User:Level zero/GSOC13/logs

Revision as of 09:49, 11 July 2013 by Level zero (talk | contribs) (week 4)

Development Logs

Project Details

Project Name Consolidating and Adding the Image Processing Functions to LIBICV
Project Sudent Mohit Daga
IRC(nick) zero_level
Google-Melange username zero_level
Phone Number +91 9783582684


This page will contain weekly targets and Updates about the work done.

From 1st to 5th June

Will be unavialable on the internet, Visiting the meditation facility.

  • Targets during this time
    • As per the proposal document I will be studying the Image Processing tools.
  • Read Details reagarding SVN.

5th June to 9th June

  • Read Codes of the utilitis from Group 1-8. Made Rough Notes for all theses utilities and working for an Implementation Plan.

10th June to 12th June

  • Api Design and Posting them on BRLCAD website. It can be accessed from here.

12th June - 14th June

  • Working on conversion tools. Posted a patch for conversion of pix-bw and bw-pix.Patch can be found [[1]].

Week 1 (17-22 June)

  • Structure Definitions : This week structure and api defintions were designed. had good discussions with the mentors on the possibility of the design and finalizing it.
  • Later during the end of week I read about high defintion images. Familiarized myself with Openexr [2] image containers. Also about how bmp, png handles them. About
Depth Converters
  • Bw-pix, pix-bw : I converted these two utilities to functions. These were important because these can help convert a grey level image to a colour image and vice versa. Saved as patch.
  • Wrote Doxygen comments for ICV Header file. Committed by ``Erik
  • Revisited my pre-application ICV_LOAD patches. Improved them and posted. Waiting to be reviewed. (Patch 197).
Cropping Functions
  • Although Groups start from the second week. During Discussions with the mentors, I implemented functionalities of Group 1. icv_rect (cropping with rectangular box.) and icv_crop(cropping with skewed cordinates). Although these have to be remodified with the new structure defintions.
  • I found a code redundancy while reading the utilities last week. Thus posted it. The mentors found issues with the compatibility of bwhisteq and its corectness. I checked and tested it on artificially uniform grad images, two clour images with half dark and half light and natural images of lena, barbara. Turns out that this is fine.

P.S. From next week onwards I will update on daily basis.


24th June

Worked on Operations(GROUP 2). Learnt the macro usage of vmath.h. This provides nice macro defintions. Although these cannot be used for image data. Designed new macro definitions for icv_data. Initiated a discussion for keeping them in icv_math.h

25th June

  • Tested three different structure dfintions for the time. These are here [3] [4] [5]
  • checked the Crop, and rect as per the new struct defintion
  • Find out a plan to implement these structure on the existing use of a libicv in rt,libged and rmrt

26th and 27th June

  • Wrote Functions to read, write, create Image and zero image.
  • Separate files have been made for each format. Added pix, bw format.
  • Links to these files are as follows
  • Road ahead:- Incorporate them in rt/view.c rt/viewxray.c rt/viewedge.c and rt/do.c and libged/screengrab.c

28th June

  • Converted the existing use of LIBICV in rt.
  • Added gamma_corr field in image for gamma correction when an image's data is converted from double to unisgned char type.

29th June

  • didnt do any coding work today.
  • worked towards clarifying issues with my patches 171, 175, 176, 178,188,192,197,198, 201.

30th June

  • did some system Cleaning and Installed new operating System and packages.


1 July

  • Did code regarding Filter Functions (Group 3) and use of Kernels.

2 July

  • Improved the kernel functions. tried building a test function in the src/util folder.

3 July

  • Instead of going further with Designing new functions. reitrated the use of icv functions in libged/screengrab.c Changed there functions as per the new writepixel functions. Tested load, save functions of icv library.

4 July

  • Wrote testing function and programms similar to libbu. These will help in testing the functions of icv. Also changed current usage of libicv in rt, rmrt and libged.

5 July

  • Wrote Color_space changers. This will be useful in saving RGB data in bw format and gray data in pix format.

6 July=

  • Wrote crop and rect functions for icv library. Crop accepts skewed parameters and can extract image in any quadraletral, this then converts the image to rectangular using the nearest neighbour. Whereas rect extracts rectangular part of an image.

Milestonses Reached

The following milestones only include the completed code. Kernels and operations have been started but are yet to completed, thus not included in the milestone.

  1. Discussed with mentors about the image structures and API designs.
  2. Wrote save functions in new format. Implemented the following functions as per the new formats.
    1. create_image,
    2. load_image,
    3. zero_image,
    4. free_image,
    5. write_pixel,
    6. write_line
  3. Initiated a testing infrastructure for libicv. Wrote testing functions for loading and saving images.
  4. converted the existing use of ICV in rt,libged and rmrt.
  5. Implemented functions to crop image These include
    1. Rect
    2. Crop
  6. Implemented functions to change Color_space
    1. rgb2gray
    2. gray2rgb

This link takes you to the new ICV infrastructure written

Week 4

Monday (8th July)

Implemented testing routines in libicv/tests for color_space(rgb2gray and gray2rgb), pixel writting(single pixel, and pixel line). Corrected few errors in the routines. Tested color space changers with natural image(lena of 512X512 in png format). Converted that to pix(png2pix). Loaded pix image using implemented function. and converted it to gray scale image, then saved to bw format. Used this bw image to create a pix image using colorspace chage to rgb. P.S. All these things are done by loading the image in double format data

Tuesday (9th July)

Implemented and tested spliting of color channels. Given a rgb image this function can split the any color channel and produce a gray scale image.