tf.keras.ops.image.extract_patches

Extracts patches from the image(s).

tf.keras.ops.image.extract_patches(
    image,
    size,
    strides=None,
    dilation_rate=1,
    padding='valid',
    data_format='channels_last'
)

Args
image	Input image or batch of images. Must be 3D or 4D.
size	Patch size int or tuple (patch_height, patch_widht)
strides	strides along height and width. If not specified, or if None, it defaults to the same value as size.
dilation_rate	This is the input stride, specifying how far two consecutive patch samples are in the input. For value other than 1, strides must be 1. NOTE: strides > 1 is not supported in conjunction with dilation_rate > 1
padding	The type of padding algorithm to use: "same" or "valid".
data_format	string, either "channels_last" or "channels_first". The ordering of the dimensions in the inputs. "channels_last" corresponds to inputs with shape (batch, height, width, channels) while "channels_first" corresponds to inputs with shape (batch, channels, height, weight). It defaults to the image_data_format value found in your Keras config file at ~/.keras/keras.json. If you never set it, then it will be "channels_last".

Returns
Extracted patches 3D (if not batched) or 4D (if batched)

Examples:

image = np.random.random(
    (2, 20, 20, 3)
).astype("float32") # batch of 2 RGB images
patches = keras.ops.image.extract_patches(image, (5, 5))
patches.shape
(2, 4, 4, 75)
image = np.random.random((20, 20, 3)).astype("float32") # 1 RGB image
patches = keras.ops.image.extract_patches(image, (3, 3), (1, 1))
patches.shape
(18, 18, 27)