A block matching and optical flow method combined foundation cloud picture motion prediction method

Abstract

The invention discloses a block matching and optical flow method combined foundation cloud picture motion prediction method, which comprises the steps of extracting a cloud region by utilizing cloud classification information for an acquired foundation all-sky image, calculating a main motion vector of the cloud region by adopting a block matching method, and taking a result as one of constraint items of an optical flow method; forming an optical flow method energy function jointly by the main motion vector, a brightness constant item, a global smooth item and a brightness gradient item; adding weighted median filtering to each layer of pyramid in the optical flow method cloud motion field calculation process, thus reducing the influence of a motion vector abnormal value, and realizing rapid and accurate prediction of cloud motion of a foundation all-sky image. Aiming at the problems of low block matching prediction precision, long calculation time of an optical flow method, light sensitivity and the like, the method of the invention improves the speed and precision of cloud motion prediction of an all-sky image by combining block matching with the optical flow method and fully utilizing the advantages of high block matching speed and high precision of the optical flow method.

Description

technical field [0001] The invention belongs to the field of photogrammetry and remote sensing, and in particular relates to a ground-based cloud image motion prediction method combining block matching and optical flow method. Background technique [0002] The amount of solar radiation reaching the ground may fluctuate greatly in a short period of time. The shielding of clouds is the key factor leading to changes in the amount of radiation. When the relative position of the clouds and the sun changes, it will cause drastic fluctuations in the amount of radiation. The movement position and direction of the inner cloud is the key to predict the change of solar radiation. The ground-based all-sky imager that obtains cloud observation data is installed at a fixed location, and can obtain a certain range of all-sky images in the area, and its time resolution is generally 30 seconds. Using this instrument, cloud identification, cloud motion field prediction and short-term Solar i...

AI Technical Summary

Problems solved by technology

[0007] This method mainly solves the problems of low accuracy of cloud motion prediction by block matching, long calculation time and light sensitivity of optical flow method prediction, and proposes a ground-based cloud image motion prediction algorithm combining block matching and optical flow method

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