279 results about "Luminance meter" patented technology

Disclosed is an LCD having an adaptive luminance intensifying function and driving method thereof. A timing controller checks features of externally provided image data, and when they are found to be moving pictures, it determines a luminance level required from the image data and outputs a luminance level control signal, and when they are found to be still images, outputs a predetermined luminance signal. A backlight driver outputs a high-potential backlight driving voltage to the backlight unit when a luminance control signal of high-luminance level driving is provided by the timing controller, and outputs a constant level luminance signal when a constant luminance signal is input. As a result, by selecting a plurality of portions of the displayed screen and tracking and monitoring the changes of the image data, features of the images are defined and application conditions of the luminance intensifying function are determined to control the luminance level of the backlight and outputs of gamma voltage levels. Accordingly, the contrast of a display screen is improved and the power consumption is

A pixel defect detecting and correcting apparatus according to the present invention is provided in which the number of correctable defect pixels is not restricted to the capacity of a memory device and defects subsequently generated can be detected and corrected; and includes a color difference and luminance calculating block 1-2 which calculates the absolute values of the color differences of adjacent pixels and a defect judgment target pixel, and color difference and luminance data; a maximum and minimum data values detecting block 1-3 which detects the maximum and minimum values of various kinds of data based on values calculated from the color difference and luminance; a color difference interpolated value calculating block 1-4 and a luminance interpolated value calculating block 1-5 which obtain the color difference interpolated values and luminance interpolated values of the defect judgment target pixel, respectively; and a defect judgment and interpolation processing block (1-6) which, using a plurality of defect detecting methods, concurrently performs defect judgment of the defect judgment target pixel with respect to each of the defect detecting method and executes interpolation processing according to the defect detecting methods in the case of pixel defects; and an interpolated value for use selecting block (1-7) which selects the final output values of pixels judged to be defective.

A frame rate adjuster is utilized for adjusting a frame rate of a display according to the brightness of a frame. The frame adjuster comprises a frame counting circuit, a brightness-counting circuit, a brightness-determining circuit, and a frame rate selecting circuit. The frame counting circuit is utilized for determining if gray-level data of the frame are all transmitted and accordingly generating a frame trigger signal. The brightness counting circuit is utilized for generating a plurality of brightness-counting numbers according to the gray-level data of the brightness of the frame. The brightness-determining circuit is utilized for outputting a brightness-determining signal according to the frame trigger signal and the plurality of the brightness-counting numbers. The frame rate selecting circuit is utilized for selecting a reference frame rate among a plurality of reference frame rates so as to adjust the frame rate of the display.

The invention relates to a measuring method for colorimetric parameters of an LED display screen. According to the luminescent characteristics of the LED display screen, the method creates and stipulates the measuring steps of color domain coverage ratio, non-uniformity of white field chromaticity and color reproduction of the LED display screen and a calculating method, provides a method for improving the accuracy of measuring and debugging the value and the range of the white field chromaticity and improving the accuracy of measuring primary wavelength of base color, and carries out necessary discrimination to peak wavelength of an LED tube and primary wavelength of an LED screen from scientific concept. A 1980 color luminance meter which conforms to spetral tristimulus values and contains four groups of filter plates is adopted to measure the colorimetric parameters of the LED display screen accurately; by adopting the method, the accuracy of measurement can meet the technical requirements to the standard color luminance meter. A 1980 spectroradiometer with spectral bandwidth and the sampling interval of 1nm can accurately measure the peak wavelength of the LED tube. In the debugging process, a multiturn potentiometer is adopted to achieve the purpose of finely selecting the resistance value of a resistor. The core technology is the necessary premise and key of debugging and manufacturing the LED display screen with excellent color reproduction.

The invention provides an intelligent illumination control system applied to highway tunnels. By utilizing an independently developed illumination controller with a CAN-BUS bus communication interface, all illuminating lamps in a tunnel, a vehicle detector, an inside/outside-tunnel brightness meter and a luminance meter are connected to be a complete control network, and the brightness of tunnel-illuminating lamps can be adjusted from 0 to 100 percent according to the magnitude of traffic flow, the brightness of inside/outside tunnel environments and the contrast degree thereof.

