使用 matlab 处理 ljpeg(无损 jpeg)
我现在正在处理DDSM数据库(用于筛查乳腺X线摄影的数字数据库)..它的缺点是它的扩展。它的扩展名是ljpeg(无损jpeg),它是一个非常不支持的扩展。我想使用 matlab 读取它们或将它们转换为广泛支持的任何其他类型。感谢
I am dealing now with DDSM database (Digital Database for Screening Mammography) .. its disadvantage is its extension. It is extension is ljpeg (lossless jpeg) which it is very poorly supported extension. I want to read them using matlab or converting them to any other type which is widely supported. thank
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我知道在 http://www.ddsm.jpeg 程序的 Linux 上有一个工作版本。 cs.unibo.it/~roffilli/sw.html
我编译并测试了它。我使用此处描述的 MATLAB 代码来查看图像。
仅对于某些扫描仪才能正确显示。
如论文 http://citeseerx.ist.psu 中所述。 edu/viewdoc/summary?doi=10.1.1.111.3846
正确编译后,DDSM 软件将图像数据输出为原始字节流;然后,必须根据用于对原始胶片进行成像的数字化仪的模型对这些进行标准化,然后创建可由图像分析软件环境读取的图像文件。
*编辑:*
我找到了一个完整解决方案,可以下载、规范化(基于扫描仪)并将 DDSM 图像转换为 PNG 格式。 Chris Rose 博士编写了该程序,请在他的网站下载
http://microserf.org.uk /academic/Software.html
I know there is a working version of DDSM's jpeg program for linux at http://www.cs.unibo.it/~roffilli/sw.html
I compiled and tested it. I used the MATLAB code as described here to view the images.
It displays correctly only for some scanners.
As described in the paper http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.111.3846
When properly compiled, the DDSM software outputs the image data as a stream of raw bytes; one then has to normalise these according to the model of digitiser used to image the original films and then create an image file that is readable by one’s image analysis software environment.
*EDIT: *
I found a complete solution that downloads, normalizes (based on the scanner) and converts the DDSM image to PNG format. Dr. Chris Rose wrote that program, please download it on his website
http://microserf.org.uk/academic/Software.html