24 results about "Correction method" patented technology

This invention has as its object to eliminate sensitivity nonuniformity on the plane of an image sensing element irrespective of exchange of a lens. To achieve this object, in an image sensing apparatus which has an image sensing element and can exchange a lens, a memory stores shading correction coefficients respectively corresponding to pixels in a two-dimensional matrix on the plane of the image sensing element, and a correction device makes a correction calculation of pixel data read out from each pixel of the image sensing element by extracting the shading correction coefficient associated with the corresponding pixel from those stored in the memory.

The invention discloses a method for correcting feedback of an inertial navigation system/global position system (INS/GPS) combined navigation system based on lever arm estimation. The method comprises the following steps of: extending a lever arm error to a system error state vector for estimation, judging whether a random error of an inertial device is accurately estimated through comparing whether the difference between a lever arm estimation value and a true value exists in an error threshold range, wherein the error of the inertial device is effectively estimated when the error of the lever arm estimation value is smaller than a set threshold value, measured outputs of a gyroscope and an accelerometer are corrected by utilizing the error of a random constant of the estimated inertial device, and unity feedback correction is performed during combined Kalman filtering, otherwise, feedback correction is not carried out on the error of the inertial device. According to the method, the error of the random constant of the inertial device can be subjected to effective estimation and unity feedback correction, and the precision of the INS/GPS combined navigation system can be effectively improved.

The invention discloses a projector distortion correction method and device and a projector. The method comprises the following steps: projecting a standard grid image on a projection plane by using an optical machine lens, and shooting the projection plane by using a camera to obtain a projection point cloud image; according to the pixel point corresponding relation between the standard grid image and the projection point cloud image and the three-dimensional projection model, obtaining three-dimensional coordinates of grid points on the projection surface based on an optical-mechanical lenscoordinate system; obtaining a reference projection plane and projection points of the grid points on the projection plane on the reference projection plane by utilizing the three-dimensional coordinates of the grid points on the projection plane, and obtaining texture sampling coordinates corresponding to each pixel point of the grating pixel plane; and performing texture mapping on the image tobe projected by using the texture sampling coordinates, and outputting the image subjected to texture mapping to the grating pixel surface for projection. According to the technical scheme provided bythe invention, the image projected to the non-flat projection surface by the projector presents a non-distortion effect.

The invention relates to a correction method for updating a DEM (digital elevation model) by the aid of ground based SAR (synthetic aperture radar). The correction method includes computing an amplitude image of the SAR according to received complex-domain echo data of the ground based SAR; extracting corner reflector points of the ground based SAR image; registering the ground based SAR image and an optical image; acquiring ground based SAR image data received by two antenna sensors; respectively correcting phases of the two images; computing coherence of interference patterns of two antennas; unwrapping the phases; computing path difference of corrected slope distance signals and reducing inaccurate measurement errors of base line components B<h> and B<v> of the sensors; completing final elevation calibration work by the aid of ground elevation control points; three-dimensionally superimposing and displaying the ground based SAR image, the optical image and the updated DEM. The correction method has the advantages that approximation is omitted in processing procedures, the optical image and the ground based SAR image can be registered, the DEM can be updated in correction procedures, accordingly, the multi-source data can be precisely corrected, and excellent three-dimensional processing result displaying effects can be realized.

A calibration and rectification method includes arranging a monitor vertically relative to the optical axis of the stereo camera; displaying 3D patterns, similar to patterns obtained by projecting pattern images of various postures produced by a panel virtually located in front of the stereo camera, onto the monitor through a 3D graphical technique; and the stereo camera acquiring the 3D patterns displayed on the monitor to perform calibration and rectification, thereby correcting images of the stereo camera.

The embodiment of the invention discloses an LTE receiving channel delay correction method, a device and a base station with the device. The method comprises the steps of receiving uplink sounding signals of multiple users with multiple antennas; selecting a user from multiple users as a set user, and according to the uplink sounding signal of the set user acquiring the power delay spectrum of the set user in each receiving channel; according to the power delay spectrum of each receiving channel respectively acquiring the delay value of each receiving channel; and according to the delay value of each receiving channel respectively carrying out delay adjustment on each receiving channel. In this embodiment, the characteristic that the LTE system needs to employ the sounding signal of the user and a power delay spectrum estimation algorithm to compute the PDP estimation so as to obtain the power delay spectrum is employed, and then the delay adjustment value is obtained according to the power delay spectrum, thus the delay correction of the radio frequency receiving channel in the base station is realized.

A medical image inclination correction method based on a B spline is provided. The method comprises the steps of acquiring the medical image to be corrected, and performing binarization processing onthe medical image to be corrected to obtain a binary medical image; carrying out edge detection on the binary medical image according to the B spline gradient operator, and obtaining a binary edge image; calculating the bounding box of the edge image to obtain the actual size of the edge image, and then capturing the sub-image of the medical image to be corrected according to the actual size of the edge image; calculating the mass center of the sub-image and the normalized center moment to obtain a rotation angle; reversely rotating the medical image to be corrected according to the rotation angle to obtain the corrected medical image, so that the correction of the inclination image with uneven gray level can be realized.

An image stabilization control apparatus acquires information regarding a shutter speed related to image capturing that is to be performed by the image capturing apparatus, and controls to cause a first correction unit and a second correction unit that respectively employ different correction methods, to correct shake of the image capturing apparatus. The image stabilization control apparatus changes the allocation of correction of the shake to the first correction unit and the second correction unit based on information regarding the shutter speed.

