CN-122016051-A - System for realizing automatic measurement of optical value

CN122016051ACN 122016051 ACN122016051 ACN 122016051ACN-122016051-A

Abstract

The application relates to the field of industrial intelligent manufacturing, in particular to a system for realizing automatic measurement of optical values, which adopts a strategy of visual guidance and physical touch, and integrating an optical probe and a visual calibration reference piece at the tail end of the triaxial displacement mechanism, and establishing a mapping relation between a pixel space and a physical movement space by matching with a global camera. And capturing the random pose of the reference piece through a vision system to finish hand-eye calibration, calculating coordinates of points to be measured based on image feature registration during measurement, and guiding a probe in a blind area to precisely contact a specific area of the workpiece by using a mapping function. The system effectively combines the positioning flexibility of machine vision and the measurement high precision of the single-point spectrometer while maintaining the constant temperature environment of the closed test space, and realizes the automatic optical value acquisition without manual intervention.

Inventors

ZANG DONGNING
HE SIRUI
LIU SIYAN

Assignees

杭州齐芯智光科技有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260226

Claims (7)

1. A system for enabling automated measurement of optical values, comprising: The environment simulation box body is used for defining an independent test space; the base support platform is horizontally and fixedly arranged on the inner bottom surface of the environment simulation box body; The three-axis gantry displacement mechanism is erected and fixed on the base support platform; the tail end executing bracket is mechanically connected with the Z-axis driving end of the triaxial gantry displacement mechanism and can move in space along with the driving of the X, Y, Z axes; The optical detection probe is detachably embedded in the tail end execution bracket; The visual calibration reference piece is flatly paved and adhered to the upper surface of the back of the optical detection probe; The global imaging camera is suspended on the top beam of the triaxial gantry displacement mechanism or the inner top wall of the environment simulation box body; The main control computing unit is used for receiving image data of the global imaging camera and test data of the optical detection probe and sending pulse control signals to the triaxial gantry displacement mechanism.
2. The system for automated measurement of optical values of claim 1, wherein the measurement aperture of the optical inspection probe is directed toward the base support platform.
3. The system for automated optical value measurement according to claim 1, wherein the characteristic center point of the visual calibration reference is maintained in alignment in a vertical direction with the measurement aperture center axis of the optical inspection probe.
4. The system for automated optical value measurement according to claim 1, wherein the global imaging camera is suspended on a top beam of the three-axis gantry displacement mechanism or an inner top wall of the environmental simulation box by a fixed bracket.
5. The system for automated optical value measurement according to claim 1, wherein the lens of the global imaging camera is looking down vertically and the field of view completely covers the motion range of the three-axis gantry displacement mechanism and the underlying base support platform.
6. The system for implementing automatic measurement of optical values according to claim 1, wherein the master control computing unit is configured to: controlling a triaxial gantry displacement mechanism to drive a visual calibration reference piece to traverse a plurality of random positions, and collecting physical coordinates of a sliding table at each random position and a calibration image containing the visual calibration reference piece; Extracting a pixel center coordinate in the calibration image, and performing linear regression fitting by utilizing an association corresponding relation between a physical coordinate of the sliding table and the pixel center coordinate to obtain a global coordinate mapping function; Controlling a global imaging camera to shoot a workpiece to be detected so as to acquire a real-time sampling image; based on a standard image containing preset measuring points, performing feature registration and inverse transformation matrix calculation on the real-time sampling image to obtain target pixel coordinates of the preset measuring points in the real-time sampling image; Inputting the target pixel coordinates into a global coordinate mapping function to perform space coordinate conversion so as to obtain target physical coordinates; And driving the triaxial gantry displacement mechanism according to the physical coordinates of the target to drive the optical detection probe to contact the workpiece to be detected, and triggering the optical detection probe to perform spectrum acquisition so as to obtain an optical measurement value.
7. The system for automated measurement of optical values of claim 6, wherein the master computing unit is further configured to: Performing feature scanning and nearest neighbor searching matching on the real-time sampling image and the standard image to obtain a feature point pair set; performing mismatching elimination and model fitting on the feature point pair set to obtain a homography matrix transformed from the real-time sampling image to the standard image; performing inverse operation on the homography matrix to obtain an inverse transformation matrix; and performing matrix mapping and normalization calculation on the preset measurement points by using the inverse transformation matrix to obtain target pixel coordinates.

