CPC G06T 7/0004 (2013.01) [G06K 15/027 (2013.01); G06T 2207/10024 (2013.01); G06T 2207/30144 (2013.01)] | 6 Claims |
1. An image processing method performed by a processor for determining an image defect in a test image obtained through an image reading process performed on an output sheet output by an image forming apparatus, the image processing method comprising:
deriving, by the processor, a vertical data string that is composed of data about horizontal representative values serving as representative values of a plurality of pixel values in each line in a horizontal direction in the test image;
determining, by the processor, presence or absence of at least one periodicity set in advance in the vertical data string by performing frequency analysis on the vertical data string; and
determining, by the processor, occurrence or non-occurrence and cause of periodic density unevenness serving as a type of the image defect according to a determination result on the periodicity.
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