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230 results about "High-dynamic-range imaging" patented technology
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High-dynamic-range imaging (HDRI) is a high dynamic range (HDR) technique used in imaging and photography to reproduce a greater dynamic range of luminosity than what is possible with standard digital imaging or photographic techniques. The aim is to present a similar range of luminance to that experienced through the human visual system. The human eye, through adaptation of the iris and other methods, adjusts constantly to adapt to a broad range of luminance present in the environment. The brain continuously interprets this information so that a viewer can see in a wide range of light conditions.
Apparatus and method for high dynamic range imaging using spatially varying exposures
InactiveUS6864916B1Minimize the numberSubstantial lossTelevision system detailsColor signal processing circuitsHigh-dynamic-range imagingUltrasound attenuation
Apparatus and methods are provided for obtaining high dynamic range images using a low dynamic range image sensor. The image of a scene is captured with an image sensor using a spatially varying exposure function. The spatially varying exposure function can be implemented in a number of ways, such as by using as an optical mask with a fixed spatial attenuation pattern or by using an array of light sensing elements having spatially varying photosensitivities. The captured image is then normalized with respect to the spatially varying exposure function. The normalized image data can be interpolated to account for pixels that are either saturated or blackened to enhance the dynamic range of the image sensor.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK +1
Imaging method and system
ActiveUS20050275747A1Improve dynamic rangeIncrease frame rateTelevision system detailsColor television detailsHigh-dynamic-range imagingViewpoints
A method and system for accurately imaging scenes having large brightness variations. If a particular object in the scene is of interest, the imager exposure setting is adjusted based on the brightness of that object. For high dynamic range imaging of an entire scene, two imagers with different viewpoints and exposure settings are used, or the exposure setting of a single imager is varied as multiple images are captured. An optical flow technique can be used to track and image moving objects, or a video sequence can be generated by selectively updating only those pixels whose brightnesses are within the preferred brightness range of the imager.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
Systems and Methods for High Dynamic Range Imaging Using Array Cameras
ActiveUS20160057332A1Television system detailsSignal generator with multiple pick-up deviceHigh-dynamic-range imagingActive camera
Systems and methods for high dynamic range imaging using array cameras in accordance with embodiments of the invention are disclosed. In one embodiment of the invention, a method of generating a high dynamic range image using an array camera includes defining at least two subsets of active cameras, determining image capture settings for each subset of active cameras, where the image capture settings include at least two exposure settings, configuring the active cameras using the determined image capture settings for each subset, capturing image data using the active cameras, synthesizing an image for each of the at least two subset of active cameras using the captured image data, and generating a high dynamic range image using the synthesized images.
Owner:FOTONATION LTD
Illumination systems and methods for computer imagers
ActiveUS20090175555A1Television system detailsColor signal processing circuitsHigh-dynamic-range imagingLighting system
The present invention can provide solutions to many common imaging problems, such as, for example, unevenly distributed illumination, shadows, white balance adjustment, colored ambient light and high dynamic range imaging. Imaging systems and methods can be provided through a computer (e.g., laptop or desktop) such that the system or method can take advantage of the computer's processing power to provide functionality that goes beyond typical camera. Such an imaging system may include an imaging device, a camera, a light source and a user interface.
Owner:APPLE INC
Apparatus and method for high dynamic range imaging using spatially varying exposures
InactiveUS7924321B2Minimize the numberSubstantial lossTelevision system detailsColor signal processing circuitsHigh-dynamic-range imagingUltrasound attenuation
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK +1
High dynamic range imager circuit and method for reading high dynamic range image
ActiveUS20120256077A1Improve dynamic rangeTransistorTelevision system detailsCapacitanceHigh-dynamic-range imaging
The present invention discloses a high dynamic range imager circuit and a method for reading high dynamic range image with an adaptive conversion gain. The high dynamic range image circuit includes a variable capacitor. The capacitance of the variable capacitor is adjusted according to sensed light intensity or by internal feedback control, to adaptively adjust the conversion gain of the high dynamic range image circuit as it reads a signal which relates to a pixel image sensed by an image sensor device. In each cycle, the signal can be read twice or more with different dynamic ranges, to enhance the accuracy of the signal.
