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Read my image processing article for info on how to convert to greyscale, and to access pixels directly
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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hello kishore sahab
i m danyial and i have just completed my course work of BS and now i m doing my final project in image processing i have seen ur code and i m impressed i need ur help in image processing and so if u dont mind kindly send me ur email address so that i can easily contact u my email is listed below
danyial@gmail.com
danyial
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I am really impressed with the clarity of the code! You make it look so simple 
I am using VC# 2005 (express). It seems like all row and column arguments are mixed-up.
This results in exceptions being thrown whenever the column argument in a for-loop gets bigger than the number of rows. Any one else have this problem too?
Speder
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I want to classify an image into sub images to get the intensity mean value of each sub image.
But first I want to divide an image into subimages, please help me,
shakeel
Image Processing & Multimedia Lab.
computer Engi. dept.
pknu. korea
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Hi. I'm working on Image Precessing, i have to craete Signature Vrification System and I'd like to write in C#. My work is similiar to yours so we can to cooperate. I think that your library could help me a lot and in the future I can help to expand your library. I have some probelms with downloading file from web site. Could U send me this on my email ?? labelthc@o2.pl I hope that we will be in touch.
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hello everyone
i want to do a thumb recognition project in c# as a final project of my bachelors degree if anyone can guide me from where should i start?
from what should i start studying for a thumb recognition?
i would like to do a thumb recognition for a mobile phone using c# if someone can help me in that aspect.
Thanks
amman
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Hallo Kishor Aher,
I current do a project about fingerprint recognition. I see that you have some experience about that. I do enhancement,segmentation, binarization, extraction, and now matching. It looks like some of them did not work as I expect, especially about matching and enhancement. I hope you can give advices. My contact is via email : tlvphong@hotmail.com. I'm looking forward to hearing from you very soon.
Thanks in advance,
Phong Tran
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I am going to start this Project please help me which platform should be chosen. My aim is to detecting motion in an in door area. Which concepts are necessary, I dont have a road map of doing this project.
adilhayatkhan@hotmail.com
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Hi All, My name is James and I am doing a Biometrics based Project.
the Project I am doing is a Fingerprint
Recognition, At this moment I am working on the research side of Biometrics.
For the time being I have a Fingerprint Recognition scanner and have just installed Visual Studio.NET software, I expect to use Visual C# for my application, I
hope to integrate it with a Biometric SDK I hope to use SQL Server for the database to store Fingerprint Images or Data.
Fot the implementation I am a bit stuck or unclear about the whole thing. I was wondering if any one could guide me in the right lines or give me an idea of doing this Project in a different way.
regards
James
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Hi all,
Currently, I'm working on a project on "Fingerprint Recognition System". There's a third party dll containing a method:
compareImage(char* scanned, int sHeight, int sWidth, char* database, int dHeight, dWidth)
The first arugment that the method takes in is a char*(char array) of the pixel data of the bitmap object(fingerprint image). I am aware that a bitmap object consisits of 4 parts: the BITMAPHeader, BITMAPINFO, color platete table and the pixel data. Anyone have any idea on how to extract only the pixel data from the bitmap object?
Hope anyone out there could help. Your help will be greatly appreciated. Thank you!
Pasl
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I need to write more than 1 image in one binary file and then read them... and show as image in a form.
Does anyone knows how to do this?
Could you send me some saple code?
Thanks!
Mario
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I was trying to do image processing of 16 bits grey scale images. The bitmap can only handle 8 bits. How can I access the pixel data safely or unsafely from the Image object?
Many thanks,
GL
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Hello Everybody,
I want to change my 8 bit and 16 bit image to gray scale images. how to use pixelformat.format16bppGrayscale.
Prakash
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This may not be relevent to what as u have not given details of ur problem but check this convertion in order to convert any RGB image to grey scale u have a very simple solution as follow
step1 : take the RGB values seperatly for a pixel
step2 : Know take any of this value from RGB and assign it to other 2.
Like suppose R = 150 then R=G=B = 150
step3 : apply this new value to the pixel and the whole image turns Grey Scale
Kishorda
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>>step1 take the RGB values seperatly for a pixel
>>step2 : Know take any of this value from RGB and assign it to other 2.
>>like suppose R = 150 then R=G=B = 150
>>step3 : apply this new value to the pixel and the whole image turns Grey >>Scale
This won't likely give you the results you want. You'll end up with a grayscale image for sure - but it will only reflect the intensity of a single color channel. Areas of your picture that are heavily r, g, or b will be under-represented in the final image. For example - if you had a heavily blue image but chose to use the r channel for your conversion then you'd end up with a very black picture.
Better to average the channels or use the highest of the three - or some other sensible scheme.
-matt redmond
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The correct formula for getting a grayscale image of R,G,B values is to calculate the "distance" of the colors like:
GrayValue = Math.Sqrt((R*R+G*G+B*B)/3);
Then assign
R = GrayValue
G = GrayValue
B = GrayValue
Enjoy,
Smallhorse 
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Since the eye isn't equally sensitive to red, green and blue, it is not a simple matter of an average or distance calculation.
The correct balance is:
GrayValue = 0.299*red + 0.587*green + 0.114*blue;
/Morten Nielsen
http://www.iter.dk
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The eye perceives color channels differently. To convert RGB to grayscale, use
Gray = Red * 0.299 + Green * 0.587 + Blue * 0.114
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How to display this 8 bit grey bytes in c#?
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Did you land up getting this to work. Im trying to do the same thing w/o much luck.
-jbs
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<br />
public Bitmap Bytesto8BMP(ref byte[] buffer,int width,int height)<br />
{ <br />
PixelFormat pixelFormat = PixelFormat.Format8bppIndexed;<br />
Bitmap bmp = new Bitmap (width,height,pixelFormat);<br />
<br />
BitmapData bd = bmp.LockBits( new Rectangle( 0, 0, width, height),<br />
ImageLockMode.WriteOnly, pixelFormat );<br />
<br />
Marshal.Copy(buffer, 0, bd.Scan0, width*height*3 );<br />
bmp.UnlockBits( bd ); <br />
<br />
<br />
return bmp;<br />
}<br />
<br />
Try this and let me know ..I suspect there is a memory leak occured in this code ..
Thanks in advance if someone can point out that
cheers
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hello
i am working on a Image Processing project, i need algo/code on morphology,finding skeleton of a video camera image,Regional descriptors....
can anybody plz guid me
my email id is
prit_me@hotmail.com
VC++
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Mr Kishor
i am developing an application in VC++....i am using image procssing concepts....but need help...can i please have your direct email id.
on your homepage i see no link to contect you.
bye thanks.
my email id is notifypinky@rediffmail.com
VC++
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my id is kaher@celpro.com
Kishorda
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Hey there,
Did you recieve my email regarding the biometric project Im working on? Let me know. Talk to you soon.
ZiPPy
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