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98results about How to "Effective registration" patented technology

SAR image registration method based on salient division sub-region pair

The invention provides an SAR (Synthetic Aperture Radar) image registration method based on a salient division sub-region pair. The SAR image registration method comprises the following steps: 1) inputting SAR images of two time phases in the same region; 2) carrying out average filtering and histogram equalization on the two SAR images to suppress coherent spots; 3) carrying out salient region division based on frequency spectrum residual error on the two filtered and equalized images; 4) calculating a minimum euclidean distance between the saliently divided region of the two images by utilizing a histogram mode-sorted grayscale sequence; 5) calculating registration parameters for a matching region by utilizing an improved comprehensive learning particle swarm optimization algorithm; 6) converting the registration parameters into registration parameters of an original image pair by utilizing a coordinate relationship between a sub-region in which a pixel point is positioned and an original image to obtain final registration results. The SAR image registration method solves the registration problem under a situation of non-ideal region division consistence through an existing method and the problem of large registration calculation amount based on grayscale information, and is used for change detection, terrain classification, map correction, data fusion and the like.
Owner:XIDIAN UNIV

Improved optical flow field model algorithm based on characteristic vector

The invention discloses an improved optical flow field model algorithm based on a characteristic vector. The improved optical flow field model algorithm comprises the steps of respectively constructing Gaussian pyramid image layers of a reference image and a floating image, respectively extracting character vectors of the reference image layer and the floating image layer; replacing a brightness constancy assumption in a traditional optical flow field model by characteristic vector constancy, and constructing an energy function based on characteristic vector constancy; minimizing an energy function in each image layer, and solving a motion displacement field between the reference image and the floating image by means of optical flow iteration; and correcting the floating image by means ofthe obtained motion displacement field, and obtaining a registering image. The improved optical flow field model algorithm performs improvement for aiming at incapability of effectively registering large-displacement deformation and easy smoothing in optical flow estimation in a traditional optical flow field model, thereby improving registering precision of a non-rigid image. The improved opticalflow field model algorithm can perform automatic registering on the non-rigid image with relatively large displacement deformation, and can be widely applied to the field of medical image processing,image fusion, mode identification, etc.
Owner:TIANJIN UNIV

Substation equipment image collection method based on focusing and exposure servo of specified area

The invention discloses a substation equipment image collection method based on focusing and exposure servo of a specified area. The method comprises the following steps: collecting a clear image of substation equipment and storing the clear image as template data; when a substation polling robot executes a polling task and removes to a preset position, collecting a polling image of concerned equipment by a camera; registering the template image and the polling image collected onsite by using a feature matching algorithm to find a concerned equipment area in the center of the polling image; and calculating clarity values of the equipment area in the polling image and the template image, comparing a ratio of the two clarity values with a set threshold, if the ratio is smaller than the threshold, deeming that the equipment area in the polling image is not clear enough, and if the ratio is greater than the threshold, deeming that the equipment area in the polling image is clear enough. According to the substation equipment image collection method disclosed by the invention, a specified area focusing servo function is adopted on the image area where the equipment is located, so that a camera focusing position can be guaranteed to locate on the equipment, and a clear image of the equipment is collected so as to ensure the accuracy of reading or state identification of the equipment.
Owner:STATE GRID INTELLIGENCE TECH CO LTD
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