191 results about "Black point" patented technology

A backlit display with improved dynamic range.

A backlit display with improved dynamic range.

A method corrects a color image by avenging at least two color channels in regions near the minimum of histograms of the at least two color channels; selecting the smallest of the avenge color values as a black point; averaging at least two color channels in regions near the maximum of the histograms of the at least two color channels and selecting the largest of the avenge color values as the white point; and correcting the at least two color channels by adjusting the smallest and the largest color averages to respectively match the valves of the black point and the white point to form corrected image data. A preferred method limits the adjustment to a predetermined amount of clipping of the at least two color channels.

A vehicle environment monitoring apparatus capable of extracting an image of a monitored object in an environment around a vehicle by separating the same from the background image with a simple configuration having a single camera mounted on the vehicle is provided. The apparatus includes a first image portion extracting processing unit to extract first image portions (A1, A2) considered to be the head of a pedestrian from a currently picked up image and a previously picked up image by an infrared camera, a mask area setting processing unit to set mask areas (M1(0,0), M1(1,0), . . . , M1(5,8)) around the first image portion (A1) in the currently picked up image, and an object extracting processing unit to carry out pattern matching for the previously picked up image by a comparison pattern obtained through affine transformation of each mask area at a change rate (Rate) between the first image portions (A1, A2), and to set an area (Ar1) including the first image portion (A2) and a second image portion (M2(1,3), M2(2,3), . . . , M2(3,6)) where a displacement amount between the position (black point) corresponding to the centroid of the mask area and the matching position is smaller than a predetermined threshold value to be an image area of the monitored object.

The embodiment of the invention discloses a method and a device for detecting internal dust of a liquid crystal screen. A horizontally arranged liquid crystal screen is vertically illuminated by parallel light from bottom to top; the liquid crystal screen is lighted to show a white image; an image acquiring device positioned above the liquid crystal screen is used for acquiring an image of the liquid crystal screen for the first time and recording coordinates of black points in the image. An auxiliary polaroid parallel to the liquid crystal screen is transferred to a position between the image acquiring device and the liquid crystal screen, and the polarization angle of the auxiliary polaroid is enabled to be vertical to that of a polaroid arranged on the liquid crystal screen. The liquid crystal screen is regulated to a black image; at one side end of the liquid crystal screen, a region between the polaroid on the liquid crystal screen and the auxiliary polaroid is illuminated by diffused light, and the image acquiring device is used for acquiring the image for the second time and recording the coordinates of bright points in the image. Whether dust exists inside the liquid crystal screen or not is determined according to the quantity of overlapped coordinates of the bright points in the image acquired for the second time and the black points in the image acquired for the first time. The method and the device disclosed by the invention have the advantage of greatly reducing the false detection rate of detection for internal dust of the liquid crystal screen.

In a liquid crystal display device having a feedback circuit part, the feedback circuit part prevents black points and blinking pixels from being generated on a liquid crystal display panel by compensating ripple voltages generated from a common electrode of a common substrate. The feedback circuit part comprises a negative feedback part, a buffer part, a low-pass filter part, and first and second impedances interconnecting the low-pass filter part and the negative feedback part.

A brand new lattice two-dimensional code solves the problems of limited coding capacity and poor safety anti-counterfeiting property of an existing two-dimensional code. The brand new lattice two-dimensional code is formed by splicing a plurality of different code graphs corresponding to the same code; each code graph is formed by distributing adjustable solid round points or square points with the same size on rectangular arrays of which the spacing is adjustable and which are arranged at an equal interval; each code graph consists of a location zone 1, key zones 2.1 and 2.2, and a data zone 3 containing a single-place CRC check code zone 3.1; the positions of black points in the data zone respectively represent all places of a code expressed by a decimal number and numbers in the range of 0 to 9 in the check code; an original data zone array image is scrambled by scramble transformation; a number of corresponding scramble times is a password; and a plurality of previous scramble arrays with the highest scramble degrees are used as final data zone arrays of the code graphs. The two-dimensional code solves the contradiction between high coding capacity and high point density, has high capacity and good concealment, is easy in expansion and strong in safety anti-counterfeiting property, and is especially suitable in the field of logistic monitoring, product source tracing, audio books and the like.

