High Color Restored White Light Imaging (HLI)
Based on white light imaging, the ratio of blue-violet light and blue light was adjusted to obtain a white light image with more superficial and mid-level vascular information. The high-color restoration white light image highlights the vessels and mucosa more prominently, providing more details and information than regular white light imaging.

Superficial Vascular Emphasis Imaging（SVI） 
Based on white light imaging, blue-violet light is added to enhance the intensity of short wavelength narrowband light, which can highlight the contrast of vessels and structures in the mucosal surface. Clinically, it is mainly used for close-up observation and magnification examination, which helps in early detection of cancer.

Tissue Color Differentiation Emphasizes Imaging（TCI）
By using narrow-band spectral illumination of green, blue, and blue-violet light, it can enhance subtle color differences in mucosa, capturing tiny variations in mucosal tone, and significantly improve the detection rate of reddening and fading lesions.

Deep Vessel Emphasis and Hemorrhage Source Imaging（DHI）
Green and red light are used to identify the image areas of deep blood vessels and high concentration blood, enhancing the contrast between deep blood vessels and high concentration blood and the surrounding mucosa, achieving the goal of highlighting deep blood vessels and bleeding points.