IMAGE PROCESSOR

PROBLEM TO BE SOLVED: To provide an image processor capable of excellently displaying a part even when the part desired to see in a three-dimensional image display is obstructed and hidden by another structure, and not restricted in view point position for allowing reading of an image. SOLUTION: A volume model obtained by being divided into voxels is formed, and a volume rendering image is displayed by being projected from the prescribed view point position. An operation means designates and operates a designating point to a specific area on the displayed volume rendering image. An arithmetic operation means correlates a weight factor of becoming large in weight of at least the designating point, and becoming small in weight of respective voxel values of a voxel space to the respective voxel values of the voxel space existing on the view point position side more than the designating point, and executes arithmetic processing for changing transparency of the respective voxels. An image processing means projects image information by a correction voxel value arithmetically operated by the arithmetic operation means on respective pixels of a plane of projection, and displays and processes the volume rendering image for changing the transparency on a display image screen.