Image Topic in RosJava

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HI, I am trying to work with Image Topics in Rosjava, I have done a Subscriber to the Image topic, but I have some problems:

• I need to know about the internal structure in the ChannelBuffer Object that represents data in Image Topic and ImageCompresed topic .
• Also I need to send this image over sockets to an Android Device and show it as an Image, I was trying to serialize the Channel Buffer Object, but I failed