CPC H04N 19/61 (2014.11) [H04N 19/107 (2014.11); H04N 19/124 (2014.11); H04N 19/13 (2014.11); H04N 19/14 (2014.11); H04N 19/182 (2014.11)] | 10 Claims |
1. A method for encoding a video signal based on an Edge Adaptive Graph-Based Transform (EA-GBT), comprising:
detecting, by a processor, a step edge or a ramp edge from a residual signal;
generating, by the processor, a graph signal based on at least one of the step edge or the ramp edge;
obtaining, by the processor, an EA-GBT coefficient by performing the EA-GBT for the graph signal;
quantizing, by the processor, the EA-GBT coefficient; and
entropy-encoding, by the processor, the quantized EA-GBT coefficient,
wherein the step of generating the graph signal includes:
searching a center ramp pixel having a gradient greater than a threshold value;
initializing a position of the center ramp pixel;
searching the position of the center ramp pixel with five possible directions according to a priority;
allocating a probability for each of direction information; and
encoding the direction information with the allocated probability,
wherein the direction information represents a direction of progress between two consecutive pixels.
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