87 results about "Pre-flashing" patented technology

An auto-exposure algorithm for controlling a camera flash uses image processing to identify important areas of the image affected by the flash, while disregarding highly reflective / illuminated areas and uses a ND filter to linearize the flash triggering with highly reflective scenes. The camera flash is controlled by the auto-exposure algorithm in two stages:a pre-flash stage followed by a main-flash stage. In the pre-flash stage, two images are captured under the same camera settings regarding the exposure time, gain, iris and resolution. One image is captured with flash and one without. From the difference between the two images, a reference pixel is used to determine the flash intensity in the main-flash stage.

An adjusting method of flash intensity is applied in an image capture apparatus with a flash lamp, where two pre-flash images corresponding the object are retrieved under two different pre-flash lights, respectively, and then a flash intensity of main-flash light is calculated according to one of the retrieved pre-flash images, so as to retrieve a main-flash image corresponding the object under the main-flash light with the calculated main-flash light.

Various methods, apparatuses, and systems in which a digital photography device includes a global shutter to control exposure time, a sensor array, and a flash illumination are described. The global shutter is in the optical path of light going to the sensor. The flash illumination generates a pulsed illumination. The shutter speed of the global shutter during a pre-flash illumination substantially matches the shutter speed during the flash illumination during the taking of a picture using the flash illumination based on the global shutter receiving a trigger signal from a controller.

An image sensing method and image sensing apparatus, including a subject detection unit and a flash unit, are provided. The method includes a first detection step of detecting a subject from image data obtained during preparation for main image sensing, a second detection step of detecting a subject based on reflected light data obtained during pre-flash after an instruction to begin main image sensing, a step of setting a flash illumination area based on a comparison result between a first proportion of the subject detected in the first detection step within a subject area in which the subject exists and a second proportion of the subject detected in the second detection step within the subject area, a step of calculating a flash illumination amount based on the set flash illumination area, and a step of controlling the flash unit during main image sensing based on the calculated flash illumination amount.

The invention discloses a method for producing an axle beam by using preheated flash butt welding, which comprises the following steps of: a workpiece clamping step, wherein an axle head and an axle pipe which are used as workpieces are respectively arranged in a shaft beam flash butt welding machine, are clamped by a hydraulic moving clamp and a fixed clamp, and align through an adjustment mechanism; a pre flash step, wherein a power supply is powered on, so that a moving clamp is pushed at a set constant speed, and further, flash can be generated between the workpieces and gradually shortens until the flash margin reaches a preset value; a preheating step, wherein the workpieces are preheated by preset preheated pulses; a flash step, wherein flash is carried out at set speed; an upsetting step, wherein upsetting is carried out immediately after flash; a heating and pressurizing step, wherein the workpieces are applied with preset pressure and are powered on to be heated; and workpiece disassembling step, wherein after welding, the workpieces are disassembled and taken out.

A method for controlling a flash of an electronic device by detecting an illumination intensity and a color temperature of a current environment from a RGB sensor. When the illumination intensity is lower than a first predetermined value, a pre-flash of the flash is turned on. Control a color temperature of the pre-flash to be equal to the color temperature when the color temperature is lower than a second predetermined value. A distance between a target object and the camera is obtained, adjusting the current of the high color temperature LED and the current of the low color temperature LED simultaneously according to the obtained distance after turning on a main-flash of the flash to capture an image of the target object.

The invention provides a photography method and system. Firstly, a first sensing image data is obtained from a surrounding light source. And then, a pre-flash is carried out by a flashlight, and a second sensing image data is obtained from the pre-flash of the flashlight. When a photography is operated, a white balance correction is carried out for each pixel in the sensing image according to the first sensing image data and the second sensing image data.

A camera system with function of automatically coordinating flash intensity includes a lens, an image sensor, a focus system, a focus sensor and a control unit. The lens is capable of controlling light amount that entrance into camera. The focusing system is capable of driving the lens to focus thereby forming a clear image on the image sensor. The focus sensor is capable of sensing first step information of the focusing system during the focusing process, and sending the information to a control unit. The control unit is capable of transforming the result of the focusing system to a distance that the object apart from the camera, and configures out the guide number with the aperture number thereby calculating the flash intensity. The present camera systems without neither a professional measurement tool nor an additional pre-flash may measure the distance that the objects apart from the camera, and low down the cost and power consumption. The camera systems may also precisely control the flash intensity thereby coordinating the exposure effect.

