[issue] without performing the task of selecting an area of the iron lid from the image, it provides an assessment system of partially worn iron lid. A pattern height evaluation system 1 of the manhole iron lid, from the input image, and the iron lid area detection function unit 10 to extract the iron lid area that represents the manhole iron lid, iron lid area detection function unit 10 based on the actual size of the detected iron lid region and manhole iron lid by a pixel resolution calculation function unit 20 for calculating a pixel resolution representing the actual length corresponding to one pixel of the input image, pixel resolution calculation using pixel resolution calculated by the function unit 20, of the manhole iron cover, a measuring unit 30 for measuring the pattern height of the plurality of portions is designated, the measurement area dividing function unit that divides an iron lid region in the input image It includes a 40, for each of the divided areas divided by the measurement area dividing function unit 40, in the partition area measured by the measuring unit 30, a display unit 50 for displaying the pattern height of the corresponding portion.FIELD 1
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