Steganography plays a vital role in the security of multimedia communication. For digital image steganography based on DCT domain,the steganographic effects of secret information in mother and Lena image are simulated,the impact on image quality is studied with different embedded positions of the secret information in the DCT domain of an image, as well as with different carrier images. Studies show that: embedding the information in the low frequency part of the image and selecting the image with rich distribution pixel value can help improve the steganography effects of the information in the image and enhance the concealment of the secret information.%在多媒体通信的安全问题上，隐写术起着至关重要的作用。针对隐写术中常用的 DCT 域数字图像隐写方法，对秘密信息在mother和Lena图像中的隐写效果进行了仿真，研究了秘密信息在图像DCT域中的不同嵌入位置、不同的载体图像进行隐写时，对图像质量所产生的影响。研究表明：将信息嵌入图像的低频部分、选取像素值分布较丰富的图像，有利于提高信息在图像中的隐写效果，增强秘密信息的隐蔽性。
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