Owner:SK HYNIX INC
Motion/saturation detection system and method for synthesizing high dynamic range motion blur free images from multiple captures
ActiveUS7061524B2Improve dynamic rangeEasy to optimizeTelevision system detailsTelevision system scanning detailsHigh-dynamic-range imagingSingle chip
Motion / Saturation detection system and method for synthesizing high dynamic range motion blur free images from multiple captures, the system and method utilizing photocurrent estimation to reduce read noise and enhance dynamic range at the low illumination end, saturation detection to enhance dynamic range at the high illumination end, and motion blur detection to ensure the photocurrent estimation is not corrupted by motion. Motion blur detection also makes it possible to extend exposure time and to capture more images, which can be used to further enhance dynamic range at the low illumination end. The present invention operates completely locally, making it well suited for single chip digital camera implementations.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
High dynamic range imaging device using multiple pixel cells
ActiveUS20070035653A1Improve dynamic rangeReduce Fixed Pattern NoiseTelevision system detailsImage enhancementHigh-dynamic-range imagingVolumetric Mass Density
A method and apparatus for achieving high-dynamic range operation with a set of spatially distributed pixel cells is provided. A pixel array with a row of pixels having apertures of varying sizes in a metal mask formed thereon controls the sensitivity of each pixel cell to light. A neutral density filter having varying light transparency values is also provided over the set of pixel cells to control the sensitivity of each pixel cell to light. The pixel cells voltage outputted is combined to obtain high-dynamic range operation.
Owner:APTINA IMAGING CORP
Method for real-time implementable local tone mapping for high dynamic range images
InactiveUS20090041376A1Clear detailsImage enhancementImage analysisHigh-dynamic-range imagingTone mapping
The present invention relates to a method capable of real-time implementable local tone mapping of high dynamic range images. In one embodiment, the present invention relates to a method capable of accomplishing real-time local tone mapping of high dynamic range images so that they have clear details without, for example, halo artifacts when viewed on standard display devices. In another embodiment, the present invention relates to a method capable of accomplishing real-time local tone mapping of high dynamic range images so that they have clear details without, for example, halo artifacts when viewed on standard display devices where such a method utilizes, in part, a modified Reinhard operator.
Owner:THE UNIVERSITY OF AKRON
Automatic selection of optimum algorithms for high dynamic range image processing based on scene classification
InactiveUS20150170389A1Enhance HDR image processingImprove image processing capabilitiesImage enhancementImage analysisHigh-dynamic-range imagingTone mapping
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.
Owner:KONICA MINOLTA LAB U S A INC
Systems and methods for local tone mapping of high dynamic range images
This is generally directed to systems and methods for local tone mapping of high dynamic range (“HDR”) images. For example, a HDR image can have its larger dynamic range mapped into the smaller dynamic range of a display device. In some embodiments, to perform the local tone mapping, a RGB to Y converter can be used to convert the input image signal to a luminance signal in the YCgCo color space, a shape adaptive filter can be used to separate the luminance signal into its illumination and reflectance components, contrast compression can be applied to the illumination component, image sharpening can be applied to the reflectance component, and the processed illumination and reflection components can be used to calculate a processed RGB signal. The dynamic range of the processed RGB signal can then be mapped into the dynamic range of the display device.
Owner:SEMICON COMPONENTS IND LLC
High dynamic range image editing
InactiveUS6888552B2Easy to editSignificant lossImage enhancementImage analysisHigh-dynamic-range imagingLight intensity
A high dynamic range image editing system for editing an image file having pixels spanning a first range of light intensity levels in an image editing system that only displays differences in the light intensity levels of pixels within a second range of light intensity levels that is less than the first range of light intensity levels, without reducing the range of light intensity levels in the image file.
Owner:CALIFORNIA UNIV OF SOUTHERN
Image processing method and mobile terminal
ActiveCN105227858AAvoid distortionReal-time adjustment of high dynamic exposure timeTelevision system detailsColor television detailsHigh-dynamic-range imagingImaging processing
Embodiments of the invention provide an image processing method and a mobile terminal, and belong to the technical field of communication. The method comprises the following steps: obtaining image data of collected frames in a high dynamic range image shooting process; analyzing the brightness of the image data, determining ambient brightness, and adjusting a high dynamic exposure time based on the determined ambient brightness; shooting according to the adjusted high dynamic exposure time to generate low dynamic range image data; and calculating the low dynamic range image data according to a preset synthesis algorithm to generate a high dynamic range image. The image processing method provided by the embodiments of the invention can be used for avoiding a high dynamic range image distortion problem caused by a fixedly set high dynamic exposure time and enabling the high dynamic range image to reflect the true environments of all scenes, namely, true details of a picture can be restored.