For an image pickup device formed from a plurality of pixels, each of which can perform any of an exposure operation and a reading operation thereof at a timing different from that of the other, an imaging apparatus is provided, which can determine the amount of main-flashing light based on pre-flashing by a flash highly accurately.Before and during a preflash operation by the flash 21, an exposure operation is started simultaneously for all the pixels of the image pickup device 13 to form an image before and during the preflash to obtain a detected value by the detector circuit 17 before and during the preflash, respectively. The computation circuit 18 computes a differential detected value obtained by subtracting the before-preflash detected value from the during-preflash detected value. The differential detected value is a detected value containing only pre-flashed light with ambient light excluded. An amount of light for main flashing is computed on the basis of the differential detected value.

A flash accessory device readily adaptable to most compact digital camera models provides a hand grip with a mounting base for attachment to the bottom of a compact digital camera. The hand grip contains a multi-mode digital pre-flash detector circuit, a wireless transmitter and a battery power source. An articulating arm extends from the hand grip and is adjustably movable relative to the front of the camera in order to position a sensor on the end of the articulating arm directly in front of the camera's built-in flash. A cup member surrounding the sensor covers the built-in flash to block light emitted by the built-in flash. Light from the built-in flash is detected by the sensor which triggers transmission of a wireless signal from the transmitter to a receiver in a remote flash device to thereby activate illumination of the remote flash in synchronization with activation of the built-in camera flash.

An intelligent flash system for a digital camera having components including an image optical pickup, an interface circuit, a flash unit and a processor. Upon activation of the camera, ambient lighting conditions are evaluated and if flash energy is required, a first low energy pre-flash is radiated, the reflected light received by the optical pickup having a multiplicity of pixels, and the output of the pixels converted to image intensity data by the interface circuit. The processor samples the image intensity data, weighing the center image area more heavily, and creates a histogram plot of quantity of pixels v.s. intensity, and separates the plot into a bar graph from which a determination of exposure is obtained. The histogram is then used to calculate a multiplicative scaling factor used to multiply the first flash energy to an estimate of a flash energy for correct exposure. Conditions of extreme over and under exposure result in the activation of a second flash at an adjusted energy level. The image data of the second flash is then analyzed and the exposure compared with the result of the first flash. A final determination of flash energy is then made based upon the results.

An imaging apparatus includes an image sensor configured to image an object to generate image data, a flash control unit configured to control a main flash, to be performed by a flash unit configured to emit flash to an object, according to preliminary image data generated by the image sensor in association with a pre-flash performed by the flash unit, a first drive unit configured to adjust starting timings of exposures performed at a plurality of lines of the image sensor to a same timing when the pre-flash is performed, and a second drive unit configured to shield the image sensor from light before the preliminary image data is read from the image sensor.

The invention relates to a camera device. The camera device comprises a flasher, a sensing module, a brightness processing module and a brightness compensation module. The flasher is used for laser pre-flashing and main flashing. The sensing module is used for sensing the image information which is fed back after the pre-flashing of the flasher. The brightness processing module is provided with a preset brightness value. The brightness processing module can divide the image information sensed by the sensing module into a high brightness block and a low brightness block, calculate the brightness difference between the average brightness value of the high brightness block and the average brightness value of the low brightness block, compare the brightness difference with the preset brightness value, and judge whether the image information has the depth of field and judge the degree of the depth of field according to the comparison result. If the brightness processing module judges that the image information has the depth of field, the brightness compensation module corrects the main flashing intensity and photosensitivity of a field depth degree correcting flashing device according to the degree of the depth of field judged by the brightness processing module. In addition, the invention also relates to a camera method.

The invention provides a flash light device, which includes a light source, a light diffuser and a light diffuser's driving unit. The light diffuser's driving unit provides the light diffuser with a required driving voltage according to a voltage information, in which the voltage information is determined according to an original image without light-complementing of the light source and a pre-flash image with light-complementing of the light source.

