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1. An instruction position detection device comprising: a processor that acquires a movement amount of an instruction position of an indicator capable of detecting the movement amount, and performs a control of projecting, from a projection apparatus, an image including a setting image for setting an origin of the instruction position of the indicator, wherein the processor is configured to: prompt an operator to instruct, by the indicator, a first position and a second position in a projected projection image, and acquire first information indicating a relationship between a size of the projection image and a size of the image based on a detection result of the movement amount from the first position being instructed to the second position being instructed; acquire an input result of a setting operation of the operator in a state where an instruction for a position indicated by the setting image in the projected projection image is provided by the indicator; and perform a control of detecting the instruction position of the indicator in the image based on the position of the setting image in the image, the movement amount after the input result of the setting operation is acquired, and the first information.
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