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recognize: skip tiny or bin-empty lines, too

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Robert Sachunsky 2022-08-19 12:14:36 +02:00
parent 395e43c074
commit 8c2e4ca76d
1 changed files with 11 additions and 3 deletions
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12
ocrd_calamari/recognize.py
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@ -97,14 +97,22 @@ class CalamariRecognize(Processor):
log.debug("Recognizing line '%s' in region '%s'", line.id, region.id) log.debug("Recognizing line '%s' in region '%s'", line.id, region.id)
line_image, line_coords = self.workspace.image_from_segment(line, region_image, region_coords, feature_selector=self.features) line_image, line_coords = self.workspace.image_from_segment(line, region_image, region_coords, feature_selector=self.features)
if ('binarized' not in line_coords['features'] and 'grayscale_normalized' not in line_coords['features'] and self.network_input_channels == 1): if ('binarized' not in line_coords['features'] and
'grayscale_normalized' not in line_coords['features'] and
self.network_input_channels == 1):
# We cannot use a feature selector for this since we don't # We cannot use a feature selector for this since we don't
# know whether the model expects (has been trained on) # know whether the model expects (has been trained on)
# binarized or grayscale images; but raw images are likely # binarized or grayscale images; but raw images are likely
# always inadequate: # always inadequate:
log.warning("Using raw image for line '%s' in region '%s'", line.id, region.id) log.warning("Using raw image for line '%s' in region '%s'", line.id, region.id)
line_image = line_image if all(line_image.size) else [[0]] if (not all(line_image.size) or
line_image.height <= 8 or line_image.width <= 8 or
'binarized' in line_coords['features'] and line_image.convert('1').getextrema()[0] == 255):
# empty size or too tiny or no foreground at all: skip
log.warning("Skipping empty line '%s' in region '%s'", line.id, region.id)
line_image_np = np.array([[0]], dtype=np.uint8)
else:
line_image_np = np.array(line_image, dtype=np.uint8) line_image_np = np.array(line_image, dtype=np.uint8)
line_images_np.append(line_image_np) line_images_np.append(line_image_np)
line_coordss.append(line_coords) line_coordss.append(line_coords)