Android :: How Can I Do Image Processing On JPEG Data
Apr 13, 2009
I am confused on how to implement image processing algorithm on JPEG data.I have set P.setpicturesize (640,480) so the camera.takepicture (null,null,Imagecapture callbck) returns the image data. Void onPictureTaken(byte[] data, Camera Camera) returns JPEG data, but(x = data.length), the value of x is less than 640*480 bytes.Please kindly let me know how can I start editing pixel information of the image and image comparison algorithms.
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Aug 14, 2009
I am developing an app in which i need the image in TIFF format.But in android u can convert your bitmap/image to only JPEG/png image. is there a way to convert JPEG/png file to TIFF format or is there any jar available to do so.
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Jun 23, 2009
I would like to save a preview frame as a jpeg image.
I have tried to write the following code...
but it's not possible to open a saved file as a jpeg image. Does anyone know how to save preview frames as jpeg images?
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Oct 15, 2011
I want to perform various image processing functions such as threshold,equalize etc on the image i capture from the camera...What should i use in order to do that?
Also,when i installed the app in my phone, after clicking the pic, the next screen appears, and after clicking the button for performing other functions, force close comes up...what could be the reason,because my code works fine without the camera portion...
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Aug 23, 2009
I would appreciate to hear from you what would be the available options in Android to perform a lossless jpeg rotation of a jpeg image -> Rearranging the image data from landscape to portrait by rotation without ever fully decoding the image. My problem is that my device's camera always take the images in landscape mode and sometimes I would need to rotate the image to portrait to be used in my application. This takes time and memory if I need to do it in the standard way (decode the image, apply rotation operation to the pixels and encode again). Doing it without decoding the image would bring a significant improvement in performance. I have seen that in Android platform (Cupcake) jpegtran.c (which performs this operation beautifully) is available under /external/jpeg but this functionality is not available (a.f.a.k) on the application framework. How can I use this function? I guess I need to use JNI to be able to access this functionality, right? Other ways? Could you give me any hint on how I could do this or if there is another easier and quicker way to do it?
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Jan 11, 2010
I'm writing an application for Android. I need to make some image processing on the picture taken from camera.I use Camera.PictureCallback to get the photo, and I get picture in byte array.The problem is I want to make operations on every pixel of photo (some filtering and other stuff) so I guess, have photo in byte array is not a bad idea. But I don't know how interpret information in this byte array... The only way I know to make the processing is use BitmapFactory.decodeByteArray() and then use Bitmap object. Is this a good way to handle a lot of image processing?
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Aug 19, 2010
I am developing a mobile application that involves complex image processing operations. The app is designed in Java while the core image processing ops are implemented in native code, and compiled using the Android NDK.Now, I know that native code will *not* yield any significant performance improvement over Java code, and that the NDK purpose is only to support re-use of code libs (or to quickly integrate legacy code).are there any resources/tips-n-tricks/white papers/ samples on optimizing image processing algorithms for Android? To be even more specific, I am looking out for optimizing memory operations (cache misses, memory stalls, etc.). I profiled my application code and came to the conclusion that memory issues are causing the *maximum* performance penalty. (Nothing surprising over there, it is expected, but just verified with profile data as well).
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Sep 16, 2010
This is the sequence part of this question: http://stackoverflow.com/questions/3674441/combining-2-images-overlayed
so the problem is: if the image size is too big - it'll got an exception (out of memory exception)
what i want is, to handle even if the handset got the lower spec hardware, it doesn't go to that exception (but it'll take a longer time to process the image) is it possible to do that?
The code snippet is like this:
CODE:......
And that block of code is inside the async task.
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Sep 8, 2010
My app will have an SQLite database with some embedded JPEG images -- basically the binary contents of a JPEG file stored as a Blob in the database. Can someone point me in the general direction of where to start to figure out how to convert this "array of bytes" into a Bitmap object that can be further manipulated and displayed in an ImageView?
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Apr 10, 2009
I want to develop an app that lets one intercept raw audio data sent for playback (possibly by a different app), and apply audio enhancements over this raw data.Does Cupcake allow such filtering of audio data? If so, which API should I use? I understand this may not be possible at an application level for security reasons.I'm trying to see if this is possible with native code linking to public or private API of Android.
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Jun 23, 2010
1.myJpegFile = new File("images/jpegImage.jpg");
2.output = new BufferedOutputStream(new FileOutputStream(myJpegFile));
3.encoder = JPEGCodec.createJPEGEncoder(output);
4.encoder.encode(myJpegImage); Please could you give me the equivalent code for line no. 3 and 4 in Android?
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Oct 11, 2010
iam going to do some applications on mobile using image processing applications.i was asking which will be suitable for me as i will need a programming language that supports phonve devices with high memory, what is the maxiumm number of ram size that has been released to work on phone.is there any name about the phone that support high memory so i can buy it to help me in my work
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Sep 27, 2010
I am currently developing an image processing application for android mobile phones and I would like to know what libraries would you guys recommend me based on your experience.I have heard of JJIL but I do not know how good it might be for what i want to achieve.I need something that implements the basic image processing functions from Matlab toolbox, and i would also like to know if there are any alternatives to JJIL.Additionally, i have heard it is possible to use Matlab's compiler to generate C code that would be useable in a standalone application, but has anybody ever did this before, for Java, adapting it to work in android environment?
