An image processing system which includes: imaging unit which images an imaging object having positioning symbols; image acquisition unit which detects the positioning symbols from original image data imaged by the imaging unit, recognizes a predetermined area calculated based on the positioning symbols as a first range, extracts only image data existing in the first range to acquire this image data as extracted image data, and corrects the extracted image data based on a distance between the positioning symbols; and image data storage unit which stores the extracted image data acquired by the image acquisition unit, the imaging object comprising: a rectangular paper main portion; and the positioning symbols which are formed in at least two kinds of shapes and disposed in at least two locations out of areas near four corners of the paper main portion, and are created as symbol codes constituted by multi-valued graphics, wherein each of the positioning symbols has an emerging foreground portion having a color value that is different from a ground color of the paper main portion and a non-emerging background portion having the ground color of the paper main portion, the first positioning symbol includes a frame-shaped emerging portion having two pairs of straight line portions respectively parallel with two sides a corner of the paper main portion, and the non-emerging background portion of the first positioning symbol is an area having the ground color which is surrounded by the frame-shaped emerging foreground portion, and the second positioning symbol at least includes an emerging foreground portion having two straight line portions respectively parallel with two sides of the paper main portion and a corner portion where edges of the two straight line portions contact each other, and a second rectangular emerging foreground portion which is located inside the angle formed by the two straight line portions and the corner portion, and the non-emerging background portion of the second positioning symbol is an area between said two foreground portions. a rectangular paper main portion; and the positioning symbols which are formed in at least two kinds of shapes and disposed in at least two locations out of areas near four corners of the paper main portion, and are created as symbol codes constituted by multi-valued graphics, wherein each of the positioning symbols has an emerging foreground portion having a color value that is different from a ground color of the paper main portion and a non-emerging background portion having the ground color of the paper main portion, the first positioning symbol includes a frame-shaped emerging portion having two pairs of straight line portions respectively parallel with two sides a corner of the paper main portion, and the non-emerging background portion of the first positioning symbol is an area having the ground color which is surrounded by the frame-shaped emerging foreground portion, and the second positioning symbol at least includes an emerging foreground portion having two straight line portions respectively parallel with two sides of the paper main portion and a corner portion where edges of the two straight line portions contact each other, and a second rectangular emerging foreground portion which is located inside the angle formed by the two straight line portions and the corner portion, and the non-emerging background portion of the second positioning symbol is an area between said two foreground portions.