555 results about "Luminance distribution" patented technology

The video display apparatus has a light modulation device for forming a picture in accordance with a video signal and a lighting unit for irradiating, on the light modulation device, illumination light necessary to cause it to display the picture. In the apparatus, the lighting unit irradiates the illumination light in sequence of individual plural illumination light source partitive areas, a luminance distribution calculating unit calculates luminance distributions of video signals corresponding to the plural partitive areas to determine illumination light luminance levels of the individual partitive areas, an illumination controller controls rays of the illumination light of individual areas of the lighting unit on the basis of determination by the luminance distribution calculating unit, and a video corrector corrects the video signal inputted to the light modulation device on the basis of the determination by the luminance distribution calculating unit.

Fingerprints are bit strings extracted from a media signal (e.g. an audio or video clip) to identify said media signal. Typically, they are derived from a perceptual property of the signal, for example, the spectral energy distribution of an audio fragment or the luminance distribution of a video image. A method and arrangement for extracting a fingerprint is here disclosed which is robust with respect to shifts of the perceptual property. Such shifts occur, inter alia, when the fingerprint is derived from a logarithmically mapped spectral energy distribution of an audio signal and said audio signal is subjected to speed changes. According to the invention, the fingerprint is not derived from the perceptual property as such, but from its auto-correlation function.

Disclosed is an imaging directional backlight including an array of light sources, and a control system arranged to provide variable distribution of luminous fluxes, scaled inversely by the width associated with the respective light sources in the lateral direction, across the array of light sources. The luminous intensity distribution of output optical windows may be controlled to provide desirable luminance distributions in the window plane of an autostereoscopic display, a directional display operating in wide angle 2D mode, privacy mode and low power consumption mode. Image quality may be improved and power consumption reduced.

A plurality of mirror surfaces (5), which extend in a direction (X-axis direction) perpendicular to a light incident surface (2a), are formed side by side in a longitudinal direction (Y-axis direction) of the light incident surface (2a) on a light distribution control surface (4a) of both surfaces (4a, 4b) of a light guide plate (1) in a thickness direction (Z-axis direction) thereof, and a plurality of prisms (7) extending in the Y-axis direction are formed side by side in the X-axis direction in areas other than the mirror surfaces (5). The mirror surfaces 5 are formed in such a way that Y-axis direction widths thereof vary in the X-axis direction. This enables the setting of the light distribution characteristics and luminance distribution of emitted light, which are viewed in two directions, namely a longitudinal direction of the light incident surface of the light guide plate and the direction perpendicular to the light incident surface, to target light distribution characteristics and luminance distribution.

A feature region is extracted from the image region of an object, in accordance with the luminance distribution of pixels adjacent to a predetermined pixel that exists in the image region of the object (S31 to S34). A gravity-center correlation value is calculated, which shows the correlation between the gravity center of the feature region and the gravity center of the image region of the object (S35 and S36). The orientation of the object is determined from the gravity-center correlation value (S37).

A planar light source device includes a first light source for emitting a first light ray having a punctate spatial luminance distribution; a second light source for emitting a second light ray; a first spatial luminance distribution conversion portion for changing the first light ray to a linear spatial luminance distribution; a second spatial luminance distribution conversion portion for changing a spatial luminance distribution of the first and second light rays to a planar spatial luminance distribution; wherein the first light ray is a laser light; the second light ray has a divergence angle larger than the divergence angle of the first light ray when the first light ray is emitted from the first light source; and a slow-axis direction of the first light ray entering the second spatial luminance distribution conversion portion is parallel to an outgoing direction of the planar light.

An image having the image quality desired by a photographer is provided by minimizing overexposure or underexposure, making the dynamic range wide, and specifying an optimum brightness level for a main subject. An image capturing device includes a subject detecting unit which detects a main subject in an image obtained before actual photographing; a subject luminance information acquiring unit which obtains luminance information; a luminance distribution calculating unit which calculates a luminance distribution of each of multiple areas; a target luminance calculating unit which determines a target luminance; a target luminance correcting unit which corrects the target luminance; and an exposure condition determining unit which determines an exposure condition for the actual photographing, in which the target luminance correcting unit includes a criterial range determining unit which determines the criterial range; and a correction amount determining unit which determines a correction amount by using the difference between the target luminance and the luminance of the main subject.

A computer graphics generation system combines video images of a scene captured by a camera with one or more rendered computer generated objects. The system comprises a camera which is arranged to generate an image signal representative of a scene including a reference object of a predetermined shape, and an image processor. The image processor is arranged in operation to identify the reference object from the image signal, to detect a luminance distribution across a surface of the reference object by estimating a luminance magnitude at a plurality of surface points on the surface of the reference object, and to estimate a direction of light incident on the reference object derived from the detected luminance distribution across the surface of the reference object by calculating the average of a plurality of luminance vectors, each luminance vector corresponding to one of the surface points and comprising a luminance magnitude of the corresponding surface point and a luminance direction corresponding to a direction perpendicular to the surface at the corresponding surface point, wherein the luminance distribution across the surface of the reference object is detected for luminance above a threshold clipping level. Accordingly a reduction in the “wobble” of the computer generated objects in the scene can be achieved and a more stable image provided from the image light direction estimation.