The invention relates to a fluorinated weather-resistant film for a solar photovoltaic battery back plate and a preparation method of the fluorinated weather-resistant film, belonging to the technical field of solar photovoltaic generation. The fluorinated weather-resistant film is used on a packaged material back plate of a solar photovoltaic battery component so as to protect the battery component from being eroded by water vapor and preventing the oxidization of oxygen. The formula of the fluorinated weather-resistant film comprises the following materials in parts by weight: 61-78.8 parts of fluorinated resin, 5-20 parts of inorganic filler, 5-8 parts of processing aid, 0.1-0.5 parts of lubricant and 0.1-0.5 parts of antiblocking agent, and can further comprise 0-20 parts of flow modifier. In the invention, the fluorinated weather-resistant film for the solar photovoltaic battery back plate is prepared by adopting an extruding and film-blowing method. The prepared fluorinated weather-resistant film is flat, is easy to wind and rewind, has fewer black points, and simultaneously has obvious mechanical performance, especially high tearing strength and balanced longitudinal and horizontal performances. The film is not shrunk at the temperature of 120 DEG C. The transmissivity of water vapor of the single-layer film is low.

The invention provides zinc oxide ink and a preparation method thereof, an electron transmission membrane layer and a display device. The zinc oxide ink comprises ligand-loaded zinc oxide nanoparticles; a ligand adopts an aliphatic chain longer than two carbon atoms. According to the zinc oxide ink provided by the invention, the zinc oxide nanoparticles adopt the ligand with the chain length greater than the two carbon atoms; compared with zinc oxide nanoparticles which take ethanolamine (with the ligand chain length equal to the two carbon atoms) as the ligand in the prior art, the steric hindrance between the zinc oxide nanoparticles is increased, so that the zinc oxide nanoparticles are not aggregated, and furthermore, a condition that a black point is formed in a membrane layer formedby the zinc oxide ink is avoided; meanwhile, the ligand has a self-crosslinking property, and a network-shaped structure is formed by self-crosslinking; a condition that relatively more holes are formed in the membrane layer, caused by the fact that a solvent of a printing membrane layer is volatilized too fast, is avoided, and the quality of the membrane layer formed by adopting the zinc oxide ink is ensured.

An apparatus sets a chromaticity point serving as a gray reference in a color gamut of a color space that an output device is able to output, specifies, in the color gamut of the color space that the output device is able to output, a first minimum lightness point on a lightness axis of the set chromaticity point and a second minimum lightness point that is achromatic, and generates a gray line that passes through a black point that is a minimum lightness point on a line connecting the first minimum lightness point and the second minimum lightness point, the first minimum lightness point, and the set chromaticity point and reaches a white point in the color gamut of the color space that the output device is able to output.

A method for dynamic range adjustment of image data of a captured image by determining a white point of an image. The method also involves determining a black point of the image, classifying pixels of the image, and determining an offset value for a pixel of the image based on the determined black point of the image and the determined classification of the pixel. Dynamic range adjustment of the image data is performed using the determined offset value for the pixels of the image and the determined white point of the image.

This invention has as its object to provide a color separation table generation method which can improve grayscale characteristics and can suppress generation of a pseudo edge of a reproduced image by introducing a nonlinear interpolation method using a finite element method. To this end, according to the present invention, a color separation table generation method of generating a color separation table used to separate an input color into a plurality of color agent colors, includes: a first table generation step of generating color separation data on a first line that connects white and black points in the color separation table; a second table generation step of generating color separation data on a plurality of second lines each of which connects the white point and each of primary color points each expressed by one of the color agent colors and secondary color points each expressed by two of the color agent colors; a third table generation step of generating color separation data on a plurality of third lines each of which connects each of the primary and secondary color points and the black point; a fourth table generation step of generating color separation data on a plurality of fourth lines each of which connects the primary and secondary color points; and an interpolation step of generating color separation data at grid points inside a three-dimensional color space by an interpolation process based on the color separation data on the first to fourth lines, wherein the interpolation step includes a step of executing an interpolation process using a finite element method for each triangular plane specified on the color space.

The invention discloses a road accident dark spot identification system based on a system safety index distribution method. The system comprises a history accident data recording unit, a system safety index recording unit, a dark spot identification unit and a dark spot identification result output unit. The system safety index method comprehensively takes consideration of history accident data correlative in space positions on a target road, calculation is simple, only system safety indexes on a road segment node need to be calculated, road segment units are needless to be divided, the occasion that in a traditional dark spot identification method, the road segment units must be divided first is eliminated, meanwhile the space correlation of the history accident data is taken into consideration, and results are precise.

