41results about How to "Eliminate brightness differences" patented technology

A mosaicking method for large breadth cultural heritage image is provided, which relates to the technical field of image matching and image mosaicking. The invention comprises the following processing procedures: 1) aiming at the features of cultural heritage image, adopt an angle point detection method to extract the angle point of image, which can be taken as image feature for the matching of images; 2) calculate gradient of straight line connected between the matching points of nearby images, and; adopt a clustering method to pre-select the correlation points between images by utilizing the similarity of gradient; 3) adopt a best route method to generate a smaller mosaicking route with little pixel value, so as to evade the area with big pixel difference and remove the ghost image; 4) use a brightness component in HIS color space and blend the brightness via weighted function formula according to the mosaicking route. Compared with other mosaicking method, the method provided in the invention is able to greatly improve the speed for image mosaicking, eliminate the brightness difference of image, remove the ghost image in mosaicking and realize ideal mosaicking result.

Provided is an image splicing method and device. The method comprises the steps that position matching is performed on a first image and a second image based on a pyramid-structured normalized orthogonal correlation coefficient and sub-pixel estimation, and the first image and the second image are two adjacent images to be spliced; and an image splicing edge is confirmed according to the result of position matching, and splicing of the first image and the second image is completed along the image splicing edge. Rapid and high-efficiency image splicing can be realized by the technical scheme, and higher splicing precision can also be guaranteed.

Adjustment of image pickup conditions through alternative selection of two cameras different in resolution, adjustment of image lightness of a to-be-recognized component based on component information of the component, and performing control allows an image of the component to be picked up by either one of the cameras under the image pickup conditions.

The invention discloses a point-by-point correction method for an LED display screen, and belongs to the field of LED display screen correction, and the method comprises the steps: S100, obtaining thebrightness value of each LED single lamp on an LED display screen; S200, calculating to obtain a standard brightness value of each LED single lamp based on a gradient descent method according to thebrightness values of all the LED single lamps; S300, calculating a correction coefficient of each LED single lamp according to the brightness value of each LED single lamp and the standard brightnessvalue; and S400, correcting the LED display screen according to the correction coefficient of each LED single lamp. According to the invention, the brightness difference between the LED single lamps can be well eliminated, the uniformity of the LED display screen is remarkably improved, and the display quality is improved.

The invention discloses a brightness equalization method and apparatus for a vehicle-mounted surround view system. The method includes the steps of determining, according to magnitudes of brightness changes of historical images taken by a plurality of cameras, a current image taken by one camera as a first reference image; determining a current image captured by a camera located on the opposite side of the camera photographing the first reference image as a second reference image; determining, for an adjacent image located at the same side of the first reference image and the second reference image and taken currently by another camera, a brightness correction value of the adjacent image according to a first brightness difference and a second brightness difference of the adjacent image; and correcting the pixel brightness of the adjacent image according to the determined brightness correction value. The method of the invention can ensure the brightness consistency of a spliced image, make a fusion transition area more natural, and cause no occurrence of an obvious change of brightness to the whole spliced image, thereby facilitating the observation by a user and improving the user experience.

The invention discloses a display device comprising a display panel module and a back light module. The display panel module is provided with a display area. A first sub-display area and a second sub-display area, which are adjacent to each other, are disposed on the display area. The display panel module is disposed on the back light module. The display panel module is provided with a first average brightness and a second average brightness, after the light is reflected by the first sub-display area and the second sub-display area. The second average brightness is 1.2 times to 2 times of the first average brightness.

The invention provides a brightness adjustment method and device for splicing multiple cameras and a portable terminal. The method comprises the following steps of: acquiring original images of six cameras and corresponding six groups of overlapping region images; mapping the original image of each camera with a luminance mapping function to calculate a total error of image luminance of the six groups of overlapping regions; adjusting the brightness mapping function of each camera separately to minimize the total brightness error; adjusting the optimal mapping function and mapping for panoramic splicing to generate the darkest panoramic splicing image with the brightest part and the brightest panoramic splicing image with the darkest part; generating a panoramic mosaic image by fusing a dark panoramic mosaic image and a bright panoramic mosaic image. The technical scheme of the invention realizes the elimination of the brightness difference of the overlapping area by adjusting the brightness mapping function of the camera with independent exposure, keeps the details of the brightness and the darkness of the image unchanged, and better improves the visual effect of the panoramic image.

The invention provides a magnified backlight device made of a plurality of light guiding panel cells which are successively connected side by side with overlap, and particularly a magnified light guiding panel backlight device used for an advertising board, wherein the plurality of light guiding panel cells are connected side by side. A panel group receiving-supporting frame part provides a receiving space, wherein the receiving space is sufficiently large so that the receiving space is adapted to thermal expansion coefficient differences of the light guiding panels after the light guiding panel cell assemblies are received, supports the front part and the back part and does not fix the light guiding panel assemblies so that the light guiding panel assemblies can move laterally, and prevents deformation caused by the thermal expansion coefficient difference between the frame and the light guiding panel cell assemblies. One or a plurality of optical dispersion tubes are fixed to and cover connecting parts of the light guiding panel cells to perform optical dispersion function and separation function, the optical dispersion function compensates low brightness of the connecting parts via refraction and dispersion of light from the connecting parts of the light guiding panels and the adjacent zones, and the separation function is used for preventing an advertising film installed on the light guiding panel cell assemblies from getting close to the light guiding panels due to loosening caused by tension loosening.

A method for modifying color density values in a dot-based printing system uses a control unit. The control unit implements the modification of the color density values after a raster image has been created and modifies the number and/or size of print dots to be applied to a printing substrate in order to attain pre-defined color density target values.

