1. An image sensing apparatus, comprising: a sensing module for capturing an image from an object, wherein the sensing module includes a plurality of pixels and a light source for detecting a defect in the pixel and wherein the light source is turned on or off for a test mode; control means for determining whether there are any defective pixels in an image frame received from the sensing module using the light source and for storing a position about a defective pixel; and image concealment means for comparing a position of the detected defective pixel with a position of the image frame of the object and for concealing the detected defective pixel.