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Closed 10 years ago.
i want to build an app that recognizes hyperlinks and email addresses when i point out the camera at a paper or board which consists of lot of information along with hyperlinks and email addresses..anyway has anybody built such an app before or is it feasible? should i use augmented reality for this? what say?
Off the top of my head the basic algorithm that first comes to mind is (1) capture the image, (2) process it via OCR looking for the particular strings you want, and (3) do what you want to do.
A quick search for "OCR on smartphone" turned up this paper which discusses OCR on smartphones and mentions an library available from Google, so you might start to get an overview there:
http://www.cs.unc.edu/cms/publications/honors-theses-1/lian09.pdf
The scenario you are describing does not sound like AR in a pure sense as you are not really "tracking" anything in the real world, but rather taking a picture and then post processing that image.
Good luck.
Interesting idea. You will have to work with text recognition. For hyperlinks and email addresses you can create some rules for which specific features algorithm should look for("#","http://",..).
However text recognition(eventually text extraction with letter comparing in predefined font) is not easy. I don't really see how you would like to use AR. In fact this would be AR app, which would get such info from real world into digital form.
It would be great app but good luck :)
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Closed 9 years ago.
I have worked with Core Image, creating filters and stuff. Also I'm aware that Core Image has feature detection capability.
I have also worked a bit with OpenCV, but not on a mobile device. Used it for very basic purposes.
Core Image is a lot simpler than OpenCV in terms of coding, but I still see a lot of activity going on in the OpenCV community w.r.t iOS. I wanted to know some applications where OpenCV can be preferred over Core Image.
The main goal for Core image is to perform operations on images. As you mentioned in your question, you can create filters and modify images.
OpenCV however, has a far broader scope. As the name implies, it provides tools for all kinds of computer vision applications. It can be used for facial recognition, object recognition, 3D scanning, but also applying filters to images.
I have no idea what you mean by "require it to be used". As far as i'm concerned, every application requires to be used. There would be no point in writing an application if you are not using it.
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Closed 10 years ago.
I have a question related to uploading text and image to server with Corona Sdk. Would it be possible to accpmplish this in Corona and if yes, would it be possible to take a picture with the phone or select picture from album and then upload it to a server, with a text descreption? Please guide mé in the right direction :)
Thank you in advance :)
Yes, Corona SDK provides you the means to make HTTP POST requests (see Corona Docs: API > Libraries > network > request) which allows you to use POST requests for uploading text and images to a web server.
Although related to uploading images to Twitter, Vellum Interactive's blog post Post Images to Twitter With Corona SDK might prove really handy. Even if you take all the bits concerning the Twitter API out, it seems to have plenty of knowledge and code that you can apply to your case too.
For your latter question: with Corona SDK API reference: media.show() you can access the platform-specific implementation photo library or camera which should be what you're looking for. There are no off-the-shelf implementations of this though so you may need to prepare for a good bit of hacking. But if you're ready for it, the Corona SDK reference is quite good.
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Closed 9 years ago.
I am developing an app that allows users to post to walls/groups very much like facebook or a classic forum. I really like the way you can post a link on facebook and the link will be recognized as a video, pic, or other media and will automatically display. Its a great feature b/c it keeps users on facebook instead of leaving the site. On that note, I was looking to implement something similar for my the app I am developing. Are there any rails plugins/gems that do this kind of thing?
Yes, I know how to google and have done so. I realize that I could write regular expressions to scan the link and then take an according action. However, I am looking for an existing implementation to save a boat load of time.
Any and all input would be appreciated.
Existing implementations would probably be employing some form of regular expression, although another approach is using custom "Markdown" syntax or BB code to make the regular expression easier.
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Closed 11 years ago.
I am doing a project on motion estimation between two frames of a video sequence using Block Matching Algorithm and using SAD metrics. It involves computing SAD between each block of reference frame and each block of a candidate frame in window size to get the motion vector between the two frames.
I want to implement the same using Map Reduce. Splitting the frames in key-value pairs, but am not able to figure out the logic because everywhere I see I find the wordCount or query search problem which is not analogus to mine
I would also appreciate If you are able to provide me more Map Reduce examples.
Hadoop is being used in situations where computations can happen in parallel and using a single machine might take a lot of time for the processing. There is nothing stopping you using Hadoop for video processing. Check this and this for more information on where Hadoop can be used. Some of these are related to video processing.
Start with understanding the WordCount example and Hadoop in general. Run the example on Hadoop. And then work from there. Would also suggest to buy the Hadoop - The Definitive Guide book. Hadoop and its ecosystem is changing at a very fast pace and it's tough to keep up-to-date, but the book will definitely give you a start on Hadoop.
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Closed 11 years ago.
what are the best practices to process images in enterptices web applications.
I mean
storing
assign with entity
fast loading/caching
delayed / ajax loading
suitable format (png, jpeg)
on fly editing (resizing, compress)
free libs/helpers
image watermarking/copyrighting on fly
Especially, appreciated already production approaches!
As always, every project has their own requirements, restrictions and resources (The 3Rs). There is no 'super pattern' or 'one size fits all' method.
We cannot tell you how to implement you project as every project is different. It's up to you to use your skills/knowledge and experience to make informed decisions on implementation.
The 'best practice' is to individually research and learn each of the technologies/methods you have listed and gain the knowledge to know when to use them based on your projects requirements, restrictions and resources.
I use ImageMagickObject in my mvc projects. It can:
suitable format (png, jpeg)
on flyediting (resizing, compress)
freelibs/helpers image
watermarking/copyrighting on fly
fast loading/caching: may be memcached?
delayed / ajax loading: jquery is a good solution
assign with entity: Entity Framework can work with almost all databases
storing: hard question. all depend to the functionality