image processing application..please help..urgent!

[Petersdon]

i am developing an image processing application in labview(version 8.2) where i have to compare certain patterns on two different images and compare and check whether the patterns are the same(something like signature recognition)...i am new to labview (started using it only a year ago)...what i would like to know is whether there exists any way to get information about the image in the form of pixels(i would like to convert a color image to gray scale format if possible).right now i trying to do this with jpeg images...i need to get the information in an array so that i can analyze it later...can i do the same withinage formats other than jpeg

thanks in advance.. !!!

[crelf]

Are you using NI-Vision or Vision Builder AI?

[Petersdon]

image processing application..please help..urgent!

i am using the labview software student version ....im not sure whether it has access to ni vision or the vision builder ai.....can't this be done without these.....

if absolutely essential,i can get the vision builder ai for a trial period of 30 days...my project anyway has to be completed within that time

[eaolson]

QUOTE(Petersdon @ Oct 8 2007, 05:10 AM)

i am developing an image processing application in labview(version 8.2) where i have to compare certain patterns on two different images and compare and check whether the patterns are the same(something like signature recognition)...i am new to labview (started using it only a year ago)...what i would like to know is whether there exists any way to get information about the image in the form of pixels(i would like to convert a color image to gray scale format if possible).right now i trying to do this with jpeg images...i need to get the information in an array so that i can analyze it later...can i do the same withinage formats other than jpeg

I don't know if the student version has the Picture VIs or not, but you can use Unflatten Pixmap to get a 2D array of pixels. If the image is 24-bit, each value of the array will be the color of the pixel. If it's 8-bit or less, the value in the array will be an index into the colors array, which contains the actual color.

There is no "correct" color -> grayscale conversion. The most commonly used one for photos is Y = 0.3*R + 0.59*G + 0.11*B, which emphasizes the information in the green channel.