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发明授权
CN101253761B 图像编码设备和图像编码方法 失效 - 权利终止

图像编码设备和图像编码方法
摘要：
摄像设备100首先对原始数据执行JPEG编码。基于所获得的JPEG图像数据的压缩比，摄像设备100选择霍夫曼表以对原始数据进行编码。对于所获得的JPEG数据的较高压缩比，摄像设备100假定原始数据是具有较大量低频分量的图像数据。因而摄像设备100选择向绝对值较小的预测微分值分配特别短的代码的霍夫曼表。相反，对于所获得的JPEG图像数据的较低压缩比，摄像设备100选择向预测微分值分配相对等长的代码的霍夫曼表，而不管预测微分值的绝对值如何。
摘要（英）：

An image capturing apparatus 100 first executes JPEG encoding on RAW data. On the basis of the compression ratio of JPEG image data obtained, the image capturing apparatus 100 selects a Huffman table to encode the RAW data. With the higher compression ratio of the JPEG data obtained, the image capturing apparatus 100 assumes that the RAW data is image data with a larger number of low frequency components. The image capturing apparatus 100 thus selects a Huffman table that assigns a particularly short code to a predictive differential value with a smaller absolute value. In contrast, with the lower compression ratio of the JPEG image data obtained, the image capturing apparatus 100 selects a Huffman table that assigns a code of a relatively equal length to the predictive differential valueregardless of its absolute value.

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