Electronic image stabilization method based on characteristic straight line of ship-borne camera system

Abstract

The invention discloses an electronic image stabilization method based on the characteristic straight line of a ship-borne camera system, belongs to the technical field of image processing and solves the instability problem of the video images of the ship-borne camera system in the sailing process of the ship. The method comprises the following specific steps: (1) selecting a reference frame, reading the current frame; (2) performing image binarization; (3) using sobel operator to perform edge detection to the binary image; (4) adopting hough transform to extract the discontinuous sea-sky-line in the image, utilizing the least square method to fit the sea-sky-line and obtain a continuous characteristic straight line; (5) performing horizontal projection to the characteristic straight line; (6) solving the equation of the straight line; (7) calculating the offset Delta y; (8) calculating the offset Delta theta; and (9) translating the current frame Delta y vertically and rotating the current frame Delta theta to realize image stabilization. The method fully utilizes the characteristic that the sea-sky-line always exists during the sailing process to reduce too many characteristic selections and characteristic matchings; and the method is characterized by good real-time, easy realization method, low computation complexity and the like.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an electronic image stabilization method, which can be applied to the image stabilization technology of a ship-mounted camera system. Background technique [0002] Electronic image stabilization technology has been verified and widely used in the field of image stabilization. As the carrier of the camera system, ships are often affected by wind and waves, resulting in large changes in hull attitude and severe hull vibration, making the image information obtained on the monitor unstable. , The blur phenomenon is very serious, so the shipboard electronic image stabilization technology has also emerged as the times require. [0003] There are many methods of electronic image stabilization at the present stage, such as the disclosed "electronic image stabilization method and system" patent application (publication number is CN101692692A), this method mainly inter...

AI Technical Summary

Problems solved by technology

This method uses the vector block segmentation method to solve the real-time problem of the optical flow method, which ensures a certain real-time performance, but there are still many shortcomings: First, the algorithm uses feature point matching, when the feature point selection When it is less, although the amount of calculation in the process is reduced, the high accuracy of matching cannot be guaranteed, resulting in low accuracy of parameter solution; when more feature points are selected, the amount of calculation in the matching process will be greatly increased

Second, the algorithm uses the optical flow field at the same time, and the optical flow field solution technology is difficult to guarantee the real-time performance of image stabilization

In this algorithm, the vector block segmentation method is used to alleviate the real-time problem caused by the optical flow field, but the real-time problem still exists.

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