OpenCV Python: can not pass UMat to calcHist
everyone!
I'm trying to pass cv2.UMat object to cv2.calcHist function:
a = np.arange(10, dtype=np.uint8)
b = cv2.UMat(a)
cv2.calcHist([b], [0], None, [10], [0, 10])
and I'm getting the error
TypeError: images is not a numpy array, neither a scalar
but it seems like cpp version of OpenCV allows using UMat as source image.
Is it me doing something wrong or python OpenCV doesn't allow using UMat as source image for calcHist?
python opencv
asked Nov 13 '18 at 8:46
Daniel SakhapovDaniel Sakhapov
12
add a comment |
everyone!
I'm trying to pass cv2.UMat object to cv2.calcHist function:
a = np.arange(10, dtype=np.uint8)
b = cv2.UMat(a)
cv2.calcHist([b], [0], None, [10], [0, 10])
and I'm getting the error
TypeError: images is not a numpy array, neither a scalar
but it seems like cpp version of OpenCV allows using UMat as source image.
Is it me doing something wrong or python OpenCV doesn't allow using UMat as source image for calcHist?
python opencv
asked Nov 13 '18 at 8:46
Daniel SakhapovDaniel Sakhapov
12
add a comment |
everyone!
I'm trying to pass cv2.UMat object to cv2.calcHist function:
a = np.arange(10, dtype=np.uint8)
b = cv2.UMat(a)
cv2.calcHist([b], [0], None, [10], [0, 10])
and I'm getting the error
TypeError: images is not a numpy array, neither a scalar
but it seems like cpp version of OpenCV allows using UMat as source image.
Is it me doing something wrong or python OpenCV doesn't allow using UMat as source image for calcHist?
python opencv
asked Nov 13 '18 at 8:46
Daniel SakhapovDaniel Sakhapov
12
everyone!
I'm trying to pass cv2.UMat object to cv2.calcHist function:
a = np.arange(10, dtype=np.uint8)
b = cv2.UMat(a)
cv2.calcHist([b], [0], None, [10], [0, 10])
and I'm getting the error
TypeError: images is not a numpy array, neither a scalar
but it seems like cpp version of OpenCV allows using UMat as source image.
Is it me doing something wrong or python OpenCV doesn't allow using UMat as source image for calcHist?
python opencv
python opencv
asked Nov 13 '18 at 8:46
Daniel SakhapovDaniel Sakhapov
12
asked Nov 13 '18 at 8:46
Daniel SakhapovDaniel Sakhapov
12
edited Nov 13 '18 at 8:51
Daniel Sakhapov
asked Nov 13 '18 at 8:46
Daniel SakhapovDaniel Sakhapov
12
asked Nov 13 '18 at 8:46
Daniel SakhapovDaniel Sakhapov
12
asked Nov 13 '18 at 8:46
Daniel SakhapovDaniel Sakhapov
12
12
add a comment |
add a comment |
1 Answer
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IU guess the reason for that error can be found in the documentation of decode from pyzbar:
def decode(image, symbols=None, scan_locations=False):
"""Decodes datamatrix barcodes in `image`.
Args:
image: `numpy.ndarray`, `PIL.Image` or tuple (pixels, width, height)
symbols (ZBarSymbol): the symbol types to decode; if `None`, uses
`zbar`'s default behaviour, which is to decode all symbol types.
scan_locations (bool): If `True`, results will include scan
locations.
Decode expects an image or a matrix containing the data in a specific order, which is fullfilled by a mat-instance supported by OpenCV. The UMat-format does not fullfil this requirement and so the error will be occur.
answered Nov 13 '18 at 8:52
omair issaomair issa
14
thanks for answering, but what does pyzbar.decode have in common with cv2.calcHist?
– Daniel Sakhapov
Nov 13 '18 at 8:57
i think this is help you madebyollin.github.io/opencv-python-docs
– omair issa
Nov 13 '18 at 9:00
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
IU guess the reason for that error can be found in the documentation of decode from pyzbar:
def decode(image, symbols=None, scan_locations=False):
"""Decodes datamatrix barcodes in `image`.
Args:
image: `numpy.ndarray`, `PIL.Image` or tuple (pixels, width, height)
symbols (ZBarSymbol): the symbol types to decode; if `None`, uses
`zbar`'s default behaviour, which is to decode all symbol types.
scan_locations (bool): If `True`, results will include scan
locations.
