147results about How to "Increase grayscale" patented technology

An image pickup apparatus capable of performing dynamic assignment of an output image in a dynamic range according to a subject.

The image pickup apparatus includes an image pickup device (131) for picking up an image of a subject, a signal processing section (133) for generating a composite image having a relatively wider dynamic range than at least either of the dynamic ranges of a long-time exposure image picked up with a relatively long exposure time by the image pickup device and a short-time exposure image picked up with a relatively short exposure time by the image pickup device, by synthesizing the long-time exposure image and the short-time exposure image, and a control section (137) for compressing the composite image and dynamically varies the assignment proportion of a high luminance dynamic range to a low-middle luminance dynamic range in a dynamic range of an output image to be outputted as a video signal.

The present invention provides a technique for performing gamma correction processing when there are a plurality of characteristic areas, each of which is characterized by the high frequency in a luminance histogram to improve the impression of contrast. According to the present invention, a luminance characteristic detector (4) detects the luminance of an input image signal and a microcomputer (5) calculates an APL and a luminance histogram of an input image signal. A gamma correction circuit (6) performs the gamma correction processing in response to the luminosity of the input image signal by use of the result of the calculation carried out by the microcomputer (5). Then, if there are a plurality of characteristic areas, each of which is characterized by the high frequency in the luminance histogram, a characteristic emphasis circuit (7) performs grayscale extension processing for the plurality of characteristic areas. This makes it possible to perform the most suitable processing in response to the input image signal so that the impression of contrast is improved.

Provided is a visible light communication apparatus. The visible light communication apparatus includes: a display unit that displays an image according to an image signal; a light source unit that operates as a backlight for the display unit, generates an optical signal by driving a light source based on a data signal, and outputs the generated optical signal to the display unit; a sensor unit that detects a region corresponding to a shape of a terminal which touches or approaches the display unit; and an image signal conversion unit that converts the image signal such that an image displayed in the region detected by the sensor unit is converted to a bright image having a gray level higher than a predetermined reference gray level.

An ink jet printing apparatus is provided which can form sharp images while maintaining high grayscale levels even if the images include various kinds of image constitutional elements to be printed by image data having different attributes, such as character, fine line and image data. This invention checks attributes of the input image data corresponding to the image constitutional elements making up the images and also detects edge and non-edge portions of the image constitutional elements. Further, this invention generates print data for printing the edge portions and print data for printing the non-edge portions based on attributes of the input image data corresponding to the image constitutional elements.

The invention discloses a method for driving displaying of a display unit through analog and digital hybrid drive. The method comprises the following steps that analog drive quantity controls the illumination brightness of the display unit; under the illumination brightness, digital drive quantity controls the illumination time of the display unit. The combination of the illumination brightness and the illumination time controls the illumination of the display unit, the rich gray scale and color are realized, the gray scale and color gradation expression ability of an image is obviously improved, the display of high contrast and high dynamic range is realized, and meanwhile, the system power dissipation and design requirements of a drive chip are reduced. The invention further discloses asystem for driving displaying of the display unit through analog and digital hybrid drive, and a drive circuit adopting analog and digital hybrid drive.

A method of enhancing the gray scale resolution of a PWM system. The method includes defining an N-bit PWM sequence with a length of 2^N−1 units. The N-bit PWM sequence includes a least significant bit (LSB) segment characterized by a temporal length of one unit. In some embodiments, the temporal length of one unit is referred to as a time t₀. The method also includes defining a fractional PWM sequence. The fractional PWM sequence includes the N-bit PWM sequence and a fractional bit segment of temporal length F. The temporal length of the fractional PWM sequence is 2^N−1+F units. In a particular embodiment, F=1 and the temporal length of the fractional PWM sequence is 2^N.

A combination of a bright and dark display pattern and a polarity pattern is used to drive a liquid crystal display device. In the bright and dark display pattern, bright display picture elements and dark display picture elements alternate with each other every one picture element in horizontal and vertical directions. In the polarity pattern, positive-polarity picture elements and negative-polarity picture elements alternate with each other every two picture elements in the horizontal and vertical directions. This driving method allows preventing a phenomenon in which a screen becomes whitish when viewed from any oblique angle (i.e., washing out), that is, what the effect of HT technique based on time division is aiming at, while preventing the occurrence of flicker and burn-in on the screen. Moreover, the driving method enables coarseness-free excellent display, because the bright display picture elements and the dark display picture elements alternate with each other every one picture element.

The grey treating method for color plasma display screen includes dividing grey level into lower, middle and high grey levels; detecting image information with FPGA in statistic digital image algorithm and grey detecting module, judging the grey characteristic of the current image information with the image processing device, real-time regulating image through expanding one weighting 0.5 sub-field to form 9-bit binary number and to raise the grey output levels in lower grey range of 0-50 to 10, and correcting error generated during processing with the error corrector. The present invention adopts dynamic grey correcting method, can regulate the grey display correction curve automatically based on the real-time image grey and brightness so as to raise grey level, and has lest list checking error and raised image quality.

An image processing method includes the steps of detecting a dynamic range of input image data, performing resolution conversion processing to increase the number of grayscale levels of the input image data, and performing dithering processing to reduce the number of grayscale levels of each pixel of the input image data. The number of pseudo grayscale levels in the dithering processing is determined, based on a parameter indicating the level of the dynamic range and a parameter concerning the resolution conversion processing.

