109 results about "Visual sensitivity" patented technology

In a color display device, when using white (W) sub-pixels in addition to subpixels of red (R) and green (G) plus blue (B) without increasing a wiring line number, the per-color pixel number in a unit area decreases so that the image resolution is deteriorated. The area and number of subpixels are adjusted in accordance with the visual sensitivity or luminosity required. Practically, the area of red (R) and blue (B) subpixels which are relatively low in luminosity is set to be about two times greater than the area of green (G) and white (W) subpixels that are relatively high in luminosity while letting the number of green (G) and white (W) subpixels be twice the number of red (R) and blue (B) subpixels. A larger subpixel is configured from a plurality of unit subpixels. A smaller subpixel is formed of a one unit subpixel.

A phosphor of which emission wavelength can be optionally set in a region with high human visual sensitivity to make it possible to enhance lumlinance in the region, and which has an excitation band for light in a wavelength region emitted from the aforesaid light emitting portion, a production method of the same, illumination and an LED using the aforesaid phosphor are provided. As raw materials, for example, Ca₃N₂, CaO, Al₂O₃, AlN, Si₃N₄, and SiO₂ an Eu₂O₃ are prepared, and each of the raw material is weighed so that a mole ratio of each element is, for example, (Ca, Eu): Al: Si=1:1:1, mixed and prepared under a nitrogen atmosphere, fired at 1500° C. under the nitrogen atmosphere to obtain a main production phase of a phosphor expressed by CaAlSiN₃:Eu, and by controlling a compounding amount of each raw material at the time of raw material preparation, the oxygen concentration in the constitution of the production phase and mol concentration of Eu doping are controlled to optionally set the emission wavelength of the production phase.

The present invention relates to methods for efficient adaptive measurement and classification of contrast sensitivity functions and spatiotemporal contrast sensitivity surface by selecting the most informative stimulus before each trial. Also disclosed are devices for implementing such methods.

The invention discloses a three-dimensional image objective quality evaluation method, which comprises the following steps: respectively carrying out wavelet transformation on left view point images and right view point images of undistorted three-dimensional images and distorted three-dimensional images; extracting characteristic values of each sub band; carrying out similarity measurement on the characteristic values; determining the weight factors of each sub band by contrast sensitive functions; then, realizing the evaluation on the three-dimensional sensing quality through evaluating the absolute difference image similarity of left images and right images of the undistorted three-dimensional images and the distorted three-dimensional images; and finally, combining the quality of the left images and the right images and the three-dimensional sensing quality to obtain the final evaluation results of the three-dimensional image quality. The invention has the advantages that the human eye visual characteristics such as human visual sensitivity bandpass, the multi-channel effect, the three-dimensional sensation and the like are utilized, the three-dimensional sensation is simultaneously evaluated on the basis of the evaluation on the quality of the left view point images and the right view point images, the influence of the three-dimensional sensation in the three-dimensional images on the final three-dimensional image quality is merged into an evaluation model, and the correlativity of the objective evaluation results and the subjective sensation is improved.

The invention administers an objective clinical test to an eye that measures the visual sensitivity of the superior retina and the inferior retina, by alternately presenting a stimulus pair comprising a shaped superior light stimulus and a shaped inferior light stimulus that are horizontal mirror images of one another and have shapes encompassing visual field defects. The shaped superior and inferior light stimuli stimulate pupillary responses whose amplitudes are measured. A cycle-averaged pupillary response balance and a luminance ratio are computed for each presentation of a stimulus pair. A stimulus pair response curve is computed by fitting cycle-averaged pupillary response balances to a sigmoid function of the luminance ratios. A balanced luminance ratio at which the cycle-averaged pupillary response balance is equal to about zero is computed from the sigmoid function. The balanced luminance ratio is indicative of the presence and location of retinal nerve damage.

Provided is a multicolor display apparatus including a plurality of organic light-emitting devices each including a pair of electrodes of an anode and a cathode; and an organic compound layer interposed between the pair of electrodes and including a light-emitting layer. The viewing angle characteristics of the organic light-emitting device showing an emission color with a highest visual sensitivity is such that a peak wavelength of emission spectrum and a peak wavelength of multiple interference spectrum due to the organic light-emitting device are offset with respect to each other so that the color shift of a display image on the multicolor display apparatus depending on a viewing angle is suppressed.

A display 10 according to one embodiment of the invention includes a display panel having an active matrix substrate and a color filter substrate, a lighting unit for the display panel, ambient light photosensors 32₁ to 32₆, a controller that controls luminous intensity of the lighting unit based on outputs from the ambient light photosensors 32₁ to 32₆, and a spectral sensitivity adjustor provided at a position on the color filter substrate corresponding to the ambient light photosensors 32₁ to 32₆ in order to make the spectral sensitivity of the ambient light photosensors 32₁ to 32₆ match human visual sensitivity. The spectral sensitivity adjustor may be a color filter or a polarizing filter. The display thus structured automatically and stably controls on/off of its backlights depending on the brightness of the surroundings with a sensitivity corresponding to human visual sensitivity.

The invention discloses a multi-view image color correction method based on visual perception, comprising the following steps of: firstly extracting significance distribution maps of a target image and a source image; then extracting visual attention areas of the target image and the source image by estimating a Gaussian mixture model; obtaining accurately matched pixel point pair sets of the source image and the target image by a parallax matching algorithm; obtaining correction matrixes of the visual attention areas by a linear regression algorithm; obtaining a final correction matrix by adopting linear weighting; and finally further refining a visually sensitive area of a correction image. The invention ensures the accuracy of multi-view image color correction and also enhances the robustness of the multi-view image color correction method and the visual comfort level of the correction image.

