GaussianBlur

Description

Apply Gaussian blur to the input image using a randomly sized kernel.

    This transform blurs the input image using a Gaussian filter with a random kernel size
    and sigma value. Gaussian blur is a widely used image processing technique that reduces
    image noise and detail, creating a smoothing effect.

    Args:
        blur_limit (tuple[int, int] | int): Controls the range of the Gaussian kernel size.
            - If a single int is provided, the kernel size will be randomly chosen
              between 0 and that value.
            - If a tuple of two ints is provided, it defines the inclusive range
              of possible kernel sizes.
            Must be zero or odd and in range [0, inf). If set to 0, it will be computed
            from sigma as `round(sigma * (3 if img.dtype == np.uint8 else 4) * 2 + 1) + 1`.
            Larger kernel sizes produce stronger blur effects.
            Default: (3, 7)

        sigma_limit (tuple[float, float] | float): Range for the Gaussian kernel standard
            deviation (sigma). Must be in range [0, inf).
            - If a single float is provided, sigma will be randomly chosen
              between 0 and that value.
            - If a tuple of two floats is provided, it defines the inclusive range
              of possible sigma values.
            If set to 0, sigma will be computed as `sigma = 0.3*((ksize-1)*0.5 - 1) + 0.8`.
            Larger sigma values produce stronger blur effects.
            Default: 0

        p (float): Probability of applying the transform. Should be in the range [0, 1].
            Default: 0.5

    Targets:
        image

    Image types:
        uint8, float32

    Number of channels:
        Any

    Note:
        - The relationship between kernel size and sigma affects the blur strength:
          larger kernel sizes allow for stronger blurring effects.
        - When both blur_limit and sigma_limit are set to ranges starting from 0,
          the blur_limit minimum is automatically set to 3 to ensure a valid kernel size.
        - For uint8 images, the computation might be faster than for floating-point images.

    Example:
        >>> import numpy as np
        >>> import albumentations as A
        >>> image = np.random.randint(0, 256, (100, 100, 3), dtype=np.uint8)
        >>> transform = A.GaussianBlur(blur_limit=(3, 7), sigma_limit=(0.1, 2), p=1)
        >>> result = transform(image=image)
        >>> blurred_image = result["image"]
    

Parameters

• blur_limit: int | tuple[int, int] (default: (3, 7))
• sigma_limit: int | tuple[int, int] | float | tuple[float, float] (default: 0)
• p: float (default: 0.5)

Targets

• Image