Image.threshold_interactive#

Image.threshold_interactive(title: str | None = None, mode: str = 'binary', block: bool = False) → Any[source]#

Interactive thresholding

Parameters:

  • title (str, optional) – title for the window, defaults to None

  • mode (str, optional) – threshold display mode, one of 'binary' or 'tozero', defaults to 'binary'

  • block (bool, optional) – block execution while the interactive window is open, defaults to False

Raises:

  • ValueError – called for a color image

  • ValueError – unknown mode

Returns:

selected threshold value

Return type:

scalar

The image is displayed in a simple Matplotlib GUI along with the histogram and a slider for threshold value. Adjusting the slider changes the thresholded image view.

If mode='binary' the displayed image is:

\[\begin{split}Y_{u,v} = \left\{ \begin{array}{l} 1 \mbox{, if } X_{u,v} > t \\ 0 \mbox{, otherwise} \end{array} \right.\end{split}\]

If mode='tozero' the displayed image is:

\[\begin{split}Y_{u,v} = \left\{ \begin{array}{l} X_{u,v} \mbox{, if } X_{u,v} > t \\ 0 \mbox{, otherwise} \end{array} \right.\end{split}\]
References:
Seealso:

threshold threshold_adaptive otsu opencv.threshold