An image processing apparatus, comprising: a memory storing first overlay image data of only a first color and second overlay image data of only a second color, wherein the first color and the second color are different colors, wherein the first and the second overlay image data (21a, 21b) are to be superimposed on captured image data (20a, 20b), and wherein the captured image data (20a, 20b) describes successive frames generated by capturing surroundings of a vehicle by an imaging unit, wherein the successive frames comprise odd frames and even frames; an image color determining unit configured to determine whether a frame is an odd frame or an even frame; and to read, from the memory, the first overlay image data upon input of captured image data of an odd frame and to read, from the memory, the second overlay image data upon input of captured image data of an even frame; and an image synthesizing unit configured to output, to a selector comprised in the image processing apparatus, a switching signal according to the determined order of the frame defining whether the frame is the even frame or the odd frame of the captured image data, wherein the selector is configured to select one of the first or second overlay image data (21a; 21b) read from the memory in response to the switching signal and to input the selected first overlay image data for the odd frame to the image synthesizing unit and to input the selected second overlay image data for the even frame to the image synthesizing unit, wherein the image synthesizing unit is further configured to superimpose the selected first or second overlay image data (21a, 21b) on predetermined positions in the captured image data (20a, 20b), and to output the data resulting from the superimposing to a display. a memory storing first overlay image data of only a first color and second overlay image data of only a second color, wherein the first color and the second color are different colors, wherein the first and the second overlay image data (21a, 21b) are to be superimposed on captured image data (20a, 20b), and wherein the captured image data (20a, 20b) describes successive frames generated by capturing surroundings of a vehicle by an imaging unit, wherein the successive frames comprise odd frames and even frames; wherein the first and the second overlay image data (21a, 21b) are to be superimposed on captured image data (20a, 20b), and wherein the captured image data (20a, 20b) describes successive frames generated by capturing surroundings of a vehicle by an imaging unit, wherein the successive frames comprise odd frames and even frames; an image color determining unit configured to determine whether a frame is an odd frame or an even frame; and to read, from the memory, the first overlay image data upon input of captured image data of an odd frame and to read, from the memory, the second overlay image data upon input of captured image data of an even frame; and to determine whether a frame is an odd frame or an even frame; and to read, from the memory, the first overlay image data upon input of captured image data of an odd frame and to read, from the memory, the second overlay image data upon input of captured image data of an even frame; and an image synthesizing unit configured to output, to a selector comprised in the image processing apparatus, a switching signal according to the determined order of the frame defining whether the frame is the even frame or the odd frame of the captured image data, the selector is configured to select one of the first or second overlay image data (21a; 21b) read from the memory in response to the switching signal and to input the selected first overlay image data for the odd frame to the image synthesizing unit and to input the selected second overlay image data for the even frame to the image synthesizing unit, wherein the image synthesizing unit is further configured to superimpose the selected first or second overlay image data (21a, 21b) on predetermined positions in the captured image data (20a, 20b), and to output the data resulting from the superimposing to a display.