Provided is a planar light source device (300) having a planar light source with uniform luminance distribution by using a laser light source for outputting a beam-like luminous flux. The planar light source device (300) applies a laser beam from the side surface of a light guide plate (310) through a scanning mirror (330) and periodically scans the entire light guide plate. At that time, a light output (P(t)) of the laser light source (320) is modulated in synchronization with the scanning cycle so that the output is proportional to the temporal differentiation dS/dt of a scanning area (S(t)) from a search start within a scanning period. Thus, changes of the scanning speed and scanning length with time are eliminated and planar lighting with uniform luminance can be performed.

A video signal processing apparatus includes a characteristic detection circuit for detecting luminance distribution corresponding to one frame of a video signal, a contrast compensation circuit for compensating contrast of the video signal, an edge compensation circuit for compensating an edge portion of the video signal, and a control circuit for determining a luminance range to be controlled on the basis of the luminance distribution detected by the characteristic detection circuit, and controlling the contrast compensation circuit and edge compensation circuit to conduct predetermined compensation on the video signal belonging to the luminance range. The control circuit controls the contrast compensation circuit to increase contrast for the video signal in the luminance range as compared with the video signal in other regions, and controls the edge compensation circuit to make an edge compensation quantity for the video signal in the luminance range smaller as compared with other regions.

Provided is a hollow type planar illuminating device having uniform luminance distribution over the entire light emitting surface. A reflecting surface member (2) is arranged on the bottom side of a hollow unit case (1), a light emitting surface member (3) is arranged on the side facing the reflecting surface member of the unit case, and a space sandwiched between the reflecting surface member and the light emitting surface member of the unit case is permitted to be a hollow light guide space (10). An LED light source unit (5) wherein many LEDs are mounted in a row on a wiring board is arranged adjacent to the both sides or one side of the hollow light guide space so that light is emitted to the hollow light guide space. Between the LED light source unit and an end surface of the hollow light guide space, a light collecting lens (9) is arranged. The light collecting lens reduces the directivity angle of light emitted from the LED light source unit in the device thickness direction. Thus, a hollow type planar illuminating device (30) is formed. The surface roughness (Ra) of the surface of the reflecting surface member (2) facing the hollow light guide space (10) is set to satisfy the inequalities of 1 μm<RA<10 μm.

To provide an image processing system and the like which can more exactly correct the distortion in an image by reducing the influence of color in an area onto which the image is projected, a projector is provided with a correction section which corrects image signals to adjust a distortion of an image; an image projection section which projects an image based on the image signals; a sensing section which senses the projected image to generate sensing information; a luminance-distribution analyzing section which generates coordinate information indicating a peak position which is the brightest position in the sensed projected image, based on the total luminance value for each pixel line forming the sensed projected image based on the sensing information; and a correction-amount deriving section which determines the distortion in the projected image and derives the amount of correction for the correcting section, based on the coordinate information.

The embodiment of the invention discloses a photographing method and a photographing device based on screen light compensation and a mobile terminal. The method comprises the steps of when monitoring that a screen light compensation a photographing event is triggered, controlling a first display area in the middle position of a screen to compensate light with first luminance, and controlling a camera to capture a first image; controlling a second display area in the periphery of a screen to compensate light with second luminance, and controlling a camera to capture a second image, wherein the second luminance is higher than the first luminance; combining the first image with the second image, and then generating a photograph. By using the photographing method provided by the embodiment of the invention, light compensation and image capture are respectively performed on a human face and a background in a framing range, the photograph synthesized according to the two captured images is reasonable in luminance distribution, the photographing effect based on screen light compensation can be effectively improved, and the user experience can be enhanced.

The invention discloses a color fusion method of a night vision low-light image and an infrared image based on color transfer. The present invention first linearly fuses visible light and infrared images to obtain the , , and components of the gray-scale fused image. Utilize the brightness and color distribution of the reference image to adjust the gray-scale fusion image, and adjust the adjusted image data from YUV space back to RGB space to obtain the final color fusion image. The fusion image obtained by the method of the present invention and the color reference The brightness distribution of the image is similar and has a good visual effect.

The present invention relates to a processing method that emphasizes neighboring information around a disparity surface included in a source disparity space image by means of processing that emphasizes similarity at true matching points using inherent geometric information, that is, coherence and symmetry. The method of processing the disparity space image includes capturing stereo images satisfying epipolar geometry constraints using at least two cameras having parallax, generating pixels of a 3D disparity space image based on the captured images, reducing dispersion of luminance distribution of the disparity space image while keeping information included in the disparity space image, generating a symmetry-enhanced disparity space image by performing processing for emphasizing similarities of pixels arranged at reflective symmetric locations along a disparity-changing direction in the disparity space image, and extracting a disparity surface by connecting at least three matching points in the symmetry-enhanced disparity space image.

To provide a plasma display device which implements a peak luminance higher than prior art, reduces the power dissipation, improves the smoothness of gradation display, and conducts clear display suitable especially for TV display. By setting a plurality of APL levels according to the average value of the scene brightness, and by shortening a sustaining pulse period and increasing the number of sustaining pulses of each sub-field in APL levels having small APL, the peak luminance is raised. Further, by making the sustaining pulse period long in APL levels having large APL requiring large discharge light emission power, the light emission efficiency is improved and the maximum power dissipation is reduced. The luminance distribution in the scene when the APL level is small is detected. On the basis of that information, setting of the number of sustaining pulses and the sustaining pulse period is changed in the same APL level. As a result, the peak luminance is increased, and the gradation smoothness in the dark scene is improved.