PH value detection method and device based on image processing

Abstract

The invention relates to a pH value detection method and a pH value detection device based on image processing, wherein a pulse signal sent by a single-chip is sent to a stepper motor, a connection rod is driven to rotate by the stepper motor, fluid to be detected is injected to pH test paper through an injection orifice of the fluid to be detected when an external end of the pH test paper falls to the center of the injection orifice of the fluid to be detected, and the pH test paper is shot by a CCD (charge coupled device) sensor under the light condition of an illuminating lamp when the pH test paper continuously falls to the center of a through groove in an image acquisition device box, so that the image acquisition of the color change signals is finished; and the acquired images are input into the single-chip for preprocessing and then are converted into an HIS color space, three characteristic value data of the color change blocks including H, I and S in the space are extracted, three characteristic values are input into a relation model both of a pre-built color block and the pH value, and the pH value is calculated, so that the online automatic detection of the pH value is realized and the influence of the human factors in the artificial reading process is avoided.

Description

technical field [0001] The invention relates to a method and device for detecting pH value based on image processing technology, which are mainly used in modern industrial production processes that require pH value detection. Background technique [0002] PH value detection is commonly used in the quality control of the production process, environmental protection and other occasions in industry. There are generally two types of sensors for measuring PH value in industry: antimony electrode and glass electrode. Antimony electrode is a metal electrode. Due to the accumulation of oxides on its surface, long-term use will affect the accuracy and repeatability. It must be cleaned regularly, and antimony itself is poisonous. , cannot be used in food, brewing, pharmaceutical and other production processes, and the applicable occasions are limited. The glass electrode was originally used for laboratory pH measurement, and was later discovered and applied to industrial occasions. It...

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Problems solved by technology

[0006] In view of the above-mentioned problems existing in the pH value measurement process in the current industrial production process, the present invention proposes a method and device for pH value detection based on image processing technology and no-

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