exposure time of a frame, computing average value of the brightness of the acquired frame image, performing histogram equalization on the acquired frame image, computing average value of gray level of the image after the histogram equalization, computing exposure time of the next frame according to the principle that the exposure time is in direct proportion to the average value of the brightness of the image, setting exposure adjustment tolerance and the like. By the aid of the automatic exposure method, the technical problems of insufficient exposure or overexposure of a pickup body in the prior art are solved, the average value of the gray level of the image after histogram equalization is used as the optimum average value which can reflect characteristics of the brightness of the image sufficiently and is dynamic and can be suitable for environments with various brightness.

An image capturing apparatus and a method of operating the same are provided. The image capturing apparatus includes: an imaging device configured to obtain, based on a previously set exposure condition, an imaging signal that corresponds to at least one frame; a flicker information determining circuitry configured to determine flicker information of a light source using the imaging signal that corresponds to the at least one frame; and a controller configured to control, based on the flicker information of the light source, an exposure start time of the imaging device in order to take into account flicker occurrence due to the light source.

A tandem-type image forming device is provided which includes a plurality of photosensitive drums, a paper edge detecting section to detect a front edge and a rear edge of a sheet of paper, an exposure starting time calculating unit for each of a plurality of photosensitive drums, an exposure inhibiting time calculating unit to inhibit printing, when paper having a length being smaller than a predetermined length of the paper is inserted, on a portion being shorter than preset paper, and a control section to control an entire image forming device. By configuring as above, the tandem-type image forming device can be realized by using only one paper edge detecting sensor and only one detecting circuit. Even when paper having a length being smaller than a preset length of the paper is inserted, no transfer of an image to a place outside of the paper, that is, to a carrying belt occurs.

The invention discloses a minimum bracketing exposure set acquisition method based on optimal exposure. A technical problem that a high-dynamic range image synthesized by using the existing minimum bracketing exposure acquisition method is bad in imaging quality is solved. The technical scheme is follows: orderly acquiring irradiance ranges under different exposures by adopting a Debevec&Malik camera response function acquisition method, establishing a relevant exposure corresponding relation between the target scene optimal exposure and the camera captive exposure, and traversing the camera standard exposure sequences to obtain the minimum bracketing exposure image set corresponding to the target scene in the camera standard exposure sequence; computing the minimum bracketing exposure image set based on the target scene optimal exposure according to the exposure step difference by the optimal exposure time of the target scene, wherein the obtained exposure set comprises the optimal exposure containing most available information of the target scene. The image quality is guaranteed, and the redundancy time in the exposure time and the total consumed time for capturing image set are effectively reduced.

The invention discloses an interference exposure system which is used for exposing a substrate coated with photoresist. According to the system, incident light is divided into at least two light beams through a beam-splitting device, and at least two interference arms are correspondingly formed; each interference arm is provided with a shutter for controlling whether the interference arm is involved in exposure and the exposure time; at least one interference arm is provided with a phase compensator used for changing the beam phase of the interference arm. The interference exposure method comprises the following steps of: providing a substrate, and coating photoresist on the surface of the substrate; providing incident light, dividing the incident light into two light beams, and correspondingly forming two interference arms; adjusting the beam phase of one interference arm in the two interference arms, so that the beam phase of the interference arm is changed by 180 degrees*N, and N is an integer; performing repeated exposure on the photoresist on the substrate by utilizing the two interference arms, rotating the substrate, and forming multiple groups of interference patterns of which interference fringes are superposed on the photoresist on the substrate. The interference exposure system has the advantages that holes and columnar patterns can be flexibly formed on the positive and negative photoresists.

The invention discloses an exposure time adjusting method for earth observation frame transfer area array CCD image motion matching and relates to a frame transfer area array CCD exposure time adjusting method for solving the problem that when the exposure time is too short, the signal to noise ratio is too low, and when the exposure time exceeds one equivalent line period, obvious image blurringoccurs, so that the dynamic transfer function declines along the orbit direction in the existing earth observation imaging application. The method comprises the steps of (1) light-sensitive area useless charge frame transfer phase; (2) controllable-time image motion matching exposure phase; (3) light-sensitive area useful charge frame transfer and original storage area same-line useless charge dumping phase; (4) storage area residual useless charge and light-sensitive area transition-line charge dumping phase; and (5) storage area useful charge frame reading phase. According to the method, theinterval of two times of frame transfer in the light-sensitive area is changed to control the exposure time, a mechanical shutter is not needed, and the original hardware circuit is not modified; andin addition, the image blurring problem under long exposure time is effectively solved.

