tailieunhanh - Advances in Flight Control Systems Part 13

Tham khảo tài liệu 'advances in flight control systems part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Autonomous Flight Control for RC Helicopter Using a Wireless Camera 227 Calculation of the attitude angle of RC helicopter The relation between an angle of RC helicopter and an image in the camera coordinate system is shown in . When RC helicopter is hovering above a circular marker the circular marker image in the camera coordinate system is a right circle like an actual marker. If RC helicopter leans the marker in a camera coordinate system becomes an ellipse. To calculate the attitude angle first the triangular cut part of the circular marker is extracted as a direction feature point. Then the deformation of the marker image is corrected for calculating a yaw angle using the relation between the center of the circular marker and the location of the direction feature point of the circular marker. The pitch angle and the roll angle are calculated performing coordinate transformation from the camera coordinate system to the world coordinate by using the deformation rate of the marker in the image from the wireless camera. Camera coordinate Fig. 14. Relation between attitude angle of RC helicopter and image in wireless camera. Calculation of a yaw angle The value of yaw angle can be calculated using the relation of positions between the center of circular marker image and the direction feature point of the circular marker image. However when the marker image is deforming into the ellipse an exact value of the yaw angle cannot be got directly. The yaw angle has to be calculated after correcting the deformation of the circular marker. Since the length of the major axis of the ellipse does not change before and after the deformation of marker the angle a between x axis and the major axis can be correctly calculated even if the shape of the marker is not corrected. As shown in the center of a marker is defined as point P the major axis of a marker is defined as PO and the intersection point of the perpendicular and x axis which were taken down from .

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