[Webinar] Streamline your web hosting managementRegister Today

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1306
  • Last Modified:

how to convert a jpeg file into a c++ matrix ?

hi, i need to convert a jpeg file into a c++ 2D matrix, with each value representing the pixel's greyscale value of the jpeg file. Please help ? Thank you in advance ! =P
0
Shifeng
Asked:
Shifeng
2 Solutions
 
skypalaeCommented:
what about http://www.smalleranimals.com/jpegfile.htm ?? is it suitable enough?
S.
0
 
JensUniwebCommented:
Unother alternative is http://www.ijg.org/. It's a widly spread library first made for for UNIX systems. But are now available on Windwos and other platforms to.
0
 
DanRollinsCommented:
Convert the JPG into a Bitmap (DIB Section).  Then you can access the pixel data:

    C++ Q&A: Displaying a JPG in your MFC Application -- MSDN Magazine, October 2001
    http://msdn.microsoft.com/msdnmag/issues/01/10/c/default.aspx
    http://msdn.microsoft.com/msdnmag/issues/01/10/c

    OleLoadPicture API call
    http://msdn.microsoft.com/library/en-us/com/htm/ofn_ol2z_0k4l.asp

    SAMPLE: How to Load and Display Graphics Files with LOADPIC.EXE
    http://support.microsoft.com/support/kb/articles/Q218/9/72.ASP

After you have converted it (in memory) and have an HBITMAP, I'll show you how to access the grayscale pixels as (X,Y) of a 2-D array.

-- Dan
0
 
migoEXCommented:
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Split between skypalae,  JensUniweb and DanRollins.

Please leave any comments here within the next four days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

migoEX
EE Cleanup Volunteer
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now