DETECTION DEVICE, DETECTION PROGRAM, AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To detect the moving speed of a moving member with high accuracy.SOLUTION: A light source 51 of a detection device 10 irradiates a moving member 53 with a laser beam. An acquisition unit 57A acquires a photographed image of an irradiation place of the laser beam on the moving member 53. A conversion unit 57B subjects a first image acquired in a first time and a second image acquired in a second time to the Fourier transformation. A generation unit 57C generates a correlation intensity image indicating correlation intensity of phase information between the first image subjected to the Fourier transformation and the second image subjected to the Fourier transformation. A searching unit 57D searches in a search area in the correlation intensity image on the downstream side in a direction of movement of the moving member 53 from the image center of the correlation intensity image to search a peak position in the correlation intensity image. A calculation unit 57E calculates a division value obtained by dividing the deviation amount between the image center and the peak position of the correlation intensity image by a difference between the first time and the second time, as the moving speed of the moving member 53.