machinevisiontoolbox.Image.mono

Image.mono(opt='r601')

Convert color image to monochrome

Parameters:

opt (str, optional) – greyscale conversion mode, one of: ‘r601’ [default], ‘r709’, ‘value’ or ‘cv’

Returns:

monochrome image

Return type:

Image

Return a greyscale image of the same width and height as the color image. Various conversion options are available:

opt	definition
'r601'	ITU Rec. 601, Y’ = 0.229 R’ + 0.587 G’ + 0.114 B’
'r709'	ITU Rec. 709, Y’ = 0.2126 R’ + 0.7152 G’ + 0.0722 B’
'value'	V (value) component of HSV space
'cv'	OpenCV colorspace() RGB to gray conversion

Example:

>>> from machinevisiontoolbox import Image
>>> img = Image.Read('flowers1.png')
>>> img
Image: 640 x 426 (uint8), R:G:B [.../images/flowers1.png]
>>> img.mono()
Image: 640 x 426 (uint8)

Note:

For a monochrome image returns a reference to the Image instance.

References:

• Robotics, Vision & Control for Python, Section 10.2.7, P. Corke, Springer 2023.

Seealso:

colorspace colorize