1. An image discrimination device comprising: an edge calculating section that calculates an edge direction in each processing unit including a predetermined number of pixels of an image; a local connectivity calculating section that calculates a local connectivity intensity indicating a degree of alignment with the edge direction of a surrounding processing unit in each of the processing units based on the calculated edge direction; and an image attribute discrimination section that discriminates among image attributes in each attribute discrimination region including a predetermined number of processing units of the image using the local connectivity intensity of the processing unit in the attribute discrimination region, wherein the local connectivity calculating section sets processing units on both sides perpendicularly adjacent to an edge direction of an object processing unit that are of a processing unit of an object whose local connectivity is calculated to the surrounding processing units, and the local connectivity calculating section calculates the degree of alignment of the edge direction of the object processing unit with the edge directions of the surrounding processing units as the local connectivity intensity of the object processing unit.