Procedure of Using Color Checker Node
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1. Link input image.
2. Define search region.
1. Define Color.
2.  


Define Region 
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	In color segmentation, node will consider all defined region as a single combined region.
	In color matching, node will match each defined region to the nearest color sample.
	
	There is 3 way for defining a region:

	1. Use Image Mask. 
		Input a Image Mask that has same size as Color Image.
		Node will define only one single region base on the mask.
	2. Define from mod finder node
		Input a Mod Finder Result comes from mod_finder node
		Select one model in Mod Finder Result.
		One region will be defined for each object found from mod_finder.
		Draw mask on model to define the color match region related to object
	3. Define from display
		Draw a rectangle box from main display
		Draw mask for this region


Color Sample 
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	The node will only match regions to defined color
	
	There are 2 ways to define a color sample

	1. Define color by area.
		Draw a box on display, node will calculate the average color of this box, and save it as color sample value. Additionally, you can draw/erase mask to change pixels included when calculate average.

	2. Define color by value
		Define a RGB value as color sample. The color can be set from a color board, manually set HSV or RGB value, or pick a pixel's color from the screen.