Development of narrow-band image imaging based on hyperspectral image conversion technology for capsule endoscopy

Human upper gastrointestinal lesions include esophageal cancer, Barrett's esophagus, gastroesophageal reflux, etc. Through the diagnosis of upper gastrointestinal endoscopy, it is possible to capture images of symptoms and study relevant lesion in real time. The traditional inspection uses a tubular endoscope with a diameter of about 1 cm. It is inserted from the mouth, passes through the throat, esophagus, and finally reaches the stomach. During the inspection, the symptoms of the upper gastrointestinal are checked step by step. Due to the caliber of the pipeline equipment, it often causes discomfort at the throat. A new type of capsule endoscope with wires was born accordingly. It is mainly used to assist in the examination of symptoms in the upper gastrointestinal(esophagus, stomach, and duodenum). The patient can only swallow the capsule endoscope orally, just like swallowing capsule medicine. Follow-up doctors can control the posture of the capsule endoscope through the magnetic control handle to do examinations and obtain required images. However, compared with traditional endoscopes, capsule endoscopes can not be equipped with additional narrow-band light sources, optical magnification and other functions on the endoscope due to the need for simplified volume, and the controllability of symptom observation is slightly insufficient. Based on this deficiency, this study deeply explores the narrow-band imaging technology that can be applied to capsule endoscopy. With the introduction of hyperspectral imaging technology, it reconstructs the capsule endoscopy image into spectral information, and combines the principle of color reproduction to optimize adjustment. Light source information, and finally reproduce the simulated narrowband image. Based on this narrow-band imaging technology, the narrow-band imaging function of the capsule endoscope can be endowed, which can help clinical examination to observe symptoms.