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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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i've problem with putting Grey scale image
i browse grey scale image but the program don't accept that ???!!!!
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i want to know how to make Image segmentation & edge detection
i want to make program that identify Signature
could u help me ????
modified 5-May-17 20:57pm.
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My image processing articles in C# show how to detect edges.
Christian
No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002
C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002
It'd probably be fairly easy to make a bot that'd post random stupid VB questions, and nobody would probably ever notice - benjymous - 21-Jan-2003
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public static Bitmap Wiener(Bitmap use)
{
Bitmap wien= new Bitmap(use.Height,use.Width);
int i,j,N;
uint tmp=0;
uint mM,M1,mVAR;
Are you kidding me?!?
modified 5-May-17 20:57pm.
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Since C# is a new language it is very difficult to find Image processing Library on this Platfrom
That's odd, seeing as I have 5 articles on this site which between them build a library for image processing in C#.
Christian
No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002
C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002
It'd probably be fairly easy to make a bot that'd post random stupid VB questions, and nobody would probably ever notice - benjymous - 21-Jan-2003
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Christian Graus wrote:
That's odd, seeing as I have 5 articles on this site which between them build a library for image processing in C#.
You know the problem with you CG, you lack visibility. Perhaps you should post more 
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
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You're right, perhaps I should give you my password. BTW I've been a bit quiet ( and about to be more so, losing DSL for three weeks ), are you top poster again yet ?
I had a glance through this code and it is *awful*.
Christian
No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002
C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002
It'd probably be fairly easy to make a bot that'd post random stupid VB questions, and nobody would probably ever notice - benjymous - 21-Jan-2003
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Christian Graus wrote:
are you top poster again yet ?
Nope. It actually feels nice at #2  No pressure. New people will only notice the #1 poster. The others in the top-10 will simply be others Now I hope to shed the stereotype image of a 24 hour posting bot I had for the last one year
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
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