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app.py

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+import gradio as gr
+
+from matplotlib import gridspec
+import matplotlib.pyplot as plt
+import numpy as np
+from PIL import Image
+import tensorflow as tf
+from transformers import SegformerFeatureExtractor, TFSegformerForSemanticSegmentation
+
+feature_extractor = SegformerFeatureExtractor.from_pretrained(
+    "nvidia/segformer-b5-finetuned-cityscapes-1024-1024"
+)
+model = TFSegformerForSemanticSegmentation.from_pretrained(
+    "nvidia/segformer-b5-finetuned-cityscapes-1024-1024"
+)
+
+def ade_palette():
+    """ADE20K palette that maps each class to RGB values."""
+    return [
+        [0, 0, 0],
+        [255, 0, 0],
+        [255, 255, 0],
+        [255, 255, 255],
+        [255, 0, 255],
+        [0, 255, 0],
+        [0, 255, 255],
+        [0, 0, 255],
+        [33, 147, 176],
+        [255, 183, 76],
+        [67, 123, 89],
+        [190, 60, 45],
+        [134, 112, 200],
+        [56, 45, 189],
+        [200, 56, 123],
+        [87, 92, 204],
+        [120, 56, 123],
+        [45, 78, 123],
+        [156, 200, 56],
+        [32, 90, 210],
+        [56, 123, 67],
+        [180, 56, 123],
+        [123, 67, 45],
+        [45, 134, 200],
+        [67, 56, 123],
+        [78, 123, 67],
+        [32, 210, 90],
+        [45, 56, 189],
+        [123, 56, 123],
+        [56, 156, 200],
+        [189, 56, 45],
+        [112, 200, 56],
+        [56, 123, 45],
+        [200, 32, 90],
+        [123, 45, 78],
+        [200, 156, 56],
+        [45, 67, 123],
+        [56, 45, 78],
+        [45, 56, 123],
+        [123, 67, 56],
+        [56, 78, 123],
+        [210, 90, 32],
+        [123, 56, 189],
+        [45, 200, 134],
+        [67, 123, 56],
+        [123, 45, 67],
+        [90, 32, 210],
+        [200, 45, 78],
+        [32, 210, 90],
+        [45, 123, 67],
+        [165, 42, 87],
+        [72, 145, 167],
+        [15, 158, 75],
+        [209, 89, 40],
+        [32, 21, 121],
+        [184, 20, 100],
+        [56, 135, 15],
+        [128, 92, 176],
+        [1, 119, 140],
+        [220, 151, 43],
+        [41, 97, 72],
+        [148, 38, 27],
+        [107, 86, 176],
+        [21, 26, 136],
+        [174, 27, 90],
+        [91, 96, 204],
+        [108, 50, 107],
+        [27, 45, 136],
+        [168, 200, 52],
+        [7, 102, 27],
+        [42, 93, 56],
+        [140, 52, 112],
+        [92, 107, 168],
+        [17, 118, 176],
+        [59, 50, 174],
+        [206, 40, 143],
+        [44, 19, 142],
+        [23, 168, 75],
+        [54, 57, 189],
+        [144, 21, 15],
+        [15, 176, 35],
+        [107, 19, 79],
+        [204, 52, 114],
+        [48, 173, 83],
+        [11, 120, 53],
+        [206, 104, 28],
+        [20, 31, 153],
+        [27, 21, 93],
+        [11, 206, 138],
+        [112, 30, 83],
+        [68, 91, 152],
+        [153, 13, 43],
+        [25, 114, 54],
+        [92, 27, 150],
+        [108, 42, 59],
+        [194, 77, 5],
+        [145, 48, 83],
+        [7, 113, 19],
+        [25, 92, 113],
+        [60, 168, 79],
+        [78, 33, 120],
+        [89, 176, 205],
+        [27, 200, 94],
+        [210, 67, 23],
+        [123, 89, 189],
+        [225, 56, 112],
+        [75, 156, 45],
+        [172, 104, 200],
+        [15, 170, 197],
+        [240, 133, 65],
+        [89, 156, 112],
+        [214, 88, 57],
+        [156, 134, 200],
+        [78, 57, 189],
+        [200, 78, 123],
+        [106, 120, 210],
