29 results about "Contrast ratio" patented technology

The invention discloses an adaptive histogram reinforced defogging method based on a dark channel. According to the method, a dark channel model is adopted to obtain a dark channel map of a foggy image, the dark channel map is divided into a plurality of square blocks, and a weighting factor of each square block is calculated; then, a sub-block histogram of each square block is subjected to statistics with an implementation method of CLAHE; according to the sub-block histogram, a sub-block limit contrast histogram is calculated; a histogram balanced grey mapping relationship table corresponding to the square block is calculated based on the contrast histogram, and contrast stretching grey mapping is calculated; a final grey mapping relationship table is calculated by using the weighting factor, the grey mapping relationship table and the contrast stretching grey mapping; by using the grey mapping tables of the four adjacent square blocks, a center pixel of each block adopts an original grey mapping relationship, while the other pixels are acquired via grey mapping interpolation of the four blocks, and a defogged image is obtained; and finally, the image is output. According to the adaptive histogram reinforced defogging method based on the dark channel, provided by the invention, the dark channel model and a traditional CLAHE image reinforcement algorithm are combined, so that depth information in a foggy day is effectively utilized and complicated transmission pattern estimation is avoided; a single image is processed; and the adaptive histogram reinforced defogging method is good in defogging effect and high in practicality.

The invention is based on a method for examining structures on a semiconductor substrate. The structures are imaged with X-radiation in an X-ray microscope. The wavelength of the X-radiation is established as a function of the thickness of the semiconductor substrate in such a way that both a suitable transmission of the X-radiation through the semiconductor substrate and a high-contrast image are obtained. As a result, the structures can be observed continuously with short exposure times, high resolution and even while they are in operation.

There is disclosed a camera capable of display a moving image, which executes auto focusing of a hill-climbing system while executing a blur correcting operation to reduce image blur generated by vibration applied to the camera. Examples of the blur correcting operation include a correcting operation by a mechanical blur correction mechanism which moves an image pickup device so as to cancel the vibration, and a correcting operation of electronic image blur correction to obtain a video signal which does not have any image blur from an output of the image pickup device by processing an image.

The invention provides a detection method for detecting an infrared weak and small target. The method comprises the steps of background suppression: suppressing the background of a target by utilizing brightness contrast significance-based radiation energy characteristics and the isotropic characteristics of a fan-shaped Gaussian differential filter; track extraction: extracting the movement track characteristics of the target by utilizing an inter-frame difference method and a constant false alarm rate threshold value segmentation method; and result output: according to the movement track continuity of the track, obtaining a final detection result. The invention further provides a detection system for detecting the infrared weak and small target. Based on the technical scheme of the invention, the directional characteristics, the energy characteristics and the movement characteristics of the ground observation image of a sky-based satellite are comprehensively analyzed. Therefore, the interference on various complex false alarm sources on the ground surface is effectively weakened. The false alarm rate of the detection is reduced, and the robustness of the algorithm is enhanced. Moreover, the calculation is simple and efficient, and the real-time performance is high. The method and the system can be conveniently realized on a hardware platform.

A contrast calculating unit calculates a contrast of a high frequency component and a contrast of a low frequency component of a transformed radiographic image at an analysis point set by an analysis point setting unit. A ratio calculating unit calculates a ratio of the contrast of the high frequency component to the contrast of the low frequency component. A determining unit determines whether or not there is a body motion during an imaging operation to take the radiographic image based on the ratio. A display control unit displays a result of the determination on a display unit.

The invention relates to a videodisc center positioning method according to fundus image edge information and brightness information. The method comprises the steps of preprocessing a fundus image; extracting a vertical edge image and a horizontal edge image of the fundus image after contrast reinforcement by means of an Isotropic Sobel operator, performing positioning for obtaining a horizontal coordinate of the videodisc according to an edge difference curve; extracting a blood vessel density characteristic and a videodisc brightness characteristic; defining a product of the blood vessel density characteristic and the videodisc brightness characteristic as a comprehensive characteristic value of the vertical coordinate, and obtaining a comprehensive characteristic value curve which is related with the vertical coordinate, wherein the coordinate which corresponds with the maximum value on the curve is the vertical coordinate of the videodisc. The videodisc center positioning method has an advantage of high positioning accuracy.

A band-limited image signal generating unit decomposes an input image signal into a plurality of band-limited image signals, each representing an image having different frequencies. An index value obtaining unit obtains an index value indicating a level of noise suppression based on data representing spatial frequencies as well as an evaluation value representing local contrast at a pixel of interest in band-limited images and data representing an X-ray dose. A noise suppression processing unit performs noise suppression processing on each pixel of each of band-limited images based on the index value. A processed image generating unit obtains a processed image, in which noise has been suppressed, by adding signals obtained by subtracting processed band-limited image signals, of which noise has been suppressed, from the band-limited image signals together, extracting a noise image signal, and subtracting the noise image signal from the input image signal.

