finally i settled on this code. I am passing image file name and creating image.
add(new NonCachingImage("imgPlc", new AbstractReadOnlyModel<DynamicImageResource>(){
@Override public DynamicImageResource getObject() {
DynamicImageResource dir = new DynamicImageResource() {
@Override protected byte[] getImageData(Attributes attributes) {
StringValue name = parameters.get("name");
byte[] imageBytes = null;
if(name.isEmpty() == false)
imageBytes = getImageAsBytes(name.toString());
return imageBytes;
}
};
dir.setFormat("image/png");
return dir;
}
}));