SDK“图象域”本质是一个button类型的表单域。所以得按照e_TypePushButton类型获取，再通过widget.setMKNormalIconImage替换它的图标即可。

JAVA示例代码如下：

  public  static void GetField() throws PDFException {
	  PDFDoc doc=new PDFDoc("D:\\表单\\test_ImageField.pdf");
	  doc.load(null);
	  Form form = new Form(doc);
	  for (int pageIndex=0;pageIndex<doc.getPageCount();pageIndex++)
	  {
		  PDFPage page= doc.getPage(pageIndex);
		  page.startParse(0,null,true);
		  int controlCount= form.getControlCount(page);
		  for(int ctrIndex=0;ctrIndex<controlCount;ctrIndex++)
		  {
			  Control control= form.getControl(page,ctrIndex);
			  Field field=control.getField();
			  int fieldType= field.getType();
			if(fieldType==Field.e_TypePushButton)
			{
 				   Widget widget= control.getWidget();
  				   String strName= field.getName();
 				    if(strName.contains("图像域")) 
 				   {
   				   	Image image = new Image("D:\\test\\foxitLogo.png");
   				   	widget.setMKNormalIconImage(image, 0);
   				   	widget.resetAppearanceStream();
  				   }
 			}

		  }
	  }
	  doc.saveAs("D:\\表单\\result.pdf",0);
  }