Image display device and capsule endoscope system

An image display device that displays an internal body image group based on internal body image data acquired from a capsule endoscope taking internal body images of a subject, the image display device comprising:

• a memory unit that stores the internal body image data and information associated with the internal body image data and related to a position of the capsule endoscope within the subject;
• a position information acquisition unit that performs a position estimation process based on the information related to a position to acquire position information of the capsule endoscope at imaging of each of the internal body images;
• a determination unit that determines whether results of predetermined image processing on the internal body image data meet a condition for performing a preferential process and provides a flag to the internal body image data meeting the condition;
• a preferential process control unit that controls the position information acquisition unit to perform the position estimation process on the internal body image data provided with the flag by the determination unit;
• a display image processing unit that performs display image processing on the internal body image data stored in the memory unit;
• a display unit that displays an image observation screen having an image display area in which a plurality of internal body images constituting the internal body image group is sequentially displayed based on the internal body image data subjected to the display image processing and a position information display area in which position information acquired by the position information acquisition unit is displayed;
• and
• a display control unit that causes the display unit to display the image observation screen after completion of the position estimation process performed under control of the preferential process control unit, wherein,
• after performing the position estimation process on the internal body image data provided with the flag, the position information acquisition unit performs the position estimation process on remaining internal body image data other than the internal body image data provided with the flag,
• the position information display area has a plurality of divided areas divided in a matrix, and the divided areas corresponding to the position information are displayed in a predetermined color or pattern, and
• after completion of the position estimation process performed under control of the preferential process control unit, the display control unit sub-divides the divided areas according to progress of the position estimation process on the remaining internal body image data, and causes the display unit to display the sub-divided areas.