Description

System for realizing automatic measurement of optical value Technical Field The present application relates to the field of industrial intelligent manufacturing, and more particularly to a system for implementing automated measurement of optical values. Background In the technical field of electronic paper manufacture and display, when color development requirements are involved, high requirements are generally placed on the accuracy of color display at different temperature ranges. The color development effect of the electronic paper is generally controlled by configuration parameters for each color, and when the color development effect is found to be different from a standard value, the correction of the color development effect can be performed by adjusting the parameters. Therefore, in order to ensure the final display quality of the product, accurate optical value measurement and verification of the color development effect of the workpiece under a specific temperature environment are required. However, existing test schemes have significant limitations in achieving the above objectives. Current common practice includes either adjusting the entire room to a target temperature for measurement or using an incubator to hold the workpiece at a constant temperature and then taking out for rapid measurement. The temperature control device has the advantages that if a plurality of temperature sections are required to be verified, the field maintenance cost is extremely high, the internal temperature environment cannot be maintained when the temperature box is opened, temperature drift is generated due to the temperature difference of the environment after a workpiece is taken out, errors are generated in measurement, and meanwhile, the workpiece is required to be put into the temperature box again after the test is finished to wait for long temperature recovery, so that the debugging efficiency is seriously affected. Although some schemes try to directly place measurement equipment in an incubator, the contradiction between precision and positioning is faced, namely the common software simulation prediction is indistinct from a true value, while an area array camera is wide in visual field coverage, but the precision of the color measurement scheme is low, and cannot meet a severe standard, in contrast, a single-point measurement instrument is the highest in average color measurement precision in a small aperture and is most suitable for measuring a small-sized color block of a screen in an electronic paper production process, but cannot sense the position of the single-point measurement instrument, and is difficult to accurately position a specific area to be measured in a closed space. Therefore, how to keep a constant temperature environment in a closed environment simulation box body to avoid temperature errors caused by box opening and to use the high-precision advantage of a single-point measuring instrument and solve the problem that the single-point measuring instrument is difficult to accurately align with a micro measuring point of a workpiece to be measured in a blind measurement state is a technical problem to be solved. Accordingly, a system that enables automated measurement of optical values is desired. Disclosure of Invention The present application has been made to solve the above-mentioned technical problems. Embodiments of the present application provide a system for implementing automated measurement of optical values. According to one aspect of the application, a system for realizing automatic measurement of an optical value is provided, which comprises an environment simulation box body, a base support platform, a three-axis gantry displacement mechanism, an end execution support, an optical detection probe, a visual calibration reference piece, a global imaging camera, a main control calculation unit and a main control calculation unit, wherein the environment simulation box body is used for limiting an independent test space, the base support platform is horizontally fixedly arranged on the inner bottom surface of the environment simulation box body, the three-axis gantry displacement mechanism is erected and fixed on the base support platform, the end execution support is mechanically connected to a Z-axis driving end of the three-axis gantry displacement mechanism and can move in the space along with driving of X, Y, Z axes, the optical detection probe is detachably embedded in the end execution support, the visual calibration reference piece is flatly attached to the upper surface of the back of the optical detection probe, the global imaging camera is suspended on the top beam of the three-axis gantry displacement mechanism or the inner top wall of the environment simulation box body, the main control calculation unit is respectively used for establishing two-way data electrical connection with the three-axis gantry displacement mechanism, the optical detection probe and the globa