A display device includes a display that includes display elements arranged in lines of a matrix. Each display element is configured to emit light based on a video signal that is received by the display. A proportion determiner is configured to determine, for each line, a proportion of a single frame period during which each display element of a corresponding line is not to emit the light. A signal converter is configured to convert an amplitude of the video signal for each line according to the proportion determined for each line. A signal output is configured to output the video signal converted by the signal converter to the display as a converted video signal. A scanner is configured to output a scanning signal to the display for each line for inputting the converted video signal to the display elements of each line based on the proportion determined for each line.

The invention belongs to the image fusing field, and specifically relates to an infrared polarization and light intensity image fusing method guided by a multi-feature objective function capable of comprehensively considering difference feature types and strong-weak relationship of a source image at several aspects and increasing the feature utilizing rate to improve the fusion effect. According to the invention, by utilizing the type and the amplitude of infrared polarization and light intensity image difference feature and an objective function established by a fusion weight vector, the strong-weak relationship between pixel multiple attributes is comprehensively considered; by utilizing features between source images as difference information between individuality of a group and by utilizing differential evolution to perform optimization fusion based on group differences, the fusion pertinence and the fusion effect of each feature are improved; the method has the several features of effectively improving the grey level, the texture, the edge and the contrast ratio in a fused imaged. The method is mainly used to fuse infrared polarization and light intensity images.

A display apparatus includes a display panel comprising a plurality of light emitting elements, a panel driver configured to drive the display panel by applying a current to the plurality of light emitting elements, a memory configured to store luminance information according to a current of the light emitting elements, and a processor configured to determine a target luminance of the light emitting elements based on a gray level of an image, and to control the panel driver to drive the display panel by adjusting a current applied to the light emitting elements based on the target luminance and information stored in the memory and adjusting a duty to which the adjusted current is applied.

The invention provides an LED display screen control system. The LED display screen control system comprises a scanning card (40) and LED lamp panel modules (50 and 60) connected with the scanning card (40), wherein the scanning card (40) comprises a data input/output circuit (43) and an image display control chip (20) arranged on a first circuit board; the image display control chip (20) is connected with the data input/output circuit (43), and is used for receiving a command packet and an image data packet through the data input/output circuit (43), and carrying out capture, correction, rearrangement and gray level extraction on the image data obtained by unpacking the image data packet according to parameter data obtained by unpacking the command packet, so that drive signal groups and display data groups are generated and converted into serial differential signal groups to be output to the LED lamp panel modules (50 and 60) for image display by the LED lamp panel modules (50 and 60). According to the LED display screen control system, the function of the scanning card is made chip-based to the greatest extent, and therefore, the purposes of reducing the size of the scanning card and improving the display effect of an LED display screen body are achieved.

The invention relates to a yellow pigment for a color liquid crystal filter, which consists of at least two compounds. The compounds include a compound I and a compound II. A preparation method for the pigment comprises the following procedures of: A, synthesizing a yellow pigment crude product of which the structural formula is the compound I by 2-methyl-8-aminoquinoline and tetrachlorophthalic anhydride serving as basic raw materials; and B, performing pigment processing on the yellow pigment crude product. The pigment processing procedure comprises the following steps of: 1, pre-grinding the yellow pigment crude product; and 2, performing pigment postprocessing on the pre-ground yellow pigment crude product. The yellow pigment prepared by the method has high transparency, brightness and contrast, and has good fluidity in a liquid dispersoid for coloring the color filter.

A digital encoding and decoding method of high bit-depth gray scale medical images allows standard 3-channel color image compression algorithms to be used to compress and de-compress such encoded high bit-depth gray scale images without significant image quality loss. The digital encoding and decoding method may be used to improve the network transmission, storage and rendering of such gray scale images in a standard web browser.

The low and high occupancy rate matrix sets are stored in the inkjet printer which performs printing with dots having different sizes. For the original image where banding unevenness easily appears, used is the low occupancy rate matrix set where the occupancy rate of all dots is lower than 100% in the maximum value of gray level and the proportion of the large dots is high in a high range of gray level. For the original image where reproducibility of details is required, used is the high occupancy rate matrix set where the occupancy rate of all dots becomes 100% in a value of gray level lower than the maximum value of gray level and the proportion of the small dots is high in a middle range of gray level. It is therefore possible to perform appropriate printing in accordance with the classification of the original image.

The embodiment discloses a method, a device and a mobile terminal switching background gray scales to save electricity; the method comprises the following steps: detecting the residual electricity quantity value of the terminal if the backlight control function is open; reducing the screen background image gray scale when the detected residual electricity quantity value is lower than or equal to the electricity quantity threshold value, thus updating a screen display frame; adjusting the gray scale and the screen backlight brightness of the updated screen display frame according to the backlight control function. The method and device can improve the screen backlight brightness dropping adjusting space, thus reducing terminal power consumption.

The invention provides an LED display screen control system (30). The LED display screen control system comprises a front-end controller (31), an LED lamp panel module (35), and a scanning card (33) connected between the front-end controller (31) and the LED lamp panel module (35), wherein the scanning card (33) comprises a first chip (333), and the LED lamp panel module (35) comprises a second chip (351); the first chip (333) is used for receiving and unpacking a data packet coming from the front-end controller (31), processing the image data obtained by unpacking the data packet, and repacking the processed image data, so that the processed image data packet is obtained, output and transmitted to the second chip (351) of the LED lamp panel module (35) in the differential signal manner; the second chip (351) is used for receiving and unpacking the processed image data packet coming from the first chip (333), and generating a control signal and a display data set according to the image data obtained by unpacking the processed image data packet, wherein the control signal and the display data set are transmitted to an LED drive circuit (355) on the LED lamp panel module (35) for carrying out display drive. Therefore, with the LED display screen control system, the problem that the signal transmission stability between the LED lamp panel module and the scanning card is poor is solved.