An image processor (24) includes an image processing section (04) which performs a blurring process on a given image data. The image processing section (04) is provided with an image data reduction part (04A), a spatial filter processing part (04B), and an image data expansion part (04C). The image data reduction part (04A) reduces the given image data at a predetermined reduction rate to generate a reduced image data. The spatial filter processing part (04B) performs a spatial filter process on the reduced image data reduced by the image data reduction part (04A) to generate a processed image data. An image data expansion part (04C) expands the processed image data processed by the spatial filter processing part (04B) at an expansion rate inverse of the reduction rate.