Computer Vision-Based Pressure Gauge Measurement for Fire Extinguisher Inspection

In this paper, the measurement of pressure gauge using color segmentation is proposed for the safety management of fire extinguisher. The main idea is that pressure gauge includes a green color indicating the normal pressure. In order to measure the fire extinguisher pressure, the proposed algorithm consists of two steps. The first step is performed the image cropping to find the region of the pressure gauge using CHT algorithm and green detection. The next step is calculated to find the indicator needle of the pressure gauge using the color code pattern around the green area. Finally, the actual pressure value is calculated based on the angle of the green area and the indicating needle. Some experimental results are conducted so as to verify the proposed algorithm, and the proposed method calculated the actual pressure, effectively.