?
Встраивание информации в сжатые JPEG-изображения с минимизацией проявления демаскирующих признаков
The research of informational content of features in the spatial domain and the frequency domain of compressed JPEG-images at the stegoanalisys is presented. Selection of features with application of the greedy algorithm with an exception is made and the set of informative features on the basis of which criterion function of steganographic embedding is defined is received. Embedding is carried out by means of the algorithm on the basis of replacement operation. Knowing what features contain information about existence of the secret message in the digital image, it is possible to seek for minimization of distortions of these parameters for the purpose of maximizing obscurity of embedding as visually, and for stegoanalyzer. Experiments have shown that such approach allows when embedding more than 4000 bits into the grayscale image with size of 256×256 pixels to reach the minimum distortions of the image, holding a metrics of visual quality PSNR not lower than 52 dB, and stability before the stegoanalyzer.