Patent attributes
Detection of inadequately trimmed images can be carried out promptly and accurately among a large amount of trimmed images obtained through automatic trimming. The trimmed images generated through the automatic trimming are reproduced three times at an image display rate of 30 images per second. Order of reproduction is changed randomly in each time of reproduction. When an operator carries out input for indicating finding of an inadequately trimmed image in each time of reproduction, 10 images arranged 6 to 15 images backward in a display sequence from the image being displayed at the time of input are marked as an image group including the inadequately trimmed image, in response to the input. Only the trimmed images marked in all the rounds of reproduction are extracted as candidates for the inadequately trimmed image.