一种基于图像处理技术的镜框尺寸测量系统

doi:10.16180/j.cnki.issn1007-7820.2022.11.007

Abstract

Abstract:

In response to the inapplicability of traditional frame size measurement methods under special circumstances, this study proposes an image-based non-contact measurement method which uses image processing technology to extract and measure the outline of the frame. ERT is used to locate the face and locate the face frame area according to the feature points. In the process of preprocessing and contour detection, an improved Canny algorithm is used to obtain a more complete frame contour. The frame recognition mode is calibrated by the minimum bounding rectangle method, which improves the extraction accuracy of the frame, and facilitates the subsequent size measurement of the frame outline. The actual size information of the outline of the lens frame is obtained with the interpupillary distance as the reference object. The results of the algorithm implementation on the PC side show that the proposed measurement algorithm has low complexity, high accuracy, and fast measurement speed, and can quickly and accurately measure the outline size of the frame on a mobile device.

Key words: image processing, frame size, contour detection, ERT, adaptive, PD, non contact, pretreatment

CLC Number:

TP391

ZHANG Zhihao,FU Dongxiang,YAN Rui. A Measuring System for Frame Size Based on Image Processing Technology[J].Electronic Science and Technology, 2022, 35(11): 42-47.

Figures/Tables 12

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References 18

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误差范围 /mm	合格张数	不合格张数	合格率 /%
±0.5	217	83	72.3
±1.0	256	44	85.3
±1.5	278	22	92.7
±2.0	291	9	97.0

误差范围 /mm	合格张数	不合格张数	合格率 /%
±0.5	153	147	51.0
±1.0	188	112	62.7
±1.5	238	62	79.3
±2.0	263	37	87.7

目标	对比	DBL /mm	HBOX /mm	VBOX /mm	SEGHT /mm	ED /mm
1	测量值	26.8	53.0	43.6	11.4	57.7
1	实际值	27.9	55.1	45.7	13.4	57.8
2	测量值	26.5	73.9	64.4	14.2	66.4
2	实际值	26.6	71.7	65.5	15.1	67.7
3	测量值	12.1	41.0	62.6	13.4	62.2
3	实际值	13.3	41.7	63.7	14.5	62.7
4	测量值	20.1	34.2	61.5	9.9	60.0
4	实际值	19.2	34.7	62.1	10.1	59.4

A Measuring System for Frame Size Based on Image Processing Technology

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