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97 lines
2.8 KiB
Python
97 lines
2.8 KiB
Python
"""
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Generate base anchors on index 0
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"""
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from __future__ import print_function
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import sys
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#from builtins import range
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import numpy as np
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from ..cython.anchors import anchors_cython
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def anchors_plane(feat_h, feat_w, stride, base_anchor):
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return anchors_cython(feat_h, feat_w, stride, base_anchor)
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def generate_anchors(base_size=16, ratios=[0.5, 1, 2],
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scales=2 ** np.arange(3, 6)):
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"""
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Generate anchor (reference) windows by enumerating aspect ratios X
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scales wrt a reference (0, 0, 15, 15) window.
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"""
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base_anchor = np.array([1, 1, base_size, base_size]) - 1
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ratio_anchors = _ratio_enum(base_anchor, ratios)
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anchors = np.vstack([_scale_enum(ratio_anchors[i, :], scales)
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for i in range(ratio_anchors.shape[0])])
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return anchors
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def generate_anchors_fpn(base_size=[64,32,16,8,4], ratios=[0.5, 1, 2],
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scales=8):
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"""
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Generate anchor (reference) windows by enumerating aspect ratios X
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scales wrt a reference (0, 0, 15, 15) window.
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"""
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anchors = []
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_ratios = ratios.reshape( (len(base_size), -1) )
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_scales = scales.reshape( (len(base_size), -1) )
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for i,bs in enumerate(base_size):
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__ratios = _ratios[i]
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__scales = _scales[i]
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#print('anchors_fpn', bs, __ratios, __scales, file=sys.stderr)
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r = generate_anchors(bs, __ratios, __scales)
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#print('anchors_fpn', r.shape, file=sys.stderr)
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anchors.append(r)
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return anchors
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def _whctrs(anchor):
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"""
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Return width, height, x center, and y center for an anchor (window).
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"""
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w = anchor[2] - anchor[0] + 1
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h = anchor[3] - anchor[1] + 1
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x_ctr = anchor[0] + 0.5 * (w - 1)
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y_ctr = anchor[1] + 0.5 * (h - 1)
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return w, h, x_ctr, y_ctr
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def _mkanchors(ws, hs, x_ctr, y_ctr):
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"""
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Given a vector of widths (ws) and heights (hs) around a center
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(x_ctr, y_ctr), output a set of anchors (windows).
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"""
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ws = ws[:, np.newaxis]
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hs = hs[:, np.newaxis]
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anchors = np.hstack((x_ctr - 0.5 * (ws - 1),
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y_ctr - 0.5 * (hs - 1),
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x_ctr + 0.5 * (ws - 1),
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y_ctr + 0.5 * (hs - 1)))
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return anchors
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def _ratio_enum(anchor, ratios):
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"""
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Enumerate a set of anchors for each aspect ratio wrt an anchor.
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"""
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w, h, x_ctr, y_ctr = _whctrs(anchor)
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size = w * h
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size_ratios = size / ratios
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ws = np.round(np.sqrt(size_ratios))
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hs = np.round(ws * ratios)
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anchors = _mkanchors(ws, hs, x_ctr, y_ctr)
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return anchors
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def _scale_enum(anchor, scales):
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"""
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Enumerate a set of anchors for each scale wrt an anchor.
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"""
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w, h, x_ctr, y_ctr = _whctrs(anchor)
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ws = w * scales
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hs = h * scales
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anchors = _mkanchors(ws, hs, x_ctr, y_ctr)
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return anchors
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