Abstract: A method for enhancing imaging in low light conditions. The method comprises acquiring two or more images, long images relating to long exposure times and a short images relating to short exposure times; processing the images to separate zones with high image details from zones of low image details; and reconstructing a final image where image information is selected from the short image in zones with high image details and from the long image in zones with low image details.

Abstract: A plurality of image data different in exposure condition are separated into a plurality of luminance component image data and a plurality of color-difference component image data, and the luminance component image data and the color-difference component image data are inputted to an image combining portion 11. A luminance component combining section 21 averages and smoothes the plurality of image data different in exposure condition and sets combining rates of the plurality of image data different in exposure condition by using the smoothed average luminance component image data. The separated plurality of luminance component image data are combined by using the set combining rates with respect to each attention pixel. On the other hand, a color-difference component combining portion 22 combines the separated plurality of color-difference component image data by using the combining rates used in the luminance component combining section 21.

Abstract: An image acquisition system comprises: a single set of focussing optics focussing an incident beam from a scene to be imaged on a first sensor and a second sensor exhibiting identical spectral response curves; followed by separation means separating the irradiance of the beam coming from the focussing optics into first and second predetermined fractions, the separation means orienting the first fraction towards the first sensor and the second fraction towards the second sensor; control means for controlling a first acquisition time of the scene to be imaged by the first sensor to obtain a first image and/or a second acquisition time of the scene to be imaged by the second sensor to obtain a second image; and merging means that merge the first image coming from the first sensor and the second image coming from the second sensor to generate a final image.

Abstract: A model based method for capturing an improved archival image, including capturing at least two preview images of a scene that are analyzed for scene brightness and motion velocity in the scene. The analyzed data is used to calculate a ratio of pixel signal rate/pixel velocity which is used to select a capture mode, an ISO and an exposure time for capturing the archival image.

Abstract: An image capture apparatus includes an image capture unit configured to capture an image of a subject to obtain image data, an image-capture control unit configured to allow the image capture unit to execute an image capture operation of capturing a plurality of frames of image data having continuity in time so that a frame rate of the image capture unit is changed in accordance with a change of a subject brightness level during the execution of the image capture operation, and a combination processing unit configured to perform a combination process using, as combination-use image data to be combined, the plurality of frames of image data having continuity in time captured by the image capture unit so as to generate combined-image data representing a still image.

Abstract: An imaging apparatus includes an imaging unit operable to capture a subject image to generate image data, a controller operable to calculate a target exposure value based on the image data and control exposure based on a first shooting parameter set by a user to obtain the target exposure value, and a display unit operable to provide a display. The controller calculates a first suitable range which is a range of the first shooting parameter for obtaining the target exposure value, and calculates a second shooting parameter based on the target exposure value and the first shooting parameter set by the user. The display unit displays exposure guide information including the first shooting parameter set by the user, information representing the first suitable range, and the calculated second shooting parameter.

Abstract: Compensation of ambient illumination. A visible image of an object with ambient illumination is captured. Image brightness of at least a portion of said object of said visible image is sampled. A difference between sampled image brightness of at least said portion of said object and a target brightness profile is determined. The difference is compensated for by projecting additional illumination onto said object.

Abstract: A method and camera for electronic image capture provide an electronic image capture device, a scanning aperture shutter located to control light energy received by the image capture device, a flash unit oriented to illuminate an image scene, a photocell unit adapted for sensing visible spectrum energy and infrared spectrum energy received from the image scene, and an exposure control system responsive to the photocell unit and operatively connected to the scanning aperture shutter and the flash unit. The exposure control system is adapted to control an amount of fill flash energy received from the image scene in relation to visible ambient light energy received from the image scene during image capture by illuminating the flash unit once a predetermined amount of ambient visible spectrum energy is sensed by the photocell unit and by extinguishing the flash unit once a predetermined amount of infrared energy is sensed by the photocell unit.

Abstract: An image capture apparatus includes an image capture unit having a plurality of exposure adjustment functions including an electronic shutter function for changing an exposure time within a frame period and configured to capture an image of a subject to obtain image data, and an image-capture control unit configured to allow the image capture unit to execute an image capture operation of capturing a plurality of frames of image data having continuity in time at a fixed frame rate and configured to perform exposure adjustment control in accordance with a subject brightness level obtained during the execution of the image capture operation, the exposure adjustment control being performed using preferentially an exposure adjustment function other than the electronic shutter function.

