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◆ bilinearInterpolatePowerOf2()
| uint8_t fl::bilinearInterpolatePowerOf2 | ( | uint8_t | v00, |
| uint8_t | v10, | ||
| uint8_t | v01, | ||
| uint8_t | v11, | ||
| uint8_t | dx, | ||
| uint8_t | dy ) |
Definition at line 137 of file bilinear_expansion.cpp.
138 {
139 uint16_t dx_inv = 256 - dx; // 0 to 256
140 uint16_t dy_inv = 256 - dy; // 0 to 256
141
142 // Scale down weights to fit into uint16_t
143 uint16_t w00 = (dx_inv * dy_inv) >> 8; // Max value 256
144 uint16_t w10 = (dx * dy_inv) >> 8;
145 uint16_t w01 = (dx_inv * dy) >> 8;
146 uint16_t w11 = (dx * dy) >> 8;
147
148 // Sum of weights should be approximately 256
149 uint16_t weight_sum = w00 + w10 + w01 + w11;
150
151 // Compute the weighted sum of pixel values
152 uint16_t sum = v00 * w00 + v10 * w10 + v01 * w01 + v11 * w11;
153
154 // Normalize the result
155 uint8_t result = (sum + (weight_sum >> 1)) / weight_sum;
156
157 return result;
158}
Referenced by bilinearExpandPowerOf2().
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