Infrared LED light source light pen measurement system adaptive lighting adjustment method

Abstract

The invention relates to the technical field of a light pen type coordinate measurement system and aims to solve a problem that existing light pen adaptive luminescence adjustment is susceptible to interference and low in efficiency and weak in adjustment ability and enable a light pen to be adaptively adjusted to an ideal imaging state quickly under various conditions. The adaptive luminescence adjustment method for an infrared light source light pen measurement system is characterized in that a double exposure sampling technology is adopted to perform acquisition on a light pen luminescence image, an image of a non-luminous light target is acquired firstly, then an image of the luminous light target is acquired, and a final image is acquired by subtracting the two images; adaptive luminescence adjustment is adopted in the double exposure process, wherein the adaptive luminescence adjustment is conducted in two steps which are firstly coarse adjustment for the exposure time of a camera and secondly fine adjustment for current of each LED, and finally all light target images are adjusted to conform to requirements. The adaptive luminescence adjustment method is mainly applied to design and manufacture occasions of the light pen type coordinate measurement system.

Description

technical field [0001] The invention relates to the technical field of a light pen type coordinate measuring system, in particular to an adaptive lighting adjustment method for an infrared LED light source light pen measuring system. Background technique [0002] The light pen type three-coordinate measuring system is a widely used portable measuring device. In addition to the advantages of high precision and wide measurement range, it also has excellent hidden point measurement capabilities. The measurement principle of the light pen is to take the image of the light target on the light pen, and then calculate the coordinates of the light pen probe according to their projected position in the image and combined with the spatial relative position of the light target, so the positioning accuracy of the light target projection point directly affects the measurement accuracy of the light pen system . Infrared LEDs have good luminescence and imaging characteristics, and are oft...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the existing technology and solve the problems of the existing light pen adaptive light adjustment, which are susceptible to interference, low efficiency, and weak adjustment ability, the present invention proposes an efficient adaptive light adjustment method, which adopts a two-step method for camera exposure and light adjustment. The joint control of the target current enables the light pen to quickly and adaptively adjust to the ideal imaging state under various conditions

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