The invention discloses a digital camera-based image brightness meter and a measuring method thereof. The digital camera-based image brightness meter is formed by connecting a CCD camera and a brightness measurement, control and analysis system by using a data wire, wherein the input and output module of the brightness measurement, control and analysis system is connected with a CPU; the CPU comprises an image decoding module, a data correction module for correcting the uniformity of an image field and a brightness computing and analysis module which is used for judging if the RGB channel values of all measured points of a shot scene image to be measured are all in an accurate measurement interval and converting the RGB channel values into brightness values; the CPU is connected with a storage module used for storing an operating system, analysis software, measurement accuracy, a noise change curve, the measured image and a measurement result; and the CPU is also connected with a display module. The brightness meter and the measuring method can improve measurement efficiency and measurement accuracy in an environment of strong light and shade contrast in background, have the advantage of acquiring the brightness data of all parts in a vision field, realize the reading of files in an RAW format and enlarge the linear range of camera measurement.

A system and a method for evaluating a crosstalk of a stereoscopic image display are discussed. The crosstalk evaluation system according to an embodiment includes a display element that alternately display left and right eye images each having an i-gray level and a j-gray level, where “i” and “j” are an integer, a luminance meter sensing luminances of the left and right eye images displayed on the display element, and a computer that calculates a 3D crosstalk at the i-gray level of the left eye image affected by the j-gray level of the right eye image and a 3D crosstalk at the i-gray level of the right eye image affected by the j-gray level of the left eye image based on a luminance information received from the luminance meter while changing the i-gray level and the j-gray level.

The disclosed BRDF measurement method comprises: setting an azimuth circle orbit with support feet and a zenith arc orbit with a movable spectrum amplitude luminance meter, arranging a spectrum irradiation meter. Wherein, when keeping the luminance meter on set position, it measures data to acquire and process to obtain target BRDF. This invention is benefit to improve measurement precision.

A display unevenness correction apparatus for use in the manufacture of an LCD display including an LCD panel having display pixels arranged in rows and columns, the apparatus including: a luminance meter which measures a luminance of the LCD panel while the LCD panel is being illuminated to obtain a luminance; a block luminance calculation unit which segments the luminance map into first blocks and calculate, for each of the first blocks, a block luminance of the first block using luminances included in the first block, the block luminance representing the luminances included in the first block; an interpolation unit which calculates a target luminance for each of the display pixels, using a corresponding one of the block luminances; and a correction gain calculation unit which calculates a correction coefficient for each display pixel using the target luminance.

The invention provides an intelligent illumination controller applied to highway tunnels. The illumination controller can acquire the traffic flow information of a vehicle detector and the brightness information of inside/outside tunnel environments detected by an outside-tunnel luminance meter and an inside-tunnel luminance meter. The illumination controller can drive LED tunnel lamps to be turned on and adjust the light of the LED tunnel lamps. The illumination controller has a CAN-BUS bus communication interface, can form a complete field bus control network in a tunnel, is connected with a management workstation of a tunnel management office through the Ethernet, and can automatically adjust the brightness of tunnel-illuminating lamp from 0 to 100 percent under the management of the workstation according to the magnitude of traffic flow and the contrast degree of the brightness of the inside/outside tunnel environments.

The invention provides a modulated light filtering device for face recognition and a filtering method. The device comprises a controller, a camera, an image acquisition module and an image preprocessing module which are electrically connected, an infrared LED drive circuit electrically connected with the controller and an infrared LED array electrically connected with the infrared LED drive circuit. Near infrared filters are arranged on a camera. Through the modulated infrared LED light supplementary source, infrared ray irradiating on the face is a flashing signal, the luminance signal difference of each pixel point is calculated by comparing the brightness of two images in the bright and dark periods of flashing, and a new image is then produced. The sunlight part in the original image is filtered in the new image. The aim of eliminating the sunlight interference is fulfilled and the performance of face recognition in the outdoor sun is remarkably improved.

A gamma correction method includes displaying a reference pattern on a panel, acquiring first luminance information including a luminance value of each point of the panel by taking an image of the panel using a surface distribution luminance meter, acquiring first correction luminance information by comparing the first luminance information with average luminance information, displaying a gradation pattern on the panel, acquiring second luminance information by taking an image of the panel using the surface distribution luminance meter, correcting and standardizing the second luminance information based on the first correction luminance information, and obtaining a gamma curve from the gradation pattern having the corrected second luminance information.