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Jun 14, 2010
Does Android have a native library that can make a jpeg from binary data from say, a json object?
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Apr 10, 2009
I am working on image processing in mobile. When Camera,takePicture(null,null,pictureCallback) called I am getting (640*480) JPEG image data, its taking 1 second delay.When I try to get raw data it returns null value.I am interested only on delay.
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May 25, 2009
Anybody is having the knowledge on porting of our own codec with replacing the Android one.
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Apr 30, 2010
I want to retrieve an image from my data/data/com.apps.myapp/images folder and display it in an ImageView. Any clue?
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Apr 14, 2010
I manage a project where users upload JPEG images for processing. Generally the images are taken with Nikon cameras, but recently one user took images with a Droid and the client software did not recognize the Droid JPEG images for upload. The client software developer said it's because they read images written in the standard JPEG file interchange format (JFIF), and Droid JPEGs are not in this format. Why, and can this be corrected?
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Aug 19, 2009
I am trying to save a bitmap in a JPEG format, and i can see that the image is always stored with a lower quality even if i give the compression level as 100, however for PNG it is working fine. Similarly during Media.insert() or getContentResolver().insert() the image is stored with a lesser quality, I can see in that the compression level is 50 in the Media.java, however I tried to create my own method for the same function with quality 100.
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Jan 18, 2010
I am developing one application which fetches the list of data/images from the server and shows on to the device. When I change the orientation, press Back button after doing it for 4-5 times app gets crashed. I am handling orientation change within activity itself and not setting the new view.
[Code]
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Jul 29, 2010
This is my code.
I got Http 400 error.
CODE:...................
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Oct 27, 2010
I am new to android development.currently i am facing a problem while inserting/retrieving image to sqlite database using android Code...
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Sep 17, 2010
I am a new to developing for Android and have been reading up and researching in order to become more familiar with the platform. My programming knowledge is moderate I have experience with C++ and a fairly proficient with Actionscript 3.0. I picked up programming primary to work on game development but come from a more artistic/design background.
I have a relatively simple idea for an app that I want to approach from the most practical way possible seeing how it's my first attempt. Essentially the core functionality of the app will be drawing information I will be getting from an ephemeris chart. At a certain time in the day which is based on the data from the chart I want to change an image/display information based on that day. I am trying to wrap my head around the best possible way to do this. Also I would like to give the user an option of having a notification of some kind when the change occurs, but that is something I have come across in terms of basic implementation.
So my question is if you were to approach setting something like this up how would you? What I am not sure about is setting up a time element so the application knows when to change the image/data to display.
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May 28, 2010
Can I have sub-folders to hold my drawable resources. For example can I store an image in, say, 'res/drawable/content/images/myimage.jpg' and then find that resource via a call to:
id = context.getResources().getIdentifier("com.mycompany.myprog:drawable/ content/images/myimage", null, null);
I have tried this and it doesn't seem to be working (but I may have something wrong). Is it supposed to work or do all the resources need to be in the root drawable folder? Also, are jpeg files supported and drawable resources?
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Aug 6, 2010
How can I convert from NV21 to JPEG. Currently, NV21 is the only previewFormat that is supported by the camera on a Nexus One (running Android 2.2).
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Jul 23, 2009
Android does not provide an Exif Reader or Exif Writer in its SDK (it has a native implemenation, though, but that API is private).
The Sanselan library, however, does provide a full fledged set of functionality for reading and writing Exif metadata.
However, Sanselan pur sang cannot be included in an Android Project. It references classes and packages that do not exist under the current version of Android (e.g. ImageIO).
Therefore, I made a quick cut of Sanselan 0.97, cutting out all the classes that prevent it from being used on the Android platform. It is a quick cut and it may have some issues. However, I got its exif reading and writing to work for my application and it looks like its working quite well. Reading and writing raw image-data is, however, not possible in this cut. This has been cut out.
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Feb 6, 2009
Is there a way to directly access a Jpeg's file metadata, without having to go through the ImageManager services?
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Dec 15, 2009
I want to know that android has a touchscreen requirement about hardware and software.And how does touch gesture processing where, for example, in driver layer or framework or application,
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Apr 23, 2010
I'm trying to write an XML parser that takes an RSS feed & fetches the image urls shown in the url attribute of the <media:thumbnail> tag. This is all being done via android.Util.Xml, & is an adaptation of the code shown here. An example RSS feed that I'm trying to use is the BBC News RSS feed. However, media is an additional namespace & (probably) as a result my parser isn't working as it should. A version of my parse method is below. Is there any (no doubt simple) way to get my list of image URLs working?
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Nov 8, 2010
Currently, I use a regular activity with some EditText fields as a registration screen in my application.The inputs are used to construct a soap message which is posted to the registration server, with the response being parsed to do some configuration of the application.I'd like to change this to have the registration page load in a WebView instance, so that the registration process takes place on an external web page.This would make it easier to make changes to the registration process without having to deploy a new build, as it would just be a matter of changing the web page that is loaded in the WebView.The question is would there be any way for me to get the response that is sent back from my registration server to the client? From what I can tell, if I went this route, there wouldn't be a way for me to parse the response like I currently do to initialize the application settings.
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