I need to read 55 number of .raw file which kept in a single folder with 1024x1024 dimensions and 16 bit depth. The same should be displayed using vtk and qt or itk and qt.
You can construct a NRRD or MetaImage header to indicate metadata for this volume.
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I have converted an image sequences into .raw file for volume rendering purpose using ImageJ.
I have tried open the .raw file using text editor like notepad++, and try to look for the file structure but unfortunately, it has no header thus raw file and all the data is in binary format.
Thus, is there any way to convert the image sequence by writing out a tool in c++ as i cant managed to found .raw file specification for volume dataset.
In OpenGL you could read a BMP file and use it as texture.
I know how to read a BMP file in OPENGL.
I just want to know if is it the same thing with JPG or JPEG files? is OpenGL support those files?
OpenGL does not support BMP files. It just cares about raw image date as one-, two or threedimensional arrays of pixel data with up to 4 channels (and a set of different data types). OpenGL does not even know what a file is. And it can't load anything. If you need JPEG files, you have to load them via other means, like libjpeg or some higher level image loading libraries or some of the other image loading libraries.
Is there a way to do this using fread/fwrite? I have the exact coordinates of the rectangle from the image I want to crop.
Most image files are more complex than just an array of pixels. They often contain headers with metadata and compress the image data in some way.
Editing them is often done with some sort of library, such as Magick++. These libraries contain classes and functions for
opening image files and reading in the image data
Modifying the image data with built-in functions, such as cropping, scaling, etc.
Getting access to the raw image data (often exposed as an array of pixels) so the programmer can modify it in ways not provided by the library.
saving image files
I personally recommend you CImg, an "small, open source, C++ toolkit for image processing". All you have to do is to include a header file, download it from http://cimg.sourceforge.net/, load the image from the file using the CImg library and then use the crop function.
How can I "draw"\"merge" a png top of another png (background) using libpng, while keeping the alpha section of the png being drawn on top of the backhround png. There does not seem to be any tutorials or anything mentioned in the documentation about it.
libpng is a library for loading images stored in the PNG file format. It is not a library for blitting images, compositing images, or anything of that nature. libpng's basic job is to take a file or memory image and turn it into an array of color values. What you're talking about is very much out of scope for libpng.
If you want to do this, you will have to do the image composition yourself manually. Or use a library that can do image composition (cairo, etc).
I am using artoolkit to create an augmented reality based project.I can load vrml 3d objects in the video feed using openvrml.
Now I wanted to load a bitmap or any other image file like jpg,png etc file on the marker in the video feed.How do I go about achieving this?
The usual approach is using an overlay.
Just make a VRML 'model' consisting of a single quad with a texture corresponding to your image file. Your existing VRML machinery should take care of the rest.