OpenCV Python: can not pass UMat to calcHist

edit

no cigar here, sorry. (how does it solve anything ? and there is no difference at all)

(but maybe we should try with a real image (like the opencv logo above, converted to gray))

@berak. Take alook at this lcv2.UMATt

yea, and it works fine with single UMat's. just not with arrays of it.

(which is the problem in the question, no ?)

@berak I don't understand " it works fine with single UMat's."

img = cv2.imread("c:/lib/opencv/samples/data/baboon.jpg")
b=cv2.UMat(img)
h1= cv2.calcHist(img, [0], None, [10], [0, 10])
h2=cv2.calcHist(b,[0],None,[10],[0,10])

Error :

Traceback (most recent call last):
  File "C:\Users\laurent\Documents\cours\TFcours\Python\ExemplePython\ChapitreIII\test.py", line 6, in <module>
    h2=cv2.calcHist(b,[0],None,[10],[0,10])
SystemError: <built-in function calcHist> returned NULL without setting an error

img = cv2.UMat(cv2.imread("c:/lib/opencv/samples/data/baboon.jpg"", cv2.IMREAD_COLOR))

@LBerger: x = cv2.cvtColor(cv2.UMat(y), cv2.COLOR_BG2GRAY) works fine, and returns another UMat.

the arrays are the problem

HOk result Ok hNotOk result is not OK ! :

img = cv.imread("g:/lib/opencv/samples/data/baboon.jpg")
b=cv.UMat(img)
xisUmat = cv.cvtColor(b, cv.COLOR_BGR2GRAY)
hOK= cv.calcHist(img, [0], None, [10], [0, 10])
hOK= cv.calcHist([img], [0], None, [10], [0, 10])
hnotOK=cv.calcHist(b,[0],None,[10],[0,10])

and my cv2.cpp is here

does anyone have build/modules/python_bindings_generator/pyopencv_generated_funcs.h around ? we'd need to take a look at the wrapper for calcHist there.

https://gist.github.com/LaurentBerger...

lol, all 25k locs of it ;) but thanks, a ton ;)

i see a vector_Mat here, where a vector_UMat would be required. so i think, there are 2 problems: gen2.py generates the wrong type, and there is no correct pyopencv_to() overload for vector_UMat