Adjusting quantization to preserve non-zero AC coe
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
专利名称：Adjusting quantization to preserve non-zero
AC coefficients
发明人：Pohsiang Hsu,Chih-Lung Lin,Xiping Zuo
申请号：US11400741
申请日：20060407
公开号：US20070237221A1
公开日：
20071011
专利内容由知识产权出版社提供
专利附图：
摘要：A video encoder identifies one or more AC coefficients of each of plural blocks in the picture. The encoder identifies a threshold quantization step size such that the identified AC coefficient(s) of each of the plural blocks are nonzero after quantization
according to the threshold quantization step size. The threshold quantization step size is such that quantization according to the next higher quantization step size would result in at least one of the identified AC coefficient(s) of at least one of the plural blocks being zero. For example, identifying the threshold quantization step size comprises identifying n top AC coefficients in each of four blocks of a macroblock, determining the smallest AC coefficient among the identified n top AC coefficients of the four blocks, and iteratively evaluating the smallest AC coefficient with respect to candidate quantization step sizes until the threshold quantization step size is identified.
申请人：Pohsiang Hsu,Chih-Lung Lin,Xiping Zuo
地址：Redmond WA US,Redmond WA US,Kirkland WA US
国籍：US,US,US
更多信息请下载全文后查看