| 摘要 |
PROBLEM TO BE SOLVED: To provide a de-blocking filter that reduces distortion such as block distortion and mosquito distortion produced on a decoded image even when a coding efficiency is high in the high efficiency coding transmission system that adopts orthogonal transform such as discrete cosine transform(DCT) as a backbone technology. SOLUTION: The filter is provided with pluralities of low pass filters 1-N with different interruption characteristics including through-characteristics, any of the low pass filters 1-N is selected for each pixel (1) depending on a motion quantity based on a frame difference and an inter-pixel difference (edge) and the filtered signal is outputted (3). Furthermore, the selection of the low pass filters 1-N is limited by a quantization parameter describing a quantization characteristic of an orthogonal transform coefficient (4). |
