Images may be thermal images.

The images are infrared images (100).

The close-range images are composited into the virtual images, and the post-compositing virtual images are further composited into the inputted images and displayed.

The tomographic images obtained can be displayed along with the fluoroscopic images.

Part-images which show the respective objects are determined in the X-ray images and the part-images are arranged in the display images.

A user device finds the reference frames, counts the reference frames, confirms the relation of the frames desired to be displayed, and displays the desired frames.

The input images comprise projection images.

Continuous-tone 'real scene' images such as digitized still pictures and video frames are of primary interest.

The images are then compared, voxel-by-voxel, to detect differences between pre-biopsy and post-biopsy images.

The video cameras capture images and identify bright areas in the captured images.

The images in the plurality of images may be downsampled.

The dummy pictures can be dummy predictive pictures.

Multiple images may be used in some embodiments, including images of different types such as visible spectrum images, infrared spectrum images, and/or ultraviolet spectrum images.

The display device alternately displays the left-eye images and the right-eye images, providing images perceived as three-dimensional.

The reference images (14, 16, 18, 20, 22) and portal images or volumetric images or both portal and volumetric images (24, 26, 27, 28, 30) are compared and the radiation therapy plan modified based on the comparison.