329results about How to "Avoid overexposure" patented technology

A method for constructing a final image using adaptive exposure control in multiple exposure photography, comprising: (a) capturing an exposure; (b) analyzing the exposure at least to determine deficiencies in the exposure; (c) setting exposure parameters for at least one next exposure adapted to construct the final image with ameliorated deficiencies; (d) capturing the at least one next exposure using the set exposure parameters; and, (e) constructing a final image utilizing portions of at least the two exposures.

Methods, devices and device components are presented for uniformly treating fluids undergoing mixing with electromagnetic radiation. In one aspect, the present invention provides methods of treating a fluid undergoing continuous fluid mixing wherein net radiant energies necessary to provide uniform treatment of the fluid samples with electromagnetic radiation are calculate on the basis of the volume, mass or mixing rate of the fluid or any combination of these variables. In another aspect, the present invention provides algorithms for determining net radiation energies, radiant powers, and / or illumination times necessary for providing uniform treatment of fluid samples. The present invention provides methods for uniformly reducing pathogens in biological fluids, including blood and blood components.

A method for the extraction, separation, fractionation and purification of biopolymers from plant materials using supercritical and / or subcritical solvent extractions is disclosed. Specifically, the process can be used for the separation of resins and rubber from guayule shrub (Parthenium argentatum), and other rubber and / or resin containing plant materials, using supercritical solvent extraction, for example supercritical carbon dioxide extraction. Additionally, polar and / or non-polar co-solvents can be used with supercritical carbon dioxide to enhance the selective extraction of resins and rubbers from the shrub.

The invention relates to an underwater image enhancement method based on dark channel prior algorithm and white balance. The method achieves better image enhancement through the modification of background light, improves the image definition and contrast, and achieves the purpose of image optimization. The employed technical scheme is that the method comprises the following steps: A, background light processing step; B, dark channel prior step: 1, obtaining a fined transmissivity t(x) after image cut and a defogged image through employing the dark channel prior algorithm; 2, exporting a depth map d(x) through the transmissivity t(x); 3, obtaining a needed mask; 4, extracting an AOI (area of interest); C, white balance step. The method is mainly used in an occasion of underwater image enhancement.

A process and a system that determine a glint position and a pupil position are disclosed. The process includes illuminating one eye to produce a glint on that eye, and obtaining a glint image of that eye showing that glint on that eye. A glint position is determined at least in part from that glint image. The process further includes illuminating that eye using polarized light, and obtaining, through a polarizer that can attenuate reflected polarized light, a pupil image of that eye. A pupil position is determined at least in part from that pupil image.

The invention relates to a method, a cryosurgical probe, and a cryosurgical instrument for freezing a lesion on biological tissue. The method involves repeated cycles of freezing and thawing of the tissue to ensure maximum treatment effectiveness. The cryosurgical probe may be positioned on an end of a cryosurgical instrument, and facilitates the freezing of a lesion on biological tissue via the evaporation of a refrigerant. The cryosurgical probe includes a receiving end, a hollow portion, and a tissue contact end. The receiving end is adapted to receive the refrigerant. The tissue contact end includes an orifice adapted to expose the lesion to the refrigerant, and preferably includes a guard portion adapted to prevent excessive exposure of the biological tissue surrounding the lesion to the refrigerant. The hollow portion allows the flow of refrigerant from the receiving end to the tissue contact end, and includes at least one exhaust port.

The invention discloses a flash camera shooting method and a camera shooting device. The flash camera shooting method comprises the following steps of entering into a picture taking mode, judging whether a flashlight turning-on condition is met or not, if yes, turning on a flashlight and keeping the flashlight to be normally on, adjusting the brightness of the flashlight to the appropriate brightness, and accordingly conducting flash camera shooting. Consequently, when a picture is taken in a dark environment (like at night), the flashlight is kept to be normally on in the shooting process, a user can preview the flash shooting effect in real time, what the user sees is obtained, the brightness of the flashlight can be adjusted automatically or manually in the previewing process, the condition that a local area is overexposed or too dark is avoided, and the shooting effect is made best. The user can take pictures again after being satisfied with the shooting effect, the satisfying pictures can be one-time taken, the trouble of repeated shooting is avoided, the shooting efficiency is improved, and user experience is improved.

The invention belongs to the field of image acquisition, and discloses image pick-up equipment and an image acquisition method and device thereof. The method comprises the following steps of: receiving a shooting command; partitioning the photo-sensitive part of the image pick-up equipment into at least two shooting regions, wherein different shooting regions correspond to different exposures; acquiring an image from each shooting region; and synthesizing the images in the shooting regions. By adopting the embodiment of the invention, the problem of excessive or insufficient exposure in the photo taking process can be effectively solved and clearer photos can be obtained.

