Patent ID: 9235773
Filing Date: 2016-01-12
CPC Classification: G06K,H04N

Claim Text:
1. An image processing device comprising: a processor; and a memory storing computer-readable instructions therein, the computer-readable instructions, when executed by the processor, causing the image processing device to perform: acquiring the image data representing an image, the image data including a plurality of sets of pixel data each having a multiple-level gradation value, each gradation value falling within a predetermined range between and inclusive of a minimum gradation value and a maximum gradation value, a predetermined number of levels of gradation value falling within the predetermined range; setting a plurality of partial ranges of levels of gradation value, a respective number of levels of gradation value in each of the plurality of partial ranges being smaller than the predetermined number, and the plurality of partial ranges being different from one another; and determining that the image is a photograph image based at least in part on the image meeting a first criterion that a smallest degree of change among a plurality of degrees of change in distribution of gradation values of the plurality of partial ranges is smaller than a reference value, each of the plurality of degrees of change in the distribution of gradation values being determined based on a pixel number of sets of pixel data whose levels of gradation value fall within a respective one of the plurality of partial ranges.