2019-02-26 03:27:02 +01:00
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import numpy as np
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2019-06-02 14:29:50 +02:00
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import cv2
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2019-02-26 03:27:02 +01:00
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# convert shared memory array into numpy array
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def tonumpyarray(mp_arr):
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2019-06-02 14:29:50 +02:00
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return np.frombuffer(mp_arr.get_obj(), dtype=np.uint8)
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def draw_box_with_label(frame, x_min, y_min, x_max, y_max, label):
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color = (255,0,0)
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cv2.rectangle(frame, (x_min, y_min),
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(x_max, y_max),
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color, 2)
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font_scale = 0.5
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font = cv2.FONT_HERSHEY_SIMPLEX
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# get the width and height of the text box
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size = cv2.getTextSize(label, font, fontScale=font_scale, thickness=2)
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text_width = size[0][0]
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text_height = size[0][1]
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line_height = text_height + size[1]
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# set the text start position
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text_offset_x = x_min
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text_offset_y = 0 if y_min < line_height else y_min - line_height
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# make the coords of the box with a small padding of two pixels
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textbox_coords = ((text_offset_x, text_offset_y), (text_offset_x + text_width + 2, text_offset_y + line_height))
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cv2.rectangle(frame, textbox_coords[0], textbox_coords[1], color, cv2.FILLED)
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cv2.putText(frame, label, (text_offset_x, text_offset_y + line_height - 2), font, fontScale=font_scale, color=(0, 0, 0), thickness=2)
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