The invention discloses a scene image processing method and device. The scene image processing method mainly comprises the steps that first exposure and second exposure are determined by obtaining grey levels of all pixel points in a pre-shot image of a shot scene and according to a determined first combined area and a determined second combined area, the grey levels of all the pixel points in a first image area, corresponding to the first combined area, in a first image obtained by carrying out shooting at the first exposure and the grey levels of all the pixel points in a second image area, corresponding to the second combined area, in a second image obtained by carrying out shooting at the second exposure are adjusted respectively, the adjusted two image areas are spliced, and a scene image is obtained. Thus, the problem of excessive exposure or insufficient exposure of the image due to the large brightness and darkness difference in the shot scene is solved, and the scene details of the shot scene are reserved to the maximum extent; meanwhile, the brightness relation between a bright area and a dark area in the shot scene is restored to the maximum extent, and the quality of the scene image is made to be better.

Methods, devices and device components are presented for uniformly treating fluids undergoing mixing with electromagnetic radiation. In one aspect, the present invention provides methods of treating a fluid undergoing continuous fluid mixing wherein net radiant energies necessary to provide uniform treatment of the fluid samples with electromagnetic radiation are calculate on the basis of the volume, mass or mixing rate of the fluid or any combination of these variables. In another aspect, the present invention provides algorithms for determining net radiation energies, radiant powers, and / or illumination times necessary for providing uniform treatment of fluid samples. The present invention provides methods for uniformly reducing pathogens in biological fluids, including blood and blood components.

The invention discloses an underwater image enhancement method based on a foreground model. The method comprises the following steps that: improving a background light estimation method so as to effectively avoid the influences of underwater image overexposure, artificial light sources and the like; combining with the cognition of people for the underwater image, and utilizing a dark channel priori algorithm to remove background scattering and extract the foreground model; and combining with a white balance algorithm to put forward a color correction method suitable for the underwater image, and utilizing the attenuation characteristic of light in water to correct channel gains according to a relationship between channel attenuation coefficients so as to compensate color distortion caused by attenuation; and utilizing the channel gains to regulate a fogless image, and finally, obtaining the enhanced underwater image. By use of the method, the enhancement effect of an object part is clear and distinct, and a visual effect is better; image blurring is effectively removed, so that the definition of the enhanced underwater image is greatly improved, image details are better, the image enhancement of the background part is not affected on the basis of the color correction of the foreground model, the enhanced underwater image has more natural integral colors, and image brightness is within an acceptable range.

The embodiment of the invention discloses a shooting method, a terminal and a computer readable storage medium. The method includes the following steps: dividing a first collected image into N regions, and determining N first current brightness values corresponding to the N regions, wherein N is a natural number greater than 1; determining M regions meeting preset conditions on the basis of the N first current brightness values, wherein M is a natural number greater than or equal to 1, and M<N; determining correction photometric weights of the M regions on the basis of preset photometric weights of the M regions; determining adjustment brightness values of the first image on the basis of the first current brightness values of the M regions, the corresponding correction photometric weights, first current brightness of (N-M) regions in which the M regions are removed from the N regions as well as the corresponding preset photometric weights; and determining exposure parameters on the basis of the adjustment brightness values, and conducting shooting on the basis of the exposure parameters.

The invention discloses an image processing method, an image processing device, a storage medium and a mobile terminal. The image processing method is applied to the mobile terminal and comprises thesteps of: acquiring an original image collected by the mobile terminal, wherein the color depth of the original image is at least 10 bits per pixel; determining a brightest region in the original image, and performing exposure processing on the brightest region to obtain intermediate image data; and performing logarithm conversion on the intermediate image data to obtain a target image. Accordingto the image processing method of the invention, gamma correction does not need to be carried out on the intermediate image data, but logarithm conversion is carried out, and more detail features of bright parts and dark parts of the image are reserved by using logarithm conversion; and on the other hand, exposure processing is carried out according to the brightest region, detail feature loss isavoided, and more detail features are reserved.

An image sensor pixel has variable conversion gain to prevent overexposure of the pixel without reducing the exposure period. Under dim lighting conditions, the pixel operates with high conversion gain and is highly sensitive to light. When the incident light is bright, the pixel switches into a low conversion gain, low-sensitivity mode. The variable conversion gain is implemented by connecting a variable capacitive load in parallel with the photodiode of the image sensor pixel. When the incident light intensity exceeds a certain threshold, the variable capacitive load is increased to allow the photodiode to absorb more light. Likewise, the variable capacitive load is decreased when the incident light intensity is below a certain threshold.

