1. An apparatus for extracting pixel data corresponding to an artificial image from an input image signal, said pixel data including multiple items of color data, said apparatus comprising: motion-information-outputting unit for outputting information of a horizontal moving distance in a line where the artificial image is present on a screen obtained from the input image signal; motion compensation unit for performing motion compensation on signal components of frames, which are present in timing before and after a current frame of the input image signal, based on the information of the moving distance output from the motion-information-outputting unit; detecting unit for detecting whether each pixel of a screen obtained from a signal component of the current frame of the input image signal is a pixel that is present at an edge position of the artificial image, based on the signal component of the current fame of the input image signal and the signal components, which have been compensated in terms of motion by the motion compensation unit, of the frames which are present in timing before and after the current frame of the input image signal; edge pixel extractor for extracting pixel data corresponding to the pixel of the edge position of the artificial image among items of pixel data constituting the signal component of the current frame of the input image signal, based on a detection result of the detecting unit; histogram processor for creating a histogram using the items of pixel data extracted by the edge pixel extractor and for obtaining data values of multiple items of color data that constitutes the pixel data corresponding to the artificial image, based on the histogram; extraction region selector for selecting an extraction region flag, said extraction region flag entering one state in accordance with the line where said artificial image is preset in the screen obtained by said input image signal; and extractor for extracting pixel data, from items of pixel data that constitute a signal component of a current frame of said input image signal, of the line by which said extraction region flag selected by said extraction region selector enters said one state, said pixel data of the line being constituted of multiple items of color data, said multiple items of color data each matching a data value obtained by said histogram processor, as the pixel data corresponding to the artificial image.