Abstract
For the transmission of PAL TV signals, the data rate of the luminance signal should not exceed 3-3.4 bit/pel, and the quality should fulfil the TV signal transmission standard. We suggested a synthetic high coding combined with DPCM coding for the luminance signal to meet the requirement. A 1-D FIR filter is used for filtering out the low signals. The sampling rate of low signal is lowered by subsampling and the signals are then coded in the usual DPCM manner. The difference of the luminance signal of present picture element with its previous picture element, when it exceeds a threshold, is the edge signal. The edges are then separated into two kinds, the relevant edges and non-relevant edges, according to the masking effect of visual perception. Those edges that can be discarded, which can not be perceived visually when the reconstructed picture is compared with the original picture, are non-relevant edges. The relevant signals and their addresses are coded and called the high signal. We have obtained a coding rate of 3.3 bit/pel for the luminance signal. The quality of the coded picture is similar to an 8 bit/pel PCM picture by subjective test. The errors in different steps of the coding are discussed. The limitation of the method is also discussed.
Published Version
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