Digital Image Processing
Basic effects
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| Conversion from colors to gray level |
Simple
The simplest and faster way to grayscale.
Average of Red, Green and Blue chanels.
G = (R+G+B)/3
YUV
Using the 'Y' chanel, the luma component
(the brightness) of the picture
This methode gives more contrast than the average.
Y = (0,299*R) + (0,587*V) + (0,114*B)
| Conversion from colors to black and white (Based on a grayscale picture) |
Simple
Threshold at half a byte (127).
The simplest and faster way to make a black and white picture.
If IN>127 -> OUT=255
Else -> OUT=0
Random
Threshold at half a byte adding an error [108 , 148]
More useful for printing, but unusable for searching algorithms.
If IN> (107+Alea[0,40]) -> OUT=255
Else -> OUT=0
