To provide a computer program, image processing device and image processing method which can suppress the Moire.SOLUTION: A computer program causes a computer to execute: processing of acquiring image data of a plurality of x-y plane images captured at a prescribed interval along a z direction； processing of smoothing the plurality of x-y plane images on the basis of any target pixel of each of the plurality of x-y plane images and the pixel value of a neighboring pixel of the target pixel； processing of generating a three-dimensional voxel image constituted by a voxel corresponding to each pixel of each of the plurality of smoothed x-y plane images with the determined RGB value and opacity； processing of generating a post-conversion voxel image by performing prescribed coordinate conversion to the three-dimensional voxel image； and processing of performing rendering by setting the RGB value calculated based on the value obtained by cumulating and adding the cumulative luminance value with the product of the RGB value of the voxel, the opacity and the transmission intensity of the virtual beam for each voxel on the sight line as the pixel value of the pixel where the sight line crosses the projection surface when emitting the virtual beam from the prescribed view point toward the post-conversion voxel image.SELECTED DRAWING: Figure 13【課題】モアレを抑制することができるコンピュータプログラム、画像処理装置、画像処理方法を提供する。【解決手段】ｚ方向に沿って所定間隔で撮像された複数のｘｙ平面画像の画像データを取得する処理と、複数のｘｙ平面画像それぞれの任意の注目画素及び当該注目画素の近傍画素の画素値に基づいて、複数のｘｙ平面画像を平滑化し、ＲＧＢ値及び不透明度が定められ、平滑化した複数のｘｙ平面画像それぞれの各画素に対応するボクセルで構成される３次元ボクセル画像を生成し、前記３次元ボクセル画像に対して所定の座標変換を行って変換後ボクセル画像を生成し、所定の視点から仮想光線を変換後ボクセル画像に向かって照射したときに、視線上のボクセル毎に該ボクセルのＲＧＢ値及び不透明度並びに仮想光線の透過強度の積により累積輝度値を累積加算した値に基づいて算出されるＲＧＢ値を、視線が投影面と交差する画素の画素値をレンダリングする。【選択図】図１３
