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 34 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 34 comprises; a scan line setting unit 35 configured to set a scan line for the tread image 80; a brightness comparison unit 36 configured to compare brightness of a center pixel 74 of a scan line 70 and local brightness of a groove; and a determination unit 37 configured to, when brightness of the center pixel 74 is lower than the local brightness of a groove, generate a differential brightness profile 95, extract local maximum points 96 having differential brightness values equal to or higher than a predetermined threshold from the differential brightness profile 95, and determine a region between two local maximum points 96, chosen from amongst the local maximum points 96, closest to the center pixel 74 on both sides of the center pixel 74 in a longitudinal direction of the scan line 70 to be the groove 65.SELECTED DRAWING: Figure 2
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