ejs » MatLAB http://ejs.seniejitrakai.net a snaphot of time Tue, 15 Jun 2010 23:06:06 +0000 en hourly 1 http://wordpress.org/?v=3.0 Colorization http://ejs.seniejitrakai.net/2005/10/19/colorization/ http://ejs.seniejitrakai.net/2005/10/19/colorization/#comments Wed, 19 Oct 2005 18:57:50 +0000 ejs http://ejs.seniejitrakai.net/?p=10 505510

Quite interesting article on image processing. The MatLAB source, presented on the site, need some minor enhancments. Authors may contact me, if they want ;) .
Attention: the program is really slow. I used ‘direct solver’, and it took almost 10 minutes to proceed the image.

]]> http://ejs.seniejitrakai.net/2005/10/19/colorization/feed/ 0 JPEG-2000 in MatLAB http://ejs.seniejitrakai.net/2005/04/16/jpeg-2000-in-matlab/ http://ejs.seniejitrakai.net/2005/04/16/jpeg-2000-in-matlab/#comments Fri, 15 Apr 2005 22:07:45 +0000 ejs http://ejs.seniejitrakai.net/?p=4 JP2 file in MatLAB?]]> Any idea how to produce and read the JP2 file in MatLAB?
The easiest way should be writing middleware in Java to specific library. The things are complicated, as i need to get and modify data from every stage of encoding/decoding, like color space transformations, quantization, EBCOT (including bit-plane decomposition, bit-plane processing, encoding) and rate-encoders.

  • There is JasPer, written in C. Not all functions of Jpeg-2000 basic specification is implemented now;
  • Jj2000, written in Java; only basic functionality is provided;
  • Kakadu, written in C++ and has JNI bindings. Almost perfect inplementation of the Jpeg2000 image compression standart; data-on-demand, progressive transmision, even video encoding/decoding is supported.

As i tried to reproduce kdu_encoder in Java, no image is appearing in the output file, while original C++ file works well.

Need more timeto research.

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