Image-processing device and control method thereof

An image-processing device, comprising:

• a detection unit configured to detect a motion region in which there is motion between an N-th frame image and an (N+1)-th frame image of an input image;
• a generation unit configured to generate an intermediate image from the N-th frame image and the (N+1)-th frame image, on the basis of a detection result by the detection unit;
• a processing unit configured to perform on the intermediate image processing of reducing a high-frequency component of spatial frequency;
• and
• an output unit configured to output an image resulting from increasing a frame rate of the input image through insertion of the intermediate image having undergone the image processing, between a display image based on the N-th frame image and a display image based on the (N+1)-th frame image,
• wherein when a target position at which a pixel value of the intermediate image is to be calculated is located within the motion region, the generation unit calculates a pixel value of the intermediate image at the target position on the basis of an average value of the pixel value of the N-th frame image and the pixel value of the (N+1)-th frame image at a position that is within a predefined range centered on the target position and outside the motion region.