ISO/IEC 19794-6:2005规定了利用虹膜识别的生物认证系统的两种替代图像交换格式。 第一种基于直线图像存储格式，该格式可以是强度值的原始未压缩数组，也可以是ISO/IEC 15444规定的压缩格式。 第二种格式基于极坐标图像规范，该规范需要特定的预处理和图像分割步骤，但生成的数据结构更紧凑，只包含虹膜信息。 符合ISO/IEC 19794-6:2005中规定的任一虹膜图像格式的数据拟嵌入ISO/IEC 19785-1中规定的CBEFF生物识别数据块（BDB）中的CBEFF兼容结构中。

ISO/IEC 19794-6:2005 specifies two alternative image interchange formats for biometric authentication systems that utilize iris recognition. The first is based on a rectilinear image storage format that may be a raw, uncompressed array of intensity values or a compressed format such as that specified by ISO/IEC 15444. The second format is based on a polar image specification that requires certain pre-processing and image segmentation steps, but produces a much more compact data structure that contains only iris information. Data that comply with either one of the iris image formats specified in ISO/IEC 19794-6:2005 are intended to be embedded in a CBEFF-compliant structure in the CBEFF Biometric Data Block (BDB) as specified in ISO/IEC 19785-1.