Owner:VIVO MOBILE COMM CO LTD
High dynamic range image generation and rendering
Techniques and tools for high dynamic range (HDR) image rendering and generation. An HDR image generating system performs motion analysis on a set of lower dynamic range (LDR) images and derives relative exposure levels for the images based on information obtained in the motion analysis. These relative exposure levels are used when integrating the LDR images to form an HDR image. An HDR image rendering system tone maps sample values in an HDR image to a respective lower dynamic range value, and calculates local contrast values. Residual signals are derived based on local contrast, and sample values for an LDR image are calculated based on the tone-mapped sample values and the residual signals. User preference information can be used during various stages of HDR image generation or rendering.
Owner:MICROSOFT TECH LICENSING LLC
Visual computing-based optical field imaging device and method
ActiveCN102833487AEasy to parseHigh precisionTelevision system detailsColor television detailsHigh-dynamic-range imagingDepth of field
The invention discloses a visual computing-based optical field imaging device and method. The visual computing-based optical field imaging device comprises an optical imaging system, an integrated near-infrared light source, a data transmission module, a high-capacity cache unit, a human-machine interaction device, a logic control unit and a processing unit. The invention provides an optical field imaging device based on a computing and imaging interactive mutual-beneficial mode; and with optical field imaging as the leading and deep perception and high-dynamic range imaging as the assistance, visual perception intelligent and visual cognition precision are realized, novel visual information with characteristics of large depth-of-field, wide dynamic range, actual three dimension, high resolution and capability of collecting and editing is obtained, and accuracy and robustness of a visual computing task are improved through data innovation of a visual perception source; and the optical field imaging device is widely applied to the fields of internet of things, security monitoring and control, biological recognition, intelligent transportation system, aerial remote sensing, digital medical treatment, animation media and the like.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI
Adjusting method and device with high dynamic range
InactiveCN101707666AReasonable high dynamic range adjustment technologyImprove image qualityTelevision system detailsColor television detailsHigh-dynamic-range imagingImaging quality
Owner:VIMICRO CORP
High Dynamic Range Imaging of Environment with a High Intensity Reflecting/Transmitting Source
ActiveUS20170234976A1Minimizing frame durationReduce ambient light accumulationOptical signallingElectromagnetic wave reradiationSensor arrayHigh-dynamic-range imaging
Active-gated imaging system and method for imaging environment with at least one high-intensity source. A light source emits light pulses toward the environment, and an image sensor with a pixelated sensor array receives reflected pulses from a selected depth of field and generates a main image. The image sensor exposure mechanism includes a pixelated transfer gate synchronized with the emitted pulses. An image processor identifies oversaturated image portions of the main image resulting from a respective high-intensity source, and interprets the oversaturated image portions using supplementary image information acquired by image sensor. The supplementary information may be obtained from: a low-illumination secondary image having substantially fewer gating cycles than the main image; by accumulating reflected pulses from the high-intensity source after the reflected pulses undergo internal reflections between optical elements of the camera; or a low-illumination secondary image acquired by residual photon accumulation during a non-exposure state of image sensor.
Owner:BRIGHTWAY VISION
High dynamic range imager with a rolling shutter
ActiveUS7397509B2Television system detailsTelevision system scanning detailsHigh-dynamic-range imagingRolling shutter
Owner:MICRON TECH INC
Tone mapping of high dynamic range images
InactiveUS7433514B2Enhanced visual cuesReduce artifactsImage enhancementImage analysisHigh-dynamic-range imagingTone mapping
Tone mapping a high dynamic range (HDR) image is performed by obtaining a log-norm luminance component based on a normalized logarithm of the HDR image. The log-norm luminance component is flattened (tone-compressed) using incrementally-spaced adaptation levels, which are increasingly blurrier representations of the log-norm luminance component, weighted by a diminishing factor. Visual cues are restored by injecting a proportion of values of the log-norm luminance component, applying histogram tail clipping, and applying a sigmoid curve mapping, to create a restored luminance component. A tone-compressed image is obtained by mapping luminance of the HDR image using the restored luminance component and adjusting saturation of the mapped HDR image.