Decode expects an image or a matrix containing the data in a specific order, which is fullfilled by a mat-instance supported by OpenCV. The UMat-format does not fullfil this requirement and so the error will be occur.
answered Nov 13 '18 at 8:52
omair issaomair issa
14
thanks for answering, but what does pyzbar.decode have in common with cv2.calcHist?
– Daniel Sakhapov
Nov 13 '18 at 8:57
i think this is help you madebyollin.github.io/opencv-python-docs
– omair issa
Nov 13 '18 at 9:00
add a comment |
IU guess the reason for that error can be found in the documentation of decode from pyzbar:
def decode(image, symbols=None, scan_locations=False):
"""Decodes datamatrix barcodes in `image`.
Args:
image: `numpy.ndarray`, `PIL.Image` or tuple (pixels, width, height)
symbols (ZBarSymbol): the symbol types to decode; if `None`, uses
`zbar`'s default behaviour, which is to decode all symbol types.
scan_locations (bool): If `True`, results will include scan
locations.
Decode expects an image or a matrix containing the data in a specific order, which is fullfilled by a mat-instance supported by OpenCV. The UMat-format does not fullfil this requirement and so the error will be occur.
answered Nov 13 '18 at 8:52
omair issaomair issa
14
thanks for answering, but what does pyzbar.decode have in common with cv2.calcHist?
– Daniel Sakhapov
Nov 13 '18 at 8:57
i think this is help you madebyollin.github.io/opencv-python-docs
– omair issa
Nov 13 '18 at 9:00
add a comment |
IU guess the reason for that error can be found in the documentation of decode from pyzbar:
def decode(image, symbols=None, scan_locations=False):
"""Decodes datamatrix barcodes in `image`.
Args:
image: `numpy.ndarray`, `PIL.Image` or tuple (pixels, width, height)
symbols (ZBarSymbol): the symbol types to decode; if `None`, uses
`zbar`'s default behaviour, which is to decode all symbol types.
scan_locations (bool): If `True`, results will include scan
locations.
Decode expects an image or a matrix containing the data in a specific order, which is fullfilled by a mat-instance supported by OpenCV. The UMat-format does not fullfil this requirement and so the error will be occur.
answered Nov 13 '18 at 8:52
omair issaomair issa
14
IU guess the reason for that error can be found in the documentation of decode from pyzbar:
def decode(image, symbols=None, scan_locations=False):
"""Decodes datamatrix barcodes in `image`.
Args:
image: `numpy.ndarray`, `PIL.Image` or tuple (pixels, width, height)
symbols (ZBarSymbol): the symbol types to decode; if `None`, uses
`zbar`'s default behaviour, which is to decode all symbol types.
scan_locations (bool): If `True`, results will include scan
locations.
Decode expects an image or a matrix containing the data in a specific order, which is fullfilled by a mat-instance supported by OpenCV. The UMat-format does not fullfil this requirement and so the error will be occur.
answered Nov 13 '18 at 8:52
omair issaomair issa
14
answered Nov 13 '18 at 8:52
omair issaomair issa
14
answered Nov 13 '18 at 8:52
omair issaomair issa
14
answered Nov 13 '18 at 8:52
omair issaomair issa
14
14
thanks for answering, but what does pyzbar.decode have in common with cv2.calcHist?
– Daniel Sakhapov
Nov 13 '18 at 8:57
i think this is help you madebyollin.github.io/opencv-python-docs
– omair issa
Nov 13 '18 at 9:00
add a comment |
thanks for answering, but what does pyzbar.decode have in common with cv2.calcHist?
– Daniel Sakhapov
Nov 13 '18 at 8:57
i think this is help you madebyollin.github.io/opencv-python-docs
– omair issa
Nov 13 '18 at 9:00
thanks for answering, but what does pyzbar.decode have in common with cv2.calcHist?
– Daniel Sakhapov
Nov 13 '18 at 8:57
thanks for answering, but what does pyzbar.decode have in common with cv2.calcHist?
– Daniel Sakhapov
Nov 13 '18 at 8:57
i think this is help you madebyollin.github.io/opencv-python-docs
– omair issa
Nov 13 '18 at 9:00
i think this is help you madebyollin.github.io/opencv-python-docs
– omair issa
Nov 13 '18 at 9:00
add a comment |
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