1. A method of displaying images of human gastrointestinal (GI) tract captured using a capsule device including a plurality of cameras, wherein the plurality of cameras are configured fixedly within a capsule housing and any two neighboring cameras of the plurality of cameras have an overlapped field of view (FOV), the method comprising: receiving a plurality of image sequences captured by the plurality of cameras respectively, wherein the plurality of image sequences comprise multiple sets of intra images and an i-th set of intra images corresponds to concurrent images captured by the plurality of camera at time index i; generating a composite image by stitching the multiple sets of intra images; and displaying the composite image on a display device.