Rendering a dynamic image(blob) in a BI Publisher Report via an RTF templat

Been working on this for a while and now at a dead end hoping the experts can direct me to try something new. There is lots in the forums on blobs and displaying in reports and from it all I have gleaned that I need to encode the blob in Base64 and then use this code.
<fo:instream-foreign-object content type="image/jpg">
<xsl:value-of select="IMAGE_ELEMENT"/>
</fo:instream-foreign-object>
I use this function to encode a 9KB jpeg into a clob (and my jpegs will be less then 32K.
function encode_base64(p_blob_in in blob) return clob is
v_clob clob;
v_result clob;
v_offset integer;
v_chunk_size binary_integer := (48 / 4) * 3;
v_buffer_varchar varchar2(48);
v_buffer_raw raw(48);
begin
if p_blob_in is null then
return null;
end if;
dbms_lob.createtemporary(v_clob, true);
v_offset := 1;
for i in 1 .. ceil(dbms_lob.getlength(p_blob_in) / v_chunk_size) loop
dbms_lob.read(p_blob_in, v_chunk_size, v_offset, v_buffer_raw);
v_buffer_raw := utl_encode.base64_encode(v_buffer_raw);
v_buffer_varchar := utl_raw.cast_to_varchar2(v_buffer_raw);
dbms_lob.writeappend(v_clob, length(v_buffer_varchar), v_buffer_varchar);
v_offset := v_offset + v_chunk_size;
end loop;
v_result := v_clob;
dbms_lob.freetemporary(v_clob);
return v_result;
end encode_base64;
The xml is simple:
<?xml version="1.0" encoding="UTF-8"?>
<ROWSET>
<ROW>
<IMAGE_NAME>Test</IMAGE_NAME>
<IMAGE_MIME_TYPE> image/jpeg </IMAGE_MIME_TYPE>
<IMAGE_ELEMENT>…lots lines of encoded data… </ IMAGE_ELEMENT >
</ROW>
</ROWSET>
Then when I put all together using BI Publisher Desktop 11.1.1.6 in an rtf template and preview the pdf, the preview fails with a long message ( can provide the whole thing if requested) but starting with:
java.lang.ArrayIndexOutOfBoundsException: 0
     at oracle.xdo.common.image.ImageReader.checkFormat(ImageReader.java:130)
     at oracle.xdo.common.image.ImageReader.analyze
I suspect the base64 encoding may be the problem but I am out of my realm in trying to debug this. Any help would be most appreciated…sorry for the length of this.

I thank you again for continuing to try to help me. However, I regret to say that this function does not work. The same error results (see below). It is hard to believe that this cannot be done with APEX and BI Publisher. I would think that other APEX users have the need to display images and do not have the E-Business Suite.
What I am doing is very straightforward....a small jpeg stored as a blob in an Oracle table that needs to be dynamically displayed from a report in APEX----created with BI Publisher and an rtf template.
If you have any other ideas, please send them..your help is appreciated.
Java.lang.ArrayIndexOutOfBoundsException: 0
     at oracle.xdo.common.image.ImageReader.checkFormat(ImageReader.java:130)
     at oracle.xdo.common.image.ImageReader.analyze(ImageReader.java:314)
     at oracle.xdo.common.image.ImageReader.load(ImageReader.java:510)
     at oracle.xdo.generator.pdf.PDFGenerator.createPDFImageReference(PDFGenerator.java:3261)
     at oracle.xdo.generator.pdf.PDFGenerator.getImage(PDFGenerator.java:3399)
     at oracle.xdo.generator.pdf.PDFGenerator.getImage(PDFGenerator.java:3388)
     at oracle.xdo.generator.ProxyStreamGenerator.getImage(ProxyStreamGenerator.java:121)
     at oracle.xdo.template.fo.area.AreaTree.getImage(AreaTree.java:779)
     at oracle.xdo.template.fo.area.InstreamForeignObjectArea.loadImage(InstreamForeignObjectArea.java:82)
     at oracle.xdo.template.fo.area.InstreamForeignObjectArea.init(InstreamForeignObjectArea.java:151)
     at oracle.xdo.template.fo.area.GraphicArea.<init>(GraphicArea.java:80)
     at oracle.xdo.template.fo.area.InstreamForeignObjectArea.<init>(InstreamForeignObjectArea.java:51)
     at oracle.xdo.template.fo.elements.FOInstreamForeignObject.doLayout(FOInstreamForeignObject.java:134)
     at oracle.xdo.template.fo.elements.FOInline.doLayout(FOInline.java:147)
     at oracle.xdo.template.fo.elements.FOInline.doLayout(FOInline.java:83)
     at oracle.xdo.template.fo.elements.FOBlock.doLayout(FOBlock.java:330)
     at oracle.xdo.template.fo.elements.FOBlock.doLayout(FOBlock.java:226)
     at oracle.xdo.template.fo.elements.FOBlock.doLayout(FOBlock.java:140)
     at oracle.xdo.template.fo.elements.FOFlow.doLayout(FOFlow.java:84)
     at oracle.xdo.template.fo.elements.FormattingEngine.startLayout(FormattingEngine.java:250)
     at oracle.xdo.template.fo.elements.FormattingEngine.run(FormattingEngine.java:141)
     at oracle.xdo.template.fo.FOHandler.endElement(FOHandler.java:720)
     at oracle.xdo.common.xml.XSLTHandler$EEEntry.sendEvent(XSLTHandler.java:595)
     at oracle.xdo.common.xml.XSLTMerger.startElement(XSLTMerger.java:51)
     at oracle.xdo11g.parser.v2.XMLContentHandler.startElement(XMLContentHandler.java:182)
     at oracle.xdo11g.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1322)
     at oracle.xdo11g.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:366)
     at oracle.xdo11g.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:312)
     at oracle.xdo11g.parser.v2.XMLParser.parse(XMLParser.java:218)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at oracle.xdo.common.xml.XDOSAXParser.invokeParse(XDOSAXParser.java:166)
     at oracle.xdo.common.xml.XDOSAXParser.parse(XDOSAXParser.java:122)
     at oracle.xdo.template.fo.FOProcessingEngine.process(FOProcessingEngine.java:407)
     at oracle.xdo.template.FOProcessor.generate(FOProcessor.java:1218)
     at RTF2PDF2.runRTFto(RTF2PDF2.java:473)
     at RTF2PDF2.runXDO(RTF2PDF2.java:337)
     at RTF2PDF2.main(RTF2PDF2.java:230)

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