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| # ------------------------------------------------------------------------------ | |
| # Copyright (c) Microsoft | |
| # Licensed under the MIT License. | |
| # Written by Bin Xiao (Bin.Xiao@microsoft.com) | |
| # ------------------------------------------------------------------------------ | |
| from __future__ import absolute_import | |
| from __future__ import division | |
| from __future__ import print_function | |
| import cv2 | |
| import numpy as np | |
| def transform_preds(coords, center, scale, output_size): | |
| target_coords = np.zeros(coords.shape) | |
| trans = get_affine_transform(center, scale, 0, output_size, inv=1) | |
| for p in range(coords.shape[0]): | |
| target_coords[p, 0:2] = affine_transform(coords[p, 0:2], trans) | |
| return target_coords | |
| def get_affine_transform(center, | |
| scale, | |
| rot, | |
| output_size, | |
| shift=np.array([0, 0], dtype=np.float32), | |
| inv=0): | |
| if not isinstance(scale, np.ndarray) and not isinstance(scale, list): | |
| # print(scale) | |
| scale = np.array([scale, scale]) | |
| scale_tmp = scale * 200.0 | |
| src_w = scale_tmp[0] | |
| dst_w = output_size[0] | |
| dst_h = output_size[1] | |
| rot_rad = np.pi * rot / 180 | |
| src_dir = get_dir([0, src_w * -0.5], rot_rad) | |
| dst_dir = np.array([0, dst_w * -0.5], np.float32) | |
| src = np.zeros((3, 2), dtype=np.float32) | |
| dst = np.zeros((3, 2), dtype=np.float32) | |
| src[0, :] = center + scale_tmp * shift | |
| src[1, :] = center + src_dir + scale_tmp * shift | |
| dst[0, :] = [dst_w * 0.5, dst_h * 0.5] | |
| dst[1, :] = np.array([dst_w * 0.5, dst_h * 0.5]) + dst_dir | |
| src[2:, :] = get_3rd_point(src[0, :], src[1, :]) | |
| dst[2:, :] = get_3rd_point(dst[0, :], dst[1, :]) | |
| if inv: | |
| trans = cv2.getAffineTransform(np.float32(dst), np.float32(src)) | |
| else: | |
| trans = cv2.getAffineTransform(np.float32(src), np.float32(dst)) | |
| return trans | |
| def affine_transform(pt, t): | |
| new_pt = np.array([pt[0], pt[1], 1.]).T | |
| new_pt = np.dot(t, new_pt) | |
| return new_pt[:2] | |
| def get_3rd_point(a, b): | |
| direct = a - b | |
| return b + np.array([-direct[1], direct[0]], dtype=np.float32) | |
| def get_dir(src_point, rot_rad): | |
| sn, cs = np.sin(rot_rad), np.cos(rot_rad) | |
| src_result = [0, 0] | |
| src_result[0] = src_point[0] * cs - src_point[1] * sn | |
| src_result[1] = src_point[0] * sn + src_point[1] * cs | |
| return src_result | |