Created
July 18, 2017 11:12
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Character segmentation to map out all the character regions
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import numpy as np | |
from skimage.transform import resize | |
from skimage import measure | |
from skimage.measure import regionprops | |
import matplotlib.patches as patches | |
import matplotlib.pyplot as plt | |
import cca2 | |
# on the image I'm using, the headlamps were categorized as a license plate | |
# because their shapes were similar | |
# for now I'll just use the plate_like_objects[2] since I know that's the | |
# license plate. We'll fix this later | |
# The invert was done so as to convert the black pixel to white pixel and vice versa | |
license_plate = np.invert(cca2.plate_like_objects[2]) | |
labelled_plate = measure.label(license_plate) | |
fig, ax1 = plt.subplots(1) | |
ax1.imshow(license_plate, cmap="gray") | |
# the next two lines is based on the assumptions that the width of | |
# a license plate should be between 5% and 15% of the license plate, | |
# and height should be between 35% and 60% | |
# this will eliminate some | |
character_dimensions = (0.35*license_plate.shape[0], 0.60*license_plate.shape[0], 0.05*license_plate.shape[1], 0.15*license_plate.shape[1]) | |
min_height, max_height, min_width, max_width = character_dimensions | |
characters = [] | |
counter=0 | |
column_list = [] | |
for regions in regionprops(labelled_plate): | |
y0, x0, y1, x1 = regions.bbox | |
region_height = y1 - y0 | |
region_width = x1 - x0 | |
if region_height > min_height and region_height < max_height and region_width > min_width and region_width < max_width: | |
roi = license_plate[y0:y1, x0:x1] | |
# draw a red bordered rectangle over the character. | |
rect_border = patches.Rectangle((x0, y0), x1 - x0, y1 - y0, edgecolor="red", | |
linewidth=2, fill=False) | |
ax1.add_patch(rect_border) | |
# resize the characters to 20X20 and then append each character into the characters list | |
resized_char = resize(roi, (20, 20)) | |
characters.append(resized_char) | |
# this is just to keep track of the arrangement of the characters | |
column_list.append(x0) | |
plt.show() |
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Bonjour,
ModuleNotFoundError: No module named 'cca2'
Merci