1. A hybrid image processing method of an image capturing device having a first lens and a second lens comprising: capturing a scene by using the first lens and the second lens so as to respectively generate a mono image and a color image of the scene; and selecting one of a mono image-based mode, a color image-based mode, and a color image-only mode dynamically according to a content of the scene so as to generate an output image, wherein the mono image-based mode is to produce the output image by adding color image data of the color image onto the mono image, the color image-based mode is to produce the output image by adding mono image data of the mono image onto the color image, and the color image-only mode is to produce the output image by only using the color image.