Template matching returns values outside [-1, 1]

[stefanv]

from skimage import data, color
from skimage.feature import match_template

import numpy as np

haystack = color.rgb2gray(data.chelsea())
needle = haystack[:10, :10]

corr = match_template(haystack, needle)

print "Maximum correlation:", corr.max()
print "Location:", np.unravel_index(corr.argmax(), corr.shape)

Result:

Maximum correlation: 5.97078
Location: (244, 61)

[stefanv]

Closed by #847