User:Level zero/proposal

Revision as of 23:30, 2 May 2013 by Level zero (talk | contribs) (Links to code and Tools to be used)

Personnel Information

Name Mohit Daga
Email Address
IRC(nick) zero_level
Phone Number +91 9783582684
Mailing Address E#221 Ram Path, Shyam Nagar, Jaipur – 302019.(IN)
Time Zone UTC +0530

Brief Background

I am an Undergraduate Student in Computer and Communication Engineering. Currently in my pre-final year, I have done diverse range of projects varying from Computer Systems, graphics, Image Processing and Learning.

Project Information

Project Title

Consolidating and Adding the Image Processing Functions to LIBICV

Brief summary of Project

BRL-CAD has a number of image processing tools. Currently all the tools are implemented in a modular fashion where in each tool is accessed as a module. The primitive task of this project is to combine the image processing functionalities of these tools to a library. This task will ensure the reusability of these functionalities by the application programmer through relevant api calls in the code and thus will be useful for building a proper GUI for BRL-CAD and helpful in other new tools/functions to be added to BRL-CAD in future.

Project Description (Detailed)


  • This project aims at consolidating the functionalities of the Image Processing Tool (IPT) (around 100 in number) under a library (already initiated as LIBICV in BRL-CAD).
  • Additionally this project will emphasize its focus on the usability of the image processing functions.

BRL-CAD’s IPT(s) Information and Current Status

Currently these tools are implemented as standalone applications where in each tool is a separate program and separate executable are compiled through these programs. To run any tool, currently we pass command line arguments to the executable file (separate for each tool) and the return arguments are received on standard output buffers or it could be done by saving the output at BRL-CAD’s IPT(s) are extensively written for various Image Processing task. Apart from the other formats, it has support for the BRL-CAD pioneered .pix format and the unix plots. Thus BRL-CAD cannot use any other third party library for Image Processing without altering them. Therefore work is underway in strengthening and Consolidating BRL-CAD’s image Processing Library and adding various Image Processing functionalities in it.

Consolidating IPT(s) under LIBICV

This is the primary task of this project wherein the image processing functionalities of the current tools are to be arranged and consolidated to a library lib_icv. It is possible to create our own library of function by writing the functions as subroutines and compiling them to link to a shared library.

Any api caller just needs to include the said library and thus has access to the implemented functions of image processing.

Among the current tools, image functions and there groups will be identified which could enhance the usability of the tools. Proper Documentation will be done as discussed in later sections.

Formats of Image to be supported

The current status of icv.h defines .PIX,.BW,.ALIAS,.BMP,.CI,.ORLE,.PNG,.PPM,.PS,.RLE,.SPM,.SUN,.YUV and looking at the conversion tools among the IPTs in src/util folder these seem to be the only relavant formats for BRLCAD. Very few formats among them are currently implemented for loading and saving of the images. This project will create functions for loading and saving of all these formats.

Categories of Image Processing Functions

On analyzing the current status of the IPTs they involve usage of the following categories of image processing functionalities. *Crop or Rect *Differences and other arithmetic operations *Filters, *Histograms and Equalizations *Rotate *Scale or Shrink *Stats *Thresh *Interpolate *Dimensions and Image Information *Background *Borders *Fading *Merge or Split *Saturation *Morphing

In this project, I propose to add these functionalities in the icv library. Further analysis will be done to identify other functionality. During the initial working stage details of these functions will be worked with to identify the input and output arguments, usability and different methods to be incorporated in the functions.


The current tools present in the /src/util include usage of most of the above mentioned functionalities and the image format. The implemnetation task will include extractings these functionalities, finding commong attributes to arrange them in common groups, improve usabiltiy and add multiple available methods.

Use of image containers and structures

The current structure for used in the icv library, for image details is as follows:

   struct icv_image_file {
   uint32_t magic;
   char *filename;
   int fd;
   int format;			/* ICV_IMAGE_* */
   int width, height, depth;	/* pixel, pixel, byte */
   unsigned char *data;
   unsigned long flags; 

}; Like any other image processing library there will be a need of containers to keep the points, arrays etc. No, judgement is made at this stage about these structures. In the working schedule special time is devoted for this purpose. On discussion with the mentors and other developers decision will be taken about deciding the image container and other structures needed for this library.

Sample Codes and Tools


For any library the documentation defines the way it will be used for the users. As per the current Doxygen Markups will be added to the This will include the input, output arguments. Details of the various methods in the functions.


  • A robust image processing library.
  • In Detail documentation of all the functions.

Working Schedule

upto June 17 (Analysis and Design Period)

  • Exploring the code.
  • Make a short rough bio about each tool - the way they work.
  • Find the Image Processing functionalities used in them. Look at duplication in the functionalities.
(5-10 tools/day depending on varied length.
  • Preparation of rough ideas of each functionalities and the way they will be implemented with additional improvements in usability.
  • Discuss with mentor and other developers about the final plan for the design of the library. This includes :
    • the possible formats to be supported (In addition to the already started in include/icv.h)
    • Addition of Different functionalities and there usability improvements.
    • Discussion about common groups identified for different functionalities.
  • Learning usage from BRLCAD libraries like common.h libbu libbio

At the end of this period : A finalized plan to proceed for the development of the library.

June 17 - Sep 2 (Development Phase)

June 17 - July 1 [~2 Week]

  • Implementation of various Structures of the new library
  • Deciding about the functions to be included in different files based on categories.
  • Deciding the input parameters and return type of each function.
  • Identify error handling in each Function.
  • Witting Documentation of all the structures included. PDF+Wiki
  • Creating Patches all together.

July 1 - July 15 [~2 Week]

  • Implimentation of Import/Export Modules.
  • Testing these Modules.
  • Documentation of these modules.

July 16 - Sep 2 [~7 Week]

  • Implementation of image processing functionalities focussing on categories mentioned in project description.
  • Enough Time is alloted to this to follow up the implemnetation as decided during analysis step.
  • Implementation of 3-4 functions a week which includes unit-level testing and code coverage.
  • Documentation of the functions including input output arguments/methods etc.

Sep 2 - Sep 27 (Final Wrap UP and Cleaning)

Sep 2 - Sep 9 [~1 Week]

  • Code Cleaning
  • System Level testing for the library.
  • Giving final structure to the documentation.

Sep9 - Sep16 [~1 Week]

  • Creating Demos For each functionality and Final cleaning

Sep 16 - Sep 27 [~1 Week]

  • Performance Analysis using gprof for different data.
  • Final code submission with Google.

Time Availability

  • During summer holidays I am completely free. I like working infront of screens.
  • I can devote 40-50 hrs/week .
  • Besides this I may have to take a weeks off for a meditation seminar and the dates are still not known. Even if this happens I have ability

work for late hours to complete work at hand.


In my final year at the university, I am due to work on my Under Graduate thesis. As per my background, my university has assigned me a faculty dealing in graphics and Image Processing. This motivates me to utilise my summer holidays working with BRLCAD due to their large codebase dealing with Image Processing and Graphics and thus becoming a regular contributor with it in my final year which would help me to complete my thesis.

Why you?

I am good in c, c++. I will not say that I possess excellent coding skills. But I have enough to work on this project. Besides this I am dedicated and have an inquisitiveness to learn new things.