Patent ID: 8508667
Filing Date: 2013-08-13
Classification: G06T,H04N

Abstract:
1. An image enhancing device for sharpening an image represented by an input signal, comprising: a filter section for generating a first signal by removing, from an input signal which represents an image, at least a DC component of frequency components contained in the input signal; a nonlinear processor for generating a second signal by performing a nonlinear process to the first signal; and an adder section for adding the second signal to the input signal; wherein the nonlinear processor generates a third signal based on the first signal, the third signal making monotonic increase in a broad sense, nonlinearly or in positive-negative symmetry with respect to the first signal at least in the neighborhood of zero, and generates the second signal based on the third signal so that positive and negative signs in the first signal are substantially preserved in the second signal while the second signal does not contain a DC component.