The invention discloses a mobile terminal and a flash lamp control method. The flash lamp control method comprises the following steps: when the shooting function of the mobile terminal is started up, acquiring the light intensity required by normal exposure of a camera; acquiring the light intensity of the current environment; comparing the light intensity of the current environment with the light intensity required by the normal exposure of the camera, and calculating the differential value between the light intensity of the current environment and the light intensity required by the normal exposure of the camera if the light intensity of the current environment is not within a range of the light intensity required by the normal exposure of the camera; and controlling the start-up brightness of a flash lamp according to the differential value. By utilizing the method, the intensity of the flash lamp can be calculated according to the light intensity of the current environment, so that the overexposure is avoided, and the current consumption is also reduced.

The invention relates to a device (200) for a measurement of the status, as far as relevant for determining the UV irradiation dose, of the skin of a person on his / her skin (cutis), comprising (a) a means (201) for emitting radiation having a defined spectral composition onto the skin (cutis); (b) optionally a means (211) for advancing the radiation of a defined composition to the emission means (201); (a) a sensor (202) for measuring the portion of the radiation irradiated by the emission means (201) which is reflected or absorbed by the skin (cutis); and (d) means (212) for providing energy to the means (201) and / or to the sensor (202) and for transmitting measured data to a data analyzing means (203). The invention also relates to an apparatus (100) and a process for irradiating the body of a user for cosmetic and medical purposes.

The invention relates to an intelligent traffic camera, and discloses a method and a device for automatically controlling local lighting amount of the intelligent traffic camera. The intelligent traffic camera comprises a filter set, wherein the filter set comprises a first filter and a second filter; the first filter is located above the second filter; the transmission rate of the first filter is smaller than the transmission rate of the second filter. The method for automatically controlling the local lighting amount of the intelligent traffic camera comprises the following step of when the lighting intensity of the scene of a current video frame is judged to be lower than a threshold value, moving the filter set, so that the first filter and the second filter respectively cover one part of area of the whole scene, and the first filter covers the area where traffic lights are located. The filter set is controlled to move to the appropriate position according to different scene modes, and when other modes are switched to the low-light scene mode, the lighting amount of the traffic light area is limited, and the aim of avoiding overexposure of red lights is achieved, so that the problem that the red lights are a little yellow is avoided.

The invention relates to the field of electronics, and discloses a picture and video photographing method and device for a mobile terminal. According to the invention, the method comprises the following steps: controlling a flash lamp to be turned on at least one time at a stage of frame and previewing, wherein the power of the flash lamp during turning-on is less than or equal to the maximum power; obtaining one or more real-time pictures obtained by the real-time framing of a camera when the flash lamp is turned on, and obtaining trial picture brightness through image analysis; determining a final photographing parameter according to the trial picture brightness and an corresponding to-be-adjusted parameter value; and controlling the flash lamp and the camera for formal photographing at a formal photographing stage through a final photographing parameter. The method can determine the satisfactory flashing lamp power, light-emitting time, camera gain, diaphragm and shutter time in an automatic or manual mode during formal photographing of pictures and videos, and prevents improper photographing parameters from causing insufficient exposure or excessive exposure of obtained pictures or videos.

The invention relates to an infrared-camera-device-based adaptive control system. A gain value of automatic gain control of an infrared camera device is obtained; if the gain value is larger than or equal to a preset first threshold value, the infrared camera device is controlled to start a black-and-white shooting mode; and the brightness of an infrared ray of the infrared camera device is adjusted in real time based on the gain value, so that the infrared camera device can adapt to an external shooting environment. According to the technical scheme, the black-and-white shooting mode can be started only by determining the gain value size corresponding to the current external shooting environment brightness information instead of setting a photoresistor, so that the infrared camera device can enter a night working state. Furthermore, the infrared camera device can adjust the brightness of the infrared ray based on changing of the external shooting environment, thereby avoiding an overexposure phenomenon, improving an image effect, and reducing power consumption of the infrared camera device.

An imaging device is disclosed, and comprises an image sensor and an electronic black card. The image sensor comprises a sensitization surface provided with a plurality of sensitization units and a microprocessor. The microprocessor comprises a brightness analysis module and a judgment module. The brightness analysis module carries out analysis on the environment brightness to obtain an optimal exposure time. The judgment module judges whether the image has an over-exposed area. The electronic black card is located on one side of the sensitization surfaces of image sensor, and comprises a plurality of switch units corresponding to the sensitization units, and a control unit. The control unit is used for calculating opening time of each switch unit, and controlling the opening and closing of each switch unit according to the opening time of each switch unit. The imaging device of the invention controls sensitization time of each sensitization unit by opening and closing each switch unitof the electronic black card, so as to avoid over-exposure of the image before the image is generated. In addition, an imaging method is also provided.

