Метод Маскувального Ущільнення Службових Даних В Системах Компресії Відеозображень

Abstract

The demand for video privacy is constantly increasing. Simultaneously, it is necessary to solve an urgent scientific and applied problem, which consists in increasing the confidentiality of video information under conditions of a given time delay for its processing and delivery, while ensuring its reliability. The crypto compression transformations can be used to solve it. A service component is used as a conversion key, which is directly formed in the conversion process and contains information about the identified structural characteristics of the video data. Therefore, such information requires confidentiality. The existing methods of cryptography are designed to process a universal data stream and do not consider the structure and features of service components. It leads to the formation of redundant data, the use of an excessive number of operations, and an increase in processing time in the process of protecting service information using universal cryptography methods. Therefore, the article aims to develop a method for masking service data compression to ensure their confidentiality, considering the peculiarities of their formation by crypto compression methods. In modes with controlled loss of information quality, the elements of the service component are formed in a reduced dynamic range. Their length is 7 bits. To ensure the confidentiality of such elements, it is necessary to develop a method for masking overhead compression in video compression systems. On the one hand, overhead blocks should not contain redundant information. On the other hand, they must be formed from bit positions from different elements of the service components. On the other hand, they should be formed from bit positions from different elements of the service components. For that, it is proposed to organize the assembly of the elements of the service components. It is organized by combining 7-bit elements of service components into 8-bit complete sequences. Encryption blocks are formed from 8-bit sequences. The assembly of service components ensures the mixing of service data and reducing their quantity. To violate the structure of the representation of service components, it is proposed to additionally organize the permutation of 8-bit completed sequences. It provides a significant dispersion of the bit positions of the 7-bit overhead elements and the destruction of the correlation between the overhead elements. The correlation coefficients of the original and reconstructed images using encrypted service components are in the region of 0. The number of changing pixels is above the theoretical threshold value of 99.5341%.

Devising a conceptual method for generating cryptocompression codograms of images without loss of information quality

“…Evaluation of the effectiveness of ensuring the protection of service components at the third cascade of processing is reported in work [20]. The results of estimating the compression ratio of test images by the conceptual method of cryptocompression coding in a differentiated basis without loss of information quality at different parameters m and n of the block A (γ, χ) of video data processing for some test images are given in Table 6.…”

“…For the case of data processing in a reduced dynamic range, it is proposed to use the method of masking compaction of service data in compression systems [20].…”

Розробка Методу Криптокомпресійного Кодування Зображень На Основі Плаваючої Недетермінованої Схеми Обробки

“…Лінеаризація організовується в горизонтальному напрямку по рядках. Після другого каскаду кодування сформовані службові данні КККдг піддаються шифруванню на основі розроблено методу маскувального ущільнення службових даних в системах компресії відеозображень [2].…”