Cognitive deficits involving attention, sequential processing, reading, speed of processing, and navigation may be diagnosed and remediated in a subject by respectively measuring and improving contrast sensitivity for motion discrimination of the subject. A background may be displayed with a contrast and temporal frequency and either single, or multiple, higher spatial frequencies that may repeat over a wider area than the individual frequency components. A test window may be superimposed over the background, and includes a test pattern with a contrast and a spatial frequency and a temporal frequency The subject may provide a signal indicative of the direction the subject believes the test pattern moved. In response to this signal, the contrast of the test pattern, the spatial frequency of the background, the spatial frequency of the test pattern, or the temporal frequency may be modified, either by increasing or decreasing its respective value.

A copy-resistant document is provided. The document comprises a substrate, a light reflective layer disposed over the substrate, a light diffusive layer disposed over the reflective layer, and bearer information overprinted on the reflective and diffusive layers. The diffusive layer has a diffusive background pattern that segments the reflective layer into a reflective background pattern comprising a plurality of reflective elements that interfere with the bearer information on a copy of the document. As a result, the diffusive background pattern allows the bearer information to become more readable on the document original by providing contrast to the bearer information and reducing the glare from light reflected from the reflective layer, while the reflective background pattern renders the bearer information unreadable on the document copy.

Intensity profile correction for data pages for holographic storage

The present invention relates to a method for recording data pages in a holographic recording medium, and more specifically to a method for compensating for sensitivity variations of the holographic material of the holographic recording medium. According to the invention, a method for recording data pages on a holographic recording medium has the steps of:

modulating a light beam with a spatial light modulator to generate a data page with data to be recorded, and

applying a compensation profile to the data pages during recording for reducing contrast variations in the reconstructed data pages, wherein the compensation profile is determined from the irradiation history at the recording position and the sensitivity curve of the material of the holographic recording medium.

The invention discloses a regional backlight control method, a display and a storage medium. The method comprises the following steps: acquiring a regional gray feature value which corresponds to eachbacklight region and is used for representing gray information when a backlight module runs; comparing the regional gray feature value of each backlight region with a preset feature threshold value so as to divide each backlight region into a highlight region or a dark region; increasing the backlight brightness of all the highlight regions, and reducing the backlight brightness of all the dark areas. According to the invention, after the gray feature information of the backlight areas after affiliation division is extracted, the backlight of each backlight area can be adjusted according to the specific display content of the display and the required image representation, the image gray representation and the dynamic contrast effect are improved, and a more real and natural image is presented.

The invention discloses a method for adjusting a code rate by utilizing contrast change, which comprises the following steps of: adjusting the contrast according to the size of an output code stream in a video preprocessing stage before video compression coding; when the contrast is compressed, the contrast is 0-1, and reducing the dynamic range of the image; and performing linkage brightness adjustment. According to the method, the code rate is reduced, the mosaic occurrence probability is reduced, and the video watching effect is improved.

The invention discloses a display panel, and a display method and a display device thereof. According to the display panel, a second polarizer is set as a plurality of first sub polarizers and a plurality of second sub polarizers, which are arranged at intervals, wherein each first sub polarizer has the same function as a normal polarizer, an optical axis direction of each first sub polarizer is vertical to a first polarizer; a two-dimensional plane where the optical axis of each second sub polarizer is located forms a preset included angle with the two-dimensional plane where the optical axis of the first polarizer is located, and thus the contrast of light penetrating through the second sub polarizers will be reduced under a large visual angle. Therefore, during normal display of the display panel, all pixel electrodes are started to meet the display of the large visual angle; and when the display panel performs anti-peeping display, only the pixel electrodes corresponding to the second sub polarizers are started, thereof the contrast of the light penetrating through the pixel electrodes is reduced under the large visual angle, the visual angle of a viewer is limited, and thus an anti-peeping display effect is realized. Compared with the prior art, the display panel disclosed by the invention has the advantages that the switch between normal display and anti-peeping display can be realized without using an additional switching device.

A method and apparatus are disclosed for identifying an object with specific characteristics and automatically obfuscating part or all of a digital image corresponding to that object. The obfuscation comprises pixelation, color alteration, and/or contrast alteration. The obfuscation optionally can be performed only when the digital image is being viewed by certain client devices.

In a method and apparatus for determining measurement protocol parameters of a magnetic resonance (MR) image, a first MR image exhibiting first contrast properties, is read into a computer and at least one first contrast ratio is determined in the computer from the first contrast properties. The computer then determines the measurement protocol parameters dependent on the at least one first contrast ratio, in order to generate a second MR image exhibiting second contrast properties such that the second contrast properties approximate, as closely as possible, to the first contrast properties. The measurement protocol parameters are presented as an output from the computer.

