Endoscopic virtual ruler based on artificial intelligence technology

Endoscopic virtual ruler based on artificial intelligence technologyMeasurement and evaluation of lesion size has always been one of the difficult problems to solve in endoscopy [1].Recently, we developed a real-time endoscopic virtual ruler measurement technology based on artificial intelligence (AI) technology.Geometric optics showed that the distance of the object was the only variable affecting the ratio of the size of the object to the size of the image when the focal length was fixed and the lesion was centered (the transverse distance from the main optical axis was zero) [2].Therefore, to obtain the actual size of the lesion, it is only necessary to measure the distance from the end of the lens to the lesion (object distance) and calculate the ratio of the size of the object to that of the image ( Fig. 1).This detection method E-Videos Fig. 2 Schematic diagram of the operation process of the endoscopic virtual ruler. Fig. 1 Schematic diagram of the endoscopic virtual ruler.The radius of the endoscope is R, the height of the transparent cap above the endoscopy is H 1 , the diameter of the measured object is L, and the increased distance between the tip of the endoscope and the measured object is H 2 (this distance can be obtained from the scale on the endoscope), L = R + H 1 (H-H 1 )/R.