Abstract: The present invention is an image pickup apparatus including an image pickup device having an image pickup plane on which pixels are two-dimensionally arranged, a mechanical rear curtain shutter that runs along the image pickup plane to control passage/shielding of light, a system control section that divides the image pickup plane into a plurality of pixel groups along the running direction ahead of running of the mechanical rear curtain shutter and collectively resets charge of all pixels in one pixel group sequentially at timing per pixel group according to running characteristics of the mechanical rear curtain shutter, and an image processing section that corrects a signal level of an image signal read from the image pickup device to approximate to an image signal obtained when the pixels have a same exposure time based on the running characteristics of the mechanical rear curtain shutter and reset timing for each pixel group.

Abstract: An image acquisition apparatus includes: an imaging device on which an image of a small area allocated to an area to be imaged is formed; a detection section detecting intensity of light irradiated on the small area from a light source; an integration section integrating the intensity of light detected by the detection section; if an integration value of the intensity of light integrated by the integration section from a point in time when light is emitted from the light source is greater than a predetermined threshold value, a light-source control section terminates light emission; an exposure control section starting exposure of the imaging device before light is emitted from the light source and terminating exposure of the imaging device after emission of light from the light source is terminated; and an image acquisition section acquiring the image of the small area as a divided image from the imaging device.

Abstract: A system and method for capturing images is provided. In the system and method, preview images are acquired and global local and local motion are estimated based on at least a portion of the preview images. If the local motion is less than or equal to the global motion, a final image is captured based at least on an exposure time based on the global motion. If the local motion is greater than the global motion, a first image is captured based on at least a first exposure time and at least a second image is captured based on at least one second exposure time less than the first exposure time. After capturing the first and second images, global motion regions are separated from local motion regions in the first and second images, and the final image is reconstructed at least based on the local motion regions.

Abstract: An imager and a method for real-time, non-destructive monitoring of light incident on imager pixels during their exposure to light. Real-time or present pixel signals, which are indicative of present illumination on the pixels, are compared to a reference signal during the exposure. Adjustments, if necessary, are made to programmable parameters such as gain and/or exposure time to automatically control the imager's exposure to the light. In a preferred exemplary embodiment, only a selected number of pixels are monitored for exposure control as opposed to monitoring the entire pixel array.

Abstract: A surrounding area is imaged onto a detector of a detector device. An optical system produces an imaging beam path and a panel, which is arranged in the imaging beam path, shadows a subarea of the image of the surrounding area on the detector. In order to mask out an object which would dazzle the detector device, while nevertheless being able to monitor the surrounding area, the panel is illuminated in a subarea, and the transmission of the panel in the subarea is reduced by the illumination in the entire frequency range in which the detector is sensitive. The illuminated subarea of the panel shadows the selected subarea of the image.

Abstract: A printing device includes at least one printing engine that has many sensors (first sensors and second sensors) and at least one engine controller operatively connected to the printing engine. The engine controller uses software to control operations of the printing engine. Also, at least one non-volatile memory is operatively connected to the engine controller. The non-volatile memory stores values used by the engine controller to control operations of the printing engine. At least one adapter card is operatively connected to the non-volatile memory and to the first sensors and second sensors. The first sensors correspond to the design of the controller and are items designed as original equipment of the printing device. To the contrary, the second sensors correspond to the design of the adapter card and are items designed to be installed in the printing device after the printing device is in post production, customer service.

Abstract: A method, medium, and apparatus for setting an exposure time is provided. The apparatus includes a section setting module which sets one or more luminance sections based on a luminance distribution of an input image, an image division module which divides the input image into two or more regions, a region classification module which classifies the regions into the luminance sections, and an exposure-time setting module which sets an exposure time for each of the regions with reference to a target luminance value, the target luminance value being set based on the results of the classification performed by the region classification module.

Abstract: An imaging device includes an imaging element, a shutter mechanism, an actuator, a position detector, and a drive controller. The shutter mechanism is switchable between an open and a closed state to control the light incident on the imaging element. The actuator is configured to drive the shutter mechanism. The position detector is configured to detect the time between when the actuator begins storing the driving force and when the shutter mechanism switches from the closed state. The drive controller is configured to direct the actuator to begin storing the driving force while image data is being read from the imaging element, and to control the actuator so as to delay the time when the shutter mechanism is switched from the closed state if the position detector detects that the shutter mechanism is in the first state prior to completion of the image data being read from the imaging element.