Owner:CANON KK
Enhanced tone mapper for high dynamic range images and video
ActiveUS20170103729A1Increase the luminous rangeEnhance the imageTelevision system detailsColor television with two-channel transmissionStandard dynamic rangeHigh-dynamic-range imaging
Various embodiments provide tone mapping of images and video from one dynamic range to an available dynamic range of a display device while preserving or enhancing image details. According to one embodiment, an enhanced tone mapping module is configured to decrease a luminance of an image or video from a high dynamic range to a standard dynamic range. Conversely, according to one embodiment, an enhanced inverse tone mapper to increase a luminance of an image or video from a standard dynamic range to a high dynamic range.
Owner:STMICROELECTRONICS ASIA PACIFIC PTE
Method and apparatus for motion artifact removal in multiple-exposure high-dynamic range imaging
ActiveUS20100259626A1Television system detailsColor television detailsHigh-dynamic-range imagingSingle exposure
Methods and apparatuses for correcting image artifacts in a high dynamic range image formed by combining a plurality of exposures taken at different integration periods. A determination is made as to whether there is motion between the exposures. If motion is detected, pixel signal values chosen are replaced with pixel signal values from another exposure.
Owner:APTINA IMAGING CORP
High dynamic range imaging cell with electronic shutter extensions
InactiveUS20090141155A1Improved extended dynamic rangeReduce capacitanceTelevision system detailsTelevision system scanning detailsCapacitanceHigh-dynamic-range imaging
A pixel sensor cell of improved dynamic range and a design structure including the pixel sensor cell embodied in a machine readable medium are provided. The pixel cell comprises a coupling transistor that couples a capacitor device to a photosensing region (e.g., photodiode) of the pixel cell, the photodiode being coupled to a transfer gate and one terminal of the coupling transistor. In operation, the additional capacitance is coupled to the pixel cell photodiode when the voltage on the photodiode is drawn down to the substrate potential. Thus, the added capacitance is only connected to the imager cell when the cell is nearing its charge capacity. Otherwise, the cell has a low capacitance and low leakage. In an additional embodiment, a terminal of the capacitor is coupled to a “pulsed” supply voltage signal that enables substantially full depletion of stored charge from the capacitor to the photosensing region during a read out operation of the pixel sensor cell. In various embodiments, the locations of the added capacitance and photodiode may be interchanged with respect to the coupling transistor. In addition, the added capacitor of the pixel sensor cell allows for a global shutter operation.
Owner:GLOBALFOUNDRIES INC
Temporally Aligned Exposure Bracketing for High Dynamic Range Imaging
InactiveUS20100225783A1Television system detailsColor television detailsHigh-dynamic-range imagingSingle image
The invention provides an optical imaging system for temporally aligning bracketed exposures of a single image, the system comprising a light aperture, a prism and a image capturing device, where the prism is capable of splitting an incoming image from the light aperture into at least two temporally aligned images, and where the image capturing device captures the temporally aligned images at different levels of exposure.
Owner:WAGNER PAUL A
Multiple image camera and lens system
A system for simultaneously producing multiple images substantially identical images on multiple separate detector planes is disclosed. A reflective spatially beam-splitting element preferably comprising multiple reflective areas is preferably placed at a location substantially coincident with the pupil or aperture of the system. In non-diffraction limited systems, each area preferably comprises an actual cross section that is circular or has the rotational symmetry (or a multiple thereof) of the number of images to be formed. In diffraction limited systems, all of the areas preferably comprise actual cross sections that have the same shape, size and orientation with respect to the incoming optical beam. Each individual actual cross section may be due to the shape of each area, optionally in combination with a mask. Appropriate selection of filters enables real-time multi-spectral scientific imaging, imaging polarimetry, or high dynamic range imaging (HDRI) for photography and cinematography, even with a moving camera and / or moving subjects.
Owner:CONTRAST INC
High-robustness geometric correction method adapted to random projector group and projection screen
InactiveCN104036475ATelevision system detailsImage enhancementHigh-dynamic-range imagingProjection screen
The invention belongs to image display processing of a computer system, and especially relates to a high-robustness automatic geometric correction method. In the method, a fine mapping relation between a projection characteristic image and a camera multi-view image is about to be established so as to form an incident light angle coordinate relation grid of each pixel in a projection image relative to an observation point and enable a complex three-dimensional geometric calibration problem to change to a relatively simple two-dimensional geometric calibration problem. Based on this, by means of a high dynamic range imaging technology, color information of each pixel position of a projector can be measured by use of a common camera and a low-precision holder, a light field distribution mathematic model on a whole projection curtain is established, and a high-speed calculating process for color correction and edge fusion of all projectors can be autonomously finished through a non-linear optimization solving technology.
