Method for obtaining included angel between a lens plane and an image sensor plane

Abstract

The invention provides a method for obtaining an included angle between a lens plane and an image sensor plane. The method includes steps of 1, collecting an image by an image collecting device; 2, designing a mark board and marking a plurality of mark points in the mark board, wherein the size of the mark board is equal to the image; 3, positioning the central position of the marking points by adopting image segmenting, detecting and identifying technology; and 4, calculating the included angle in the horizontal direction and the vertical direction between the lens plane and the sensor plane through included angle testing software. Two mark points are connected so as to form a straight line, an included angle between two symmetric straight lines in the horizontal direction and an included angle between two symmetric straight lines in the vertical direction are calculated. The Tilt in the horizontal direction and the Tilt in the vertical direction can be obtained through included angles between straight lines. Finally, the included angle between the lens plane and the sensor plane is detected. The method is low in time consumption and high in precision. Module quality can be reflected accurately.

Description

technical field [0001] The invention relates to the field of testing methods for the angle (Tilt) between a lens (Lens) plane and an image sensor (Sensor) plane, in particular to a method for quickly obtaining the Tilt between a Lens plane and a Sensor plane. Background technique [0002] In recent years, with the increasingly fierce competition in the mobile phone lens market and the development of chip technologies such as CCD or CMOS, the pixel size of the chip is getting smaller and smaller, and the imaging quality requirements of the matching optical system are also getting higher and higher. It promotes the research and development of the camera, and makes the camera lens develop rapidly in the field of miniaturization and high pixel, so as to meet people's demand for image quality. [0003] With the rapid development of the mobile phone industry, the module manufacturing process requirements have been improved accordingly. Modern mobile phone camera modules have small...

AI Technical Summary

Problems solved by technology

[0004] Traditionally, the defocus curve is used to calculate the Tilt between the Lens plane and the Sensor plane. This method requires the motor to run a certain stroke to obtain multiple images for calculation, which takes a long time. Therefore, the problem to be solved by the present invention is Quickly and accurately obtain the Tilt between the Lens plane and the Sensor plane

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