48 results about "Contrast used" patented technology

A text enhancement unit is introduced in order to alleviate the degradation of text characters on computer or television displays. The text enhancement unit uses an enhancement process to regain uniformity and intensity that may be lost during image processing. The text enhancer unit may be placed between an image processing unit such as a scaler, de-interlacer, or DSP, and a computer or television display to improve the quality of text characters that may have become degraded by image processing performed by the image processing unit. In one embodiment, the text enhancer unit improves contrast by multiplying pixel intensity by an intensity multiplier. In a second embodiment, the text enhancer unit improves contrast using a threshold operation which outputs either a very high or very low intensity pixel. In an third embodiment, the text enhancer unit improves contrast using a threshold operation which outputs either a very low intensity pixel or a pixel multiplied by an intensity multiplier. In a fourth embodiment, the text enhancer unit improves contrast using a threshold operation which outputs either an unchanged pixel or a pixel multiplied by an intensity multiplier. In a fifth embodiment, the text enhancer unit improves contrast using a dual threshold operation which outputs either a very low intensity pixel, a very high intensity pixel, or an unchanged pixel.

The invention relates to the use of mass labeled probes to characterise nucleic acids by mass spectrometry. Thus the invention provides methods of detecting the presence of a target nucleic acid in a sample, using a circularising probe in which a mass tag is present in the probe. Further methods of detecting the presence of a target nucleic acid are provided, which in contrast use a probe detection sequence in the circularising probe, wherein the probe detection sequence is detected with a probe attached to a mass tag. Methods for determining a genetic profile from the genome of an organism also form part of the invention.

A method of driving a liquid crystal display includes arranging an externally provided first data into a histogram for each frame, producing a second data having an expanded contrast using the histogram, determining a control value by extracting a peak value at a position where brightness components are concentrated in a distribution, and controlling a brightness of a back light in accordance with a gray level of the control value.

An imaging system includes an identification module, an analysis module, and a determination module. The identification module is configured to identify a scanning mode of operation. The analysis module is configured to determine an attenuation for an object for a scan to be performed on the object. The determination module is configured to determine an image contrast for each of plural setting combinations, determine a corresponding tolerable noise for the image contrast for each of the setting combinations based on the scanning mode of operation, and determine a corresponding diagnostic dosage for each setting combination, the diagnostic dosages corresponding to the image contrast and tolerable noise for the corresponding setting combination. The determination module is also configured to select an operational setting for the scan to be performed using the dosages determined.

This disclosure relates to the field of Optical Coherence Tomography (OCT). This disclosure particularly relates to an OCT system with improved motion contrast. This disclosure particularly relates to motion contrast methods for such OCT systems. The OCT system of this disclosure may have a configuration that scans a physical object, which has a surface and a depth, with a beam of light that has a beam width and a direction; acquires OCT signals from the scan; forms at least one A-scan using the acquired OCT signals; forms at least one B-scan cluster set using the acquired OCT signals that includes at least two B-scan clusters that each include at least two B-scans. The B-scans within each B-scan cluster set are parallel to one another and parallel to the direction of the beam of light. The OCT system may have a configuration that calculates OCT motion contrast using the at least one B-scan cluster set. This OCT system may form and display an image of the physical object.

A ring shape lighting device (1), used for lighting the mark around a CCD camera (3), has a lighting device (1), a lighting brightness control device (10), a lighting height control device (11), a lighting color control device (12) and a controller (5). The controller controls these devices and detects the marks using the CCD camera (3), by changing the lighting brightness at 1 percent step from 1 to 100 percent with different combinations of lighting height and lighting color. The device detects the mark contrasts using a contrast detection / determination device (23) and detects the variance using a variance detection / determination device (24). The device then determines the best lighting condition based on the variance.

The invention provides an underwater image restoration method based on wavelength compensation. The method comprises the following steps: performing nine-digit-based subdivision hierarchical search onan original image to estimate atmospheric light spots; and then calculating a transmission image by using a Haze-lines method in different Jerlov water types, compensating atmospheric light by usingdifferent attenuation coefficients, and calculating a distance image and a depth image to obtain a restored image. In order to further improve the contrast of the underwater image, a contrast-limitedadaptive histogram is used to enhance the restoration result. A final output image is determined according to a selection rule based on gray world hypothesis and information entropy. According to theinvention, the atmospheric light is obtained by using a nine-digit method, so that the influence of scenery and light spots on estimation of the atmospheric light is effectively avoided, and the atmospheric light is accurately estimated. The distance map and the depth map are estimated by using different water types, the underwater image degradation problem is effectively solved, and finally, thecontrast and the brightness of the image can be effectively enhanced by using the contrast-limited adaptive histogram for enhancement.

In a SPACE (Sampling Perfection with Application optimized Contrasts using different flip angle Evolutions) or equivalent magnetic resonance imaging pulse sequence, the dephasing gradient is generated (activated) so as to occur immediately in front of the second refocusing pulse, thereby eliminating the long time duration that occurs in conventional SPACE or equivalent sequences between excitation and readout. This long time duration has been identified as a source for flow-related artifacts that occur in images reconstructed from data acquired according to conventional SPACE or equivalent sequences. By eliminating this long time duration, such flow-related artifacts are substantially reduced, if not eliminated.

The invention relates to a magnetic resonance image contrast agent which uses arabinogalactan as carrier, wherein its production comprises that: using ethylenediamine tetra acetic acid, diethylene triamine pentacetic acid N-butanimide active ester, ethylenediamine tetra acetic acid, or the anhydrides of diethylene triamine pentacetic, via one short connecting arm to react with amination arabinogalactan; forming amido bond to connect ethylenediamine tetra acetic acid or diethylene triamine pentacetic acid to the arabinogalactan, to match magnetic metal ion as manganese, iron or lanthanide rare-earth element, to obtain complex. The invention has significant liver selectivity and low cute toxin. And the inventive contrast agent can be used in magnetic resonance diagnosis, X-ray CT or Y-flashimaging diagnosis.

A method applies fast and accurate autofocusing (AF) by using a contrast AF method in a digital photographing apparatus. In the digital photographing apparatus, when AF peaks of a subject of a central multi-point and a subject of a nearest multi-point are detected, further scanning is not performed. In addition, scanning is not performed on a region from which it is difficult to detect a peak, so that fast and accurate AF may be performed.

An image forming apparatus which is able to shoot high-quality images while improving image stabilization performance. An optical device which corrects for image blurring is moved in a direction different from an optical axis. Focusing is controlled by calculating a shape of a contrast using AF evaluation values at respective positions of a focus lens, which moves in the direction of the optical axis, at predetermined intervals and using a position of the focus lens at which the contrast is at its peak as a position at which a bundle of rays comes to a focus on a light-incident plane of the image pickup device. During the focusing control, positions of the focus lens obtained when the AF evaluation values were obtained or the obtained AF evaluation values are corrected according to detected positions of the optical device in a direction perpendicular to the optical axis.