发明名称 |
Messung der Videobildaktivität im DCT-Bereich |
摘要 |
A method of measuring the activity of a macroblock of a picture in the direct cosine transform domain of values assumed by a selected component of the video signal comprises a) separately storing in a memory blocks of data into which is divided a macroblock in the discrete cosine transform domain before quantization; b) reading from said memory the data of each of the blocks constituting said macroblock representing said selected component in the discrete cosine transform domain obtaining the respective coefficients; c) multipliying the absolute value of said coefficients by a selected mask of words of a number not exceeding the number of words constituting the block; d) summing the results of said moltiplications producing an activity coefficient for each of the blocks constituting said macroblock; e) calculating a first activity coefficient of the macroblock (actj) as the sum of said activity coefficients produced for each block; f) calculating a normalized activity value of the macroblock as the ratio between the sum of the double of said activity coefficient (actj) with a mean activity (mean_actj) relative to the preceding coded frame and the sum of the double of the coefficient mean_actj with the activity coefficient actj. <IMAGE> |
申请公布号 |
DE69940506(D1) |
申请公布日期 |
2009.04.16 |
申请号 |
DE1999640506 |
申请日期 |
1999.09.08 |
申请人 |
STMICROELECTRONICS S.R.L., AGRATE BRIANZA |
发明人 |
PAU, DANILO;BORTOT, LUCA;SACCHI, MARIA LUISA |
分类号 |
H04N7/50;H03M7/30;H04N7/26;H04N7/30 |
主分类号 |
H04N7/50 |
代理机构 |
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主权项 |
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地址 |
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