680 results about "Exposure value" patented technology

In an image sensing apparatus using an image sensing device, such as a CCD, to be used by connecting to an external device, such as a computer, an operating rate of the CCD is changed in accordance with a rate at which the computer receives image signals from the image sensing apparatus. Further, when the operating rate of the CCD is changed, a proper exposure value is conjectured to obtain an image sensed at a proper exposure on the basis of operating rates of the CCD before and after the operating rate is changed, and a proper exposure value of the CCD before the operating rate is changed.

An automatic exposure method based on a brightness column diagram includes the following steps: (1) dividing an input image into N*N image blocks; (2) calculating the average imaging brightness; (3) calculating and accounting the column diagram; (4) dividing the bright column diagram into three areas; (5) dividing an underexposure area into m sub-areas; (6) dividing an overexposure area into n sub-areas; (7) for the N*N average bright values, judging whether each average brightness value falls in each sub-area of the underexposure area or the overexposure area; (8) calculating the overexposure value; (9) calculating the underexposure value; (10) adjusting the exposure time. A device for applying the automatic exposure method includes an imaging sensor, an image processing module, a column diagram accounting module and an exposure calculating module. The invention can obtain quicker and more accurate automatic exposure adjustment under different brightness and contrast conditions.

An exposure value is determined based on a face region, with high accuracy and with less effect of a background region or density contrast caused by shadow. For this purpose, a face detection unit detects a face region from a face candidate region in a through image detected by a face candidate detection unit, by fitting to the face candidate region a mathematical model generated by a method of AAM using a plurality of sample images representing human faces. An exposure value determination unit then determines an exposure value for photography, based on the face region.

An image capture module includes an image sensor and a photochromic glass plate. The image sensor includes a photosensitive area. The photochromic glass plate is positioned in front of the photosensitive area, adjusting light transmittance therethrough according to current ambient light conditions, thereby adjusting exposure value of the image sensor. In addition to the image sensor and the photochromic glass plate, the image capture module may further include a lens unit and a packaging substrate. The substrate defines a cavity therein, in which the image sensor is disposed. The photochromic glass plate seals the cavity. The lens unit is disposed on the photochromic glass plate. During image capture, light enters and is transmitted through the lens unit and the photochromic glass plate, forming an image on the photosensitive area of the image sensor. The image sensor converts the visual image into digital data.

A mobile phone terminal with a camera function includes a camera hardware section having an image sensor and a camera lens, an instruction input section for inputting an instruction to start image capturing, an illumination sensor which is arranged on an outer surface of a housing and detects an ambient illumination value while a mobile phone function is activated, and an image capturing start control section. The image capturing start control section sets camera driver software into a standby state after starting it while the mobile phone function is activated. When an instruction to start image capturing is inputted from the instruction input section, the image capturing start control section determines an exposure value used for image capturing by using the detected illumination value, restores the camera driver software, and causes the camera hardware section to perform image capturing using the exposure value.

A system for determining a distance to an object including a solid-state light source for projecting a pattern of discrete spots of laser light towards the object in a sequence of pulses; a detector having a plurality of picture elements, for detecting light representing the pattern of discrete spots as reflected by the object in synchronization with the pulses; and a processor to calculate the distance to the object as a function of exposure values generated by the picture elements. The picture elements are configured to generate exposure values by accumulating, for each pulse of the sequence, a first amount of electrical charge representative of a first amount of light reflected by the object during a first time window and a second electrical charge representative of a second amount of light reflected by the object during a second time window, the second time window occurring after the first time window.

A method for processing high dynamic range (HDR) images by selecting preferred tone mapping operators and gamut mapping algorithms based on scene classification. Scenes are classified into indoor scenes, outdoor scenes, and scenes with people, and tone mapping operators and gamut mapping algorithms are selected on that basis. Prior to scene classification, the multiple images taken at various exposure values are fused into a low dynamic range (LDR) image using an exposure fusing algorithm, and scene classification is performed using the fused LDR image. Then, the HDR image generated from the multiple images are tone mapped into a LDR image using the selected tone mapping operator and then gamut mapped to the color space of the output device such as printer.

A method for tone mapping high dynamic range images for display on low dynamic range displays wherein high dynamic range images are first accessed. The high dynamic range images are divided the into different regions such that each region is represented by a matrix, where each element of the matrix is a weight or probability of a pixel value. An exposure of each region is determined or calculated by estimating an anchor point in each region such that most pixels in each region are mapped to mid grey and the anchor points are adjusted to a key of the images to preserve overall brightness. The regions are then placed or mapped to zones and exposure values are applied to the regions responsive to the weight or probability. The regions are fused together to obtain a final tone mapped image.

