Image processing method and display device using the same

A display device, comprising:

• an image processing device, comprising:
• an image pre-processing circuit, configured to perform a conversion of a first color space on an original image to generate a reference image corresponding to the first color space;
• an edge filter, electrically connected to the image pre-processing circuit and configured to detect an image region with a high-frequency signal in the reference image to generate a detection result;
• a first fusing circuit, electrically connected to the edge filter and configured to perform an operation on the detection result with a preset gain value to generate a first computation result;
• a gain selection circuit, electrically connected to the edge filter and configured to evaluate the detection result and the first computation result to select a reference gain value;
• a second fusing circuit, electrically connected to the gain selection circuit and configured to perform an operation on the detection result according to the reference gain value to generate a second computation result;
• a multiplexer, electrically connected to the first fusing circuit and the second fusing circuit and configured to select at least one of brightness values of a first pixel of a first fused image and a second pixel of a second fused image according to the first computation result and the second computation result to generate a brightness value of a pixel of a third fused image;
• and
• an image post-processing circuit, electrically connected to the multiplexer and configured to perform a conversion of a second color space on the third fused image to generate an output image corresponding to the second color space;
• and
• an imaging device, electrically connected to the image processing device and configured to receive the output image and display the output image.