IMAGE PROCESSING DEVICE

摘要

An image signal inputted from an image signal input unit (10) is passed through LPFs (14 and 16) having different frequency response characteristics to remove a color signal component. A feature value calculator (20) calculates an edge value, saturation, and hue from pixels surrounding a target pixel, and a weighting coefficient calculator (22) determines a weighting coefficient k from the feature values calculated by the feature value calculator (20) and from the amounts of changes therein. According to weighting coefficient k calculated by the weighting coefficient calculator (22), a weighted adder (24) performs weighted addition in such a way that it uses a greater amount of a signal of the LPF (14), which passes high-frequency components, for an achromatic color area or even for a chromatic color area if the area has little saturation and change in hue; and that it uses a greater amount of a signal of the LPF (16), which causes little aliasing, for a chromatic color area with some saturation and change in hue. A horizontal contour correction unit (26) receives an output signal of the weighted adder (24) and generates a horizontal contour correction signal. Consequently, a high-quality image having high resolution and little aliasing can be obtained with the scale of the circuit being limited.