There is disclosed a photographic device that uses an image sensor and an electronic viewfinder. When a release button is pressed halfway, an aperture value, an electronic shutter speed and a photosensitivity are decided based on the present subject brightness to provide a proper exposure value for photographing a still image. So long as the release button is kept being pressed halfway, a timing generator drives the image sensor to shoot video images at a frame rate of 20 Hz, and the aperture value decided for still image photography is fixed, whereas the electronic shutter speed and the photosensitivity are adjusted according to the subject brightness by use of an aperture-priority type video program. When the release button is pressed to the full, an exposure for a still image is done with the fixed aperture value.

Method and device for controlling a video recording attribute such as a frame rate and / or an exposure value to suitably record a video depending on a velocity of an object detected by a camera module are provided. The device for controlling a video recording attribute of a camera module includes: a video input unit that receives video data corresponding to frames from the camera module; a motion information acquiring unit that acquires motion information between two successive frames; a video recording attribute determining unit that determines the video recording attribute of the camera module on the basis of the motion information; and a camera module controller that generates a camera module control signal for causing the camera module to perform a video recording operation on the basis of the determined video recording attribute and outputs the camera module control signal to the camera module. Accordingly, it is possible to enhance the processability of an object moving at a high velocity in a surveillance area to accurately detect the object by controlling a video recording attribute (a frame rate and / or an exposure value) of a camera module depending on the velocity of the object moving in the surveillance area.

A technique of acquiring a width obtaining an appropriate exposure with minimum restrictions, while accurately correcting flickering is provided. An exposure control method includes integrating a video signal obtained by shooting a subject by means of a CMOS imaging element as input video signal over not less than a horizontal period, normalizing the integral value or the difference value of the integral value between neighboring fields or frames, extracting the integral value or the difference value after the normalization as flicker spectrum, determining, based on the extracted flicker spectrum, the presence or absence of a flicker component contained in the video signal obtained by the imaging element and controlling the exposure value, using a program diagram for preferentially employing the shutter speed less liable to produce flickering when it is determined that the video signal contains a flicker component.

The present invention uses geographic location co-ordinate as centre, taking single frame or continue photo in 360-degree range, to proceed indifferent split-join to single frame to constitute a new panoramic picture. The photo taking adopts pre-taking and formal taking two stages for realizing panoramic imagery. Said pre-taking obtains imaging range and other parameters. In formal photo taking, the video camera obtains the first picture of continue single picture, and intercepting picture minimal final leg data field, continue judging second picture exposure value, adjusting required amount of exposure, obtaining second picture and intercepting minimal start picture edge data field and tail end picture edge data field, utilizing picture adjacent matching algorithm to proceed optimum matching, to form new image data, then to make optical lens accuracy rotation to precalculated position according to Kn value, continue taking one picture until completing panoramic imagery, then ending.

An image pickup apparatus which makes it possible to obtain a suitable exposure value even if the brightness of the subject changes just before photography preparations and is capable of achieving both of acceleration of photography preparations and high precision exposure control. A ranging control section 42 carries out focus detection control on a subject image in a plurality of control modes. An exposure control section 40 repeatedly carries out feedback exposure control of the subject image so as to maintain proper brightness of an image obtained from an image pickup device 14. A system control circuit 50 controls the exposure control section 40 so as to carry out the feedback exposure control before execution of the focus detection control according to a selected one of the control modes of the raging control section.

The present invention provides an automatic exposure method, device, and imaging apparatus. The method comprises: acquiring a brightness value for a current surrounding; on the basis of a correlation between a preset range of surrounding brightness and a search range for exposure value, determining a current exposure value search range matching the current surrounding brightness value; determining an optimum exposure value within the current exposure value search range for the, and performing an automatic exposure on the basis of the optimum exposure value. Under the present invention, a need to determine the exposure value among the entire exposure value search range is obviated, the range to search for the exposure value is narrowed, thus the number of searches is reduced, the time required for automatic exposure is also reduced, the device is alleviated of computation workload, and device performance is improved.

An imaging element having an imaging surface on which an optical image of a subject field passing through an optical lens is emitted generates an image signal corresponding to the optical image of the subject field by photoelectric conversion. An aperture mechanism controls an aperture of the optical lens. A shutter controls exposure time for the imaging element. An exposure adjustment unit adjusts an exposure value for the imaging surface based on an evaluation value of brightness of the subject field. A focus adjustment unit adjusts a focus position of the optical lens. A CPU detects a foreign object adhering to the optical lens by performing shooting under a plurality of shooting conditions in which the exposure value and the focus position are identical and aperture values are different from each other, and comparing a plurality of the image signals obtained from the imaging element during the shooting.

