The image quality improvement device includes a low-pass filter that extracts a low-frequency component from an input video signal, a subtracting unit that subtracts the low-frequency component extracted by the low-pass filter from the input video signal, and obtains a high-frequency component. The control unit includes an adding unit that performs image quality correction on the input video signal by adding the high frequency component acquired by the unit to the input video signal. The low-pass filter is a cyclic filter that executes a weighted addition process that weights and adds an input video signal and a delayed signal that gives a delay of a predetermined time to its output, and outputs the result of the weighted addition process as a low-frequency component. including. When the input video signal represents a plurality of images, the control unit performs a weighted addition process for each of the plurality of images using a cyclic filter.
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