Patent ID: 9588332
Date: 2017-03-07
CPC Classifications: F01D,G02B,H04N

Claim:
1. A photography system comprising: an observation scope inserted into a hole of a case in which a plurality of subjects, which are cyclically disposed around a rotary shaft and rotate around the rotary shaft, are housed along with the rotary shaft and the hole is formed to penetrate through the case, the observation scope being configured to sequentially acquire light from the plurality of subjects; an imaging sensor configured to generate an image by continuously imaging light acquired by the observation scope; a sensor configured to continuously detect states of the plurality of subjects which rotate and sequentially output detection values; and a controller configured to: a plurality of sets of subject groups, each of which includes the plurality of subjects that are cyclically disposed around the rotary shaft and rotate around the rotary shaft, are housed along with the rotary shaft and the hole comprises a plurality of holes formed in the case to penetrate through the case, the observation scope comprises a plurality of observation scopes including first and second observation scopes which sequentially acquire light from the plurality of subjects included in the one set of subject groups among the plurality of sets of subject groups are inserted into the plurality of holes, the sensor comprises a plurality of sensors including a first sensor configured to detect the states of the plurality of subjects from which the first observation scope acquires light and a second sensor configured to detect the states of the plurality of subjects from which the second observation scope acquires light are provided, and the controller is further configured to: detect a first cycle which is a cycle of variation of the detection value output by the first sensor, detect a second cycle which is a cycle of variation of the detection value output by the second sensor, and calculate the number of subjects disposed around the rotary shaft based on a ratio between the first cycle and the second cycle.