According to a method of managing photographing conditions for an image sensing apparatus, one of imagess photographed by the image sensing apparatus is selected. The selected image, photographing conditions such as the exposure value and shutter speed in photogrpahing the image, and a separately input photographing status such as the photographing place are stored in association with each other.

In a method and device for monitoring the physiologically effective radio-frequency exposure in at least one specific volume region of an examination subject in a magnetic resonance data acquisition scan in a magnetic resonance system, the magnetic resonance system having a radio-frequency antenna structure with a number of individually controllable radio-frequency signal channels for generation of radio-frequency field distributions in an examination volume including the examination subject, amplitude values are acquired that respectively represent, at specific acquisition points in time, a signal amplitude of the radio-frequency signals emitted or to be emitted via the radio-frequency signal channels in the course of the magnetic resonance measurement. Also, phase values are acquired that represent the phases of the appertaining radio-frequency signals at these points in time. Local exposure values are then determined on the basis of the amplitude values and phase values, these local exposure values respectively representing a physiological exposure that the radio-frequency pulses cause at the examination subject at a specific location at a specific time. Based on this, exposure control values are determined that are compared with predetermined exposure limit values. When an exposure limit values is reached or exceeded, a control signal is output.

An automatic exposure control method and compensation apparatus are disclosed. It includes a coordinate system having sub-ranges with different corresponding exposure compensation values. It includes the setting of bright and dark regions threshold values and the calculation of the ratios of the pixel count in an image where the luminance of each pixel is higher than the bright area threshold value for obtaining a bright area ratio, and also includes the calculation of the ratio of the pixel count in an image where the luminance of each pixel is lower than the dark area threshold value for obtaining a dark area ratio. Afterwards, the image position in the coordinate system is determined. When the image position in the coordinate system is fallen inside one of the sub-ranges, the corresponding exposure compensation value of the sub-range where the image is located is given to compensate the exposure value of the image.

The invention discloses a method of automatic exposure, which comprises the steps of: A. calculating a target exposure value and a current exposure value according to the relation between the brightness value and the exposure value of an image in linear data after initial exposure is carried out and image data is extracted; B. determining the exposure value difference according to the target exposure value and the current exposure value and calculating exposure time deviation value and brightness gain deviation value according to the exposure value difference; C. adjusting an exposure image to new exposure time and new brightness gain and judging whether the difference between the brightness value of the image and a target brightness value under the new exposure time and the new brightness gain meets the condition according to the exposure time deviation value and the brightness gain deviation value, if not, continuing the calculating in the step A until the difference between the brightness value of the image and the target brightness value meets the condition. Meanwhile, the invention also discloses a device of automatic exposure. The embodiment of the invention adopts the linear image data for treatment, which results in the reduction of the calculation amount of the automatic exposure.

A method for providing a reduced exposure value for radiographic imaging obtains a set of flat-field images at two or more exposure values and measures the noise power spectra using the flat field images. At least one noise table is generated according to interpolated noise power spectra for a set of predetermined exposure values. Values from the at least one noise table are applied to a clinical image to form a reduced exposure simulation image. A noise mask is generated according to at least one noise table and the exposure values of the reduced exposure simulation image and added to the reduced exposure simulation image. The reduced exposure simulation image is assessed to generate a desired dose reduction factor.

Aspects of the present disclosure relate to systems and methods for generating High-Dynamic Range (HDR) images. An example device may include one or more processors and a memory. The memory may include instructions that, when executed by the one or more processors, cause the device to identify a number of regions of interest (ROIs) in a preview image, wherein the number of ROIs is more than one, determine a number of images to be captured for an HDR image to be the number of identified ROIs, and for each ROI associated with a respective image of the number of images to be captured, determine an exposure value to be used in capturing the respective image of the number of images.

The invention discloses a camera automatic exposure method, a device, a camera device and a mobile terminal, and relates to the digital photographing technology. The method comprises the steps of determining the current exposure value of a camera on the basis of a camera response curve according to the brightness value of a photograph, wherein the camera response curve is a corresponding relation between the exposure value of the camera and the photograph brightness; determining the exposure compensation amount according to the current exposure value and the optimal exposure value of the camera, and determining the optimal exposure value according to the camera response curve; adjusting the camera so as to adjust the brightness of a photograph pixel according to the exposure compensation amount. On the basis of the inherent response curve of the camera, the current exposure value corresponding to the photograph brightness is obtained, the exposure compensation amount of the current exposure value and the exposure compensation amount of the optimal exposure value are obtained, the brightness of the photograph pixel is adjusted according to the exposure compensation amount, the automatic exposure adjustment is carried out on the basis of the camera inherent response curve and is not carried out on the basis of the brightness value of the taken photograph in the prior art, and the camera automatic exposure method has the advantages of being more accurate, more stable and higher in adaptability.

