Method and device for detecting resolution ratio of printed matter

A detection method and resolution technology, applied in the optical field, can solve problems such as low resolution detection efficiency

Pending Publication Date: 2021-09-24
O FILM IMAGE TECH (GUANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to address the problem of low resolution detection efficiency and provide a printed matter resolution detection method and device that can improve resolution detection efficiency

Method used

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  • Method and device for detecting resolution ratio of printed matter
  • Method and device for detecting resolution ratio of printed matter
  • Method and device for detecting resolution ratio of printed matter

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Embodiment Construction

[0036] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0037] In one embodiment, such as figure 1 As shown, a method for detecting the resolution of printed matter is provided, and the method includes steps:

[0038] S300. Acquire a sample image of the sample to be tested, and convert the sample image into a grayscale image. Wherein, the grayscale image includes boundary features of the sample to be detected. Specifically, the sample to be tested is a printed matter, for example, the printed matter may be a resolution test chart. The sample image can be taken by a sampling camera, and then the sampling camera sends the capt...

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Abstract

The invention relates to a method and device for detecting resolution ratio of printed matter. The method comprises the steps: acquiring a sample image of a to-be-detected sample, and converting the sample image into a gray level image, wherein the gray level image comprises boundary features of the to-be-detected sample; extracting a boundary inclination angle of the boundary feature from the grayscale image; obtaining the number of pixel points between a first gray threshold region and a second gray threshold region in the boundary feature; and obtaining the resolution of the to-be-detected sample according to the boundary inclination angle, the number of the pixel points and preset parameters. According to the method, the boundary inclination angle of the boundary feature of the to-be-detected sample and the number of the pixel points between the first gray threshold region and the second gray threshold region in the boundary feature are obtained, and the preset parameter is combined to finally obtain the resolution of the to-be-detected sample, so that the resolution detection does not need to be carried out by naked eyes, and the detection efficiency is improved.

Description

technical field [0001] The present application relates to the field of optical technology, in particular to a method and device for detecting resolution of printed matter. Background technique [0002] Printed matter is almost everywhere in life. When printing forms or paper, different printing resolutions can be selected according to needs. The resolution requirements for general printed matter are not very high in daily life. However, in some fields that have precision requirements for the resolution of printed matter, such as when testing optical modules, the accuracy requirements for the printing resolution of the test chart are relatively high, and it is necessary to test the printing resolution of the test chart to avoid The printing resolution of the test chart affects the accuracy of the optical module test results. [0003] However, traditional resolution detection generally adopts the method of artificial naked eye recognition and detection. Even experienced inspe...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/13G01N21/84
CPCG06T7/0004G06T7/13G01N21/84G06T2207/30144
Inventor 刘辉胡伟鹏
Owner O FILM IMAGE TECH (GUANGZHOU) CO LTD
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