66results about How to "Accurate white balance" patented technology

There is disclosed a constitution in which an area with strobe light rays dominant therein, which corresponds to strobe light dominant area, is extracted in accordance with various extraction conditions, and a white balance adjustment suitable for a property of the area is set in order to enhance a result of an indoor strobe photographing. Moreover, it is judged whether or not correction is appropriate for each white balance area in accordance with a result of evaluation exposure of a steady light amount.

An imaging device is configured to include an optical system which captures an image of a subject, an image sensor which converts the image captured by the optical system into an electric signal, a classifying unit which classifies the captured image into a plurality of areas according to brightness information and color information, a white balance correcting unit which set different white balance correction coefficients for the plurality of areas; and a white balance correction coefficient adjusting unit which adjusts a difference in the white balance correction coefficients for the plurality of areas to be within a first predetermined range.

A database obtained based on the photoelectric conversion characteristics for R and G signals and a database obtained based on the photoelectric conversion characteristics for G and B signals are stored in LUTs respectively. Signal value calculators read out the databases from the LUTs respectively and perform white balance processing on the R and B signals respectively.

A photographing apparatus provided with a picture-taking device which photographs a subject, includes a transmission type chart to be attached to the photographing apparatus and having at least a chromatic color portion; a storage device which stores a color reproduction target value for the chromatic color portion of the chart; and a correction device which corrects a color correction coefficient of image data obtained by photographing by the photographing apparatus, on the basis of image data obtained by photographing an achromatic color portion of a subject by the picture-taking device through the chromatic color portion of the chart and on the basis of the color reproduction target value stored in the storage device.

A first white balance correction value is computed by detecting white pixels from an image. A determination is made as to whether or not a corrected image signal in the face region falls into a second color signal region surrounding a first color signal region that represents a skin color if white balance of the image signal in the face region is corrected based on the first white balance correction value. When it is determined that the corrected image signal of the face region falls into the second color signal region, a second white balance correction value for correcting the image signal is computed based on relationships between the corrected image signal of face region and the first color signal region. The computed second white balance correction value is modified based on information obtained when the image was captured.

A digital still camera has a function to perform first and second exposures in a single imaging sequence. In the first exposure, imaging conditions are determined to obtain proper exposure amount of the background with available light. Then, the second exposure is carried out with the flashlight to illuminate the main subject. The photographic sensitivity, the shutter speed, and the aperture value for the second exposure are determined such that the exposure value in the second exposure is under-exposure by two steps or more, compared to that in the first exposure. Images obtained by first and second exposures are synthesized to obtain a composite image.

An image pickup apparatus which can carry out proper white balance adjustment even at the time of bounce flash shooting. A white balance adjusting circuit uses a first correction value calculated based on shot image data as a white balance correction value when it is detected that no light has been emitted from the light emitting device, and uses a second correction value for shooting with light emission as the white balance correction value when it is detected that light has been emitted from the light emitting device. The white balance adjusting circuit uses a third correction value different from the second correction value as the white balance correction value, when a white balance photography determining section detects that the bounce flash photography has been carried out.

It is difficult properly to perform correction processing such as white balance adjustment and exposure compensation for all types of images. This invention provides a way in which white balance adjustment and exposure compensation are performed in accordance with image features by considering the arrangements of pixel values in the highlighted and shadow areas of an image. Proper correction processing can therefore be performed for any types of images.

A digital still camera has a function to perform first and second exposures in a single imaging sequence. In the first exposure, imaging conditions are determined to obtain proper exposure amount of the background with available light. Then, the second exposure is carried out with the flashlight to illuminate the main subject. The photographic sensitivity, the shutter speed, and the aperture value for the second exposure are determined such that the exposure value in the second exposure is under-exposure by two steps or more, compared to that in the first exposure. Images obtained by first and second exposures are synthesized to obtain a composite image.

A laparascope and endoscope cleaning and de-fogging device with a port located horizontally that is used to warm the scope prior to insertion into the body cavity / surgical site. The scope punctures the initial membrane and enters the cavity between two bodies of absorbent material that contain fluid. The absorbent material is arranged such that the passage of a scope would be accommodated for different sizes of surgical scopes. A circuit board is located on the bottom of the chamber that has a design element used to warm the liquid to a temperature equal to or greater than the temperature of the proposed surgical environment. When the scope is located between the two absorbent bodies, the heat generated by the circuit board is transferred via the liquid and contacts the scope, warming it in preparation for surgery.

