A Method for Extracting the Synchro Characters in the Video Information Leaked by a Computer System
Song Jian-zhong · Dianzi Ke-ji Daxue xuebao · 2007
Some common characters in the video information leaked by a computers system are the texture aracteristics which are composed of moving black areas of a reconstructed image from the leaked video formation. The texture characteristics are quite different with the varying of synchronal frequency. The moving eed of the texture increases when the synchronal error becomes larger. And the moving direction is decided by e sign of the error. According to these features, a similar Harr Wavelet method is used to extract the synchronal aracters in the video information leaked by a computer system. Based on these synchronal characters, the angles lted by the synchronal error are used to adjust the frequency of the synchronal pulses until the synchronal curacy is enough for steady display.