Recover from quantized flow. Args: dx (ndarray): Quantized dx. dy (ndarray): Quantized dy. max_val (float): Maximum value used when quantizing. denorm (bool): Whether to multiply flow values with width/height. Returns: ndarray: Dequantized flow.
(dx, dy, max_val=0.02, denorm=True)
| 100 | |
| 101 | |
| 102 | def dequantize_flow(dx, dy, max_val=0.02, denorm=True): |
| 103 | """Recover from quantized flow. |
| 104 | |
| 105 | Args: |
| 106 | dx (ndarray): Quantized dx. |
| 107 | dy (ndarray): Quantized dy. |
| 108 | max_val (float): Maximum value used when quantizing. |
| 109 | denorm (bool): Whether to multiply flow values with width/height. |
| 110 | |
| 111 | Returns: |
| 112 | ndarray: Dequantized flow. |
| 113 | """ |
| 114 | assert dx.shape == dy.shape |
| 115 | assert dx.ndim == 2 or (dx.ndim == 3 and dx.shape[-1] == 1) |
| 116 | |
| 117 | dx, dy = [dequantize(d, -max_val, max_val, 255) for d in [dx, dy]] |
| 118 | |
| 119 | if denorm: |
| 120 | dx *= dx.shape[1] |
| 121 | dy *= dx.shape[0] |
| 122 | flow = np.dstack((dx, dy)) |
| 123 | return flow |
| 124 | |
| 125 | |
| 126 | def quantize(arr, min_val, max_val, levels, dtype=np.int64): |
no test coverage detected