关键词: 电磁泄漏, 重建图像, 字符识别, 阈值投影法, 模板匹配

Abstract: The information leakage caused by electromagnetic emanation of information equipment is a great hidden danger in information security. With information equipment widely used, the technology of information reconstruction from electromagnetic emanation of information equipment has been paid widespread attention. However, the Automatic recognition technology of reconstructing text in the information equipment has not aroused peoples attention. Artificial recognition method of reconstructing the text is timeconsuming, and images are not facilitate to save and realize automatic retrieval. So it is unable to find useful information quickly. This paper proposes an automatic character recognition method based on template matching to fit the "horizontal" lack property of reconstructed image from electromagnetic emanation of computer video. Experiments show that this method is suitable for the characteristics of the electromagnetic leakage text information, which can automatically and quickly identify the text information of the electromagnetic leakage reduction image.

Key words: electromagnetic emanation, reconstructed image, character recognition, threshold projection, template matching