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.
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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.
I need to read images in HDF5 format in my c++ code. I googled and it seems I can use ITK. Could you please let me know if there is such a possibility?
PS1. HDF5 images are in *.h5 format.
PS2. I'm using ITK to read images like png and jpg formats.
Thanks in advance,
I believe you can use ITK to read it. A good way to check whether your image file format is supported by the ITK's reader is to try opening your image using Slicer. If the file opens correctly, you are good to go.
If not, ITK might still read it as Slicer essentially only cares about 2D, scalar 3D and some special vector 3D cases.
I have some images (in PNG and JPG format), stored as blobs in the database. I am retrieving them with a query and would like to take action by reading the metadata without writing the image to disk.
I am looking for the file type and image width.
You should be abe to convert the data to a ColdFusion Image type using the ImageNew function as documented here (set the source to be the variable you pulled out of the query).
Once you have the image, you can use the ImageInfo function to retrieve image properties.
This will give you the width. CF won't tell you the original file format, though--it might be easiest to look at magic numbers for that. Wikipedia gives a good summary of what those are and what the values for jpeg and png are: http://en.wikipedia.org/wiki/Magic_number_(programming)
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.
I want to do a texture mapping to a PPM file in C++. Is there some way I can load the PPM file. Thanks.
PPM is a trivial image file format to read; it's well documented here.
A few lines of C++ are all you need: example.