3 results about "Symmetric axis" patented technology

The application discloses a solar meridian extraction method, device, equipment, medium and product, relates to the technical field of atmospheric polarized light navigation, and comprises the following steps: acquiring an original polarization image of a target area; in a Cartesian coordinate system, determining a linear polarization degree of an effective data area according to the original polarization image; performing coordinate system conversion on the linear polarization degree and determining an optimal symmetry axis based on a mirror symmetry principle; extracting a polarization angle corresponding to the effective data area based on the linear polarization degree of the effective data area; performing complex conversion and coordinate system conversion on the polarization angle corresponding to the effective data area to determine an antisymmetric polarization angle; extracting a skip line estimation value by using an antisymmetric mode according to the antisymmetric polarization angle; and fusing the optimal symmetry axis and the skip line estimation value through time series filtering to obtain a solar meridian. The application can improve the extraction precision of the solar meridian, thereby improving the precision of heading estimation.

The application discloses a kind of construction curve generation method, including the following main steps: S1, the first arch of standard cycloid is selected as the basis arc segment of construction curve half section;S2, the second arch of standard cycloid is copied after mirror image with straight line y=2r as the axis of symmetry, and the basic unit of construction curve is obtained;S3, the basic unit obtained in S2 is copied 2 (n-1) along the positive direction of x axis, and then copied 4 (n-1) r along the positive direction of y axis, that is, the nth basic unit (n=2, 3, 4, 5,...) of construction curve can be obtained, and the curve formed by the connection of the n basic units forms a complete construction curve.The application also discloses a flow channel structure and a printed circuit board heat exchanger.The application can improve the average rate of medium flow, reduce the flow dead space in the transition area of wave crest and wave trough, enhance the disturbance of fluid medium in the channel, thereby destroying the flow heat transfer boundary layer to achieve the purpose of heat transfer enhancement.

The application discloses a kind of musical instrument audio signal intelligent analysis methods based on clancy figure, it is related to musical instrument manufacturing technical field, steps include: obtaining clancy figure, extracting symmetry axis angle distribution and wood texture main direction and obtaining offset angle;Wood texture anisotropic distribution area is identified based on offset angle, determine abnormal resonance energy propagation path, combine edge detection calculation panel vibration uniform area ratio, obtain resonance frequency purity percentage;With offset angle, correlation strength is constructed, input preset mapping obtains length-width modulus ratio fusion result, combined with finite element simulation to obtain panel cutting angle adjustment amount;According to adjustment amount, update modulus ratio, geometric symmetry coverage area ratio and energy dissipation space position distribution;Compare distribution before and after optimization, evaluate abnormal resonance amplitude reduction and symmetry axis angle distribution, determine the matching relationship and optimization direction of texture and symmetry axis, output final cutting angle scheme.