habana_frameworks.mediapipe.fn.Hue

Class:

• habana_frameworks.mediapipe.fn.Hue(**kwargs)

Define graph call:

• __call__(input, degree_tensor)

Parameter:

• input - Input tensor to operator. Supported dimensions: minimum = 4, maximum = 4. Supported data types: UINT8, UINT16.

• (optional) degree_tensor - Tensor containing degree value for each image in the batch. Supported dimensions: minimum = 1, maximum = 1. Supported data types: FLOAT32.

Description:

Hue operator modifies the hue of an image by specified degrees. It applies the HSV space modification to an RGB value to get the modified RGB value.

Supported backend:

• HPU

Keyword Arguments

kwargs	Description
degree	Angle by which hue of an image needs to be rotated. Type: float Default: 0.0 Optional: yes
dtype	Output data type. Type: habana_frameworks.mediapipe.media_types.dtype Default: UINT8 Optional: yes Supported data types: UINT8 UINT16

Note

1. Input/output tensor must be of the same data type.

2. Input 1 and output tensor should be in NCHW layout. Input 2 is one dimensional tensor of size N.

3. Angle value can be provided either as scalar or 1D tensor.

4. Number of channels in input and output should be 3.

Example: Hue Operator

Following code snippet shows usage of hue operator.

from habana_frameworks.mediapipe import fn
from habana_frameworks.mediapipe.mediapipe import MediaPipe
from habana_frameworks.mediapipe.media_types import imgtype as it
from habana_frameworks.mediapipe.media_types import dtype as dt
import matplotlib.pyplot as plt
import os

g_display_timeout = os.getenv("DISPLAY_TIMEOUT") or 5

# Create MediaPipe derived class

class myMediaPipe(MediaPipe):
    def __init__(self, device, queue_depth, batch_size, num_threads, op_device, dir, img_h, img_w):
        super(
            myMediaPipe,
            self).__init__(
            device,
            queue_depth,
            batch_size,
            num_threads,
            self.__class__.__name__)

        self.input = fn.ReadImageDatasetFromDir(shuffle=False,
                                                dir=dir,
                                                format="jpg",
                                                device="cpu")

        # WHCN
        self.decode = fn.ImageDecoder(device="hpu",
                                      output_format=it.RGB_P,
                                      resize=[img_w, img_h])

        self.hue = fn.Hue(degree=50,
                          dtype=dt.UINT8,
                          device=op_device)

        # WHCN -> CWHN
        self.transpose = fn.Transpose(permutation=[2, 0, 1, 3],
                                      tensorDim=4,
                                      dtype=dt.UINT8,
                                      device=op_device)

    def definegraph(self):
        images, labels = self.input()
        images = self.decode(images)
        images = self.hue(images)
        images = self.transpose(images)
        return images, labels


def display_images(images, batch_size, cols):
    rows = (batch_size + 1) // cols
    plt.figure(figsize=(10, 10))
    for i in range(batch_size):
        ax = plt.subplot(rows, cols, i + 1)
        plt.imshow(images[i])
        plt.axis("off")
    plt.show(block=False)
    plt.pause(g_display_timeout)
    plt.close()


def run(device, op_device):
    batch_size = 6
    queue_depth = 2
    num_threads = 1
    img_width = 200
    img_height = 200
    base_dir = os.environ['DATASET_DIR']
    dir = base_dir + "/img_data/"
    columns = 3

    # Create MediaPipe object
    pipe = myMediaPipe(device, queue_depth, batch_size,
                      num_threads, op_device, dir,
                      img_height, img_width)

    # Build MediaPipe
    pipe.build()

    # Initialize MediaPipe iterator
    pipe.iter_init()

    # Run MediaPipe
    images, labels = pipe.run()

    def as_cpu(tensor):
        if (callable(getattr(tensor, "as_cpu", None))):
            tensor = tensor.as_cpu()
        return tensor

    # Copy data to host from device as numpy array
    images = as_cpu(images).as_nparray()
    labels = as_cpu(labels).as_nparray()
    del pipe

    # Display images
    display_images(images, batch_size, columns)


if __name__ == "__main__":
    dev_opdev = {'mixed': ['hpu'],
                'legacy': ['hpu']}

    for dev in dev_opdev.keys():
        for op_dev in dev_opdev[dev]:
            run(dev, op_dev)

Images with Changed Hue 1

1

Licensed under a CC BY SA 4.0 license. The images used here are taken from https://data.caltech.edu/records/mzrjq-6wc02.