Abstract: An image composition apparatus that is capable of acquiring a high-quality composite image that keeps continuity of the gradation of the whole image. Different exposures are set for images to be taken. Each of taken images is divided into small regions. A measured value is found based on brightness values in each of the small regions. A comparison value for each of the small regions is calculated based on the measured value of a small region of one image and the measurement value of the same small region of another image. A representative value is calculated based on the comparison values calculated for the respective small regions. A level-matching gain used for compositing the image data of the images is calculated based on an exposure level difference and the representative value. The image data of the images of which the image levels are adjusted are composited by multiplying the gain.

Abstract: There is provided an image capturing method for use in an image capturing apparatus including an image capturing unit configured to capture an image of an object to output image data. The method includes performing a first position adjustment between the image data obtained under the first image capturing control and the image data obtained under the second image capturing control, thereby calculating a first displacement, performing a second position adjustment between the image data obtained under the second image capturing control and the image data obtained under the third image capturing control, thereby calculating a second displacement, and performing an image composition of obtaining image data representing a composite image, by performing a position adjustment between the image data obtained under the first image capturing control and the image data obtained under the third image capturing control, using the first and second displacements.

Abstract: An image pickup device (100) wherein a target area, on which an exposure control is based, is accurately detected to perform the exposure control most favorably to the target.

Abstract: Automatic exposure adjusting device considers the image on a pixel-by-pixel basis. Each pixel is characterized according to its most significant bits. After the pixels are characterized, the number of pixels in any particular group is counted. That counting is compared with thresholds which set whether the image is over exposed, under exposed, and can optionally also determine if the image is seriously over exposed or seriously under exposed. Adjustment of the exposure is carried out to bring the image to a more desired state.

Abstract: A digital camera and an operating method thereof are disclosed. The digital camera includes an image sensing module, a display, an operating element, and a control module. The image sensing module consists of N pieces of image sensing elements. The display is used to show a first image. The operating element is used by a user to select a specific area in the first image and set correction parameters for the specific area. The control module is connected to the image sensing module and the display for obtaining information about a position of the specific area relative to the first image and the correction parameters, and uses the obtained position information and the correction parameters to control M pieces of the image sensing elements in the image sensing module corresponding to the specific area, so that a second image is obtained based on the correction parameters.

Abstract: A color-unevenness inspection apparatus includes: an image pickup section picking up an image of an inspection target for a color-unevenness inspection; an image generation section generating an uneven-color image by determining one or more uneven-color regions existing in the picked-up image of the inspection target obtained by the image pickup section, and by classifying unit regions included in each of the uneven-color regions into a plurality of color groups; a calculation section calculating, on the uneven-color regions in the uneven-color image, an evaluation parameter to be used in the color-unevenness inspection; a correction section making a correction to the calculated evaluation parameter in consideration of a difference of color-unevenness visibility between the color groups; and an inspection section performing the color-unevenness inspection, based on a resultant evaluation parameter obtained by the correction.

Abstract: A digital camera comprises an image sensor for providing initial sensor image data and final sensor image data; a lens for exposing the image of a scene onto the image sensor; an exposure control system for adjusting an exposure level of a final image on the image sensor in response to a scene type; and a processor for processing the initial sensor image data to select one of a plurality of scene types, and to process the final sensor image data in response to the scene type.

Abstract: Systems and methods are provided for obtaining adaptive exposure control and dynamic range extension of image sensors. In some embodiments, an image sensor of an image system can include a pixel array with one or more clear pixels. The image system can separately control the amount of time that pixels in different lines of the pixel array are exposed to light. As a result, the image system can adjust the exposure times to prevent over-saturation of the clear pixels, while also allowing color pixels of the pixel array to be exposed to light for a longer period of time. In some embodiments, the dynamic range of the image system can be extended through a reconstruction and interpolation process. For example, a signal reconstruction module can extend the dynamic range of one or more green pixels by combining signals associated with green pixels in different lines of the pixel array.

