tf.image.psnr

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Returns the Peak Signal-to-Noise Ratio between a and b.

tf.image.psnr(
    a, b, max_val, name=None
)

This is intended to be used on signals (or images). Produces a PSNR value for each image in batch.

The last three dimensions of input are expected to be [height, width, depth].

Example:

# Read images from file.
    im1 = tf.decode_png('path/to/im1.png')
    im2 = tf.decode_png('path/to/im2.png')
    # Compute PSNR over tf.uint8 Tensors.
    psnr1 = tf.image.psnr(im1, im2, max_val=255)

    # Compute PSNR over tf.float32 Tensors.
    im1 = tf.image.convert_image_dtype(im1, tf.float32)
    im2 = tf.image.convert_image_dtype(im2, tf.float32)
    psnr2 = tf.image.psnr(im1, im2, max_val=1.0)
    # psnr1 and psnr2 both have type tf.float32 and are almost equal.

Arguments:

• a: First set of images.
• b: Second set of images.
• max_val: The dynamic range of the images (i.e., the difference between the maximum the and minimum allowed values).
• name: Namespace to embed the computation in.

Returns:

The scalar PSNR between a and b. The returned tensor has type tf.float32 and shape [batch_size, 1].