The invention relates to a tunnel LED illumination control system and method. The control system comprises an outside-cave luminance meter, an inside-cave luminance meter, a traffic flow collector, a vehicle speed detector, a central main control computer, a tunnel field industrial personal computer, a branch control computer and an illumination lamp. The illumination lamp is formed by connecting LED lamps which are connected in a single-loop mode. The outside-cave luminance meter, the traffic flow collector, the vehicle speed detector and the inside-cave luminance meter are connected with the tunnel field industrial personal computer. The tunnel field industrial personal computer is connected with the central main control computer. The tunnel field industrial personal computer is connected with the branch control computer. The branch control computer is in communication with the illumination lamp through a Zigbee wireless network. By means of the system and the method, it is ensured that illumination brightness inside a tunnel is reasonable while electricity is saved, power is supplied to all the LED lamps in a single-loop method, power supply is made reasonable due to Zigbee wireless communication, wiring is saved, and the operating cost of an illumination system of the tunnel is greatly reduced.

The invention discloses an automatic aperture control device and an automatic aperture control method of a full HD (High-Definition) camera. The automatic aperture control device comprises a CMOS (Complementary Metal Oxide Semiconductor) sensor, an operation module and auxiliary equipment which are connected in sequence. The operation module comprises a frame brightness calculated value calculation module, an actual brightness value calculation module and a brightness difference calculation module, and is used for removing the brightness gain from the brightness calculated value of the frame and calculating the actual brightness value of the frame for aperture control. With the device and the method, the influence of the exposure and the gain value in the CMOS sensor on the aperture control is eliminated, the aperture control is accurate, the implementation method is simple and the cost is reduced.

The invention provides a display contrast calibration method and device under the high luminance environment. The high luminance environment is simulated through a collineation light source, a mirror plane light source, a diffusion environment light source and a diffusion integrating sphere light source. With the cooperation of mechanical displacement mechanisms of a display measurement table, a luminance meter platform and the like, the contrast of a display can be calibrated and measured under multiple complex illumination conditions with high luminance. By the adoption of the scheme, a standard reflecting plate is additionally arranged on a display fixing platform, a measurement result of the calibration device is calibrated by utilizing the calibrated and verified standard reflecting plate, value traceability is conducted on a contrast parameter of the display through the device, and it is ensured that the measurement result has excellent repeatability and stability.

The invention relates to a method for generating a signal for measuring a left and right eye crosstalk value, and the method comprises the following steps that at least two brightness values are selected first; the two brightness values are lined, and a crosstalk source signal with background brightness and light and dark stripes is formed; then a signal subjected to crosstalk is generated according to the crosstalk source signal; the brightness value of the background brightness of the crosstalk source signal is selected as the background brightness of the signal subjected to crosstalk; and at least one crosstalk value is selected, and the brightness values of the light and dark stripes of the signal subjected to crosstalk are calculated according to the crosstalk value. In addition, the invention also provides a method for measuring the left and right eye crosstalk value through the crosstalk source signal and the signal subjected to crosstalk. The technical scheme of the invention provides the direct-reading crosstalk value measuring method and the method for generating the testing signal required for the measuring method. No brightness meter and other auxiliary tools need to be adopted, meanwhile the requirements on the measurement environment are reduced, and a measuring process can be completed not necessarily in a darkroom environment. According to the method for generating the signal for measuring the left and right eye crosstalk value and the method for measuring the crosstalk value, a testing operation process is simplified, and the crosstalk value can be read intuitively and quickly without a lot of complicated calculation.

The invention discloses a testing method for a light spread function template of an LED zone backlight. The method adopts a liquid crystal display capable of dimming dynamically in zones, a chroma luminance meter, a computer and a two-dimensional motion tripod head and comprises the following steps: specific luminance of zone backlight of each LED is set; the practical luminance of each zone on an LCD panel, corresponding to the zone backlight, is tested with the chroma luminance meter; the tested practical luminance data is correspondingly plugged into an automation solution program MATLAB in a computer to obtain an equation set of light spread function template parameters; the light spread function template parameters are solved eventually. The testing method has the advantages as follows: the method is wide in application range; an LED backlight source can be a direct light type source positioned below a backlight module or a side light type source positioned on a side of the backlight module, and can be variable forms positioned at all zone backlight source positions; a testing hardware system is simple in structure, convenient in construction and strong in operability; a MATLAB program is adopted for automation solution, so that the computing speed is high, and the precision is high.

