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Step 12The camera
Chances are you are going to press your precious personal digital camera into service on this stand and that is fine; more than likely it will exceed requirements for this project.
I have indicated that the camera should preferably be greater than 3 Meg in resolution. My reasoning for this is as follows. For an A4 page size field of view, the pixels per inch are given by approximately 105 times the square root of the camera resolution in megapixels. For example a 4M camera would be 105 x 2 = 210 PPI. This is just a bit better than a fax machine, by the time you take into account a little noise and focus blur I don’t think a camera much less than ~3M (182 PPI) would work well enough. So forget about webcams and that cheap digicam you found in a show bag.
Nevertheless if you want a dedicated camera for the stand you should be able to pick up a cheap camera of sufficient quality from eBay. I know Samsung make several cameras with a text mode eg the S860. The S860 is quite cheap, but I have not tried it. I would welcome a bit of feedback about suitable cameras.
I used an old Panasonic FZ20, this has a 5M sensor providing images that are 2560 x 1920 pixels; so assuming an A4 page goes right across the image this gives a resolution of 1920/8.25” ~= 233 pixels/inch. I also have a Panasonic FZ50, this is a 10M camera and provides ~332 PPI on A4 paper. This extra resolution is occasionally a good thing but the files are much bigger too.
I have indicated that the camera should preferably be greater than 3 Meg in resolution. My reasoning for this is as follows. For an A4 page size field of view, the pixels per inch are given by approximately 105 times the square root of the camera resolution in megapixels. For example a 4M camera would be 105 x 2 = 210 PPI. This is just a bit better than a fax machine, by the time you take into account a little noise and focus blur I don’t think a camera much less than ~3M (182 PPI) would work well enough. So forget about webcams and that cheap digicam you found in a show bag.
Nevertheless if you want a dedicated camera for the stand you should be able to pick up a cheap camera of sufficient quality from eBay. I know Samsung make several cameras with a text mode eg the S860. The S860 is quite cheap, but I have not tried it. I would welcome a bit of feedback about suitable cameras.
I used an old Panasonic FZ20, this has a 5M sensor providing images that are 2560 x 1920 pixels; so assuming an A4 page goes right across the image this gives a resolution of 1920/8.25” ~= 233 pixels/inch. I also have a Panasonic FZ50, this is a 10M camera and provides ~332 PPI on A4 paper. This extra resolution is occasionally a good thing but the files are much bigger too.
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