The invention discloses a white block hypothesis based automatic white balance method of a digital camera device. The white block hypothesis based automatic white balance method comprises obtaining a raw image of a standard white color code plate through the digital camera device to be calibrated and dividing the obtained raw image into M*N division blocks; calculating average values of an R channel, a G channel and a B channel of every division block and obtaining the current gain; finding a definition area of the standard white under every color temperature; dividing an image to be corrected into M*N division blocks, determining whether the gain of every division block is contained in the definition area or not in turn and performing color correction on the integral image through a default value if the gain of any division block does not fall into the definition area range; accumulating the gain and the weight of the division blocks which fall into the definition area otherwise; dividing an obtained accumulated value by a weight value corresponding to every division block respectively to obtain the gain of the image to be corrected; achieving the automatic white balance correction through the gain. The white block hypothesis based automatic white balance method of the digital camera device is high in robustness and accurate in white balance.

An image pickup apparatus includes an image pickup unit that acquires a first image without a flash and a second image with the flash; a down-sampling unit that generates a third image by down-sampling the second image; a brightness difference calculator that calculates a brightness difference between the first image and the third image; a flash reflection intensity calculator that calculates a first flash reflection intensity from the brightness difference; and a white balance gain calculator that calculates a white balance gain based on the first flash reflection intensity. An image pickup method includes acquiring a first image without a flash and a second image with the flash, generating a third image by down-sampling the second image, calculating a brightness difference between the first image and the third image, calculating a first flash reflection intensity from the brightness difference, and calculating a white balance gain.

In an image pickup apparatus, a particular color signal is extracted from an input video signal based on the selected image taking mode information, white balance control amount calculating means calculates a control amount based on the extracted video signal of the particular color, the white balance correcting means corrects the white balance of the video signal according to this control amount, and then the color correcting means corrects the particular color signal in the video signal based on color correction parameter values set in advance. Subsequently, low chroma color suppression processing means corrects the gain amount of the video signal corresponding to the predetermined area centered at the origin in the color difference plane, from among the video signal corrected by the color correcting means, thereby correcting the particular color in the video signal and also correcting white balance deviated due to the correction of the particular color.

The invention relates to a method for correcting white balance and relative system. Wherein, it recognizes target image or downloads the mixed light source of sampled image; based on the information of single light source of mixed light source, it obtains the correct parameter of mixed light source; based on the correct parameter, it corrects the target image to obtain the first image; based on the information of pixels of first image or downloaded sampled image, it obtains the correct parameter of each color component, and based on the correct parameter of each color component, it corrects and outputs the first image. The invention can obtain accurate white balance and the image with high quality.

A first white balance correction value is computed by detecting white pixels from an image. A determination is made as to whether or not a corrected image signal in the face region falls into a second color signal region surrounding a first color signal region that represents a skin color if white balance of the image signal in the face region is corrected based on the first white balance correction value. When it is determined that the corrected image signal of the face region falls into the second color signal region, a second white balance correction value for correcting the image signal is computed based on relationships between the corrected image signal of face region and the first color signal region. The computed second white balance correction value is modified based on information obtained when the image was captured.

A segmented imaging sensor having plural output pipelines in correspondence to the number of segments. Discontinuities between segments of the electronic imaging sensor are reduced by providing duplicated pixel values for pixels in an overlap region between segments, and by providing the duplicated pixels to processors that process the output from pipelines whose segments border on the overlap region.

There is provided a method of performing auto white balance including: setting a plurality of sections of a whole range of a value of each of Y, Cb, and Cr in the YCbCr color space, according to a size of each value; calculating an accumulated Y, Cb, and Cr value of pixels included in each of the plurality of sections; determining effective sections according to the number of the pixels included in each of the plurality of sections; calculating a mean Y, Cb, and Cr value of pixels included in all of the effective sections by using the accumulated Y, Cb, and Cr value of each of the effective sections; calculating a mean RGB value by converting the mean Y, Cb, and Cr value into an RGB color space; and determining an RGB color gain of a Bayer image outputted from an image sensor by using the mean RGB value.

A method and system for additively, manually sequentially or manually in parallel, selecting multiple points or regions of interest in the analog or digital viewfinder of a photo or video camera with automatic controls like auto-focusing, auto-metering and auto white-balancing. Points or regions capable of being selected, within a grid of elements comprising a camera's evaluative matrix and represented to the user in a viewfinder or other display, may be hard-coded (pre-defined, selectable regions) or any point, pixel, or group of pixels. Data from the selected regions is used to simultaneously, dynamically adjust focus related parameters, light metering and white balancing of the camera and is tied into these features. Point selection may be via touch screen or by holding down a lock button. The selected points or regions may be applied to focus and aperture related adjustments or for any other camera function related to measurement of the scene.