Abstract: An imaging unit obtains image data. An imaging controller controls the imaging unit to obtain a plurality of pieces of image data having different exposure values. A standard image decision unit decides the image data with the shortest length of exposure time of the plurality of pieces of image data as standard image data. A correlation quantity detection unit detects a correlation quantity between the standard image data and the plurality of pieces of image data. A first combination processing unit generates first combined image data by combining the plurality of pieces of image data in accordance with the correlation quantity. A second combination processing unit combines the standard image data and the first combined image data.

Abstract: An image capture device (2) includes a sensor (4) having an active area comprising a plurality of pixels (6) and a shutter array (8) for controlling the exposure of individual pixels. The pixels are grouped in a plurality of pixel subsets and are arranged to capture a plurality of time-separated lo-res images, which can be viewed sequentially as a movie or combined to form a hi-res still image.

Abstract: A method and a circuit for controlling a dynamic image sensor defining, for each image, several successive time intervals of exposure of photodiode cells, starting from successive decreasing reset levels, wherein the time intervals of exposure of the image respect a homogeneous distribution of the amount of cells in ranges of brightness levels.

Abstract: Disclosed are an image sensor and a local binning method in which binning is applied selectively. For example, binning is applied to pixels having low illumination and binning is not applied to non-low illumination pixels. Information on pixels having low illumination for a first image frame may be stored and used to perform binning with respect to areas of a second image frame corresponding to low illumination pixel areas determined with respect to the first image frame.

Abstract: A dark exposure control device comprises a dark exposure performing processor, an aperture-stop, and an aperture-stop driving processor. The dark exposure performing processor detects an image signal generated by an imaging device while the shutter is closed. The aperture-stop adjusts the amount of light incident on the imaging device. The aperture-stop driving processor adjusts the opening degree of the aperture-stop to smaller than the opening degree set for a main exposure while the dark exposure performing processor is operated.

Abstract: A photographing apparatus includes a first photographing device converting incident light from an object through a first optical system to an electric signal, a second photographing device converting incident light from the object through a second optical system to an electric signal, an image signal processing unit generating a first image signal corresponding to the electric signal converted by the first photographing device and a second image signal corresponding to the electric signal converted by the second photographing device, and an exposure control unit controlling a first exposure start time of the first photographing device and a second exposure start time of the second photographing device so that the first exposure start time and the second exposure start time are different from each other.

Abstract: A method for obtaining an image of an actively lit medium (ALM) using a capture device and an illumination source, including: calibrating the capture device for dark signal non-uniformity (DSNU); determining a final exposure value and a final gain value by executing at least one scan of the ALM using the capture device with the illumination source extinguished; and generating the image by scanning, with the illumination source extinguished, the ALM using the capture device set to the final exposure value and the final gain value.

Abstract: Embodiments of the present invention provide a video encoding system in which a video coding engine establishes coding quality metrics that govern its own operation as well as the operation of a camera and/or a pre-processor. An imaging system may include an image acquisition system, a pre-processor and a coding engine. The coding engine may output a quality indicator identifying, for each portion of a video sequence currently being coded, a relatively level of coding quality that is being achieved. The imaging system further may include an image acquisition controller and a pre-processor controller that impose respective operating parameters upon the image acquisition system and the pre-processor in response to these quality indicators. In this manner, overall performance of the imaging system may be improved.

Abstract: An image sensor includes a plurality of pixels, a plurality of sense circuits, and a count circuit. Each sense circuit is configured to read out electrical signals from at least one pixel associated with the sense circuit in order to generate data representing whether or not photons have been received by the sense circuit. The count circuit is in communication with a sense circuit selected from the plurality of sense circuits. The count circuit is configured to provide integration results for the pixels associated with the sense circuits based on the data received from the sense circuits.

Abstract: Several methods and apparatuses for implementing automatic exposure mechanisms for image capturing devices are described. In one embodiment, an orientation detector located in the device determines orientation data for the device. The automatic exposure mechanism projects an orientation vector into an image plane of an image sensor. Next, the automatic exposure mechanism adjusts an initial position of a metering area used for automatic exposure towards a target position based on the projected orientation vector. The automatic exposure mechanism optionally dampens the adjustment of the metering area.

Abstract: The present invention provides a video in which a subject image looks clear while reducing the amount of transmitted data. An image capturing apparatus includes: an image capturing section that successively captures a plurality of images under a plurality of image capturing conditions different from each other; an image generating section that generates an output image by overlapping the plurality of captured images captured under the plurality of image capturing conditions; and an output section that outputs the output image generated by the image generating section. The image capturing section may successively capture the plurality of images by means of exposure in different exposure time lengths from each other. The image capturing section may successively capture the plurality of images also by means of exposure in different aperture openings from each other.