A method for adjusting photosensitiveness is able to determine a relative distance of an object in an image capture area through images captured before and after pre-flash of a flash lamp, so that the relative distance serves as a reference for adjusting current photosensitiveness of the digital camera, thereby capturing an image having better quality in a status that the flash lamp provides a fill light.

Image capture methods and systems. First image data with an environmental light source is captured, and second image data with a pre-flash light source of a strobe is captured. During image capture, each pixel therein is respectively performed with a white balance adjustment according to the first and the second image data.

A light emission control system for a flash device includes a plurality of photometering sensors for photometric measurements on different photometering zones; and a controller which outputs a periodic pulsed trigger signal for activating the flash device, and sequentially selects analog signals output from the plurality of photometering sensors to convert the analog signals into digital signals in sequence. The controller outputs the pulsed trigger signal having a predetermined pulse frequency to perform a pre-flash emission operation in which the flash device is activated to discharge intermittently. The controller subsequently converts each analog signal into a corresponding digital signal in sequence in accordance with each trigger pulse of the periodic pulsed trigger signal before performing a main flash emission operation in which the flash device is activated to discharge at a time of exposure.

The invention provides a flash welding process of a high-strength low-magnetic anchor chain. The flash welding process is characterized in that the burn-off degree reaches 7-9 mm, the upset forging length reaches 6-8 mm, the burn-off speed reaches 1.8-2.0 mm / s, the secondary no-load voltage reaches 4.7 V, and the system pressure reaches 14-16 MPa. Compared with a conventional technological process, the flash welding process has the advantages that a pre-flash process is added, so that the problems about the rapid heat dissipation of a material and the heating of welds during low-temperature welding can be solved, the heat-affected area can be effectively enlarged, the upset forging effect can be guaranteed, and the relatively consistent shapes of welding joints can be guaranteed; sufficient upset forging pressure is exerted on welding end surfaces, gaps among the joints are rapidly reduced, the lintel blasting is stopped, liquid metal and oxide inclusion on the end surfaces are extruded, and joint areas are subjected to certain plastic deformation, so that the progress of recrystallization can be promoted, common crystal grains can be formed, and firm butt joints can be acquired; and after the upset forging is finished, the pressure of electrodes and the pressure of an upset forging oil cylinder are maintained for a certain time, and then the electrodes and the upset forging oil cylinder are cooled, so that the deformation resistance of the joints can be sufficient and welding end ports can be protected against cracking caused by ring-shaped springback.

A method for focusing by using a pre-flash is provided. The method includes the following steps. First, the image sensor captures a first image of the object, wherein the average brightness of the first image is calculated to be Y0. Next, the image sensor captures a second image of the object with the aid of a first pre-flash having a first energy, wherein the average brightness of the second image is calculated to be Y1. Afterwards, the image sensor captures a third image of the object with the aid of a second pre-flash having a second energy, wherein the average brightness of the third image is calculated to be Y2. Then, the distance D to the object is calculated according to the brightness Y0 and the difference ΔY between Y1 and Y2. Finally, the image sensor adjusts the focus according to the distance D.

The invention discloses a method for adjusting the intensity of a flash lamp, which comprises the following steps: emitting a first pre-flash light; capturing a first pre-flash image under the first pre-flash light; emitting a second pre-flash light; capturing a second pre-flash image under the second pre-flash light; selecting the pre-flash image from the first pre-flash image and the second pre-flash image according to the comparison result of the first pre-flash image and the second pre-flash image; computing the flash intensity by means of the selected pre-flash image; emitting a main flash light having the computed flash intensity; capturing a main flash image under the main flash light; and outputting the captured main flash image, wherein the flash intensity of the second pre-flash light is different from that of the first pre-flash light.

The present invention makes it possible to make high-quality recordings of the anterior and / or posterior segments of the eye as an individual image or also as a sequence of images without increasing the radiation load on the eye to be examined. In the method according to the invention, at least one pre-flash is used in order to determine an optimal exposure time for the main flash based on the recording of the pre-flash which is reflected by the object to be recorded. Both the pre-flash and the main flash are controllable and the recordings of the pre-flash and main flash are recorded with the same sensor of the electronic camera and are evaluated electronically by a control unit, and the recording of the main flash and, as the case may be, of the pre-flash is analyzed and / or corrected and displayed to the user.