The invention discloses a light sensing control method and a light sensing control device. The light sensing control method comprises the following steps: performing photometric analysis on a preview image of a collected scene, dividing the collected preview image into a plurality pixel regions, and calculating a light intensity value of each pixel region of the plurality of pixel regions; calculating the corresponding light sensing time of each pixel region of the collected preview image according to the calculated light intensity values of the plurality of pixel regions; and performing light sensing on each pixel region according to the corresponding light sensing time. By adopting the light sensing control method and the light sensing control device disclosed by the invention, phenomena of overexposure and underexposure possibly occur when too dark areas or too bright areas synchronously exist in a shoot scene can be effectively avoided.

The invention discloses an exciting method of flash lamp, which is characterized by the following: utilizing video picking-up device to generate focusing parameter during focusing time; estimating the shooting distance; deciding the exciting strength of flash lamp dynamically; obtaining modified light filling effect; saving power and shooting time; improving picking-up and flash lamp effect obviously.

The embodiment of the invention provides an exposure parameter adjustment method, device and equipment and a computer readable storage medium. The method comprises the following steps: acquiring an imaging image; determining a brightness value of each region in the imaged image; according to the brightness value of each region in the imaging image, selecting the region with the brightness value greater than a preset threshold as an effective exposure region; and determining exposure parameters according to the brightness value of the effective exposure area. According to the invention, the problem of image overexposure caused by the fact that the imaging size of the endoscope equipment is smaller than the photosensitive area of the imaging image sensor in the prior art is solved, and the image overexposure is avoided.

A method and an arrangement detect harmful substances while eliminating or minimizing the drawbacks of an ion mobility spectrometer (IMS). The sample gas flow is mixed with a reference gas utilizing a pump (7). A reaction gas is supplied via a metering unit (10) to the ion-mobility spectrometer (2) when complex ion-mobility spectrometer spectra are present. The measurement signals obtained as to the gas-quantity ratio between the sample gas and the reference gas are adapted to the original concentration and are then compared to previously defined and stored measured values via a signal height comparison or a pattern recognition. The measuring system is rinsed following the measurement phase by feeding the reference gas and is cleaned by metering an additional cleansing gas when harmful substances are detected which could be rinsed away. Such methods and measuring systems are used for identifying harmful substances in ambient air.

A receptor positioning device for taking dental bitewing radiographs of a patient's teeth comprises a receptor holding member adapted to receive a receptor for exposing x-radiation from the x-ray machine and a collimation plate having a substantially flat surface for aligning with an x-ray machine. The collimation plate has a rectangular opening in its surface for passage of radiation from the x-ray machine to expose a receptor in the receptor holding member and a pair of handles extending away from the plate for positioning the device. The collimation plate is constructed of metal having a thickness of at least 0.075 in., preferably at least 0.100 in., to reduce the passage of radiation from the x-ray machine to the patient except at the plate opening. The device also includes an arm between the collimation plate and the receptor holding member, the arm including a biting surface for engaging the patient's teeth to secure the device in the patient's mouth, and an aiming ring secured to the arm at a position distal from the receptor holding member, with the collimation plate being secured to the aiming ring. The aiming ring may also include notches and the collimation plate preferably includes clips for removably securing the plate to the aiming ring and tabs for locating the plate relative to the aiming ring notches.

The invention provides an image strong light inhibition adaptation control method, comprising steps of obtaining a histogram of an image in a video, determining a preset exposure regulation value after marking the brightness state of the image through calculating through brightness area judging, brightness area proportion statistic, and calculation of a high brightness weight, an over-exposure weight, average brightness and weighting average brightness so as to perform additional exposure control and reduction exposure control on the image. The image strong light inhibition adaption control method and device improve an integral effect of the image and are applicable to adaptive exposure control of full-weather strong light scenes with various contrasts.

The invention discloses an exposure regulation terminal and method based on double cameras, and relates to the technical field of image processing. The exposure regulation terminal based on double cameras comprises a first camera module, a second camera module and a regulation control module, wherein the regulation control module is used for respectively controlling and regulating a first shooting parameter of the first camera module and a second shooting parameter of the second camera module when a first exposure quantity exceeds a second exposure quantity preset range so as to enable the first exposure quantity and a second exposure quantity to be in the preset range. According to the exposure regulation terminal and method based on double cameras, which are disclosed by the invention, a foreground image is obtained by a first camera, a background image is obtained by a second camera, shooting parameters of the first camera and the second camera are regulated according to the exposure quantities of the foreground image and the background image to enable the exposure quantities of the foreground image and the background image to be consistent, so that an exposure effect of a synthetic image is ensured.