摘要:
The present invention provides a scrambled compressed data distribution device that can perform a high-resistance scrambled compressed data distribution by selectively using a plurality of types of scramble information and a playback device thereof.A scrambling section scrambles compressed data by unique one of a plurality of scrambling methods. A hash value calculating section determines a hash value based on data b in a position where digital watermark data is not embedded, and an encrypting section encrypts the hash value with a secret key Sk(n) corresponding to the scrambling method and outputs an encrypted hash value c. A watermark data embedding section embeds the encrypted hash value in a watermark data embedding position of the data b and transmits the same as a compressed data stream d.
摘要:
The present invention provides a scrambled compressed data distribution device that can perform a high-resistance scrambled compressed data distribution by selectively using a plurality of types of scramble information and a playback device thereof. A scrambling section scrambles compressed data by unique one of a plurality of scrambling methods. A hash value calculating section determines a hash value based on data b in a position where digital watermark data is not embedded, and an encrypting section encrypts the hash value with a secret key Sk(n) corresponding to the scrambling method and outputs an encrypted hash value c. A watermark data embedding section embeds the encrypted hash value in a watermark data embedding position of the data b and transmits the same as a compressed data stream d.
摘要:
The present invention provides a scrambled compressed data distribution device that can perform a high-resistance scrambled compressed data distribution by selectively using a plurality of types of scramble information and a playback device thereof.A scrambling section scrambles compressed data by unique one of a plurality of scrambling methods. A hash value calculating section determines a hash value based on data b in a position where digital watermark data is not embedded, and an encrypting section encrypts the hash value with a secret key Sk(n) corresponding to the scrambling method and outputs an encrypted hash value c. A watermark data embedding section embeds the encrypted hash value in a watermark data embedding position of the data b and transmits the same as a compressed data stream d.
摘要:
The present invention provides a scrambled compressed data distribution device that can perform a high-resistance scrambled compressed data distribution by selectively using a plurality of types of scramble information and a playback device thereof.A scrambling section scrambles compressed data by unique one of a plurality of scrambling methods. A hash value calculating section determines a hash value based on data b in a position where digital watermark data is not embedded, and an encrypting section encrypts the hash value with a secret key Sk(n) corresponding to the scrambling method and outputs an encrypted hash value c. A watermark data embedding section embeds the encrypted hash value in a watermark data embedding position of the data b and transmits the same as a compressed data stream d.
摘要:
A barcode-embedding area is obtained in a color image based on expression possibility by the juxtaposed additive color mixture and possibility of reading of pixels separately by a barcode reader (S11), a color image in the barcode-embedding area is expressed by the juxtaposed additive color mixture, and color images for the code area and the background area, which are readable by the barcode reader, are created (S12, S13), a color-image-superimposed barcode image is created by using the color images for the code area and the background area, and the same color-image-superimposed barcode image is embedded in the barcode-embedding area (S14), and the color-image-superimposed barcode image and the original color image are corrected if necessary (S15, S16).
摘要:
The present invention provides an electronic watermark editor for a compressed video that can efficiently carry out editing such as deletion or rewriting of electronic watermark data.DCT coefficient values are extracted while applying all templates to video contents, and a template where a total sum of relative absolute value differences between pairs of the DCT coefficient values is maximized is judged to be an applied template. The pairs of DCT coefficient values extracted by the applied template are processed by a smoothing process section so that the relative differences are reduced and so as to reduce individual relative differences recursively until significant differences between the coefficient value pairs are statistically eliminated. In addition, the pairs of DCT coefficient values extracted by the applied template are replaced with new editing bits.
摘要:
First, a set of seed images that tally with each other are prepared (S101). Next, a set of threshold matrices are created from the set of seed images (S102) Next, a plurality of tally images are created from an input gray-scale image by using the set of threshold matrices (S103). The tally images are combined, whereby the confidential image is decoded.
摘要:
This invention aims to form hierarchies of coded moving picture data in a simple method or apparatus. An I, P and B separator separates I, P and B picture data from coded moving picture data. A first to a third header/low/high separator separate headers and low and high DCT data components of the separated I, P and B picture data, and hierarchy forming means assigns the outputs of the separators for a 1-st to a 6-th hierarchy by supplying the outputs to packetizers therefor. The packetizers packetize the assigned data, and send out the packetized data on communication lines for the 1-st to 6-th hierarchies. For example, low frequency components of I picture data are provided as the 1-st hierarchy, high frequency components of I picture data are provided to the 2-nd hierarchy, low frequency components of P picture data are provided as the 3-rd hierarchy, high frequency components of P picture data are provided as the 4-th hierarchy, low frequency components of B picture data are provided as the 5-th hierarchy, and high frequency components of P picture data are provided as the 6-th hierarchy.
摘要:
An encoding control unit obtains a quantization step size and a video encoding rate Rc on the basis of various kinds of conditions including a transmission time and image quality specified through an input unit by a user, and property of image contents from a signal compression processing unit. Next, the video encoding rate Rc is compared with a network transmission rate Rt which is obtained through a network IF unit. Then, if the transmission rate Rt of the network is smaller than the video encoding rate Rc and is present in the range any of values of which is equal to or larger than the value smaller than Rc by a predetermined quantity, then the quantization step size is corrected in such a way that the video encoding rate Rc is equal to or smaller than the transmission rate Rt of the network, or in such a way that the video encoding rate Rc is increased. As a result, it is possible to provide an apparatus for transmitting dubbing data of a digital VTR which is capable of suppressing the degradation of a transmission throughput.
摘要:
A second tally image generating means 20 that outputs a pixel value B1m,n of a second tally image B1 includes a decoding-time peripheral luminance value calculating section composed of a decoded pixel value calculating means 28 and a peripheral luminance value calculating means 29. The decoding-time peripheral luminance value calculating means 29 calculates a luminance value dm,n around a currently processed pixel. A confidential-image embedding means 26 calculates a pixel value B1m,n of a second tally image B1 by use of a temporarily determined pixel value B1tm,n, a luminance value Sm,n of a confidential image S, a pixel value B0m,n of a first tally image B0 and the peripheral luminance value dm,n.