Calibration block, profilometer calibration method and apparatus, device, and storage medium

By using calibration parts of different shapes to acquire images in different poses, combined with the target camera imaging model, low-cost and simple calibration of the profilometer was achieved, solving the problem of dependence on high-precision equipment in the existing technology and improving calibration efficiency and accuracy.

WO2026139029A1PCT designated stage Publication Date: 2026-07-02HANGZHOU HIKROBOT TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HANGZHOU HIKROBOT TECH CO LTD
Filing Date
2025-12-26
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing profilometer calibration methods require high-precision lifting or translation stages, resulting in high calibration costs and complex processes, making it difficult to achieve low-cost and simple calibration.

Method used

A calibration block is used, in which multiple calibration parts of different shapes are arranged along the same direction. By acquiring images in different poses, the initial calibration coordinates are determined using the contour information in the images and the positions of the calibration parts. The initial calibration coordinates are then converted from pixel coordinates to camera coordinates by the target camera imaging model.

Benefits of technology

Profilometer calibration can be completed without the need for a high-precision lifting or translation stage, reducing calibration costs, simplifying the calibration process, and improving calibration efficiency and accuracy.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN2025145970_02072026_PF_FP_ABST
    Figure CN2025145970_02072026_PF_FP_ABST
Patent Text Reader

Abstract

Embodiments of the present application relate to the technical field of machine vision, and provide a calibration block, a profilometer calibration method and apparatus, a device, and a storage medium. The method comprises: when a calibration block is respectively in a plurality of placement poses, respectively acquiring, by means of an image acquisition device, a plurality of images of the calibration block irradiated by light emitted by a profilometer; on the basis of the position of a first calibration portion on the calibration block and pixel coordinates of calibration block contour points of each of the plurality of images, determining initial calibration coordinates, corresponding to a plurality of calibration block contour points, in a calibration block coordinate system where the calibration block is located; on the basis of pixel coordinates corresponding to the plurality of calibration block contour points and the initial calibration coordinates, solving for parameters in an initial camera imaging model to obtain a target camera imaging model used for converting the initial calibration coordinates into pixel coordinates; and determining a target conversion relationship on the basis of the target camera imaging model, the target conversion relationship being a conversion relationship from the pixel coordinates to coordinates in a camera coordinate system.
Need to check novelty before this filing date? Find Prior Art