Diaphragm gas meter reading identification method and device based on projection segmentation method

The invention discloses a diaphragm gas meter reading identification method and device based on a projection segmentation method, and the method comprises the following steps: obtaining an initial reading image of a gas meter, and judging whether a scanning line of a camera device is aligned with a horizontal center line of a last character wheel or not; the horizontal center line of the last character wheel is detected through a machine vision algorithm, and the camera device is adjusted; acquiring a last character wheel image by using the adjusted camera device; performing image preprocessing on the last character wheel image; counting the preprocessed last character wheel image by adopting a projection segmentation method; according to the method, a projection feature analysis method is adopted for detection, the number of characters rotated by the last word wheel of the counter during operation of the gas meter can be accurately counted, the specific characters do not need to be recognized, and the image