mirror of https://github.com/opencv/opencv.git
Alexander Alekhin
6 years ago
commit
7fb70e1701
20 changed files with 397 additions and 73 deletions
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# Import required modules |
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import cv2 as cv |
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import math |
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import argparse |
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|
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############ Add argument parser for command line arguments ############ |
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parser = argparse.ArgumentParser(description='Use this script to run TensorFlow implementation (https://github.com/argman/EAST) of EAST: An Efficient and Accurate Scene Text Detector (https://arxiv.org/abs/1704.03155v2)') |
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parser.add_argument('--input', help='Path to input image or video file. Skip this argument to capture frames from a camera.') |
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parser.add_argument('--model', required=True, |
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help='Path to a binary .pb file of model contains trained weights.') |
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parser.add_argument('--width', type=int, default=320, |
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help='Preprocess input image by resizing to a specific width. It should be multiple by 32.') |
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parser.add_argument('--height',type=int, default=320, |
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help='Preprocess input image by resizing to a specific height. It should be multiple by 32.') |
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parser.add_argument('--thr',type=float, default=0.5, |
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help='Confidence threshold.') |
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parser.add_argument('--nms',type=float, default=0.4, |
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help='Non-maximum suppression threshold.') |
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args = parser.parse_args() |
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|
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############ Utility functions ############ |
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def decode(scores, geometry, scoreThresh): |
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detections = [] |
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confidences = [] |
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|
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############ CHECK DIMENSIONS AND SHAPES OF geometry AND scores ############ |
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assert len(scores.shape) == 4, "Incorrect dimensions of scores" |
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assert len(geometry.shape) == 4, "Incorrect dimensions of geometry" |
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assert scores.shape[0] == 1, "Invalid dimensions of scores" |
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assert geometry.shape[0] == 1, "Invalid dimensions of geometry" |
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assert scores.shape[1] == 1, "Invalid dimensions of scores" |
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assert geometry.shape[1] == 5, "Invalid dimensions of geometry" |
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assert scores.shape[2] == geometry.shape[2], "Invalid dimensions of scores and geometry" |
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assert scores.shape[3] == geometry.shape[3], "Invalid dimensions of scores and geometry" |
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height = scores.shape[2] |
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width = scores.shape[3] |
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for y in range(0, height): |
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|
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# Extract data from scores |
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scoresData = scores[0][0][y] |
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x0_data = geometry[0][0][y] |
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x1_data = geometry[0][1][y] |
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x2_data = geometry[0][2][y] |
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x3_data = geometry[0][3][y] |
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anglesData = geometry[0][4][y] |
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for x in range(0, width): |
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score = scoresData[x] |
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|
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# If score is lower than threshold score, move to next x |
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if(score < scoreThresh): |
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continue |
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|
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# Calculate offset |
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offsetX = x * 4.0 |
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offsetY = y * 4.0 |
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angle = anglesData[x] |
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|
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# Calculate cos and sin of angle |
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cosA = math.cos(angle) |
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sinA = math.sin(angle) |
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h = x0_data[x] + x2_data[x] |
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w = x1_data[x] + x3_data[x] |
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|
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# Calculate offset |
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offset = ([offsetX + cosA * x1_data[x] + sinA * x2_data[x], offsetY - sinA * x1_data[x] + cosA * x2_data[x]]) |
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|
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# Find points for rectangle |
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p1 = (-sinA * h + offset[0], -cosA * h + offset[1]) |
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p3 = (-cosA * w + offset[0], sinA * w + offset[1]) |
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center = (0.5*(p1[0]+p3[0]), 0.5*(p1[1]+p3[1])) |
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detections.append((center, (w,h), -1*angle * 180.0 / math.pi)) |
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confidences.append(float(score)) |
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|
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# Return detections and confidences |
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return [detections, confidences] |
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|
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def main(): |
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# Read and store arguments |
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confThreshold = args.thr |
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nmsThreshold = args.nms |
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inpWidth = args.width |
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inpHeight = args.height |
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model = args.model |
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|
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# Load network |
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net = cv.dnn.readNet(model) |
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|
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# Create a new named window |
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kWinName = "EAST: An Efficient and Accurate Scene Text Detector" |
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cv.namedWindow(kWinName, cv.WINDOW_NORMAL) |
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outNames = [] |
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outNames.append("feature_fusion/Conv_7/Sigmoid") |
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outNames.append("feature_fusion/concat_3") |
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# Open a video file or an image file or a camera stream |
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cap = cv.VideoCapture(args.input if args.input else 0) |
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|
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while cv.waitKey(1) < 0: |
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# Read frame |
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hasFrame, frame = cap.read() |
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if not hasFrame: |
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cv.waitKey() |
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break |
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|
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# Get frame height and width |
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height_ = frame.shape[0] |
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width_ = frame.shape[1] |
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rW = width_ / float(inpWidth) |
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rH = height_ / float(inpHeight) |
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|
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# Create a 4D blob from frame. |
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blob = cv.dnn.blobFromImage(frame, 1.0, (inpWidth, inpHeight), (123.68, 116.78, 103.94), True, False) |
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|
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# Run the model |
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net.setInput(blob) |
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outs = net.forward(outNames) |
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t, _ = net.getPerfProfile() |
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label = 'Inference time: %.2f ms' % (t * 1000.0 / cv.getTickFrequency()) |
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# Get scores and geometry |
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scores = outs[0] |
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geometry = outs[1] |
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[boxes, confidences] = decode(scores, geometry, confThreshold) |
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|
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# Apply NMS |
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indices = cv.dnn.NMSBoxesRotated(boxes, confidences, confThreshold,nmsThreshold) |
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for i in indices: |
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# get 4 corners of the rotated rect |
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vertices = cv.boxPoints(boxes[i[0]]) |
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# scale the bounding box coordinates based on the respective ratios |
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for j in range(4): |
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vertices[j][0] *= rW |
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vertices[j][1] *= rH |
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for j in range(4): |
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p1 = (vertices[j][0], vertices[j][1]) |
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p2 = (vertices[(j + 1) % 4][0], vertices[(j + 1) % 4][1]) |
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cv.line(frame, p1, p2, (0, 255, 0), 1); |
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# Put efficiency information |
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cv.putText(frame, label, (0, 15), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0)) |
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# Display the frame |
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cv.imshow(kWinName,frame) |
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if __name__ == "__main__": |
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main() |
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