Comparative Scanning Of Coins For Variations?

I think that it is fundamentally correct and a good idea. There is one already for modern world coins that works quite well.

Getting a good enough database for ancients including the worn ones would be quite a lot of work, I think.

sel_69l May I ask how you do an overlay so that you can see both images at once? As you may be able to tell my computer skills are very limited.

My take on this -- for what it's worth:

As to the final product of this discussion, the graded coin, I opine, its future is fixed. It is as fixed now as long ago when the grading scale numbered zero to seventy came of age. Why? Because the computer's numbers now, like the zero to seventy numbers then, are desperately needed, may I say, "required."

As to the underlying process that leads to the product, that is, an objectively analyzed and graded coin, consider a caliper in use in the eighteenth century. The ability of a machine to transmit a measurement in the form of a number has gone unquestioned well into this century. A modern caliper, a computer, impresses me as an advance in the science of machine based number assignment to measurable (i.e. gradable) phenomena.

Acceptance of the measure will take time and a toll, methinks. In contrast to a computer, few there are -- these days -- who'll disagree with a caliper. I read a sage reference to economic forces. To wit: it'll be done when someone sees a profit in it. Not so says me. A need to cast doubt on a caliper in defense of one's livelihood waxes rare. A last wall of defense will be the fact that the zero to seventy system relies heavily on eye appeal. The defense will falter.

There has never been a use for a caliper in determining the eye appeal of any of its incredible creations (eighteenth century coins and pocket watches to twenty first century guided missiles). Eye appeal will finally rest where it has ever rested -- outside zero to seventy. It rests, and has always rested, nowhere but in the vast chasm between buyer and seller. In the matter of eye appeal, current subjectivity will still reign; computer objectivity will never be called upon.

Doubt not: the new -age coin collecting caliper will come.

Kevin

Gincoin43


How is that done?

I have no clue.

Can it be done with coins saved as JPEG files or PNG files? All of my coin pictures are in one of those two formats.

Do I need new software?

Kcm I was actually focused on coin authentication and die typing more than grading. Grading is a swampy mire and I agree with you that a computer lacks the necessary ability to evaluate "eye appeal" because it is totally subjective.

Computer comparison would have the ability to display differences in the design of two coins proving they were struck from different dies. It is like scanning for a fingerprint authentication. It seems as if a computer would be tailor made to detect both Counterfeit coins and
die varieties of counterfeit or genuine coins.

Gincoin43 - You ask




My photographs are all either jpeg or png. I do not have an image editor on my laptop as far as I know. What would you suggest? If such a program may have come already installed on this laptop what would it be called?

@swamperbob,

Yeah, I guess I should try to be more explanatory in my posts. I got your drift, but failed to put my own within reach. When I used the terms "grade" and "grading," I had in mind all the numismatic properties TPG's concern themselves with except for eye appeal. As to that property, I wish they'd keep their opinions out of the mix. Many coins who've spent their whole lives on a battleground appeal to this man's eye more so than the lustrous cousins whose lives were spent in holders albums and safety deposit boxes.

Kevin