Title :
A video system for transmitting hidden pictures based on CCITT T.4 2-D compression
Author :
Leelarasmee, Ekachai ; Vattanaliangjai, Nuntakrit
Author_Institution :
Dept. of Electr. Eng., Chulalongkorn Univ., Bangkok, Thailand
Abstract :
The use of vertical blanking intervals in a PAL video signal for transmitting an animation of 112×128 dots of black and white picture is proposed. Data compression based on CCITT T.4 2-D standard and low data rate of 500 kbit/sec are chosen to make the hardware design of an inserter and decoder economically feasible to using an 8-bit microcontroller. The inserter is designed to hide 48 bytes of compressed data, generated by a personal computer, within lines 7 to 22 of a PAL video signal. The decoder can extract these data, decompress and display the hidden picture on the lower right position of a normal TV screen. The basic building blocks of these two devices will be described. This system can be used to provide a Sign Language Closed Caption service
Keywords :
data compression; decoding; handicapped aids; video coding; 500 kbit/s; 8 bit; CCITT T.4 2D compression; PAL video signal; Sign Language Closed Caption service; data compression; decoder; hardware design; hidden picture transmission; inserter; vertical blanking intervals; video system; Animation; Blanking; Data compression; Decoding; Hardware; Microcomputers; Microcontrollers; Signal design; Signal generators; Video compression;
Conference_Titel :
Circuits and Systems, 2000. IEEE APCCAS 2000. The 2000 IEEE Asia-Pacific Conference on
Conference_Location :
Tianjin
Print_ISBN :
0-7803-6253-5
DOI :
10.1109/APCCAS.2000.913626
