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lingo124

Image Analysis (get pixel color in RGB)

4 posts in this topic

#1 ·  Posted (edited)

I am trying to figure out a way to process images to single out a specific color. I have a camera that takes pictures of the ground from a r/c plane and need to find out a target in a patch, or sea, of green grass. The problem is, I don't know how to work with the pixelgetcolor thing. I tried converting it to hex but still no bueno because I need to have some sort of tolerance. For example, if the G in the RGB is maybe 2 digits greater I still want to categorize it as grass.

Does anybody know of a way to easily get the RGB value? I tried converting to hex and the converting to RGB using some shady function (dont remember if it was UDF). That didn't work out too well for me.

Thanks.

edit: It takes hundreds of pictures which is why I need to use automation. Plus I think autoit would probably be easier than using matlab.

Edited by lingo124

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"some shady function that didn't work out too well for me." is not quite the descriptive info which will get you the help you need really.

#include <Color.au3>
#include <Array.au3>

$colour = PixelGetColor(10,10)

$aRGB = _ColorGetRGB($colour)

_ArrayDisplay($aRGB)

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"some shady function that didn't work out too well for me." is not quite the descriptive info which will get you the help you need really.

#include <Color.au3>
#include <Array.au3>

$colour = PixelGetColor(10,10)

$aRGB = _ColorGetRGB($colour)

_ArrayDisplay($aRGB)

LOL wait I take that back. I was using _ColorGetRGB. I just assumed it was UDF cause the function was proceeded with an underscore. 

I did try that function using the example from the help page of ColorGetRGB as a basis. However, in the parameters it specified that the parameter was "The RGB color to work with (0x00RRGGBB)." Which made no sense to me since I am trying to get the RGB values. So I tried plugging in the hex of PixelGetColor to no avail. 

Does the _ColorGetRGB take the decimal representation of color? Because in the example code on that page it shows

#include <Color.au3>

Local $nColor = 0x8090ff

Local $aColor = _ColorGetRGB($nColor)
MsgBox(4096, "AutoIt", "Color=" & Hex($nColor) & @CRLF & " Red=" & Hex($aColor[0], 2) & " Blue=" & Hex($aColor[1], 2) & " Green=" & Hex($aColor[2], 2))

In that example, the $nColor is not a decimal color at all, since decimal colors don't have letters in them as far as I know. Im confused.

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As far as AutoIt is concerned 0x8090FF and 8425727 are the same number, one is in base 16, the other is in base 10. You can use them interchangably.

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