JP7111859B2 - 映像デコード方法、映像エンコード方法および記録媒体 - Google Patents
映像デコード方法、映像エンコード方法および記録媒体 Download PDFInfo
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- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/117—Filters, e.g. for pre-processing or post-processing
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
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- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
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- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
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- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
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- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
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- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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- H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
- H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/146—Data rate or code amount at the encoder output
- H04N19/147—Data rate or code amount at the encoder output according to rate distortion criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/182—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a pixel
Description
h[Z]=(A+2×Z+Q)/4
h[A]=(Z+2×A+B)/4
...
h[P]=(O+3×P)/4
h[Q]=(Z+2×Q+R)/4
...
h[X]=(W+3×X)/4
f[a1]=(2×A+4×a1+2×Q)/8
f[b1]=(2×B+6×b1)/8
f[c1]=(2×C+6×c1)/8
...
f[a2]=(2×R+6×a2)/8
f[a3]=(2×S+6×a3)/8
...
1.Vertical low-pass filter
v[a1]=(A+2×a1+a2)/4
v[a2]=(v[a1]+2×a2+a3)/4
...
v[a8]=(v[a7]+3×a8)/4
v[b1]=(B+2×b1+b2)/4
...
2.Horizontal low-pass filter
h[a1]=(Q+2×v[a1]+v[b1])/4
h[b1]=(h[a1]+2×v[b1]+v[c1])/4
...
h[h1]=(h[g1]+3×v[h1])/4
h[a2]=(R+2×v[a2]+v[b2])/4
...
Claims (5)
- 現在ブロックのイントラ予測モードおよび前記現在ブロックのサイズのうち少なくともいずれか一つに基づいて、前記現在ブロックの参照画素値に対する第1のフィルタの適用可否を決定するステップであって、前記第1のフィルタは前記現在ブロックの前記イントラ予測モードと前記現在ブロックの前記サイズとの指定された組み合わせに基づいて適用される、ステップと、
前記参照画素値を用いて前記現在ブロックの予測値を導出するステップと、
前記現在ブロックのイントラ予測モードおよび前記現在ブロックのサイズのうち少なくともいずれか一つに基づいて、前記現在ブロックの前記予測値に対する第2のフィルタの適用可否を決定し、それにより、フィルタリングされた予測値を生成するステップと、
を備え、
前記現在ブロックの前記イントラ予測モードが垂直モードの場合、前記参照画素値に隣接する前記現在ブロックの予測画素のうちの、前記現在ブロックの最も左の画素のみに前記第2のフィルタを適用することにより、前記フィルタリングされた予測値が生成される、映像デコード方法。 - 前記現在ブロックの前記イントラ予測モードは、予測モード情報(MPM;Most Probable Mode)に基づいて決定される、請求項1に記載の映像デコード方法。
- 前記現在ブロックの前記イントラ予測モードが前記垂直モードの場合、前記第2のフィルタは、前記現在ブロックの前記最も左の画素の左側に対応する左参照画素値を用いて適用される、請求項1に記載の映像デコード方法。
- 現在ブロックの参照画素値に対する第1のフィルタの適用可否、および前記現在ブロックの予測値に対する第2のフィルタの適用可否に関する情報をエンコードするステップを備え、
前記情報は、前記現在ブロックのイントラ予測モードおよび前記現在ブロックのサイズのうち少なくともいずれか一つに関し、前記第1のフィルタは前記現在ブロックの前記イントラ予測モードと前記現在ブロックの前記サイズとの指定された組み合わせに基づいて適用され、
前記現在ブロックの前記イントラ予測モードは、予測モード情報(MPM;Most Probable Mode)に基づいて決定され、
前記現在ブロックの前記イントラ予測モードが垂直モードの場合、前記参照画素値に隣接する前記現在ブロックの予測画素のうちの、前記現在ブロックの最も左の画素のみに前記第2のフィルタを適用することにより、フィルタリングされた予測値が生成される、映像エンコード方法。 - コンピュータに請求項1に記載の映像デコード方法を実行させるコンピュータプログラムを記憶したコンピュータ読み取り可能な記録媒体。
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