31 results about "Visual threshold" patented technology

The invention discloses a stereoscopic video quality evaluation method based on a binocular minimum discernible distortion model, which includes: firstly building a binocular stereoscopic brightness relation model, and researching respective pixel brightness of a left viewpoint video and a right viewpoint video and the brightness relation of the pixel brightness of the left viewpoint video and the right viewpoint video when they integrate to form a stereoscopic video ; building a stereoscopic image just noticeable difference (JND) model according to background brightness and texture masking, and building a stereoscopic video JND model according to a visual threshold value masked by video interframe; obtaining a visual threshold value of a function based on space-time contrast sensitivity through the function based on space-time contrast sensitivity and relative parameters of a display device; obtaining a binocular JND model by combining the stereoscopic video JND model and the visual threshold value of the function based on space-time contrast sensitivity; and finally building a binocular perception peak signal-to-noise ratio based on stereoscopic video quality for evaluating stereoscopic video quality. The method is based on the binocular JND model, leads evaluation of stereoscopic video quality to be identical with video quality subjectively perceived by human eyes, and correctly reflects human eye visual stereoscopic video perception quality.

The invention discloses an objective image quality evaluation method based on manifold feature similarity. The method comprises the following steps: at first, using a visual salience strategy and a visual threshold strategy to remove an image block which is not important to visual perception, namely a rough selection process and a fine selection process of the image block, extracting a manifold feature vector of the selected image block from an original undistorted natural scene image and a distorted image to be evaluated by using an optimal mapping matrix after selecting the image block, and then evaluating the structural distortion of the distorted image through the manifold feature similarity; thereafter, considering the influence of the image brightness change on human eyes, and calculating the brightness distortion of the distorted image based on a mean value of the image block; and finally, obtaining a quality score according to the structural distortion and the brightness distortion. Therefore, the method has higher evaluation accuracy, the evaluation ability of all kinds of distortion is expanded, the evaluation performance is not influenced by the image contents or the distortion type, and the consistency with the subjective perception quality of the human eyes is relatively high.

The invention relates to a device and a method for measuring visual threshold values, and belongs to the technical field of optical precision measurement. The device for measuring the visual threshold value comprises a first uniform surface light source, a second uniform surface light source, a first fundamental color matching system, a second fundamental color matching system, a first complementary color matching system, a second complementary color matching system, a first color mixing system, a second color mixing system and a beam splitting system. A set of multi-parameter measurement device for the visual threshold values is implemented by utilizing a four-integrating sphere light source system and multiplexing the color matching systems, the color mixing systems and a subsequent light path to generate four observation targets of which the brightness (illuminance), the contrast, the chromaticity and the periodic pattern frequency are variable, and can be used for simultaneously measuring visual illuminance, contrast and chromatic aberration threshold values, so that the device is convenient to operate, wide in measurement range and color gamut adjustment range and higher in light source output power, and a plurality of parameters can be measured.

The invention discloses a cross validation depth map quality evaluation method combined with a JND model. According to the method, a color map corresponding to a depth map and a color map on an auxiliary viewpoint are utilized to obtain a difference image; the number of pixels at each coordinate in the color map on the auxiliary viewpoint to which the depth map and the color map corresponding to the depth map are mapped is utilized to obtain a shielding mask; then the shielding mask is utilized to remove pixel points shielded in the difference image to obtain a difference image after deshielding; then the color map on the auxiliary viewpoint is divided into a flat region, an edge region and a texture region to obtain a region marking map; a JND model is introduced, combined with the region marking map, an error visual threshold of each pixel point in the color map on the auxiliary viewpoint is obtained; and finally, according to the deshielded difference image and the error visual threshold, a depth error map is obtained, and the rate of error pixel points in the depth map is further obtained as a quality evaluation value. The advantage is that the method can effectively improve consistency of an evaluation result and the quality of virtual viewpoints obtained by drawing.

The invention discloses an image recoverable information hiding method based on Sudoku matrix index. First, under the visual threshold control index, determine the size of the ICP insertion coding space corresponding to ECover for Cover, conduct statistics on the segmentation features of the information M to be hidden, and select the Sudoku sequence and index optimization strategy that can continuously index with the maximum probability depth. Then index based on the index optimization strategy and the optimal Sudoku sequence, in the allowed insertion coding space of the ICP group of ECover, the depth continuous index coding is performed alternately by row and column. Finally, under the condition of ensuring the visual threshold, the bPP index of information hiding is improved. Finally, according to the reversible rules of the encoding rules, the hidden information is extracted and the Cover is recovered. The method supports the feature of information encryption and can protect hidden information from being deciphered.