The invention provides a printing evaluation method, a terminal device and a computer readable storage medium, and relates to the technical field of POS machine printing. The method comprises the following steps: extracting pixel data of an image pattern to be judged; processing the pixel data to obtain contrast value, uniformity value and shading value of the image pattern to be judged; and synthesizing the contrast value, uniformity value and shading value of the image pattern to be judged, and judging the printing effect. By obtaining three dimensions, that is, the contrast value, the uniformity value and the shading value, of the image pattern to be judged, the method, on one hand, provides a way of judging the printing effect of the POS machine objectively and comprehensively to avoid not-objective conclusion drawn due to subjective judgment of the printing effect, and on the other hand, reflects printing problems of the POS machine from different dimensions so as to take appropriate solutions.

The invention discloses a combination which expresses a 2.5P 5.25/5 pigment and a technical method for preparing a color characterization matter by the combination. The compositions in portion by weight of the combination are: 995 to 1005 portions of CSC-B base material, 12.6 to 13.6 portions of PV23 pigment (with the content equal to 30 percent) and 2.2 to 2.3 portions of PBK7 pigment (with the content equal to 9 percent), wherein the essential component of the CSC-B base material is an acrylic acid polymer with the content of between 30 and 40 percent and the average molecular weight ranging from 150,000 to 200,000; TiO2 is selected as main white pigment with the content of between 8 and 12 percent; moreover, the contrast ratio of the base material is between 0.78 and 0.82, while the Stormer viscosity is between 90 and 100KU; and when an incident angle is equal to 85, the glossiness of the base material is between 5 and 10. The color characterization matter has ideal weathering resistance and stability and excellent proportioning reproducibility, and the raw materials and the technological process adopted by the color characterization matter accord with the requirements and the standards of environmental protection for low VOC and zero VOC; moreover, the color characterization matter has less color difference as compared with a standard value in the national standard theoretical model of the Chinese Color System as well as higher accuracy in color realization, and can be widely used in a plurality of color-related fields.

This invention discloses a kind of 7.5P 7.5/4 pigmentary combination and its method for preparation of color blocks. The compositions of the said combination are as follows by weight: CSC-B, the base in 995-1005 portions; PR122 with 30% color content, in 1.97-2.01 portions; PV23 with 30% color content, in 0.09 portions, PBK7 with 9% color content, in 0.28-0.30 portion. The main constituent of the said CSC-B base is acrylic acid copolymer, whose content is 30-40% and the marked ISO 591 R2 pigment, whose content is 8-12%, is the main used white pigment with the content of titanium dioxide greater than or equal 95%, the oil absorption less than or equal 20g/100g and the Reynolds coefficient of the reducing power equal to 1800. The contrast ratio of the main material to the base is 0.78-0.82, the Stomer viscosity is 90-100 KU and the gloss is 5-10 degree at an incidence angle of 85 degree . The said combination in this invention has characteristics of high weather resisting property and stability and good repeatability of the mixture ratio. All used crude materials and technical processes meet the requirements and standards of low voice and zero voice. The chromatic aberration of the said color blocks is small compared to the standard values of the theoretic models in the book 'Chinese Color System'. With the high accuracy of the implemented color, the good proficiency of the making technique, the said product has strong use value.

The invention discloses a zero mark formation method applicable to EPI (epitaxy) process. The method includes the steps of spin-coating photoresist, exposing a zero layer, etching to form a zero mark with a silicone substrate step, and depositing a lining oxide layer. By the zero mark formation method applicable to EPI process, step difference of the zero mark can be enhanced, and optical contrast can be increased.

The embodiment of the invention relates to a sensing imaging control method and device. The sensing imaging control method comprises the following steps: determining a first exposure parameter; exposing according to the first exposure parameter, and acquiring initial image information; processing the initial image information, determining an image background parameter of an initial image, and determining an image background saturation parameter of the initial image according to the image background parameter; determining an average background saturation parameter according to the image background saturation parameter; determining an image optimal image contrast ratio according to the average background saturation parameter; determining a second exposure parameter according to the image optimal image contrast ratio and the first exposure parameter; and exposing according to the second exposure parameter, and acquiring optimized image information. The sensing imaging control method and the device provided by the embodiment of the invention do not depend on fixed illumination conditions, the processing process is automatic, and the image quality can be adjusted by controlling the exposure parameters under different luminous environments.

The invention discloses an artificial intelligence image diagnosis system. The system comprises a touch remote controller, an image collection X-ray machine and a machine head sensing detection assembly; the machine head sensing detection assembly is glued and fixed on the front surface of the image collection X-ray machine; and the machine head sensing detection assembly is mainly composed of a main control unit, a power supply module, a distance measuring sensor, a light intensity sensor, a gyroscope, an acceleration sensor and a Bluetooth communication module. In the actual operation process, interference factors caused by image collection can be rapidly removed by the aid of auxiliary assemblies, and rapid angle adjustment and rapid adjustment of the light intensity and the cleanlinessof a light detection end are realized on the whole, so that the uncertainty in the recognition process is reduced, and the recognition accuracy is improved; meanwhile, a local threshold value is subjected to self-adaptive calculation by using contrast information of an edge region, so that relatively low-contrast foreground information can be reserved while noises are suppressed; and a low-quality image can be effectively processed.