An image sensing system includes a camera module and an application processor. The camera module includes: an image sensor including a pixel array, the pixel array including color filters having a first pattern, the image sensor being configured to sense light incident on the pixel array to generate a first pattern image signal having the first pattern; a first converter configured to convert the first pattern image signal into a second pattern image signal having a second pattern different from the first pattern; and a second converter configured to convert the second pattern image signal into a third pattern image signal having a third pattern different from the first pattern and the second pattern. The application processor is configured to perform image processing on the third pattern image signal.