The invention provides a display screen picture compensation method and device and display equipment, the display equipment comprises a display screen, and the display screen picture compensation method is applied to the display equipment and comprises the following steps: acquiring use information of the display screen, and determining that the display screen needs to be subjected to brightness compensation according to the use information; entering a verification mode and receiving verification information; the verification information is analyzed, and the position, needing brightness compensation, of the display screen is determined; and performing brightness compensation on the position, needing brightness compensation, of the display screen. According to the display screen picture compensation method provided by the invention, the verification information is analyzed, the position of the display screen needing brightness compensation is determined, and brightness compensation is carried out on the position of the display screen needing brightness compensation, so that the brightness of the position of the display screen where brightness decay occurs can be compensated in time; therefore, the brightness difference between the pixel points at different positions of the display screen is reduced or eliminated, and the burn-in problem of the display device of the OLED display screen is improved.

The invention discloses a brightness adjustment method and device. The method comprises the steps that a first coincidence view area and a second coincidence view area are determined for a first imageand a second image, wherein the first image and the second image are stitched; for each first brightness value, a first target brightness value corresponding to the first brightness value is determined; and according to the first target brightness value corresponding to each first brightness value, the brightness value of each third pixel point of the first brightness value in the first image isadjusted to the first target brightness value. According to the embodiment of the invention, according to each first pixel point of the first brightness value in the first coincident view area and thesecond brightness value of each second pixel point corresponding to each first pixel point in the second coincident view area, the first target brightness value corresponding to the first brightnessvalue is determined; the brightness value of each third pixel point of the first brightness value in the first image is adjusted to the corresponding first target brightness value; and the brightnessdifference at the stitching seam of the first image and the second image can be eliminated.

The invention provides a backlight source, a backlight module and a display device. The backlight source comprises a substrate, wherein a plurality of light-emitting unit groups are arranged on the substrate, each light-emitting unit group comprises at least one light-emitting unit, a first diffusion film corresponding to an area within the light-emitting angle of the light-emitting unit is arranged on the light-emitting side of the light-emitting unit, the reflectivity of the first diffusion film is greater than the transmissivity, for at least part of the light-emitting units, the substrate is further provided with a first reflection structure surrounding the light-emitting units, and the first reflection structure is used for reflecting light reflected by the first diffusion film in the direction of the area except the light-emitting angles of the light-emitting units. According to the scheme, the brightness difference between the light-emitting unit and the peripheral area can be effectively eliminated, the bad effect of lamp shadow is prevented, and the display effect is improved.

The present invention discloses an image recognition method and apparatus. The method comprises the following steps that: analysis signals are obtained from the analysis image of a face image, and the amplitude values of the analysis signals carry information characterizing illumination in the face image; the amplitude values in the analysis signals are normalized; and image recognition is performed on a face image which is reconstructed based on the normalized amplitude values. With the image recognition method and apparatus of the invention adopted, the technical problem of relatively low recognition rate of face recognition can be solved.

The invention relates to a gray value-based cell picture splicing method, and the method is characterized in that the method comprises the following steps: (1) shooting and collecting cell pictures; (2) carrying out color conversion on the cell picture, and converting the cell picture from an RGB (Red, Green and Blue) channel to a gray channel; (3) removing noisy points from the cell picture through Gaussian filtering or mean filtering; (4) carrying out dislocation subtraction on the cell picture to eliminate a brightness difference; (5) randomly selecting a region A on the cell picture, moving a sliding block in the region A for multiple times, calculating the mean square error of the region A, and finding out a matching region A1 with the maximum brightness change through the mean square error; (6) calculating a matching error by applying a template matching method, and finding out a point P with a maximum or minimum difference value according to an error range. The method is simple in algorithm and wide in application range, the optimal matching point can be quickly and accurately found, and quick splicing of the cell pictures is realized.

The embodiment of the invention provides a compensation method and device of a display panel and a computer readable storage medium. The display panel comprises a first display area and a second display area. The method comprises the following steps: acquiring a plurality of first brightness compensation values of different gray scales, a plurality of second brightness compensation values of different temperatures and a plurality of third brightness compensation values of different brightness levels under different use durations in advance; determining a first brightness compensation value of the current gray scale, a second brightness compensation value of the current temperature and a third brightness compensation value of the current brightness level under the current use duration when the current use duration is greater than or equal to the first duration threshold value; according to the determined first brightness compensation value, the second brightness compensation value and the third brightness compensation value, determining a data voltage compensation amount or a duty ratio of a light-emitting control signal; and performing brightness compensation on the first display area based on the data voltage compensation amount or the duty ratio of the light-emitting control signal. According to the embodiment of the invention, the brightness attenuation difference between the first display area and the second display area can be eliminated.

The invention relates to a display control method and device, electronic equipment and a computer readable storage medium, and the method comprises the steps: according to a preset general compensation amount, increasing the brightness of pixel light emission in a first display area, and/or reducing the brightness of pixel light emission in a second display area; acquiring a preset customized compensation amount of the current display panel; and according to a preset customized compensation amount, adjusting the brightness of the light emitted by the pixels, the distance between which and the second display area is smaller than a preset distance, in the first display area, and/or according to the preset customized compensation amount, adjusting the brightness of the light emitted by the pixels, the distance between which and the first display area is smaller than the preset distance, in the second display area. According to the embodiment of the invention, the brightness difference of the junction of the first display area and the second display area can be accurately eliminated for each display panel, so that the brightness of the junction of the first display area and the second display area has continuity, an obvious boundary is not easy to be observed by a user, and a good viewing effect is ensured.