用于解码器测试的 JPEG 图像库?
我正在为硬件 JPEG 解码器编写一个接口,并且正在寻找一些测试图像。
在硬件解压之前,软件前端必须解析JFIF和/或EXIF数据以获得图像尺寸和缩略图。在测试中,我发现我当前的版本可以很好地处理从当代数码傻瓜相机获得的图像。一般来说,解析器从 SOF 段获取尺寸,并从 EXIF 数据中检索缩略图(如果缩略图存在)。
我正在寻找更广泛的测试图像来更全面地评估系统。例如,我无法找到任何在 JFXX(即第二个 APP0)标记中对缩略图进行编码的 JPEG 图像。此外,我想在各种图像(尺寸、逐行扫描等)上测试代码。该代码适用于专门的消费产品,预计将从一系列新旧数码相机中获取图像。
建议?
I'm writing an interface for a hardware JPEG decoder, and I'm looking for some test images.
Prior to hardware decompression, the software front-end must parse the JFIF and/or EXIF data to obtain the image dimensions and thumbnail. In testing, I found that my current version works well with images obtained from contemporary digital point-n-shoot cameras. In general, the parser obtains the dimensions from the SOF segment, and the thumbnail is retrieved from the EXIF data (if the thumbnail exists).
I'm looking for a broader range of test images to evaluate the system more exhaustively. For example, I have been unable to find any JPEG images that encode the thumbnail in a JFXX (i.e., second APP0) marker. Furthermore, I would like to test the code on a wide variety of images (sizes, progressive scans, etc.). This code is destined for a specialized consumer product, and images are expected to be obtained from a range of digital cameras, both old and new.
Suggestions?
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