Owner:成都智慧星球科技有限公司
Generation of high dynamic range images from low dynamic range images
InactiveUS20130107956A1Easy to codeReduced residual signalColor television with pulse code modulationColor television with bandwidth reductionHigh-dynamic-range imagingImaging quality
An approach is provided for generating a high dynamic range image from a low dynamic range image. The generation is performed using a mapping relating input data in the form of input sets of image spatial positions and a combination of color coordinates of low dynamic range pixel values associated with the image spatial positions to output data in the form of high dynamic range pixel values. The mapping is generated from a reference low dynamic range image and a corresponding reference high dynamic range image. Thus, a mapping from the low dynamic range image to a high dynamic range image is generated on the basis of corresponding reference images. The approach may be used for prediction of high dynamic range images from low dynamic range images in an encoder and decoder. A residual image may be generated and used to provide improved high dynamic range image quality.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Imaging method and system
ActiveUS7495699B2Improve dynamic rangeIncrease frame rateTelevision system detailsColor television detailsHigh-dynamic-range imagingViewpoints
A method and system for accurately imaging scenes having large brightness variations. If a particular object in the scene is of interest, the imager exposure setting is adjusted based on the brightness of that object. For high dynamic range imaging of an entire scene, two imagers with different viewpoints and exposure settings are used, or the exposure setting of a single imager is varied as multiple images are captured. An optical flow technique can be used to track and image moving objects, or a video sequence can be generated by selectively updating only those pixels whose brightnesses are within the preferred brightness range of the imager.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
In-pixel high dynamic range imaging system and imaging sensor pixels
The application relates to an in-pixel high dynamic range imaging system and imaging sensor pixels. Embodiments of the invention describe providing high dynamic range imaging (HDRI or simply HDR) to an imaging pixel by coupling a floating diffusion node of the imaging pixel to a plurality of metal-oxide semiconductor (MOS) capacitance regions. It is understood that a MOS capacitance region only turns on (i.e., changes the overall capacitance of the floating diffusion node) when the voltage at the floating diffusion node (or a voltage difference between a gate node and the floating diffusion node) is greater than its threshold voltage; before the MOS capacitance region is on it does not contribute to the overall capacitance or conversion gain of the floating diffusion node. Each of the MOS capacitance regions will have different threshold voltages, thereby turning on at different illumination conditions. This increases the dynamic range of the imaging pixel, thereby providing HDR for the host imaging system.
Owner:OMNIVISION TECH INC
Method used for generating high dynamic range image with single low dynamic range image
ActiveCN107045715AEasy to handleImprove operational efficiencyImage enhancementImage analysisHigh-dynamic-range imagingTone mapping
The invention proposes a method used for generating a high dynamic range image with a single low dynamic range image. The method comprises the steps that based on the human visual characteristics, the luminance component and the chrominance component of the low dynamic range image are separated; gamma correcting and edge-preserving filtering are carried out on the luminance component; the basic layer of the luminance component is extracted; traverse operating is carried out on the basic layer and the luminance component to acquire the detail layer of the luminance component; an anti-tone mapping function is constructed; anti-tone mapping operation is carried out on the detail layer and the gamma-corrected luminance image to acquire the respective anti-color collimated image; the luminance component after anti-tone mapping and the detail layer are merged to acquire a new luminance component; the chrominance component and the new luminance component are merged; and contrast stretching and denoising are carried out on the merged image to acquire the final high dynamic range image. According to the invention, the high dynamic range image is acquired through the single low dynamic range image, and the method has the advantages of good processing effect, high operability and wide applicability.
Owner:SOUTHWEAT UNIV OF SCI & TECH
High dynamic range (HDR) image synthesis with user input
InactiveUS20120288217A1Maximizing image qualityIncrease dynamicsTelevision system detailsImage enhancementHigh-dynamic-range imagingCamera response function
A new high dynamic range image synthesis which can handle the local object motion, wherein an interactive graphical user interface is provided for the end user, through which one can specify the source image for separate part of the final high dynamic range image, either by creating a image mask or scribble on the image. The high dynamic range image synthesis includes the following steps: capturing low dynamic range images with different exposures; registering the low dynamic range images; estimating camera response function; converting the low dynamic range images to temporary radiance images using estimated camera response function; and fusing the temporary radiance images into a single high dynamic range (HDR) image by employing a method of layered masking.
Owner:THOMSON LICENSING SA
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