SEO question on H1 Tag using Image

Hi all - I have a web page that was not designed by us.  I am adding some basic SEO.
I notice in the H1 tag something I haven't seen before ... an image and no text. The code looks like this:

       <a href="index.html"><img src="" alt="Example Inc" /></a>

Before I take the image outside of the H1 Tag and change the H1 to contain Text only, is there a good reason why someone would write the H! this way?
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Dr. KlahnPrincipal Software EngineerCommented:
The only reasons I can possibly think of for doing this, and they would be a very poor reasons, would be if the image was very small and the original author wanted (a) the hyperlinked image to occupy at least the vertical space used by a H1 line, or (b) prevent anything else from appearing in the same vertical space due to the exclusionary nature of Hn lines.

I think if you pull the Header Level tags out from around the hyperlink you'll find it acts just the same.

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Bryr de GraySEO TechnicianCommented:
Maybe there was a text that was deleted in between the h1 tags. I don't think H1 is useful for images anyway.
Lavi GuptaCommented:
H1 tag is the main heading tag of the page and should not be used more than one time in a page. I don't think so, that H1 tag gives any weightage to Alt tags..
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