Dual sensor imaging system and depth map calculation method thereof

A dual sensor imaging system and a depth map calculation method thereof are provided. The dual sensor imaging system includes at least one color sensor, at least one infrared ray (IR) sensor, a storage device and a processor. The processor is configured to load and execute a computer program stored in the storage device to control the color sensor and the IR sensor to respectively capture multiple color images and multiple IR images using multiple exposure conditions under an imaging scene, adaptively select a combination of the color image and the IR image that are comparable to each other from the captured color images and IR images, and calculate a depth map of the imaging scene by using the selected color image and IR image.