Abstract: Systems, methods, and a computer readable medium for performing an improved blowout prevention process in an image capture device are provided to compensate for occurrences of exposure “blowouts,” i.e., areas in a captured image where pixel brightness exceeds the sensor's dynamic range of capturing capability. In one embodiment, the captured image's histogram may be analyzed to determine if the image is indicative of the presence of exposure blowouts. Once it has been determined that there likely are blowouts in the image, an exposure bias for the image capture device may be set accordingly. Particularly, the exposure value (EV) for the image capture device may be gradually corrected, e.g., by one-eighth of a stop per captured frame, until the image histogram is no longer indicative of blown out regions, at which point the image capture device's exposure value may gradually be corrected back to “normal,” i.e., non-exposure bias compensated, levels.

Abstract: A system, computer readable medium, and method for dynamically setting a camera's exposure parameters based on face detection are disclosed. When taking a picture or video of a person in front of a bright background, standard exposure algorithms tend to overexpose the background. In one embodiment disclosed herein, a face detection algorithm is run on the current picture or video frame, and the exposure metering region is inset over the detected face. Exposure time, gain, or other exposure parameters may be set based on the pixels within the exposure metering region. In another embodiment, the exposure metering region tracks a moving face according to lag parameters so that the exposure metering region remains substantially over the face. In yet another embodiment, a plurality of faces may be tracked, with the exposure parameters set based on a weighted average of the pixels within the plurality of face-containing exposure metering regions.

Abstract: Systems and methods for improving video stutter in high resolution progressive video captured with fast exposure times. In a first approach, digital video is captured with fast shutter speeds that cause each frame of the video to be sharp. A motion blur is not captured for objects moving within the frame. The video codec generates motion information that may be utilized to add an artificial motion blur to each frame of the digital video during processing in a digital video pipeline. In a second approach, the lens assembly of the digital camera includes an electronically actuated filter that attenuates the light reaching an image sensor such that the shutter speeds may be decreased in order to capture motion blur. The electronically actuated filter may be a liquid crystal display (LCD) device that is set to a plurality of different transparency levels based on the voltage applied to the LCD device.

Abstract: It is determined that a dynamic range of an image is to be widened when a subject lightness value is equal to or lower than a lightness value upper limit which is greater than a predetermined lightness value provided that at least either the subject lightness value is equal to or greater than the predetermined lightness value or that an image-capturing frame rate is equal to or higher than a predetermined frame rate. When a determination to widen the dynamic range is made, synthetic image data is generated by combining image data in a plurality of frames captured over varying exposure times. Then, the synthetic image data is displayed or recorded.

Abstract: An image processing apparatus includes a motion-blur adding mechanism performing filter processing on moving image data to be subjected to coding processing in accordance with motion information indicating motion of an image between unit images included in the moving image data as pre-processing of the coding processing so that motion-blur addition processing is performed.

Abstract: An imaging apparatus includes an imaging unit configured to capture an image of an object to acquire image data; a display unit configured to display the image captured by the imaging unit; a motion detection unit configured to detect information about motion of the object and the background in a display image based on image data acquired by the imaging unit; a determination unit configured to determine whether the imaging apparatus is taking a panning shot from a result detected by the motion detection unit; and an exposure control unit configured to execute exposure control to decrease the amount of motion of the object and the background in the display image based on a result detected by the motion detection unit, wherein the exposure control unit executes exposure control based on a result detected by the motion detection unit when the imaging apparatus is determined not to be taking a panning shot by the determination unit and, when the imaging apparatus is determined to be taking a panning shot by the d

Abstract: An imaging apparatus is disclosed. The apparatus includes: a solid-state imaging device provided with a plurality of arranged light-sensitive devices each having sensitivity to light in a range from a visible region to an infrared region; a first filter for transmitting light in the visible region to a first part light-sensitive device out of the plurality of light-sensitive devices; a second filter for transmitting light in the infrared region to a second part light-sensitive device out of the plurality of light-sensitive devices; and a signal processing section for changing a ratio between an electrical signal converted by the first part light-sensitive device and an electrical signal converted by the second part light-sensitive device used as an electrical signal used for deciding exposure in accordance with intensity of the electrical signal converted by the first part light-sensitive device.

