def threshold_image(img, bkground_thresh, bkground_value=0.0):
    """
    Thresholds a given image at a value or percentile.

    Replacement value can be specified too.


    Parameters
    -----------
    image_in : ndarray
        Input image

    bkground_thresh : float
        a threshold value to identify the background

    bkground_value : float
        a value to fill the background elements with. Default 0.

    Returns
    -------

    thresholded_image : ndarray
        thresholded and/or filled image

    """

    if bkground_thresh is None:
        return img

    if isinstance(bkground_thresh, str):
        try:
            thresh_perc = float(bkground_thresh.replace('%', ''))
        except:
            raise ValueError(
                'percentile specified could not be parsed correctly '
                ' - must be a string of the form "5%", "10%" etc')
        else:
            thresh_value = np.percentile(img, thresh_perc)
    elif isinstance(bkground_thresh, (float, int)):
        thresh_value = bkground_thresh
    else:
        raise ValueError('Invalid specification for background threshold.')

    img[img < thresh_value] = bkground_value

    return img
def threshold_image ( img , bkground_thresh , bkground_value = 0.0 ) : if bkground_thresh is None : return img if isinstance ( bkground_thresh , str ) : try : thresh_perc = float ( bkground_thresh . replace ( '%' , '' ) ) except : raise ValueError ( 'percentile specified could not be parsed correctly ' ' - must be a string of the form "5%", "10%" etc' ) else : thresh_value = np . percentile ( img , thresh_perc ) elif isinstance ( bkground_thresh , ( float , int ) ) : thresh_value = bkground_thresh else : raise ValueError ( 'Invalid specification for background threshold.' ) img [ img < thresh_value ] = bkground_value return img
Thresholds a given image at a value or percentile.

    Replacement value can be specified too.


    Parameters
    -----------
    image_in : ndarray
        Input image

    bkground_thresh : float
        a threshold value to identify the background

    bkground_value : float
        a value to fill the background elements with. Default 0.

    Returns
    -------

    thresholded_image : ndarray
        thresholded and/or filled image