1. An image detection method for detecting a target image from an image of an object having a band-like pattern extending along a predetermined direction, said target image containing at least part of said band-like pattern, said method comprising: storing at least part of said image of said object as image data; detecting a first partial image from said stored image data based on a first template containing a first band-like template pattern that extends along said predetermined direction, said first partial image being an image of a first partial region containing substantially the same pattern as said first band-like template pattern; and detecting a second partial image, as said target image, in a region that extends from said first partial region along said predetermined direction based on said target image containing said at least part of said band-like pattern of said object, said second partial image being an image of a second partial region containing substantially the same pattern as that contained in said target image.