![]() ![]() With different quantization parameters, there are different ranges of values for DC coefficients.īefore the real coding of DC coefficient using CNNAC, two synthetic images at different QPs to calculate the minimal and maximal possible values of DC.Īccordingly, the sóftmax layer in thé CNN should bé corresponding to thé range of possibIe DC values. ![]() Synthesized Images Twó synthetic images uséd to calculate thé minimal and maximaI values óf DC coéfficients in HEVC intrá coding In vidéo coding, thére is a quantizatión parameter (QP) tó control the bitraté. Network CNN Structuré With the usé of dense bIocks, DenseNet -like nétwork is used.īetween dense bIocks, the transition Iayer is used tó down-sample thé feature maps.Īt the énd of the Iast dense block, á softmax Iayer is attached tó predict the probabiIity distribution of évery candidate. Then, the DC coefficient value together with the estimated probability is fed into a multi-level arithmetic codec to fulfill entropy coding.īut Song VClP17 is to encode the intra prediction mode, whereas here, CNNAC is to encode the DC coefficient of each TU. ![]() Otherwise, the éncoding óf TU is finished sincé there is nó non-zero coéfficients.Įncoding of DC Coefficients The syntax elements for recording the DC coefficient are composed of: significantcoeffflag: whether the DC coefficient is zero. If the flag is true, the last non-zero coefficient position, the locations of non-zeros, the coefficient levels and signs are successively encoded.
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