38results about How to "Improve calibration results" patented technology

A camera calibration system for cameras of a vehicle includes a plurality of cameras disposed at a vehicle and having respective fields of view exterior of the vehicle, with the fields of view of two of the cameras overlapping. While the vehicle is moving, an image processor of a control processes image data captured by the two cameras to determine and track matching features in an overlapping region of the fields of view of the two cameras. The control, responsive to image processing of image data captured by the two cameras, determines motion of matching features and minimizes a cost function of the error in the matching of the features. The camera calibration system uses the determined minimized cost function to refine calibration results of the two cameras using a feedback loop.

The invention relates to an image postprocessing method for removing a metal artifact from a computed tomography (CT) image, which comprises the following steps of: converting an original CT image into a polar coordinate image from an orthogonal coordinate image; determining a metal projection region in the polar coordinate image; establishing a model in the polar coordinate image; performing model correction by adopting the model; correcting front and back projection errors brought into the model correction; and converting the polar coordinate image into the orthogonal coordinate image. According to a model establishing method provided by the invention, the good model can be established, and finally, a good correction result can be obtained; the errors brought in by front and back projection are corrected, so that the result after the correction is better, and the processing speed is ensured.

Provision is made of a semiconductor radiation source having a base body on which at least two LED chips are mounted, at least one chip of which is connected to a series resistor which can be adjusted. The LED chips (12, 14) are fitted to the base body (24) using a thermally conductive connection and at least one printed circuit board (30) which bears the series resistor (40, 42) is also mounted on the base body (24).

The invention discloses an error calibration and compensation method for an accelerometer unit of an inertially stabilized platform system. When the inertially stabilized platform system is in a stationary base state, the platform body achieves six orthogonal positions relative to the inertial space; through data processing on the accelerometer unit, 15 error coefficients can be calibrated and isolated; and after error compensation, the fitting residual error can be significantly reduced. Compared to other calibration method of error coefficient, the method completes error coefficient calibration and compensation of three axis accelerometers in the inertially stabilized platform system, not only improves the precision of error coefficient calibration, but also realizes simple calibration process and short time.

The invention discloses a relative radiation correction method based on pseudo-invariant feature point classification and layering, and belongs to the field of remote sensing image radiation correction. An existing radiation correction method is low in correction precision of relative radiation on remote sensing images including coastlines, islands and the like occupying dominant ground object areas. The method comprises the steps of 1, obtaining ground object sub-images based on remote sensing image classification; 2, determining an initial relative radiation correction model and an initial PIFs of the ground object sub-image based on nonlinear regression analysis of the spectrum; 3, based on gradient-based fine nonlinear regression analysis, determining a fine nonlinear relative radiation correction model and a fine PIFs of the ground object sub-image; 4, performing relative radiation correction on the to-be-corrected surface feature sub-image by using the refined PIFs and the refined nonlinear relative radiation correction model; and 5, synthesizing the corrected image into a complete image. The method is applied to the field of remote sensing image radiation correction.

The invention discloses an adaptive brightness unevenness variation correction method based on a Retinex variation framework and aims to provide an adaptive correction method to realize no logarithm transformation, eliminate a non-uniform image brightness phenomenon and effectively keep image colors and the detailed information. The method is characterized in that an optical imaging detection system is utilized to acquire an uneven degeneration image as an observation image; an adaptive weight function is constructed according to space characteristics of the observation image; an original Retinex theory is utilized to construct a variation correction model, total variation regularization constraint intensities of a reflection component in the variation correction model at different pixel points are adaptively controlled through the weight function, and a mean value of the reflection component is employed to approximate gray mean constraints to prevent local overexposure; a split Bregman iteration method and an alternative minimization method are then utilized to solve the variation correction model to acquire an illumination component and the reflection component, and the reflection component is lastly rounded to acquire a correction image.