This invention relates to a method for identifying odd-even field of digital video signals, in which, a video vidicon gets an original video flow as the input, which enters into the computer after being changed to a video data flow by a video collection card to be processed, operated by the computer, which reverses the odd-even sequence of the input video sequence once and compares the edge energies of the original input video sequence with that of the reversed one, and the smaller one is the correct one and is output so as to get video signals with correct field sequence.

The image projection system includes a projection-type display apparatus that projects an image onto a projection plane and has a first azimuth detector, the first azimuth detector detecting a projection azimuth; an imaging apparatus that images a projection screen of the image and has a second azimuth detector, the second azimuth detector detecting an imaging azimuth; and a signal processor that performs correction processing of the image. The signal processor includes an estimation unit and a correction unit, the estimation unit estimating an inclination of the projection-type display apparatus to the projection plane on the basis of the projection azimuth detected by the first azimuth detector, the imaging azimuth detected by the second azimuth detector, and the captured image acquired by the imaging apparatus; and the correction unit correcting a shape of the projection screen on the basis of the inclination of the projection-type display apparatus estimated by the estimation unit.

The invention relates to a serial communication checking and correction method. The serial communication checking and correction method employs an ECC (error checking and correction) mode to a serialcommunication checking and correction process and comprises: 1) saving, by a serial data transmitter, a frame of serial data to a transmitting buffer area; 2) calculating ECC codes of data frames in the serial port transmitting buffer area; 3) saving, by a serial data receiver, the received serial data to a receiving buffer area, and saving the received transmitter ECC codes to an ECC buffer area;4) calculating ECC codes of data frames in the serial port receiver buffer area; 5) subjecting the calculated transmitter ECC codes and receiver ECC codes to logic XOR operation, judging whether communication errs according to processing results, and correcting error information. The serial communication checking and correction method is particularly suitable for use in embedded service environments, especially in industrial liquid crystal displays that require transmission of mass data.

The invention discloses a multi-spectral imaging illumination space non-uniformity correction method. The multi-spectral imaging illumination space non-uniformity correction method comprises the stepsof: firstly, shooting a multi-spectral image of a target object by utilizing a multi-spectral camera under an illumination light source, keeping the position of the multi-spectral camera the same, putting a space uniformity correction white board at the position of the target object, covering the whole target object, shooting the multi-spectral image of the correction white board, covering the lens of the multi-spectral camera by using a lens cover, acquiring the dark field image of the multi-spectral camera, respectively deducting the dark field image by the multi-spectral images of target object and the correction white board, and correcting the multi-spectral image of the target object channel by channel by utilization of the multi-spectral image of the correction white board. The method disclosed by the invention has the characteristics of being capable of eliminating influence of the illumination space non-uniformity of the illumination light source onto the multi-spectral imaging, and improving the multi-spectral imaging quality.

The invention provides a color shading correction method and device capable of accurately correcting color shading of an image. The method comprises: a first image is received; a hue value of a firstpixel point in the first image in which a gradient is lower than or equivalent to a threshold is extracted; a transformation coefficient of the first pixel point is determined by using the hue value of the first pixel point and a feature contour of the first pixel, the feature contour is used for representing a feature of a color shading contour of a pixel point in the image that is obtained by statistically analyzing multiple standard light sources, and the transformation coefficient is used for representing the degree of strength of the feature contour; a color shading contour of a second pixel point in the first image is determined according to the transformation coefficient of the first pixel point and a color shading model; a color shading of the second pixel point is corrected according to the color shading contour of the second pixel point.

The invention discloses an image tilt correction method and a computer-readable storage medium. The method comprises the following steps: obtaining an inclination angle between a current scanning direction of a laser scanning device and a standard scanning direction; Calculating a trajectory to be scanned in the current scanning direction of the laser scanning device according to the inclination angle and the standard scanning trajectory in the standard scanning direction; According to the trajectory to be scanned, a driving signal corresponding to the trajectory to be scanned is determined, and the laser scanning device is driven based on the driving signal corresponding to the trajectory to be scanned. The above scheme is used to solve the problems existing in the prior art that When thelaser scanning imaging equipment is projected, it has high requirements on the placing environment or the grip mode of the user, which is easy to be disturbed by the external environment and the picture stability is poor. Therefore, the laser scanning imaging equipment can keep the scanning picture stable by controlling the driving signal when the projection angle is tilted due to the external environment disturbance.

The invention belongs to the field of energy metering, and relates to a self-healing precision correction method for a supersonic heat energy metering device. The method comprises the following main technological steps: firstly carrying out the hardware configuration of the supersonic heat energy metering device; secondly selecting a conventional TG840 main control chip and a TDC-GP22 time chip; thirdly setting a conventional zero-returning algorithmic program of static zero time difference of the supersonic heat energy metering device in the chips; fourthly setting a conventional program which obtains time difference through a peak value and a minimum value in the main control and time chips; and finally carrying out the non-linear correction of the supersonic heat energy metering device through a function of self-healing correction of the metering device. The method effectively eliminate the impact on metering precision from the factors (physical asymmetry, time drift, pipe bubbles and on-site noise) of an electronic circuit, enables the metering device to be simple in the overall structure, and enables the time measurement precision to be high.

The invention discloses a photo angle correction method based on digital image processing. The photo angle correction method comprises the following steps: inputting a source image; inputting four control points of a quadrilateral region needing angle correction into the source image; extracting an area needing to be corrected from the source image; deriving a projection transformation formula based on a central projection transformation principle; finding original image pixel point coordinates corresponding to the new image pixel point coordinates according to the transformation parameters; assigning a value to the new graph through nearest neighbor interpolation; and outputting corrected images. According to the invention, the quadrilateral area can be quickly and effectively projected into the rectangular area for angle correction of the image.