A battery powered electronic appliance, including a first device, a visual display and a camera device having a camera sensor that is configured to sense ambient light in the environment of the electronic appliance; an ambient light measurement module coupled to the camera sensor that is configured to measure the sensed ambient light to produce an ambient light value that indicates a measured level of ambient light; and a light control module that is configured to determine a level of illumination of the visual display based on the ambient light value.

The invention discloses a tunnel illumination intelligence control system and a control method. The tunnel illumination intelligent control system comprises an outside-tunnel luminance meter, an inside-tunnel segment luminance meter, a radar vehicle detector, a tunnel lamp, a light adjustment controller, a segment main controller and an upper computer. The outside-tunnel luminance meter, the inside-tunnel segment luminance meter, and the radar vehicle detector are in wireless communication with the segment main controller through a ZigBee module and transmits an outside-tunnel brightness value, an inside-tunnel brightness value, a vehicle speed and a traffic flow to the segment main controller; the segment main controller is in wireless communication with the light adjustment controller through the ZigBee module and is in wireless communication with the upper computer through a GPRS module; and the segment main controller controls the light adjustment controller to adjust the working state of the tunnel lamp according to a light adjustment control order transmitted by the upper computer. The invention realizes stepless light adjustment without unnecessary electric energy waste, creates good tunnel vision environment, and reduces the wiring waste. The transmission signals are not affected by the continuity of the circuit, which is easy to control and operate.

The invention discloses a blue light detecting method for a medical display device. The method comprises the following steps: an image generating module provides a test image with the image resolutionup to a pixel level for a medical display device; and a spectral radiation luminance meter module is used for measuring red-green-blue three-primary-color spectrum data of the medical display deviceand upper computer software analyzes the degree of blue light radiated by the medical display device according to the spectrum data. Meanwhile, the invention provides a comprehensive blue light hazardevaluation method for a medical display device with three physical indicators of a blue light hazard weighted radiance value LB, a blue light hazard efficiency value KB, V and a rhythm factor KC so as to overcome defects of blue light measurement and objective evaluation of the medical display device. Besides, the invention also provides a blue light detecting apparatus for a medical display device pixel level, thereby realizing the high-precision measurement and accurate evaluation of blue components of a pixel-level test screen of a medical display device.

The invention discloses a method for measuring brightness outside a highway tunnel. The method includes the steps that A, the relation between brightness values of scenes outside the highway tunnel and the illumination value of the horizontal plane is determined, and a brightness meter and an illuminometer are used at the position away from a tunnel portal by a safe stopping sight distance for reading at the same time and obtaining brightness values L of scenes of the tunnel portal and the illumination value of the horizontal plane E; B, the computation standard value of brightness of the scenes outside the highway tunnel is determined, and the hourly total illumination and scattering illumination of regions in a typical meteorological year are obtained through radiation observational data and radiation light equivalent models of the regions; C, the area percentage of the scenes outside the highway tunnel within the view field of the cone angle of 20 degrees is determined, and the border line of the view field of the cone angle of 20 degrees of a driver at the position away from the tunnel portal by a stopping sight distance is drawn out on each picture of the tunnel portal; D, the value L20 (S) of brightness outside the highway tunnel is determined according to an environmental diagram method. The method is easy to implement, easy and convenient in operation, accurate and reliable in measurement result, and capable of being widely applied to measuring the brightness outside existing highway tunnels.

A luminance compensation system of a display device and a luminance compensation method thereof are disclosed. The luminance compensation system includes a display panel including a plurality of pixels, a TFT and an OLED, a luminance meter configured to measure luminance at a plurality of positions and obtain a plurality of measure values for each of the plurality of positions in a state where modeling voltage patterns are applied to the plurality of positions, a first modeling unit configured to model the plurality of measure values to derive a first luminance characteristic approximate equation, and a second modeling unit configured to obtain a luminance error between the measure value and a luminance value in accordance with the first luminance characteristic approximate equation, after calculating an offset correction parameter, and apply the offset correction parameter to the first luminance characteristic approximate equation to derive a second luminance characteristic approximate equation.