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dsdl.geometry.rotate_box

RBBox

Bases: BaseGeometry

Source code in /Users/bin/anaconda3/envs/dsdl/lib/python3.10/site-packages/dsdl/geometry/rotate_box.py 
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class RBBox(BaseGeometry):
    def __init__(self, value, mode="xywht", measure="radian"):
        """A Geometry class which abstracts a rotated bounding box object.

        Args:
            value: The value of the current rotated bounding box.
                   When the `mode` is `"xywht"`,
                   the format is [x, y, w, h, t], which are the bounding box's center point horizontal axis,
                   the bounding box's center point vertical axis, the bounding box's width the bounxing box's height,
                   and the bounding box's rotate angle (in radians).
                   Whe the `mode` is `"xyxy"`,
                   the format is `[[x1, y1], [x2, y2], [x3, y3], [x4, y4]]`, which represents the coordinates of the bounding box's four vertices.
            mode: The mode of the given `value`. Only `"xywht"` and `"xyxy"` are permitted.
        """
        assert mode in ("xywht", "xyxy") and measure in ("radian", "degree")
        if mode == "xywht":
            self._polygon = None
            if measure == "degree":
                value = value.copy()
                value[-1] = value[-1] / 180 * math.pi
            self._rbbox = value
        else:
            self._polygon = [value[i:i + 2] for i in (0, 2, 4, 6)]
            self._rbbox = None

    @staticmethod
    def rbbox2polygon(value):
        """Convert the `xywht` mode bounding box into `xyxy` mode.

        Args:
            value: The `xywht` mode bounding box's value.

        Returns:
            The coresponding `xyxy` mode bounding box's value.
        """
        x, y, width, height, angle = value
        cosA, sinA = math.cos(angle), math.sin(angle)

        def _rotate(p_):  # clockwise
            x_, y_ = p_
            x_r = (x_ - x) * cosA - (y_ - y) * sinA + x
            y_r = (x_ - x) * sinA + (y_ - y) * cosA + y
            return [x_r, y_r]

        x_l, x_r, y_t, y_b = x - width / 2, x + width / 2, y - height / 2, y + height / 2
        p_lt, p_lb, p_rt, p_rb = [x_l, y_t], [x_l, y_b], [x_r, y_t], [x_r, y_b]

        return [_rotate(p_lt), _rotate(p_lb), _rotate(p_rb), _rotate(p_rt)]

    def point_for_draw(self, mode: str = "lt"):
        """
        Get the point's coordinate where a legend is fit to draw.
        Args:
            mode: The position model. Only "lb", "lt", "rb", "rt" are permitted, which mean get the coordinate of left bottom,
                left top, right bottom and right top corresponding.

        Returns:
            The coordinate corresponding to the `mode`, whose format is [x, y].
        """
        assert mode in ("lb", "lt", "rb", "rt")
        if mode == "lt":
            p = min(self.polygon_value, key=lambda x: x[0] + x[1])
        elif mode == "lb":
            p = min(self.polygon_value, key=lambda x: x[0] - x[1])
        elif mode == "rt":
            p = min(self.polygon_value, key=lambda x: -x[0] + x[1])
        else:  # rb
            p = min(self.polygon_value, key=lambda x: -x[0] - x[1])
        p = [int(_) for _ in p]
        return p

    @staticmethod
    def polygon2rbbox(value):
        """Converted the `xyxy` mode bounding box into `xywht` mode.

        Args:
            value: The `xyxy` mode bounding box's value.

        Returns:
            The coresponding `xywht` mode bounding box's value.
        """
        res = cv2.minAreaRect(np.array(value).astype(np.int32))
        x, y = res[0]
        width, height = res[1]  # width is "first edge"
        angle = res[2]
        if width < height:
            width, height = height, width
            angle = angle + 90
        angle = 1 - angle / 180 * math.pi
        return [x, y, width, height, angle]

    @property
    def polygon_value(self):
        """Get the `xyxy` mode bounding box's value.

        Returns:
            The `xyxy` mode bounding box's value.
        """
        if self._polygon is None:
            self._polygon = self.rbbox2polygon(self._rbbox)
        return self._polygon

    @property
    def rbbox_value(self):
        """Get the `xywht` mode bounding box's value.

