#pixel-accuracy

Question 1: Short answer

A $4 \times 4$ binary mask (1 = foreground) is predicted for an image:

\text{ground truth} = \begin{bmatrix}0&0&0&0\\0&1&1&0\\0&1&1&1\\0&0&1&1\end{bmatrix}, \qquad \text{prediction} = \begin{bmatrix}0&0&0&0\\0&1&1&1\\0&1&1&0\\0&0&0&1\end{bmatrix}

The pixel accuracy is , the IoU of the foreground class is , and the Dice coefficient of the foreground, $2|X \cap Y|/(|X| + |Y|)$ , is .

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