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22 lines
684 B
Python
22 lines
684 B
Python
import tensorflow as tf
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import tensorflow.keras.backend as K
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def depth_loss_function(y_true, y_pred, theta=0.1, maxDepthVal=1000.0/10.0):
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# Point-wise depth
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l_depth = K.mean(K.abs(y_pred - y_true), axis=-1)
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# Edges
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dy_true, dx_true = tf.image.image_gradients(y_true)
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dy_pred, dx_pred = tf.image.image_gradients(y_pred)
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l_edges = K.mean(K.abs(dy_pred - dy_true) + K.abs(dx_pred - dx_true), axis=-1)
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# Structural similarity (SSIM) index
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l_ssim = K.clip((1 - tf.image.ssim(y_true, y_pred, maxDepthVal)) * 0.5, 0, 1)
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# Weights
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w1 = 1.0
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w2 = 1.0
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w3 = theta
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return (w1 * l_ssim) + (w2 * K.mean(l_edges)) + (w3 * K.mean(l_depth)) |