Abstract: An image pickup device is equipped with a function to a pickup still picture during a moving picture pickup operation with voices. After a moving picture pickup processing with voices is started (YES in S2), a moving picture recording processing and a voice recording processing are started (S14). Subsequently, when a shutter button is depressed halfway (YES in S16), the moving picture recording processing is switched to a processing to store substitute frames, which are a copy of frame data immediately preceding the half depression operation of the shutter button, instead of moving picture frames imaged in moving picture frame cycles (step S20), and a still picture pickup processing is performed. After the still picture pickup processing ends, the normal moving picture recording processing is resumed.

Abstract: A system and method for capturing images is provided. In the system and method, preview images are acquired and global local and local motion are estimated based on at least a portion of the preview images. If the local motion is less than or equal to the global motion, a final image is captured based at least on an exposure time based on the global motion. If the local motion is greater than the global motion, a first image is captured based on at least a first exposure time and at least a second image is captured based on at least one second exposure time less than the first exposure time. After capturing the first and second images, global motion regions are separated from local motion regions in the first and second images, and the final image is reconstructed at least based on the local motion regions.

Abstract: An apparatus for detecting intensity saturation of a light sensor includes a saturation detector for detecting and measuring an intensity saturation condition of at least one pixel of a light sensor, the intensity saturation condition of the pixel being at saturation upon receiving light with an intensity above a predetermined level, the saturation detector emitting a digital signal with a reserved bit combination indicating the intensity saturation condition of the pixel, and a processor receiving and processing the digital signal from the saturation detector and transmitting a control signal in response to the digital signal to compensate for the intensity saturation condition of the pixel.

Abstract: A camera device is provided with an imager that outputs a long exposure signal and a short exposure signal within one field period; a knee processor that compresses a long exposure signal having the luminance level of a knee point or higher at a compression rate (i.e., decreases an inclination of an incident light amount-luminance level line, representing a variation in a luminance level with an amount of incident light); and a knee controller that adjusts the knee point and the compression rate according to a luminance level of a synthesized signal obtained by synthesizing the long exposure signal and the short exposure signal. In this knee control, the knee point decreases with an increase in the luminance level of the synthesized signal, and the inclination is adjusted to approach an original inclination thereof.

Abstract: Methods and apparatus for capturing and rendering images with focused plenoptic cameras employing different filtering at different microlenses. In a focused plenoptic camera, the main lens creates an image at the focal plane. That image is re-imaged on the sensor multiple times by an array of microlenses. Different filters that provide different levels and/or types of filtering may be combined with different ones of the microlenses. A flat captured with the camera includes multiple microimages captured according to the different filters. Multiple images may be assembled from the microimages, with each image assembled from microimages captured using a different filter. A final image may be generated by appropriately combining the images assembled from the microimages. Alternatively, a final image, or multiple images, may be assembled from the microimages by first combining the microimages and then assembling the combined microimages to produce one or more output images.

Abstract: There is provided a drive circuit of a solid-state image pickup device capable of generating pulse for vertical scanning the interval of which changes non-linearly and pulse other than the pulse for vertical scanning without increasing a circuit size and communication time for setting an electronic shutter. There is provided a drive circuit of a solid-state image pickup device including a polynomial arithmetic operation unit for carrying out an arithmetic operation of first or higher order of polynomial; an arithmetic operation controller of generating a variable of the polynomial to control an arithmetic operation in the polynomial arithmetic operation unit; and a pulse generator of generating a pulse based on a result of an arithmetic operation on a polynomial of the polynomial arithmetic operation unit.

Abstract: Calibrating color (such as adjusting color balance) for an image may include capturing a set of calibration images of a calibration target. The calibration target includes at least one color reference region illuminated by a light source having a distribution of frequencies that cycles over a fixed time period. The calibration images are captured over a calibration period that is greater than or equal to the fixed time period over which the distribution of frequencies cycles. Each of the calibration images is associated to a time identifier. A color balance adjustment is calculated for each of the calibration images, for forming a time-dependent color spectrum model of the color balance adjustments. The color spectrum model models changes in the light source over the fixed time period. In one embodiment, a subject image of a subject is captured for a determined exposure time. In the subject image, the subject is illuminated by the light source. Exposure time data is associated to the subject image.