ISO/IEC 21122-4:2022本文件规定了框架、概念、测试方法以及要求符合ISO/IEC 2122系列多个部分的标准。它列出了一致性测试程序
本文件规定:
-执行ISO/IEC 21122-1的解码器的一致性测试程序。
-检查ISO/IEC 21122-1解码器符合哪个一致性点的测试，即解码器是否满足严格一致性或宽松一致性所需的错误边界
-执行ISO/IEC 21122-3的解码器的一致性测试程序。
-检查码流是否符合ISO/IEC 21122-1的测试。因此，它提供了测试编码器实现是否生成语法正确的码流，以及由此类实现生成的码流是否遵循特定配置文件、级别和子级别的要求，以及它们所隐含的缓冲区模型的方法。
-检查文件是否符合ISO/IEC 21122-3的测试。
-一致性测试程序，用于测试代码流是否符合ISO/IEC 21122-2中规定的任何配置文件。
-一致性测试程序，用于测试代码流是否符合ISO/IEC 21122-2中规定的缓冲区模型，作为配置文件、级别和子级别的一部分
-解码器测试程序中使用的码流、解码图像和错误度量
-缓冲器模型测试
-抽象测试套件
注意:本文件未规定:
-测试从子采样图像格式重建全分辨率图像。特别是，从4:2:2或4:2:0到4:4:4采样的上采样是非标准扩展，因此其测试超出了本文件的范围
-测试ISO/IEC 21122重构的样本值的转换- 通过ISO/IEC 21122-3的颜色规格框，3个解码器到目标颜色空间。
-测试从ISO/IEC 21122-3文件或代码流重建的图像的背景和前景组成，这些文件或代码包含携带不透明度信息的辅助通道
-彩色滤光片阵列图像到全比例彩色图像的插值测试；该过程没有规范定义，超出了本文件的范围
-验收测试:确定实现是否满足验收标准并使用户能够确定是否接受该实现的过程。这包括规划和执行几种测试（例如功能、质量和速度性能测试），以证明实现满足用户需求。
-性能测试:测量被测实现（IUT）在各种条件下的性能特征，如吞吐量、响应性等
-健壮性测试:确定一个实现能够在多大程度上隐藏问题，从而避免试图从格式错误的代码流中重建图像的过程。

ISO/IEC 21122-4:2022 This document specifies the framework, concepts, methodology for testing, and criteria to be achieved to claim conformance to multiple parts of the ISO/IEC 21122 series. It lists the conformance testing procedures.
This document specifies:
- Conformance testing procedures for decoders implementing ISO/IEC 21122-1.
- Tests to check which conformance point an ISO/IEC 21122-1 decoder conforms to, that is, whether a decoder satisfies the error bounds required for strict or relaxed conformance.
- Conformance testing procedures for decoders implementing ISO/IEC 21122-3.
- Tests to check codestreams for conformance to ISO/IEC 21122-1. As such, it provides means to test whether encoder implementations generate syntactically correct codestreams, and whether codestreams generated by such implementations follow the requirements of a particular profile, level and sublevel, and the buffer model implied by them.
- Tests to check files for conformance to ISO/IEC 21122-3.
- Conformance testing procedures that allow testing whether codestreams conform to any of the profiles specified in ISO/IEC 21122-2.
- Conformance testing procedures that allow testing whether codestreams conform to the buffer model specified in ISO/IEC 21122-2 as part of a profile, level and sublevel.
- Codestreams, decoded images, and error metrics to be used within the decoder testing procedures.
- A buffer model test.
- Abstract test suites.
NOTE: This document does not specify:
- Testing the reconstruction of a full resolution image from a subsampled image format. In particular, upsampling from 4:2:2 or 4:2:0 to 4:4:4 sampling is a non-normative extension and as such its testing is beyond the scope of this document.
- Testing the conversion of the sample values reconstructed by an ISO/IEC 21122-3 decoder to the target colour space by means of the colour specification box of ISO/IEC 21122-3.
- Testing of the composition of background and foreground for images reconstructed from ISO/IEC 21122-3 files or codestreams that contain auxiliary channels carrying opacity information.
- Testing of the interpolation of a colour filter array image to a full scale colour image; this process is not normatively defined and beyond the scope of this document.
- Acceptance testing: the process of determining whether an implementation satisfies acceptance criteria and enables the user to determine whether or not to accept the implementation. This includes the planning and execution of several kinds of tests (e.g. functionality, quality, and speed performance testing) that demonstrate that the implementation satisfies the user requirements.
- Performance testing: measures the performance characteristics of an implementation under test (IUT) such as its throughput, responsiveness, etc. under various conditions.
- Robustness testing: the process of determining how well an implementation is able to conceal problems from attempting to reconstruct an image from an ill-formed codestream.