+        [145, 56, 112],
+        [89, 120, 189],
+        [185, 206, 56],
+        [47, 99, 28],
+        [112, 189, 78],
+        [200, 112, 89],
+        [89, 145, 112],
+        [78, 106, 189],
+        [112, 78, 189],
+        [156, 112, 78],
+        [28, 210, 99],
+        [78, 89, 189],
+        [189, 78, 57],
+        [112, 200, 78],
+        [189, 47, 78],
+        [205, 112, 57],
+        [78, 145, 57],
+        [200, 78, 112],
+        [99, 89, 145],
+        [200, 156, 78],
+        [57, 78, 145],
+        [78, 57, 99],
+        [57, 78, 145],
+        [145, 112, 78],
+        [78, 89, 145],
+        [210, 99, 28],
+        [145, 78, 189],
+        [57, 200, 136],
+        [89, 156, 78],
+        [145, 78, 99],
+        [99, 28, 210],
+        [189, 78, 47],
+        [28, 210, 99],
+        [78, 145, 57],
+    ]
+
+labels_list = []
+
+with open(r'labels.txt', 'r') as fp:
+    for line in fp:
+        labels_list.append(line[:-1])
+
+colormap = np.asarray(ade_palette())
+
+def label_to_color_image(label):
+    if label.ndim != 2:
+        raise ValueError("Expect 2-D input label")
+
+    if np.max(label) >= len(colormap):
+        raise ValueError("label value too large.")
+    return colormap[label]
+
+def draw_plot(pred_img, seg):
+    fig = plt.figure(figsize=(20, 15))
+
+    grid_spec = gridspec.GridSpec(1, 2, width_ratios=[6, 1])
+
+    plt.subplot(grid_spec[0])
+    plt.imshow(pred_img)
+    plt.axis('off')
+    LABEL_NAMES = np.asarray(labels_list)
+    FULL_LABEL_MAP = np.arange(len(LABEL_NAMES)).reshape(len(LABEL_NAMES), 1)
+    FULL_COLOR_MAP = label_to_color_image(FULL_LABEL_MAP)
+
+    unique_labels = np.unique(seg.numpy().astype("uint8"))
+    ax = plt.subplot(grid_spec[1])
+    plt.imshow(FULL_COLOR_MAP[unique_labels].astype(np.uint8), interpolation="nearest")
+    ax.yaxis.tick_right()
+    plt.yticks(range(len(unique_labels)), LABEL_NAMES[unique_labels])
+    plt.xticks([], [])
+    ax.tick_params(width=0.0, labelsize=25)
+    return fig
+
+def sepia(input_img):
+    input_img = Image.fromarray(input_img)
+
+    inputs = feature_extractor(images=input_img, return_tensors="tf")
+    outputs = model(**inputs)
+    logits = outputs.logits
+
+    logits = tf.transpose(logits, [0, 2, 3, 1])
+    logits = tf.image.resize(
+        logits, input_img.size[::-1]
+    )  # We reverse the shape of `image` because `image.size` returns width and height.
+    seg = tf.math.argmax(logits, axis=-1)[0]
+
+    color_seg = np.zeros(
+        (seg.shape[0], seg.shape[1], 3), dtype=np.uint8
+    )  # height, width, 3
+    for label, color in enumerate(colormap):
+        color_seg[seg.numpy() == label, :] = color
+
+    # Show image + mask
+    pred_img = np.array(input_img) * 0.5 + color_seg * 0.5
+    pred_img = pred_img.astype(np.uint8)
+
+    fig = draw_plot(pred_img, seg)
+    return fig
+
+demo = gr.Interface(fn=sepia,
+                    inputs=gr.Image(shape=(400, 600)),
+                    outputs=['plot'],
+                    examples=["cheonggyecheon_stream_in_seoul_city.jpg", "Incheon_stadium.jpeg", "Incheon_city.jpeg"],
+                    allow_flagging='never')
+
+
+demo.launch()

labels.txt

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+road
+sidewalk
+building
+wall
+fence
+pole
+traffic light
+traffic sign
+vegetation
+terrain
+sky
+person
+rider
+car
+truck
+bus
+train
+motorcycle
+bicycle

requirements.txt

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+torch
+transformers
+tensorflow
+numpy
+Image
+matplotlib