The invention discloses a camera self-calibration method based on IOS-PSO (Internetwork Operating System-Particle Swarm Optimization). The method is relatively simple in algorithm, high in efficiency and high in optimizing result precision. The method mainly comprises three steps: S1, establishing an internal parameter-based cost function of a camera; S2, performing IOS-PSO on the cost function; and S3, limiting a rule for an IOS-PSO search result. The method comprises the following specific steps: acquiring four pictures of different angles of the same scenario; extracting and matching image feature points; solving three basis matrixes F by using the matched points and adopting an RANSAC (Random Sample Consensus) method, and then performing SVD (singular value decomposition) on the basis matrixes to construct the cost function as a fitness function of particle swarm optimization; dividing a set initial search interval, and setting a research rule according to the optimal value; taking five unknown internal parameters fu, fv, u0, v0 and s to be calibrated in the camera as particle elements of a particle swarm; performing IOS-PSO search; and if the search result accords with the search rule, selecting the final search result, otherwise, searching again. Contrast experiments of four algorithms verify that the calibration result of the method is accurate, stable and efficient.

The embodiment of the invention discloses a method for triggering re-correction and a related device, which are applied to electronic equipment. The method comprises the following steps: selecting a target verification point of a display screen of the electronic equipment; detecting an algorithm output point of the user watching the display screen, wherein the algorithm output point is the watching position of the eyes of the user on the display screen calculated by the electronic equipment; determining whether the algorithm output point is successfully corrected according to the target verification point and the algorithm output point; and if not, triggering re-correction. According to the embodiment of the invention, the correction effect is improved, and the gaze accuracy is improved.

The invention provides a glue dispensing device. The glue dispensing device comprises a glue dispensing mechanism and a correction mechanism. The glue dispensing mechanism is used for forming a firstglue path. The correction mechanism is coupled to the glue dispensing mechanism and comprises a detection unit. The detection unit is used for detecting the glue width of the first glue path and detecting the distance difference between the first glue path and a reference line set. The glue dispensing mechanism forms a second glue path according to the glue width and the distance difference. The invention further provides a glue dispensing method of the glue dispensing device.

The invention discloses an angled side-mounted fisheye image correction method of equipment. The method comprises the following steps: extracting a fisheye effective range; carrying out barrel distortion rough correction on images; carrying out angle correction on the images; cutting the corrected images in an effective range; performing Bezier curves back projection transform on the images for three times; cutting a result image in the effective range. According to the angled side-mounted fisheye image correction method of the equipment disclosed by the invention, an effective area ratio of the acquired original fisheye images is maximized; moreover, the acquired fisheye images during side mounting at a certain angle are rectified at a certain angle, and a good correction effect on the fisheye images is achieved. In addition, by utilizing the method disclosed by the invention, cutting of image contents to a minimum extent can be corrected, and the maximization of the effective monitoring area can be ensured.

The invention discloses a processing method and a processing system for earthquake strong amplitude abnormity. The processing method comprises the following steps: respectively extracting earthquake wavelets of a stable sedimentary stratum on a strong amplitude abnormity interface, earthquake wavelets of a stable sedimentary stratum on a strong amplitude abnormity interface and earthquake waveletsof a stable sedimentary stratum on a strong amplitude abnormity interface; obtaining an average reflection coefficient body; acquiring the seismic wavelets of the stable sedimentary strata on the high-amplitude abnormal interface and average wavelets of seismic wavelets of the stable sedimentary strata on the high-amplitude abnormal interface; and based on the average reflection coefficient bodyand the average wavelet, obtaining seismic data for eliminating strong amplitude abnormity. According to the method, the seismic wavelets of the high-amplitude abnormal interface and the upper and lower stable sedimentary stratums are extracted, the seismic data with the high-amplitude abnormality eliminated are obtained through convolution of the average reflection coefficient body and the seismic wavelets of the stable sedimentary stratums, effective signals cannot be lost, and then the correction result is improved.

An endless belt aplanatic spherical surface lens, the characteristic is: divides the two spherical surfaces the spherical surface simple lens into N endless belts with different caliber, every endless belt processes translation relative the base spherical surface along the light axis on the same spherical surface, the translation distance is descending in turn from smaller endless belt to the bigger endless belt, confirms the value of N, the caliber of every endless belt and the translation quantity of every endless belt on the axis direction according to the aplanatic requirement of the practice application. The advantages of the invention are: for the light paralleling with the light axis can get the better aplanatic revise result; the surface structure of the lens is sample.