{'fraction_non_alphanumeric': 0.019114688128772636, 'fraction_numerical': 0.019114688128772636, 'mean_word_length': 4.718390804597701, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Wavelet Sub-Band Block Coding Based Lossless High Speed Compression of Compound Image

Compression of compound image is essential for remote control software, such as real virtual network computing (VNC), which allows a person at a remote computer to view and interact with another computer across the network, as if sitting in front of the computer. A smart display device acts as a portable screen with 802.11b wireless connection to a nearby desktop PC, enabling people to surf the web or browse pictures that are stored on the desktop PC. The challenge is that the huge amount of real-time computer screen video data should be transmitted over the cable or wireless networks. One 800×600 frame of true colour screen image has a size of 1.44 MB and 85 frames/sec produces more than 100 MB data. In this paper, wavelet sub-band coding based lossless compression of compound image is discussed and the implementation shows excellent visual quality of text in compressed computer screen images.