Abstract: A method for measuring lens distortion, comprising: providing a test card having a dot matrix pattern of K×N dots, wherein the K and the N are both positive integer; obtaining a distorted image of the test card after being distorted by a lens; establishing a planar coordinate system for the distorted image by using a dot at an upper left corner of the distorted image as a coordinate origin, a rightward direction from the origin as a positive direction of axis X, and a downward direction from the origin as a positive direction of axis Y; positioning a center dot of the distorted image and all non-center dots by scanning and searching, and determining coordinate values of the center dot and all the non-center dots in the planar coordinate system; and calculating a distortion amount of the distorted image by using the coordinate values of the center dot and all the non-center dots according to a distortion amount calculation equation for the distorted image, thereby obtaining a distortion amount of the lens.

Abstract: A method for measuring lens distortion, comprising: providing a test card having a dot matrix pattern of K×N dots, wherein the K and the N are both positive integer; obtaining a distorted image of the test card after being distorted by a lens; establishing a planar coordinate system for the distorted image by using a dot at an upper left corner of the distorted image as a coordinate origin, a rightward direction from the origin as a positive direction of axis X, and a downward direction from the origin as a positive direction of axis Y; positioning a center dot of the distorted image and all non-center dots by scanning and searching, and determining coordinate values of the center dot and all the non-center dots in the planar coordinate system; and calculating a distortion amount of the distorted image by using the coordinate values of the center dot and all the non-center dots according to a distortion amount calculation equation for the distorted image, thereby obtaining a distortion amount of the lens.

Abstract: A method for measuring lens distortion, comprising: providing a test card having a dot matrix pattern of K×N dots, wherein the K and the N are both natural numbers (110); obtaining a distorted image of the test card after being distorted by a lens (120); establishing a planar coordinate system for the distorted image by using a dot at an upper left corner of the distorted image as a coordinate origin, a rightward direction from the origin as a positive direction of axis X, and a downward direction from the origin as a positive direction of axis Y (130); positioning a center dot of the distorted image and all non-center dots by scanning and searching, and determining coordinate values of the center dot and all the non-center dots in the planar coordinate system (140); and calculating a distortion amount of the distorted image by using the coordinate values of the center dot and all the non-center dots according to a distortion amount calculation equation for the distorted image, thereby obtaining a distortion

Abstract: A method for measuring lens distortion, comprising: providing a test card having a dot matrix pattern of K×N dots, wherein the K and the N are both natural numbers (110); obtaining a distorted image of the test card after being distorted by a lens (120); establishing a planar coordinate system for the distorted image by using a dot at an upper left corner of the distorted image as a coordinate origin, a rightward direction from the origin as a positive direction of axis X, and a downward direction from the origin as a positive direction of axis Y (130); positioning a center dot of the distorted image and all non-center dots by scanning and searching, and determining coordinate values of the center dot and all the non-center dots in the planar coordinate system (140); and calculating a distortion amount of the distorted image by using the coordinate values of the center dot and all the non-center dots according to a distortion amount calculation equation for the distorted image, thereby obtaining a distortion

Abstract: The present invention discloses an earphone vibrator detection device, system and method. The device of the present invention is suitable for detecting a headset vibrator, and being placed at the headband position of the headset during detection. The device comprises an acceleration sensor and a signal conversion module mutually connected; the acceleration sensor is configured to detect the acceleration information of the headband position when the headset outputs a specified audio, and convert the acceleration information into a voltage signal to be output to the signal conversion module; and the signal conversion module is configured to convert the received voltage signal into a digital signal to be output, so as to determine whether the vibration amplitude of the headset vibrator is qualified according to the output digital signal. The technical solution of the present invention solves the problem that the detection of a headset vibrator is currently conducted manually in a cumbersome and laborious manner.

Abstract: The present invention discloses an earphone vibrator detection device, system and method. The device of the present invention is suitable for detecting a headset vibrator, and being placed at the headband position of the headset during detection. The device comprises an acceleration sensor and a signal conversion module mutually connected; the acceleration sensor is configured to detect the acceleration information of the headband position when the headset outputs a specified audio, and convert the acceleration information into a voltage signal to be output to the signal conversion module; and the signal conversion module is configured to convert the received voltage signal into a digital signal to be output, so as to determine whether the vibration amplitude of the headset vibrator is qualified according to the output digital signal. The technical solution of the present invention solves the problem that the detection of a headset vibrator is currently conducted manually in a cumbersome and laborious manner.