An image processing apparatus that performs resolution conversion on image data to output to a display unit, comprising: a resolution converting unit configured to perform resolution conversion on the image data to generate pixel data having a resolution α times as high as a resolution of the display unit, where α>1; an image processing unit configured to perform an image processing on the pixel data; and a decimation unit configured to decimate the pixel data on which the image processing has been performed, to have a resolution equal to or lower than the resolution of the display unit, and to output decimated data to the display unit wherein the decimation unit is configured to output, to the display unit, pixel data of MxN pixels formed in a delta array, the pixel data having N lines of pixel lines each of which includes M pieces of pixels arranged in a horizontal direction at a pitch Ph, the pixel lines arranged in a vertical direction at a pitch Pv, the delta array in which two pixel lines adjacent to each other are shifted by approximately 0.5 Ph in the horizontal direction characterised in that the resolution converting unit is configured to generate the pixel data of 2MxN pixels by combining a first sub-output image of MxN pixels having N lines of pixel lines each of which includes M pieces of pixels arranged in a horizontal direction at a pitch Ph, the pixel lines arranged in a vertical direction at a pitch Pv, the first sub-output image in which two pixel lines adjacent to each other are shifted by approximately 0.5 Ph in the horizontal direction, and a second sub-output image of MxO.5N pixels having 0.5N lines of pixel lines each of which includes M pieces of pixels arranged in a horizontal direction at a pitch Ph, the pixel lines arranged in a vertical direction at a pitch Pvx2, the image processing unit is configured to perform the image processing on the pixel data of the 2MxN pixels, and the decimation unit is configured to decimate the pixel data of the 2MxN pixels to the pixel data of MxN pixels. a resolution converting unit configured to perform resolution conversion on the image data to generate pixel data having a resolution α times as high as a resolution of the display unit, where α>1; an image processing unit configured to perform an image processing on the pixel data; and a decimation unit configured to decimate the pixel data on which the image processing has been performed, to have a resolution equal to or lower than the resolution of the display unit, and to output decimated data to the display unit wherein the decimation unit is configured to output, to the display unit, pixel data of MxN pixels formed in a delta array, the pixel data having N lines of pixel lines each of which includes M pieces of pixels arranged in a horizontal direction at a pitch Ph, the pixel lines arranged in a vertical direction at a pitch Pv, the delta array in which two pixel lines adjacent to each other are shifted by approximately 0.5 Ph in the horizontal direction characterised in that the resolution converting unit is configured to generate the pixel data of 2MxN pixels by combining a first sub-output image of MxN pixels having N lines of pixel lines each of which includes M pieces of pixels arranged in a horizontal direction at a pitch Ph, the pixel lines arranged in a vertical direction at a pitch Pv, the first sub-output image in which two pixel lines adjacent to each other are shifted by approximately 0.5 Ph in the horizontal direction, and a second sub-output image of MxO.5N pixels having 0.5N lines of pixel lines each of which includes M pieces of pixels arranged in a horizontal direction at a pitch Ph, the pixel lines arranged in a vertical direction at a pitch Pvx2, the image processing unit is configured to perform the image processing on the pixel data of the 2MxN pixels, and the decimation unit is configured to decimate the pixel data of the 2MxN pixels to the pixel data of MxN pixels.