tf.image.random_contrast——tf2.1 Document

参考自tf2.1官方文档:
https://www.tensorflow.org/api_docs/python/tf/image/random_contrast

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Adjust the contrast of an image or images by a random factor.
该函数用于随机调整RGB图像的对比度。

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].

在区间[lower, upper]上随机选择contrast_factor，更改图片对比度。

Args:

• image: RGB image or images. Size of the last dimension must be 3.

• image: 单张RGB图片或多张RGB图片，最后一维必须为3
  
  

• lower: float. Lower bound for the random contrast factor.

• lower: 浮点数，指定随机contrast factor的下限
  
  

• upper: float. Upper bound for the random contrast factor.

• upper: 浮点数，指定随机contrast factor的上限

• seed: A Python integer. Used to create a random seed. See tf.compat.v1.set_random_seed for behavior.

• seed: Python整型数字。用于创建随机数种子

Returns:

• The contrast-adjusted image(s).
• 返回对比度调整过后的图片

Raises:

• ValueError: if upper <= lower or if lower < 0.
• 如果 upper <= lower 或者 lower < 0，将 raise ValueError