信息技术.连续色调静态图像的无损和近似无损压缩.第2部分:扩充

[中文适用范围]： 此建议|国际标准定义了一组无损（位保留）和近无损（其中每个重建样本的误差受预定义值限制）压缩方法，用于编码连续色调（包括双层）、灰度或彩色数字静态图像。 此建议|国际标准： ——规定了将源图像数据转换为压缩图像数据的过程的扩展（包括算术编码、近无损编码的扩展、预测的扩展和哥伦布编码的扩展）； ——指定用于将压缩图像数据转换为重建图像数据的过程的扩展，包括用于逆颜色变换的样本变换的扩展； ——指定压缩图像数据的编码表示； ——提供有关如何在实践中实施这些流程的指导。 [外文原描述]： ISO/IEC 14495-2:2003 defines a set of lossless (bit-preserving) and nearly lossless (where the error for each reconstructed sample is bounded by a predefined value) compression methods for coding continuous-tone (including bi-level), gray-scale, or colour digital still images. ISO/IEC 14495-2:2003: specifies extensions (including arithmetic coding, extension of near lossless coding, extension of prediction and extension of Golomb coding) to processes for converting source image data to compressed image data;specifies extensions to processes for converting compressed image data to reconstructed image data including an extension for sample tranformation for inverse colour transforms;specifies coded representations for compressed image data;provides guidance on how to implement these processes in practice.