tf.image.random_contrast

TensorFlow 1 version View source on GitHub

Adjust the contrast of an image or images by a random factor.

tf.image.random_contrast(
    image, lower, upper, seed=None
)

Equivalent to adjust_contrast() but uses a contrast_factor randomly picked in the interval [lower, upper].

Args:

  • image: An image tensor with 3 or more dimensions.
  • lower: float. Lower bound for the random contrast factor.
  • upper: float. Upper bound for the random contrast factor.
  • seed: A Python integer. Used to create a random seed. See tf.compat.v1.set_random_seed for behavior.

Usage Example:

x = [[[1.0, 2.0, 3.0], 
      [4.0, 5.0, 6.0]], 
    [[7.0, 8.0, 9.0], 
      [10.0, 11.0, 12.0]]] 
tf.image.random_contrast(x, 0.2, 0.5) 
<tf.Tensor: shape=(2, 2, 3), dtype=float32, numpy=...> 

Returns:

The contrast-adjusted image(s).

Raises:

  • ValueError: if upper <= lower or if lower < 0.