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# This file is part of OpenCV Zoo project.
# It is subject to the license terms in the LICENSE file found in the same directory.
#
# Copyright (C) 2021, Shenzhen Institute of Artificial Intelligence and Robotics for Society, all rights reserved.
# Third party copyrights are property of their respective owners.
import argparse
import numpy as np
import cv2 as cv
from huggingface_hub import hf_hub_download
# Check OpenCV version
opencv_python_version = lambda str_version: tuple(map(int, (str_version.split("."))))
assert opencv_python_version(cv.__version__) >= opencv_python_version("4.10.0"), \
"Please install latest opencv-python for benchmark: python3 -m pip install --upgrade opencv-python"
from crnn import CRNN
from ppocr_det import PPOCRDet
text_detection_model_path = hf_hub_download(repo_id="opencv/text_detection_ppocr", filename="text_detection_en_ppocrv3_2023may.onnx")
# Valid combinations of backends and targets
backend_target_pairs = [
[cv.dnn.DNN_BACKEND_OPENCV, cv.dnn.DNN_TARGET_CPU],
[cv.dnn.DNN_BACKEND_CUDA, cv.dnn.DNN_TARGET_CUDA],
[cv.dnn.DNN_BACKEND_CUDA, cv.dnn.DNN_TARGET_CUDA_FP16],
[cv.dnn.DNN_BACKEND_TIMVX, cv.dnn.DNN_TARGET_NPU],
[cv.dnn.DNN_BACKEND_CANN, cv.dnn.DNN_TARGET_NPU]
]
parser = argparse.ArgumentParser(
description="An End-to-End Trainable Neural Network for Image-based Sequence Recognition and Its Application to Scene Text Recognition (https://arxiv.org/abs/1507.05717)")
parser.add_argument('--input', '-i', type=str,
help='Usage: Set path to the input image. Omit for using default camera.')
parser.add_argument('--model', '-m', type=str, default='text_recognition_CRNN_EN_2021sep.onnx',
help='Usage: Set model path, defaults to text_recognition_CRNN_EN_2021sep.onnx.')
parser.add_argument('--backend_target', '-bt', type=int, default=0,
help='''Choose one of the backend-target pair to run this demo:
{:d}: (default) OpenCV implementation + CPU,
{:d}: CUDA + GPU (CUDA),
{:d}: CUDA + GPU (CUDA FP16),
{:d}: TIM-VX + NPU,
{:d}: CANN + NPU
'''.format(*[x for x in range(len(backend_target_pairs))]))
parser.add_argument('--width', type=int, default=736,
help='Preprocess input image by resizing to a specific width. It should be multiple by 32.')
parser.add_argument('--height', type=int, default=736,
help='Preprocess input image by resizing to a specific height. It should be multiple by 32.')
parser.add_argument('--save', '-s', action='store_true',
help='Usage: Specify to save a file with results. Invalid in case of camera input.')
parser.add_argument('--vis', '-v', action='store_true',
help='Usage: Specify to open a new window to show results. Invalid in case of camera input.')
args = parser.parse_args()
def visualize(image, boxes, texts, color=(0, 255, 0), isClosed=True, thickness=2):
output = image.copy()
pts = np.array(boxes[0])
output = cv.polylines(output, pts, isClosed, color, thickness)
for box, text in zip(boxes[0], texts):
cv.putText(output, text, (box[1].astype(np.int32)), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255))
return output
if __name__ == '__main__':
backend_id = backend_target_pairs[args.backend_target][0]
target_id = backend_target_pairs[args.backend_target][1]
# Instantiate PPOCRDet for text detection
detector = PPOCRDet(modelPath=text_detection_model_path,
inputSize=[args.width, args.height],
binaryThreshold=0.3,
polygonThreshold=0.5,
maxCandidates=200,
unclipRatio=2.0,
backendId=backend_id,
targetId=target_id)
# Instantiate CRNN for text recognition
recognizer = CRNN(modelPath=args.model, backendId=backend_id, targetId=target_id)
# If input is an image
if args.input is not None:
original_image = cv.imread(args.input)
original_w = original_image.shape[1]
original_h = original_image.shape[0]
scaleHeight = original_h / args.height
scaleWidth = original_w / args.width
image = cv.resize(original_image, [args.width, args.height])
# Inference
results = detector.infer(image)
texts = []
for box, score in zip(results[0], results[1]):
texts.append(
recognizer.infer(image, box.reshape(8))
)
# Scale the results bounding box
for i in range(len(results[0])):
for j in range(4):
box = results[0][i][j]
results[0][i][j][0] = box[0] * scaleWidth
results[0][i][j][1] = box[1] * scaleHeight
# Draw results on the input image
original_image = visualize(original_image, results, texts)
# Save results if save is true
if args.save:
print('Results saved to result.jpg\n')
cv.imwrite('result.jpg', original_image)
# Visualize results in a new window
if args.vis:
cv.namedWindow(args.input, cv.WINDOW_AUTOSIZE)
cv.imshow(args.input, original_image)
cv.waitKey(0)
else: # Omit input to call default camera
deviceId = 0
cap = cv.VideoCapture(deviceId)
tm = cv.TickMeter()
while cv.waitKey(1) < 0:
hasFrame, original_image = cap.read()
if not hasFrame:
print('No frames grabbed!')
break
original_w = original_image.shape[1]
original_h = original_image.shape[0]
scaleHeight = original_h / args.height
scaleWidth = original_w / args.width
frame = cv.resize(original_image, [args.width, args.height])
# Inference of text detector
tm.start()
results = detector.infer(frame)
tm.stop()
cv.putText(frame, 'Latency - {}: {:.2f}'.format(detector.name, tm.getFPS()), (0, 15), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255))
tm.reset()
# Inference of text recognizer
if len(results[0]) and len(results[1]):
texts = []
tm.start()
for box, score in zip(results[0], results[1]):
result = np.hstack(
(box.reshape(8), score)
)
texts.append(
recognizer.infer(frame, box.reshape(8))
)
tm.stop()
cv.putText(frame, 'Latency - {}: {:.2f}'.format(recognizer.name, tm.getFPS()), (0, 30), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255))
tm.reset()
# Scale the results bounding box
for i in range(len(results[0])):
for j in range(4):
box = results[0][i][j]
results[0][i][j][0] = box[0] * scaleWidth
results[0][i][j][1] = box[1] * scaleHeight
# Draw results on the input image
original_image = visualize(original_image, results, texts)
print(texts)
# Visualize results in a new Window
cv.imshow('{} Demo'.format(recognizer.name), original_image)
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