The study proposes narrow-band imaging (NBI) lens design of 415nm and 540nm of a capsule endoscope (CE). The researches\nshow that in terms of the rate of accuracy in detecting and screening neoplastic and nonneoplastic intestinal lesions, the NBI\nsystem outperformed that of traditional endoscopes and rivaled that of chromoendoscopes. In the proposed NBI CE optical\nsystem, the simulation result shows the field of view (FOV) was 109.8�°; the modulation transfer function (MTF) could achieve\n12.5% at 285 lp/mm and 34.1% at 144 lp/mm. The relative illumination reaches more than 60%, and the system total length was\nless than 4 mm. Finally, this design provides high-quality images for a 300-megapixel 1/4â�³ CMOS image sensor with a pixel size\nof 1.75 �¼m.
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