The invention discloses a video space-time search method. The video space-time search method comprises the steps of searching a video set satisfying a time constraint according to a time search condition; sampling a searching object into a plurality of sampling spatial points, and sampling the shooting direction into a plurality of direction units; determining whether the sampling spatial points are in visual threshold of video frames, obstructed by barriers and clearly imaged or not, and calculating perception intensity of the current spatial point by the current video frame if conditions are satisfied; calculating the direction of the video frame shooting the sampling spatial point, and merging each video frame to a corresponding angle unit; and calculating the sum of the perception intensity of the video frames belonging to the same video in each sampling spatial point and each angle unit, and selecting the video having the maximum perception intensity as the object video, a set formed by object videos involved in all sampling spatial points and direction units being a space-time search result. An ordered list of comprehensively describing spatial object information is obtained on this basis.

The invention discloses an objective evaluation method of image quality based on the similarity of manifold features, which first adopts two strategies of visual salience and visual threshold to remove image blocks that are not important to visual perception, that is, image block rough selection and fine selection process After completing the block selection, use the best mapping matrix to extract the manifold feature vector of the image block selected from the original undistorted natural scene image and the distorted image to be evaluated, and then measure the distorted image by the similarity of the manifold feature Structural distortion; after considering the impact of image brightness changes on the human eye, the brightness distortion of the distorted image is calculated based on the average value of the image block; finally, the quality score is obtained according to the structural distortion and brightness distortion, which makes this method have higher evaluation accuracy , also expands its ability to evaluate various types of distortion, and the evaluation performance is not affected by the image content and distortion type, and has a high consistency with the subjective perception quality of the human eye.

The invention discloses a road lighting field test operation mechanism which sequentially comprises a foundation base portion, a horizontal operation device, a control cabinet, a vertical operation device, a telescopic arm operation device, an elevation operation device and a lightning arrester from bottom to top. The road lighting field test operation mechanism has the advantage that the various visual tests (visual threshold, reaction time, visibility level, legibility and the like) of road lighting are difficult to perform on actual roads and can be performed on test roads with abundant time. A field test evaluation system enables customers or users to sense actual lighting effect visually. The road lighting field test operation mechanism can evaluate the quality of a lighting system more reasonably, simultaneously can provide demonstration functions for the users, can simulate various road lamp lighting modes, can adjust parameters of lamp rod height, lamp rod installation space, lamp irradiation angle and the like, and contains various road lamp lighting modes basically and completely.

The invention relates to a device capable of producing a contrast observation object and a chromatic aberration observation object and belongs to the technical field of optical precision measurement. The device comprises a first uniform surface light source, a second uniform surface light source, a first base color matching system, a second base color matching system, a first large integrating sphere, a second large integrating sphere, a target board, a cube beam splitter prism, a first reticle and a second reticle, wherein lights emitted by one uniform surface light source irradiate the base color matching systems, the lights with different colors and different brightness are produced by means of the base color matching systems, the lights emitted by the base color matching systems irradiate the large integrating spheres for color mixture to form the uniform surface light sources with specific colors and specific brightness, by means of the other same light path, the other uniform surface light source with specific colors and specific brightness are formed, and two path surface light sources pass by a follow-up light path to produce the contrast observation object and the chromatic aberration observation object. According to the device capable of producing the contrast observation object and the chromatic aberration observation object, the measurement range is wide, the structure is simple, and the device an be used for producing continuously-variable contrast observation objects and chromatic aberration observation objects for the measurement of visual threshold values.

The invention belongs to the technical field of software design, and discloses an information processing method based on a three-dimensional parameterized model of a building space for a sense of openness in a building, setting a view field and importing the view field into the parametric model that includes information on the interface of surrounding materials. Information data; evaluate the validity of the parametric model based on the positional relationship between the viewpoint and the material interface in the visual threshold, whether the geometric shape of the material interface is complete, and whether the material setting of the material interface is complete; if it is invalid, ask the user to reset the parameterization Model; select the parametric model object in the measurement space, and set the object material; check whether the material setting of the measurement object is complete; output the evaluation results of the openness of the architectural space. The invention enables the designer to numerically calculate and compare the openness of different design schemes in a certain space by using the existing architectural computer model; without the participation of a large number of users, the tediousness and complexity of the evaluation process is reduced, and the Data breach problem.

The present application discloses a linked shooting control method, device, and computer-readable storage medium, wherein the method includes: identifying and analyzing the shooting state, determining the visual state and operating state in the shooting state; and then, if If the visual state is worse than the preset visual threshold, analyze the operating state, wherein the operating state includes the operating gesture of the wearable device corresponding to the operating object; finally, acquire the first A shooting parameter control signal, and analyzing the operation gesture to obtain a second shooting parameter control signal, and adjusting the shooting parameters of the scene to be shot in combination with the first shooting parameter control signal and the second shooting parameter control signal. A humanized linkage shooting control scheme is realized, which makes it easier for users to adjust the shooting parameters correspondingly during the shooting process of the terminal device, which improves the operation efficiency and enhances the user experience.