Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve conference-proceedings-of-spie/5638/0000/Fast-Ronchi-test-base-on-a-liquid-crystal-display/10.1117/12.574093.full, which is not a DOI.
conference-proceedings-of-spie/5638/0000/Fast-Ronchi-test-base-on-a-liquid-crystal-display/10.1117/12.574093.full may be a Handle (DOIs are a special sort of Handle). If conference-proceedings-of-spie/5638/0000/Fast-Ronchi-test-base-on-a-liquid-crystal-display/10.1117/12.574093.full is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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