        Returns:
            The `xywht` mode bounding box's value.
        """
        if self._rbbox is None:
            self._rbbox = self.polygon2rbbox(self._polygon)
        return self._rbbox

    def visualize(self, image, palette, **kwargs):
        """Draw the current rotated bounding box on an given image.

        Args:
            image: The image where the rotated bounding box to be drawn.
            palette: The palette which stores the color of different category name.
            **kwargs: Other annotations which may be used when drawing the current bounding box, such as `Label` annotation.

        Returns:
            The image where the current rotated bounding box has been drawn on.
        """
        color = (0, 255, 0)
        if "label" in kwargs:
            for label in kwargs["label"].values():
                if label.category_name not in palette:
                    palette[label.category_name] = tuple(np.random.randint(0, 255, size=[3]))

                color = palette[label.category_name]

        poly = Image.new('RGBA', image.size[:2])
        pdraw = ImageDraw.Draw(poly)
        pdraw.polygon([tuple(_) for _ in self.polygon_value], fill=(*color, 127), outline=(*color, 255))
        image.paste(poly, mask=poly)
        del pdraw
        return image

    def __repr__(self):
        x, y, w, h, angle = self.rbbox_value
        x, y, w, h, angle = int(x), int(y), int(w), int(h), int(angle / math.pi * 180)
        return f"[{x}, {y}, {w}, {h}, {angle}°]"

polygon_value property

Get the xyxy mode bounding box's value.

Returns:

Type Description

The xyxy mode bounding box's value.

rbbox_value property

Get the xywht mode bounding box's value.

Returns:

Type Description

The xywht mode bounding box's value.

__init__(value, mode='xywht', measure='radian')

A Geometry class which abstracts a rotated bounding box object.

Parameters:

Name Type Description Default
value

The value of the current rotated bounding box. When the mode is "xywht", the format is [x, y, w, h, t], which are the bounding box's center point horizontal axis, the bounding box's center point vertical axis, the bounding box's width the bounxing box's height, and the bounding box's rotate angle (in radians). Whe the mode is "xyxy", the format is [[x1, y1], [x2, y2], [x3, y3], [x4, y4]], which represents the coordinates of the bounding box's four vertices.

 required
mode

The mode of the given value. Only "xywht" and "xyxy" are permitted.

 'xywht'
Source code in /Users/bin/anaconda3/envs/dsdl/lib/python3.10/site-packages/dsdl/geometry/rotate_box.py 
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def __init__(self, value, mode="xywht", measure="radian"):
    """A Geometry class which abstracts a rotated bounding box object.

    Args:
        value: The value of the current rotated bounding box.
               When the `mode` is `"xywht"`,
               the format is [x, y, w, h, t], which are the bounding box's center point horizontal axis,
               the bounding box's center point vertical axis, the bounding box's width the bounxing box's height,
               and the bounding box's rotate angle (in radians).
               Whe the `mode` is `"xyxy"`,
               the format is `[[x1, y1], [x2, y2], [x3, y3], [x4, y4]]`, which represents the coordinates of the bounding box's four vertices.
        mode: The mode of the given `value`. Only `"xywht"` and `"xyxy"` are permitted.
    """
    assert mode in ("xywht", "xyxy") and measure in ("radian", "degree")
    if mode == "xywht":
        self._polygon = None
        if measure == "degree":
            value = value.copy()
            value[-1] = value[-1] / 180 * math.pi
        self._rbbox = value
    else:
        self._polygon = [value[i:i + 2] for i in (0, 2, 4, 6)]
        self._rbbox = None

point_for_draw(mode='lt')

Get the point's coordinate where a legend is fit to draw.

Parameters:

Name Type Description Default
mode str

The position model. Only "lb", "lt", "rb", "rt" are permitted, which mean get the coordinate of left bottom, left top, right bottom and right top corresponding.

 'lt'

Returns:

Type Description

The coordinate corresponding to the mode, whose format is [x, y].
Source code in /Users/bin/anaconda3/envs/dsdl/lib/python3.10/site-packages/dsdl/geometry/rotate_box.py 
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def point_for_draw(self, mode: str = "lt"):
    """
    Get the point's coordinate where a legend is fit to draw.
    Args:
        mode: The position model. Only "lb", "lt", "rb", "rt" are permitted, which mean get the coordinate of left bottom,
            left top, right bottom and right top corresponding.

