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104 lines
3.3 KiB
Python
104 lines
3.3 KiB
Python
import logging
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logger = logging.getLogger(__name__)
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def square_roi_coordinate(roi, max_width, max_height, best_effort=False):
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"""Given a region of interest, returns a square region of interest."""
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x1, y1, x2, y2 = roi
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x1, y1, x2, y2 = int(round(x1)), int(round(y1)), int(round(x2)), int(round(y2))
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roi_width = x2 - x1
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roi_height = y2 - y1
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if roi_width < roi_height:
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diff = roi_height - roi_width
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x1 -= int(round(diff / 2))
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x2 += roi_height - (x2 - x1)
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elif roi_height < roi_width:
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diff = roi_width - roi_height
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y1 -= int(round(diff / 2))
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y2 += roi_width - (y2 - y1)
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x1, y1, x2, y2 = move_roi_into_bounds(
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(x1, y1, x2, y2), max_width, max_height, force=best_effort
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)
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width = x2 - x1
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height = y2 - y1
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if not best_effort and width != height:
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msg = f"ROI is not square: {width}x{height}"
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raise RuntimeError(msg)
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return x1, y1, x2, y2
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def resize_roi_coordinates(
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roi, expansion_factor, max_width, max_height, expand_up=True
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):
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"""
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Resize a region of interest while staying within the bounds.
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setting expand_up to False will prevent the ROI from expanding upwards, which is useful when
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expanding something like a face roi to capture more of the person instead of empty space above them.
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"""
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x1, y1, x2, y2 = roi
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side_length_x = x2 - x1
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side_length_y = y2 - y1
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max_expansion_factor = min(max_height / side_length_y, max_width / side_length_x)
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expansion_factor = min(expansion_factor, max_expansion_factor)
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expansion_x = int(round(side_length_x * expansion_factor - side_length_x))
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expansion_x_a = int(round(expansion_x / 2))
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expansion_x_b = expansion_x - expansion_x_a
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x1 -= expansion_x_a
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x2 += expansion_x_b
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expansion_y = int(round(side_length_y * expansion_factor - side_length_y))
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if expand_up:
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expansion_y_a = int(round(expansion_y / 2))
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expansion_y_b = expansion_y - expansion_y_a
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y1 -= expansion_y_a
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y2 += expansion_y_b
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else:
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y2 += expansion_y
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x1, y1, x2, y2 = move_roi_into_bounds((x1, y1, x2, y2), max_width, max_height)
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return x1, y1, x2, y2
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class RoiNotInBoundsError(ValueError):
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"""Error raised when a ROI is not within the bounds of the image."""
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def move_roi_into_bounds(roi, max_width, max_height, force=False):
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"""Move a region of interest into the bounds of the image."""
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x1, y1, x2, y2 = roi
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# move the ROI within the image boundaries
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if x1 < 0:
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x2 -= x1
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x1 = 0
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if y1 < 0:
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y2 -= y1
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y1 = 0
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if x2 > max_width:
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x1 -= x2 - max_width
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x2 = max_width
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if y2 > max_height:
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y1 -= y2 - max_height
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y2 = max_height
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x1, y1, x2, y2 = int(round(x1)), int(round(y1)), int(round(x2)), int(round(y2))
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# Force ROI to fit within image boundaries (sacrificing size and aspect ratio of ROI)
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if force:
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x1 = max(0, x1)
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y1 = max(0, y1)
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x2 = min(max_width, x2)
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y2 = min(max_height, y2)
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if x1 < 0 or y1 < 0 or x2 > max_width or y2 > max_height:
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roi_width = x2 - x1
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roi_height = y2 - y1
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msg = f"Not possible to fit ROI into boundaries: {roi_width}x{roi_height} won't fit inside {max_width}x{max_height}"
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raise RoiNotInBoundsError(msg)
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return x1, y1, x2, y2
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