This is the link I was including - http://signal.ece.utexas.edu/~queiroz/papers/ei99mrc.pdf
You link to an article by Professor Richardo de Queiroz?
Did you know he reviewed the White House PDF.
“MRC is about separating the single-image document into multiple layers, hopefully each one with a given characteristic. This has to be done automatically, in what we call segmentation. What I see in the document [White House PDF] are signs of MRC segmentation consistent with strategies in line with the techniques pioneered by DjVu. I (and my students) do not advocate doing the segmentation that way, but that is not the point either. In fact, I would not be surprised if the software which segmented the WH document was derived from some DjVu tool.”
“They first try to “lift” the text to another layer. They can find more than one type of text and place them in different layers. The rest is background and they compress with standard image compression methods. In the POBC [President Obama Birth Certificate] I see lots of signs of that. It missed a lot of text, like the R in BARACK and in many other places. The missed text is aggressively compressed with JPEG for example, which justifies the damage to those text parts.”
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“I took a birth certificate which has a similar background pattern, scanned and compressed using an older DjVu tool. It has shown the same problems as POBC, like text letters that were missed and sent to background, and multiple text styles. It didn’t have halo, though, because its algorithm decided to obliterate the whole background pattern. Perhaps if I had time to toy around with packages and parameters I might find something very close to what was used to generate the document shown by the WH, but I unfortunately do not have the time right now.”
“In summary I can only say I see much stronger signs of common MRC algorithmic processing of the image rather than some intentional manipulation.”
“Sincerely”
“Ricardo L. de Queiroz”
There are a number of PDFs available on the internet that like the White House PDF have multiple layers (one 8-bit layer and multiple 1-bit layers that is typical of MRC processing), they have pixel-for-pixel identical elements. Their 8-bit layer are always lower resolution (bigger pixel size) than the 1-bit layers (smaller pixel sizes) just like the White House PDF.
BTW, Professor de Queiroz has in the past been willing to respond to e-mail questions about MRC.