    Returns:
        The coordinate corresponding to the `mode`, whose format is [x, y].
    """
    assert mode in ("lb", "lt", "rb", "rt")
    if mode == "lt":
        p = min(self.polygon_value, key=lambda x: x[0] + x[1])
    elif mode == "lb":
        p = min(self.polygon_value, key=lambda x: x[0] - x[1])
    elif mode == "rt":
        p = min(self.polygon_value, key=lambda x: -x[0] + x[1])
    else:  # rb
        p = min(self.polygon_value, key=lambda x: -x[0] - x[1])
    p = [int(_) for _ in p]
    return p

polygon2rbbox(value) staticmethod

Converted the xyxy mode bounding box into xywht mode.

Parameters:

Name Type Description Default
value

The xyxy mode bounding box's value.

 required

Returns:

Type Description

The coresponding xywht mode bounding box's value.
Source code in /Users/bin/anaconda3/envs/dsdl/lib/python3.10/site-packages/dsdl/geometry/rotate_box.py 
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@staticmethod
def polygon2rbbox(value):
    """Converted the `xyxy` mode bounding box into `xywht` mode.

    Args:
        value: The `xyxy` mode bounding box's value.

    Returns:
        The coresponding `xywht` mode bounding box's value.
    """
    res = cv2.minAreaRect(np.array(value).astype(np.int32))
    x, y = res[0]
    width, height = res[1]  # width is "first edge"
    angle = res[2]
    if width < height:
        width, height = height, width
        angle = angle + 90
    angle = 1 - angle / 180 * math.pi
    return [x, y, width, height, angle]

rbbox2polygon(value) staticmethod

Convert the xywht mode bounding box into xyxy mode.

Parameters:

Name Type Description Default
value

The xywht mode bounding box's value.

 required

Returns:

Type Description

The coresponding xyxy mode bounding box's value.
Source code in /Users/bin/anaconda3/envs/dsdl/lib/python3.10/site-packages/dsdl/geometry/rotate_box.py 
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@staticmethod
def rbbox2polygon(value):
    """Convert the `xywht` mode bounding box into `xyxy` mode.

    Args:
        value: The `xywht` mode bounding box's value.

    Returns:
        The coresponding `xyxy` mode bounding box's value.
    """
    x, y, width, height, angle = value
    cosA, sinA = math.cos(angle), math.sin(angle)

    def _rotate(p_):  # clockwise
        x_, y_ = p_
        x_r = (x_ - x) * cosA - (y_ - y) * sinA + x
        y_r = (x_ - x) * sinA + (y_ - y) * cosA + y
        return [x_r, y_r]

    x_l, x_r, y_t, y_b = x - width / 2, x + width / 2, y - height / 2, y + height / 2
    p_lt, p_lb, p_rt, p_rb = [x_l, y_t], [x_l, y_b], [x_r, y_t], [x_r, y_b]

    return [_rotate(p_lt), _rotate(p_lb), _rotate(p_rb), _rotate(p_rt)]

visualize(image, palette, **kwargs)

Draw the current rotated bounding box on an given image.

Parameters:

Name Type Description Default
image

The image where the rotated bounding box to be drawn.

 required
palette

The palette which stores the color of different category name.

 required
**kwargs

Other annotations which may be used when drawing the current bounding box, such as Label annotation.

 {}

Returns:

Type Description

The image where the current rotated bounding box has been drawn on.
Source code in /Users/bin/anaconda3/envs/dsdl/lib/python3.10/site-packages/dsdl/geometry/rotate_box.py 
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def visualize(self, image, palette, **kwargs):
    """Draw the current rotated bounding box on an given image.

    Args:
        image: The image where the rotated bounding box to be drawn.
        palette: The palette which stores the color of different category name.
        **kwargs: Other annotations which may be used when drawing the current bounding box, such as `Label` annotation.

    Returns:
        The image where the current rotated bounding box has been drawn on.
    """
    color = (0, 255, 0)
    if "label" in kwargs:
        for label in kwargs["label"].values():
            if label.category_name not in palette:
                palette[label.category_name] = tuple(np.random.randint(0, 255, size=[3]))

            color = palette[label.category_name]

    poly = Image.new('RGBA', image.size[:2])
    pdraw = ImageDraw.Draw(poly)
    pdraw.polygon([tuple(_) for _ in self.polygon_value], fill=(*color, 127), outline=(*color, 255))
    image.paste(poly, mask=poly)
    del pdraw
    return image