Skeletonize using imagej in java

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Java

image-processing

I`m trying to get skeleton of an an Binary image in java. I used Imagej library in Java whit this code:

new ByteProcessor(Image).skeletonize();

Image : link

Result(my code) : link

Result(ImageJ app) : link

Problem : for each Image , this code get me one-line image without any branches. Why? Is another implementation for skeletonize in Java?