IMAGE ENHANCEMENT DEVICE, IMAGE ENHANCEMENT METHOD

摘要

PROBLEM TO BE SOLVED: To sharpen an image by frequency components exceeding Nyquist frequency.SOLUTION: An image enhancement device 1 generating an output image by sharpening an input image comprises a filter 10 for generating a first signal by removing at least the DC component of the frequency components included in an input image signal representing the input image; a nonlinear processing unit 20 for generating a second signal by performing nonlinear processing of the first signal becoming asymmetrical for positive and negative of the first signal; a limiter 30 for generating a third signal by adjusting the second signal; and an adder 50 for generating an output image signal representing the output image by adding the third signal to the input image signal.