An apparatus for photographing by using an electronic flash has a photography controller that carries out a pre-flash photography by emitting strobe light in a pre-flash exposure period and subsequently carries out a main flash photography by emitting strobe light; and an exposure adjuster that sets at least one exposure value associated with the pre-flash photography and / or the main flash photography. The exposure adjuster sets an aperture value of a diaphragm that suppresses an occurrence of saturation in image-pixel signals that are generated in an image sensor in the pre-flash exposure period. The photography controller drives the diaphragm in accordance to the set aperture value for the pre-flash photography.

An ultrasonic diagnostic apparatus that performs high acoustic pressure and low acoustic pressure ultrasonic transmissions by switching at predetermined timing in the enhanced ultrasonography, and displays concurrently a replenishment image obtained through the low acoustic pressure transmission in real time like a moving picture, and a pre-flash image obtained through the low acoustic pressure transmission immediately before switching to the high acoustic pressure transmission like a still image to allow the operator to understand the structure at the level of capillaries. It is also possible to display a selected image obtained through the low acoustic pressure transmission at an arbitrary timing instead of the pre-flash image.

The invention discloses a method for regulating the light sensitivity of a digital camera. The method comprises the following steps of: acquiring a live view image corresponding to a plurality of suitable targets by utilizing a shooting module; causing a flash lamp to emit preflash, and acquiring a preflah image corresponding to the suitable targets by utilizing the shooting module; calculating a reflected image according to the live view image and the preflash image; judging the presentation positions of the suitable targets in the preflash image by using the reflection information of each position on the reflected image; executing an identification program for the presentation positions to find image information presenting the suitable targets from the preflash image; judging whether the suitable targets belong to more than two depths of field or not according to the image information of the suitable targets; and when the suitable targets belong to more than two depths of field, regulating the current light sensitivity of the shooting module. By the method, relative distances among the suitable targets are judged as references by the images acquired before and after the pre-flashing of the flash lamp, and a relatively better image is acquired in the supplementary lighting state of the flash lamp.

A method for utilizing preflash of flash lamp to assist focusing includes using an image sensor to pick up an image with shot object and calculating average brightness of it, using flash lamp to carry out preflash with the first energy and using said sensor to pick up image again then calculating out average brightness of it, using flash lamp to carry out preflash with the second energy and using said sensor to pick up image then calculating out average brightness of it, using D-value of three average brightness to calculate out distance D of object to be shot.

The invention discloses a control method, an imaging device, an electronic device, a computer device and a storage medium. The imaging device comprises a plurality of flash lamps, and each scene areain a shot scene is supplemented with light by at least one corresponding flash lamp. The control method comprises the following steps: controlling at least one flash lamp to pre-flash and acquiring apreview image; processing the preview image to identify a face area; positioning a face scene area corresponding to the face area; and controlling the flash lamp corresponding to the face scene area to flash during imaging. According to the method, the flash lamp can be controlled to pre-flash before imaging of the imaging device, the human eyes can adapt to the light supplement of the imaging device under the condition of insufficient ambient light, so as to reduce or avoide the occurrence of red eyes during imaging, and control the corresponding flash lamp to work during imaging by detectingthe face area in the preview image, thereby supplementing light for the face scene area where the face is located, enabling the portrait effect in the shot image to be highlighted, and meeting more requirements of a user.

A flash accessory device readily adaptable to most compact digital camera models provides a hand grip with a mounting base for attachment to the bottom of a compact digital camera. The hand grip contains a multi-mode digital pre-flash detector circuit, a wireless transmitter and a battery power source. An articulating arm extends from the hand grip and is adjustably movable relative to the front of the camera in order to position a sensor on the end of the articulating arm directly in front of the camera's built-in flash. A cup member surrounding the sensor covers the built-in flash to block light emitted by the built-in flash. Light from the built-in flash is detected by the sensor which triggers transmission of a wireless signal from the transmitter to a receiver in a remote flash device to thereby activate illumination of the remote flash in synchronization with activation of the built-in camera flash.