In the US does the PDF417 format for identification cards store image/photo information in the barcode/magswipe tracks?
Can we extract that information if it is available?
The photo is going to take many kilobytes to have any decent resolution. A single PDF417 can hold a little over 1.5k. A magstripe even less.
There isn't a photo in either data store.
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So, here's the situation. I have direct access to two devices, and can take as many pictures as I want with each. Both devices are the same make and model, and do not save any metadata that would distinguish one from the other. This means that they do not leave any specific identifiers in the metadata. I also have a picture that I know came from one of them, but I don't know which. Let's call this photo "photoX". Both devices are the iPhone SE.
So here is the question: is there anything I can do with the two cameras and the pictures I can take with them to figure out which one photoX was taken from?
(Apparently I have to stress this, but metadata searching will not be able to work. I am aware of this.)
I'm trying to choose an API to match object images taken with a cell phone with a list of images in a file system. The point is, I'm afraid that I won't get reliable results and it won't be worth it to loose time in this feature.
I would really appreciate some advice regarding this topic.
I would like to capture road traffic data for a specific location and in a specific period and then I require to do some analysis on data. I try to check how I can do that. I found that I am able to use some public API for obtaining traffic information but I feel there could be other way as well. I require this data for a Big Data project.
Please suggest me how I should store data as well, I mean what is the best practice for store a big range of data of traffic.
Well, your question is very general! As I understand and based on my experience,
I suggest you something:
1- First and most efficient is that you can analysis your data online then extract your statistics and keep your results.
Easy for research here: http://www.mathworks.com/help/images/examples/detecting-cars-in-a-video-of-traffic.html
2- You can tag your data and keep only the sequences that you need, at least ignore a big unnecessary data automatically.
3- If you need to keep the video sequences for any reasons, then I suggest to use video compressors and decrease your videos not only by compressors also in terms of size.
http://video-compressor.en.softonic.com/
Is it possible to determine the physical location (e.g. angle + radius) for a particular bit on a CD/DVD/BluRay disk?
The reason I'm asking is this, I want to design a data structure which stores recovery information approximately on the opposite side of the medium to avoid a single scratch from making the whole exercise moot.
CD/DVD/BlueRay encoding schemes include code correction. This is basically another layer of data redundancy which allows the algorithm that decodes the disk to be able to not only detect errors but fix them. When the original engineers and computer scientists decided the encoding schemes for these disks they took scratch resistance into account.
See Reed Solomon codes which are used on CDs/DVDs/BluRay Disks
I want to develop a supermarket application for checking and billing.
Should I use barcodes or qrcodes? Which will give better accuracy?
The biggest difference here is that a linear barcode (e.g. Code 3 of 9, UPC, EAN, etc.) and a 2-dimensional symbology (e.g. QRCode, DataMatrix, etc.) store data in very different ways. A linear barcode can be read with a simple laser scanner, while most 2-D symbologies require an imager in order to be read. In general, imagers can also read linear barcodes, but are also more expensive than laser scanners.
You will want to consider whether your customers may already have linear scanners only, or whether they would be willing to pay the premium for an imager in order to get the benefit of the extra data that can be encoded in the 2-D symbologies.
Both will be accurate, the question is how much data do you need to store. QR has much more capacity than something like 3of9 barcode.