The invention provides a method of controlling flashing time of an external flash lamp. The method comprises steps of detecting a specific event, wherein the occurrence time of the specific event has a fixed time span relative to the exposure starting time of a first row of photosensitive elements; determining whether a single flashing period exists or not, wherein flashes in the period can be received by each row of photosensitive elements; when the single flashing period exists, carrying out single flashing after a delayed period after occurrence of the specific event; and when the single flashing period does not exist, carrying out first flashing after a delayed period after occurrence of the specific event, and carrying out second flashing after a period after the first flashing.

A method for artifact elimination is disclose in an embodiment of that present application, The method comprises the following steps: when acquiring a long-exposure image is detected, acquiring a first short-exposure image through a second camera according to an exposure start time of the long-exposure image, acquiring a second short-exposure image through the second camera according to an exposure stop time of the long-exposure image; determining displacement information based on the first short exposure image and the second short exposure image; according to the displacement information, determiningan artifact region of the long exposure image, and reparing the artifact region, so as to improve the resource utilization rate of the equipment.

The invention relates to an exposure controller in a printing industry and a PCB (Printed Circuit Board) manufacturing industry. A digital ultraviolet exposure controller based on a single chip technology comprises an ultraviolet sensor and a single chip, wherein the ultraviolet sensor is mounted in an exposure box; an output signal of the ultraviolet sensor is switched into the single chip through an analog / digital converter; an exposure time setting switch, an exposure control switch and a display module are all connected with the single chip; the single chip is connected with an ultraviolet iodin gallium lamp through a driving control circuit; an input end of the driving control circuit is in controlled connection with the single chip; and a control switch of the driving control circuit is connected with a power circuit of the ultraviolet iodin gallium lamp. In the digital ultraviolet exposure controller, the ultraviolet sensor is utilized to detect the illumination of ultraviolet rays in real time and the single chip is used for calculating the exposure time of the illumination, so that the purpose of accurately controlling the exposure is achieved, the digitalization of the exposure is realized and the exposure of the PCB is more accurate.

An endoscope system comprises: a light source unit which generates first and second narrowband lights simultaneously or alternately; a color filter in which first and second filters having different spectral properties are arranged; an imaging element which receives light that passes through the first filter with a first pixel group, receives light that passes through the second filter with a second pixel group, and is capable of setting an exposure time and an electrical signal read time for each pixel; and a control unit which, when generating first and second narrowband lights alternately from the light source unit, synchronizes in a first period the generating time of the first narrowband light, the exposure time of the first pixel group, and the read time of the second pixel group and synchronizes in a second period the generating time of the second narrowband light, the exposure time of the second pixel group, and the read time of the first pixel group.

To improve the image quality in an imaging apparatus. A synchronization signal generator generates a synchronization signal indicating a synchronization timing for each of synchronization intervals. A synchronization interval controller changes, when an amount of change of the synchronization interval is input, the synchronization interval according to the amount of change. An imaging element generates image data by performing exposure within an exposure period between an exposure start timing when a start-setting time has elapsed from the synchronization timing and an exposure end timing when an end-setting time has elapsed from the synchronization timing after the exposure start timing. An exposure controller changes, when the amount of change is input, at least one of the start-setting time and the end-setting time on the basis of the amount of change.

The invention discloses an embedded vehicular camera exposure time dynamic adjustment method. The method comprises the steps of calibrating and initializing a vehicular camera; carrying out computingand obtaining exposure information of a first frame of image; obtaining exposure time of a second frame of image according to the exposure information of the first frame of image; carrying out computing and obtaining the exposure information of the second frame of image; and obtaining the exposure time of a next frame of image according to the exposure information of the previous two frames of images. The embedded vehicular camera exposure time dynamic adjustment method provided by the invention has very high adaptability, efficiency, timeliness and stability.

The invention discloses an electronic shutter for an ultraviolet LED (Light Emitting Diode) exposure machine. The electronic shutter is characterized by comprising an exposure intensity setting module, an exposure time setting module, a light intensity and temperature detection module, a center control module, a light intensity adjusting module and an upper computer communication module. According to the electronic shutter, the intensity of light sent by an exposure light source is adjusted in real time by detecting the light intensity and temperature, feeding back the light intensity and temperature and adjusting the light intensity, so that the intensity of the light sent by the exposure light source is extremely stable, and the rate of finished products and the product quality of machined workpieces are improved. The electronic shutter is used for taking the place of a mechanical shutter, so that the switch time of the exposure light source is shortened, the exposure amount is controlled more accurately on the aspect of time, and the bottle neck that the service life of the mechanical shutter is limited is also broken through.