PROBLEM TO BE SOLVED: To reduce analysis errors in analyzing a contact patch of a tire.SOLUTION: A tire tread analysis device 20 comprises; a tread image acquisition unit 32 configured to acquire an image of a treat 61 of a test tire 60; and a groove extraction unit 33 configured to extract grooves 65 of the test tire 60 from a tread image 80 acquired by the tread image acquisition unit 32. The groove extraction unit 33 comprises; a scan line setting unit 34 configured to set a scan line 70 for the tread image 80; a brightness comparison unit 35 configured to compare brightness of a center pixel 74 of the scan line 70 and local brightness of a groove; and a determination unit 36 configured, when brightness of the center pixel 74 is lower than the local brightness of a groove, to scan the tread image 80 within a range defined as a predetermined length from the center pixel 74 on each side in a longitudinal direction of the scan line 70 to extract brightnesses, derive a maximum brightness position within the scanned range on each side of the center pixel, and determine a range between the two maximum brightness positions as the groove 65.SELECTED DRAWING: Figure 2
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