An image processing system according to an embodiment includes a stereoscopic display device, a transform unit, an image generating unit, and a display control unit. The transform unit reduces or enlarges volume data which is three-dimensional (3D) image data such that among scales of a stereoscopic image assumed to be displayed on the stereoscopic display device using a parallax image group obtained from the volume data, a scale in a depth direction on a display surface of the stereoscopic display device is substantially the same as a scale in another direction which is a direction other than the depth direction. The image generating unit generates a parallax image group by performing a rendering process on transformed volume data. The display control unit causes the parallax image group to be displayed on the stereoscopic display device.
