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If you know the size of subject, physical size of camera sensor and used focal lenght... it might be possible. But if you have never done anything like that, it might be bit complicated to start with. 
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Just wondering.<br />
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Thanks.
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I have never done an image processing, and do not even know the correct Topic Area (Please suggest different ones if you know it)<br />
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I my program to open a picture of a subject, and calculate the distance the camera was from that subject. &nbsp;Is that possible?<br />
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newbieweb
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I have never done an image processing, and do not even know the correct Topic Area (Please suggest different ones if you know it)

I my program to open a picture of a subject, and calculate the distance the camera was from that subject.  Is that possible?

newbieweb

If you know the size of subject, physical size of camera sensor and used focal lenght... it might be possible. But if you have never done anything like that, it might be bit complicated to start with. 

Calculating distance from the subject

Optical character recognition (OCR) is the mechanical or electronic conversion of images of typed, handwritten or printed text into machine-encoded text. It is widely used as a form of data entry from printed paper data records, including passport documents, invoices, bank statements, computerized receipts, business cards, mail, printouts of static-data, or any suitable documentation. It is a common method of digitizing printed texts so that it can be electronically edited, searched, stored more compactly, displayed on-line, and used in machine processes such as machine translation, text-to-speech, key data and text mining. OCR is a field of research in pattern recognition, artificial intelligence and computer vision.

Photo and imaging software is used to edit and compose raster images; Adobe Photoshop, which dominates the market, has its own topic. Common actions include cropping, slicing, retouching, color replacement, masking and erasing. Other programs include Apple Photo, Corel PaintShop Pro, GIMP, Serif PhotoPlus, Pixlr, PhotoScape, Picasa and IrfanView.

Images and Photos

Document imaging is an information technology category for systems capable of replicating documents commonly used in business. Document imaging systems can take many forms including microfilm, on demand printers, facsimile machines, copiers, multifunction printers, document scanners, computer output microfilm (COM) and archive writers. Document imaging is a form of enterprise content management, built around the need to manage and secure the escalating volume of electronic documents (spreadsheets, word-processing documents, PDFs, e-mails) created in organizations.