In a method and device for monitoring the physiologically effective radio-frequency exposure in at least one specific volume region of an examination subject in a magnetic resonance data acquisition scan in a magnetic resonance system, amplitude values are acquired that respectively represent, at specific acquisition points in time, a signal amplitude of the radio-frequency signals emitted or to be emitted via the radio-frequency signal channels. Also, phase values are acquired that represent the phases of the appertaining radio-frequency signals at these points in time. Local exposure values are then determined on the basis of the amplitude values and phase values, respectively representing a physiological exposure that the radio-frequency pulses cause at the examination subject at a specific location at a specific time. Based on this, exposure control values are determined that are compared with predetermined exposure limit values. When an exposure limit values is reached or exceeded, a control signal is output.

An aspect of the present invention provides an image taking device comprising an image pickup device which picks up an image in a field, a luminance measuring device which divides the image into the predetermined number of blocks to measure the luminance level of each block, a reference average luminance level calculating device which calculates an average luminance level in a predetermined reference area in the image, a bright block sampling device which compares the average luminance level in the reference area with the luminance level of each block to sample a bright block high in luminance level, a backlight determining device which determines whether the picked up image is backlit based on the average luminance level of the bright blocks and the average luminance level of the reference area, and an exposure controlling device which calculates an exposure value based on the result of the determination as to the backlight to control exposure.

A solid-state image sensor and a digital cameral capable of executing accurate image-shooting adjustment even in a low illumination environment. A charge coupled device type of image sensor includes red, green and blue pixel cells provided with color filter segments and control cells not provided with color filter segments. When a controller determines that the illumination of a scene to be picked up is short, a digital signal processor generates estimated luminance and contrast values for automatic exposure and automatic focus controls in accordance with the outputs of the control cells. An exposure value and the focal position of a lens are adjusted in accordance with those estimated values. The scene is shot in the form of a still picture in response to a shutter release signal.

An image sensing apparatus that carries out image sensing continuously and inputs a plurality of images, having a digital signal processing circuit that detects, at each input image, from image data thereof, an object that satisfies a preset condition, a first exposure value determination unit that calculates a first exposure value from the image data, a second exposure value determination unit that calculates a second exposure value based on the detected object, and a selection unit that selects either the first exposure value, the second exposure value, a currently set exposure value, or an exposure value calculated based on a luminance of an area referenced when calculating a currently set exposure value as an exposure value to be used for a next image sensing based on object detection results obtained by the digital signal processing circuit.

Generating a high dynamic range image includes obtaining a maximum luminance and a minimum luminance of a scene to be captured, setting a first range of exposure values and a second range of exposure values according to the maximum luminance and the minimum luminance, capturing a first image of the scene according to the first range of exposure values and a second image of the scene according to the second range of exposure values, and superposing the images by compositing luminance information of pixels in corresponding locations of the images according to a tone mapping technique.

Apparatus for digital image stabilization using object tracking includes an image signal processing unit that outputs a first digital image obtained under a first exposure value condition and a plurality of second digital images obtained under a second exposure value condition. The apparatus also includes a shaky hand compensating unit that compensates for motion in comparative second digital images relative to a reference second digital image by tracking an object in either a binary image or a reverse binary image of a respective second digital image that has the most objects (i.e., in the binary or reverse image). The compensating unit then generates a shaky hand compensated image by overlapping the motion-compensated images with the reference image. The apparatus further includes an image property correcting unit that corrects a property of the shaky hand compensated image based on a property of the first digital image.

The embodiment of the invention discloses an image processing device. The device comprises an acquisition module, an image shooting module, a mode selection module and a processing module, wherein theacquisition module is used to acquire state information of terminal equipment; the image shooting module is used to acquire shooting scene information of the terminal equipment; the mode selection module is used to determine an image processing mode according to the state information and the shooting scene information; the image shooting module is further used to acquire an image to be displayed;and the processing module is used to process the image to be displayed according to the image processing mode to obtain a processed image. The embodiment of the invention further discloses an image processing method. According to the image processing method and device disclosed by the embodiment of the invention, different image processing modes can be selected according to determination resultsof the state information of the terminal equipment and the shooting scene information; and a better synthetic image can be obtained by using different exposure values and different image fusion modes.