Embodiments of the present invention provide methods and apparatus for decoding digital video or motion picture signals with error concealment to prevent or minimize degradation of the picture quality. When corruption occurs, the method determines whether error concealment is needed according to a preset criterion. If so, motion vectors for the corrupt region are calculated using the motion vectors and rates of change of motion of current blocks in the current frame and/or old blocks in a previous frame according to a best matching block selection process. The method also determines if the “time” relative motion of content is small by defining a percentage use parameter. In some cases, once the error concealment is complete, the “weight” or visual sensitivity of the restored block is decreased in order to reduce boundary artifact effects. This is accomplished by a quantization mask employing the human visual system (HVS) concept.

The invention discloses a detection method for small objects in a visible light image. The detection method comprises the following steps: firstly, establishing a motion conformity model and carrying out feature extraction by simulating the sensitivity of human visual sense to the color, the direction and the motion features to establish a visual attention mechanism model; selecting an object detection mechanism and choosing the visual attention mechanism model by means of image visual features in different working modes, thereby carrying out object detection in different working modes; and completing object centroid positioning. Due to carrying out track detection by means of the visual features of an object, the detection method makes full use of visual sensitivity to the color, the gray scale, the direction and the motion and adopts different combinations centralizing the visual attention mechanism model to realize the detection of the small objects in multiple working modes.

The invention relates to a perceptual video coding method based on the saliency and just noticeable distortion and belongs to the field of video coding. The method is characterized by including calculating a saliency value and just noticeable distortion value of a video frame image to be processed; adjusting the just noticeable distortion value according to the saliency value of the video frame image, and acquiring a saliency just noticeable distortion threshold; filtering the residual in the video coding process according to the saliency just noticeable distortion threshold, and acquiring the perceptual video code on the basis of the saliency and just noticeable distortion. The method is reasonable in design, on the basis of an HEVC frame, two visual perceptual models, namely a visual attention model and a visual sensitivity model are combined to form an S-JND (saliency-just noticeable distortion) algorithm, visual redundancy of video data can be further excavated and removed, on the premise of not affecting the subjective quality, the video coding rate is reduced effectively, and the video coding efficiency is improved.

When forming a test chart for investigating output characteristic relating to yellow color agent, a printer outputs yellow color agent in a plurality of densities that correspond to various density levels and also outputs cyan color agent in a fixed and maximum density. Patches in gradations from cyan to green are formed by overlapping the yellow color agent and the cyan color agent. The patches are formed with respect to a surrounding area that is formed by outputting the cyan color agent in the fixed and maximum density. Accordingly, the colors of the patches are easier to distinguish than when the patches are formed from yellow only. Visual calibration can be easily performed even with the yellow color agent that has a low visual sensitivity.

The invention discloses an infrared and visible light image fusion method based on a multi-scale contrast ratio. On the basis of the multi-scale contrast ratio obtained by calculation, according to different decomposition detail ranges of each scale, the fusion weight of an infrared image and a visual light image in each layer of scale information is independently determined, a corresponding multi-scale information fusion strategy is designed, and therefore, an infrared and visible light fusion image has a better visual effect. A contrast sensitivity function which represents human visual characteristics is combined to extract the multi-scale contrast ratio which exhibits visual sensitivity, visual sensitivity information is highlighted, so that the fusion image has a better visual effect, and the perception of an observer for a scene and the quick identification ability of the observer for an important target can be enhanced. By use of the method, while the contrast sensitivity function which represents human visual characteristics is combined, the mask effect of a visual contrast ratio is considered, visual sensitivity characteristics are effectively utilized to guide a fusion process, and the visual effect of the fusion image is further enhanced.

A driving circuit that reduces chip size of a source driver while maintaining image quality when image data is configured by multiple bits. The source driver provided in connection with a timing controller that converts image data into color data. The source driver displays an image by controlling pixel density of a liquid crystal panel. The source driver is divided into plural regions in units of pseudo linear elements to perform a gamma correcting operation based on a gamma characteristic. In the source driver a GMA voltage for each region is divided by resistive elements arranged between input signal lines. With respect to variation of plural divided GMA voltages, variation of the maximum high density region becomes coarser than variation of the maximum low density region in compliance with visual sensitivity of the density, thus reducing the number of input data lines of the source driver.

In an image reading apparatus for reading a color document as a monochrome image, an image forming apparatus of the invention includes a composite light source that irradiates the color document and includes plural light sources different in spectral distribution, a sensor to detect the intensity of a reflected light from the color document, a light emission ratio setting unit to changeably set light emission ratios different for the respective light sources, and a light source control unit to control effective light amounts of the plural light sources with the set light emission ratios. According to the image forming apparatus of the invention, when the color document is monochromatically read, the reading is performed with the brightness close to the human visual sensitivity, the user can changeably set color sensitivity, and uneven density can be reduced.

The invention relates to a method and device for suppressing retransmission. The corresponding method comprises the following steps of: judging whether visual sensitivity of a TS (Transport Stream) in a first RTP (Real-time Transport Protocol) message is lower than a threshold value or not and discarding the TS with the visual sensitivity lower than the threshold value if a judgment result is definite; and replacing the first RTP message with a virtual RTP message if all the TSs in the first RTP message are discarded, wherein the virtual RTP message has the same serial number as the first RTPmessage. By filling the virtual RTP messages in the current RTP messages discarding all the TSs, and ensuring the serial numbers of the RTP messages to be consecutive, retransmission can be suppressed while video packages are discarded without introducing an extended private protocol or confirming reordered starting serial numbers, and expansibility and generalization are improved.