Module narya.utils.linker

Functions

def affine_transform(pt, t)

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def affine_transform(pt, t):
    new_pt = np.array([pt[0], pt[1], 1.0], dtype=np.float32).T
    new_pt = np.dot(t, new_pt)
    return new_pt[:2]

def ctdet_post_process(dets, c, s, h, w, num_classes)

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def ctdet_post_process(dets, c, s, h, w, num_classes):
    # dets: batch x max_dets x dim
    # return 1-based class det dict
    ret = []
    for i in range(dets.shape[0]):
        top_preds = {}
        dets[i, :, :2] = transform_preds(dets[i, :, 0:2], c[i], s[i], (w, h))
        dets[i, :, 2:4] = transform_preds(dets[i, :, 2:4], c[i], s[i], (w, h))
        classes = dets[i, :, -1]
        for j in range(num_classes):
            inds = classes == j
            top_preds[j + 1] = np.concatenate(
                [
                    dets[i, inds, :4].astype(np.float32),
                    dets[i, inds, 4:5].astype(np.float32),
                ],
                axis=1,
            ).tolist()
        ret.append(top_preds)
    return ret

def get_3rd_point(a, b)

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def get_3rd_point(a, b):
    direct = a - b
    return b + np.array([-direct[1], direct[0]], dtype=np.float32)

def get_affine_transform(center, scale, rot, output_size, shift=array([0., 0.], dtype=float32), inv=0)

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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):
        scale = np.array([scale, scale], dtype=np.float32)

    scale_tmp = scale
    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], np.float32) + 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 get_dir(src_point, rot_rad)

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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

def tlbr_to_tlwh(tlbr)

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def tlbr_to_tlwh(tlbr):
    ret = np.asarray(tlbr).copy()
    ret[2:] -= ret[:2]
    return ret

def tlwh_to_tlbr(tlwh)

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def tlwh_to_tlbr(tlwh):
    ret = np.asarray(tlwh).copy()
    ret[2:] += ret[:2]
    return ret

def transform_preds(coords, center, scale, output_size)

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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 xywh2xyxy(x)

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def xywh2xyxy(x):
    # Convert bounding box format from [x, y, w, h] to [x1, y1, x2, y2]
    y = torch.zeros(x.shape) if x.dtype is torch.float32 else np.zeros(x.shape)
    y[:, 0] = x[:, 0] - x[:, 2] / 2
    y[:, 1] = x[:, 1] - x[:, 3] / 2
    y[:, 2] = x[:, 0] + x[:, 2] / 2
    y[:, 3] = x[:, 1] + x[:, 3] / 2
    return y

def xyxy2xywh(x)

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def xyxy2xywh(x):
    # Convert bounding box format from [x1, y1, x2, y2] to [x, y, w, h]
    y = torch.zeros(x.shape) if x.dtype is torch.float32 else np.zeros(x.shape)
    y[:, 0] = (x[:, 0] + x[:, 2]) / 2
    y[:, 1] = (x[:, 1] + x[:, 3]) / 2
    y[:, 2] = x[:, 2] - x[:, 0]
    y[:, 3] = x[:, 3] - x[:, 1]
    return y