Error with net.forward() in OpenCV EAST text detector in pycharm

问题

I am trying EAST text detector in pycharm but there is an error at line. (scores, geometry) = net.forward(layerNames)

cv2.error: OpenCV(4.1.0) C:\projects\opencv-python\opencv\modules\dnn\src\layers\concat_layer.cpp:95: error: (-201:Incorrect size of input array) Inconsistent shape for ConcatLayer in function 'cv::dnn::ConcatLayerImpl::getMemoryShapes'

CODE:

print("[INFO] loading EAST text detector...")
name = 'Pictures/non crop/maths soln analysis 4_89.jpg'
image = cv2.imread(name, 1)
(H, W) = image.shape[:2]

set the new width and height and then determine the ratio in change for both the width and height

(newW, newH) = (375, 500)
rW = W / float(newW)
rH = H / float(newH)
# resize the image and grab the new image dimensions
image = cv2.resize(image, (newW, newH))
orig = image.copy()
(H, W) = image.shape[:2]
net = cv2.dnn.readNet("frozen_east_text_detection.pb")
layerNames = [
"feature_fusion/Conv_7/Sigmoid",
"feature_fusion/concat_3"]

construct a blob from the image and then perform a forward pass of the model to obtain the two output layer sets

blob = cv2.dnn.blobFromImage(image, 1.0, (W, H),
(123.68, 116.78, 103.94), swapRB=True, crop=False)
start = time.time()
net.setInput(blob)

ERROR at this line

(scores, geometry) = net.forward(layerNames)

回答1:

You are not resizing to a multiple of 32.

Important: The EAST text requires that your input image dimensions be multiples of 32, so if you choose to adjust your --width and --height values, make sure they are multiples of 32!

回答2:

Change this line

(newW, newH) = (375, 500)

to

(newW, newH) = (320,320)

回答3:

I'm getting the same error in OpenCV 4.1.1. I'm trying to run this. My image is 320x320.

# define the two output layer names for the EAST detector model that
# we are interested -- the first is the output probabilities and the
# second can be used to derive the bounding box coordinates of text
layerNames = [
    "feature_fusion/Conv_7/Sigmoid",
    "feature_fusion/concat_3"]
# load the pre-trained EAST text detector
print("[INFO] loading EAST text detector...")
net = cv.dnn.readNet(east_network)

# construct a blob from the image and then perform a forward pass of
# the model to obtain the two output layer sets
blob = cv.dnn.blobFromImage(image, 1.0, (W, H),
    (123.68, 116.78, 103.94), swapRB=True, crop=False)
start = time.time()
net.setInput(blob)
(scores, geometry) = net.forward(layerNames)
end = time.time()

# show timing information on text prediction
print("[INFO] text detection took {:.6f} seconds".format(end - start))

But when I run it I get the following error:

[INFO] loading EAST text detector...

---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-11-cb4226399d04> in <module>
     15 start = time.time()
     16 net.setInput(blob)
---> 17 (scores, geometry) = net.forward(layerNames)
     18 end = time.time()
     19 

error: OpenCV(4.1.1) /io/opencv/modules/dnn/src/layers/concat_layer.cpp:95: error: (-201:Incorrect size of input array) Inconsistent shape for ConcatLayer in function 'getMemoryShapes'

来源：https://stackoverflow.com/questions/55963892/error-with-net-forward-in-opencv-east-text-detector-in-pycharm