1. An image processing method, comprising: detecting, by a detection circuit, an input sequence of image frames captured using an image capturing device to generate a detection result indicating whether or not to perform frame interpolation on the input sequence of image frames, the detection circuit capable of generating the detection result based on an exposure time of the image capturing device; referring to the detection result to selectively perform the frame interpolation on the input sequence of image frames to generate a to-be-encoded sequence of image frames; and encoding the to-be-encoded sequence of image frames to generate an encoded video signal, wherein the detection result comprises a luminance of the input sequence of image frames, and wherein when the detection result indicates that the luminance is less than a predetermined threshold, the step of performing the frame interpolation on the input sequence of image frames to generate the to-be-encoded sequence of image frames is performed.