Abstract:Space sampling effect of infrared focus plane array (IRFPA) can influence the infrared computer image generation (CIG). To improve the simulating fidelity, it is necessary to simulate the space sampling effect. After analyzing the principle of the space sampling effect, its mathematics model was built. The resolving transform was also discussed. The processing method based on the image pixel was adopted to add the space sampling effect on the infrared image. The simulation experiments indicate that the fidelity is improved when the space sampling effect was added.