A pixel structure includes a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel. The red sub-pixel, the green sub-pixel and the blue sub-pixel are suitable for providing a first white light, and a chroma coordinate of the first white light is (x1, y1). The white sub-pixel is suitable for providing a second white light, and a chroma coordinate of the second white light is (x2, y2). The chroma coordinate of the first white light is different from the chroma coordinate of the second white light, that is, (x1, y1)≠(x2, y2), while x2≧x1 and y2≦y1.

White balance correction is performed on RGB color signals output from an image pickup device that includes a particular color filter array in which RGB color filters are arranged on respective lines and the ratios of the numbers of RGB color filters are different between the lines. For calculation of WB gains used for the white balance correction, not all the pixels of the image pickup device but prescribed lines are used to thinning-read. The WB gains are calculated based on color signals on the thinning-read prescribed lines. As the prescribed lines to be thinning-read, lines having a small degree of color mixture are selected under an imaging condition (a lens f-number and a zoom position) with a high degree of color mixture; lines having relatively even ratios of the numbers of RGB color filters are selected under an imaging condition having a low degree of color mixture.

An image processing apparatus for performing a white balance correction for RAW data obtained by an image capturing unit, includes a storage, operable to store a RAW file to which the RAW data and developed data obtained by performing a development processing to the RAW data are attached, and a corrector, operable to perform the white balance correction for the RAW data based on the developed data stored in the storage.

In a liquid crystal display device, the reduction of power consumption is realized by reddening a backlight while maintaining a white balance. An aperture ratio of a red subpixel and an aperture ratio of a blue subpixel are set such that, in a state where an aperture ratio of a green subpixel in each pixel of a liquid crystal panel is fixed to a desired value, white brightness efficiency takes a maximum value which is set based on a balance between light emission efficiency which is increased corresponding to lowering of a color temperature of the backlight and transmissivity of the pixel which is decreased corresponding to the increase of the aperture ratio of the blue subpixel.

A calculation method for calculating a white balance correction value is disclosed. When an image capture device utilizes an auxiliary light to capture an image, the weightings of the image color impacted by the color temperature of each light source are obtained by the brightness-rate which is provided by the environment light and the flash, and then the weightings of the color temperatures of the two light sources are balanced to obtain a white balance correction value. At last, the white balance correction value is applied to correct the white balance of the image.

An imaging apparatus has: a white balance control circuit for detecting an achromatic portion of an image of an object and controlling gains of the chrominance; an object distance detecting circuit for detecting a distance to the object; and a zoom value detecting circuit for detecting a zoom value of the optical system. The imaging apparatus further has: an object brightness detecting circuit for detecting brightness of the object; and a white balance control amount adjustment value setting circuit for forming a white balance control amount adjustment value to adjust a control amount in the white balance control circuit on the basis of object brightness information, object distance detection information, and zoom value information, wherein the white balance control amount is adjusted on the basis of the white balance control amount adjustment value.

The invention discloses a display screen calibration method, a display screen calibration system and a computer readable storage medium. The display screen calibration method comprises the steps of pre-storing calibration data corresponding to different temperatures; monitoring the temperature of a display screen in real time through a temperature sensor; acquiring the corresponding calibration data according to the temperature; and performing calibration on the display screen according to the calibration data. According to the invention, the LED display screen can be ensured to display uniformly at different temperatures, so that a problem that the LED display screen is increasingly severe in color cast along with the rise in temperature is improved, the white balance is kept to be accurate, the color is true to life, the image is accurately restored, the LED display screen is enabled to continuously keep the excellent display effect, and good visual appreciation effect of customers is ensured.

A license plate image-pickup device and an image white balance adjustment method thereof applicable to vehicles. The license plate image-pickup device comprises an image-sensing module, a recognition module, a data base and a processing module. The image-sensing module senses a scene to produce an image.The recognition module recognizes an object contained in the image and a license plate color feature contained in the object to produce recognition parameter set. The database saves parameter sets of reference objects and reference license plate color features respectively corresponding to the reference objects. The processing module searches the reference objects in the database according to the recognition parameter set, to obtain a corresponding reference license plate color feature, and adjusting the white balance of the image according to the corresponding reference license plate color feature.

The invention discloses a method of adjusting white balance, which is applied to electronic equipment. The method comprises steps of acquiring information of N profiles of M image objects of a to-be-corrected image, acquiring N white balance correction parameters of N image objects corresponding to information of N profiles in the M image objects on the basis of the information of N profiles, and carrying out white balance correction processing on the N image objects according to the N white balance correction parameters, wherein both M and N are integers no less than 2, and N is smaller than or equal to M. In addition, the invention also discloses the electronic equipment corresponding to the above method of adjusting white balance.