The invention discloses a method of recovering a polyimide raw material by hydrolyzing a polyimide waste thin film by ammonia water, and relates to ammonia water hydrolysis of a waste polypyromellitimide thin film and a recycling method of a hydrolyzed product pyromellitic acid. The concentration of ammonia water is 25-30wt%, the content of the waste thin film in the ammonia water is 20wt%, and the sublimation conditions of 4, 4'-diaminodiphenyl ether are that the temperature is 190-192 DEG C and the pressure is 0.2-0.3mmHg. The purity of the product is 99.9%, and the melting point is 192-193 DEG C. The pyromellitic acid is dehydrated for 2-3 hours at 250-260 DEG C at 100mmHg to remove about 10wt% of water, so that almost part of the pyromellitic acid is converted into pyromellitic dianhydride, wherein the sublimation conditions of the pyromellitic dianhydride are that the temperature is 250-260 DEG C, and the pressure is 0.2-0.3mmHg. The product is free from small black points, the purity is over 99.5%, and the melting point is 286-287 DEG C.

The present invention is to provide an image processing system and the method thereof capable of maintaining gradient characteristics near a black point of an output image, when performing color matching in a color printer, even if a source profile has a lower minimum lightness value of output color gamut. In the present invention, when a condition is matched by comparing the minimum lightness points of the source profile and output color gamut, a correction color conversion table is generated by correcting the minimum lightness point of the output color gamut to a correction target value set in advance. Color conversion is performed for an input image using the correction color conversion table.

The invention discloses a method and system for measuring distortion of a lens. The method comprises the steps that a testing card provided with a dot matrix composed of K*N points is set, wherein K and N are natural numbers, and K is equal to or not equal to N; a distortion image produced after the lens is distorted is obtained through the testing card; the point at the top left corner of the distortion image is the origin of coordinates, and a plane coordinate system of the distortion image is established with the rightward direction of the origin of coordinates as the forward X-axis direction and the downward direction of the origin of coordinates as the forward Y-axis direction; the coordinates of the center point of the distortion image and all non-center points are scanned, retrieved and positioned, and the coordinate values of the center point and all the non-center points in the plane coordinate system are determined; the distortion amount of the distortion image is calculated according to the coordinate values of the center point and all the non-center points and the distortion amount calculating formula of the distortion image, and therefore the distortion amount of the lens is obtained. The method and system can rapidly and accurately position black points of the testing card, and the measuring precision of the lens distortion is improved while the image processing speed is improved.

The invention provides a camera module multi-point parameter automatic detection device and relates to the technical field of camera module test devices, solving the problems of low camera test efficiency and no quality assurance. The detection device comprises a cabinet; the cabinet is provided with a detection device therein; the detection device comprises a base plate, a rotating disk mechanism, an OTP burning test mechanism, a far focus defect pixel test mechanism and an AF test mechanism which are arranged on the base plate; four stations of the rotating disk mechanism are provided with Dothinkey boxes which are provided with module fixtures; the Dothinkey boxes are connected to a system host computer. Only one time of artificial material feeding is required, then the LED lightening test, OTP burning test, far focus test, defect pixel test, vignette test, black point test, white point test, and AF test can be carried out automatically; manual test are replaced, productivity is increased, product quality is guaranteed.

The invention discloses a manufacturing method of dry-pressed anisotropic ferrite magnetic powder which is uniformly dispersed and has effectively improved BH max. The manufacturing method comprises the following steps of dissolving a binder by an organic solvent, spraying the solution into a small amount of magnetic powder, carrying out drying to obtain mother powder, mixing the mother powder and the magnetic powder, adding an organic dispersant into the mixed powder, carrying out stirring, crushing the mixture by a high-speed pulverizer, sieving the powder, and processing the powder to form the dry-pressed anisotropic ferrite magnetic powder. The manufacturing method can effectively improve distribution uniformity of the magnetic powder in the magnet, improve permanent magnetism material BH max, and especially improve residual flux density (Br) and BH max. The dry-pressed anisotropic ferrite magnetic powder obtained by the manufacturing method has good performance consistency and no black points, does not adhere to the wall easily and is conducive to batch production.