对代码中比较重要的地方添加注释,包括自己的理解和一些参考。
补充IoU, 非极大值抑制, python的argparse模块等相关知识点。
import _init_paths
from fast_rcnn.config import cfg
#im_detect 生成RPN候选框
from fast_rcnn.test import im_detect
#nms 进行非极大值抑制
from fast_rcnn.nms_wrapper import nms
from utils.timer import Timer
import matplotlib.pyplot as plt
import numpy as np
import scipy.io as sio
import caffe, os, sys, cv2
#引入argparse, 它python用于解析命令行参数和选项的
#标准模块,用于解析命令行参数
import argparse
CLASSES = ('__background__',
'aeroplane', 'bicycle', 'bird', 'boat',
'bottle', 'bus', 'car', 'cat', 'chair',
'cow', 'diningtable', 'dog', 'horse',
'motorbike', 'person', 'pottedplant',
'sheep', 'sofa', 'train', 'tvmonitor')
NETS = {'vgg16': ('VGG16',
'VGG16_faster_rcnn_final.caffemodel'),
'zf': ('ZF',
'ZF_faster_rcnn_final.caffemodel')}
def vis_detections(im, class_name, dets, thresh=0.5):
"""Draw detected bounding boxes."""
##选取候选框score大于阈值的dets
inds = np.where(dets[:, -1] >= thresh)[0]
if len(inds) == 0:
return
# python-opencv 中读取图片默认保存为[w,h,channel](w,h顺序不确定)
# 其中 channel:BGR 存储,而画图时,需要按RGB格式,因此此处作转换。
im = im[:, :, (2, 1, 0)]
fig, ax = plt.subplots(figsize=(12, 12))
ax.imshow(im, aspect='equal')
for i in inds:
#从dets中取出 bbox, score
bbox = dets[i, :4]
score = dets[i, -1]
根据起始点坐标以及w,h 画出矩形框
ax.add_patch(
plt.Rectangle((bbox[0], bbox[1]),
bbox[2] - bbox[0],
bbox[3] - bbox[1], fill=False,
edgecolor='red', linewidth=3.5)
)
ax.text(bbox[0], bbox[1] - 2,
'{:s} {:.3f}'.format(class_name, score),
bbox=dict(facecolor='blue', alpha=0.5),
fontsize=14, color='white')
ax.set_title(('{} detections with '
'p({} | box) >= {:.1f}').format(class_name, class_name,
thresh),
fontsize=14)
plt.axis('off')
plt.tight_layout()
plt.draw()
def demo(net, image_name):
"""Detect object classes in an image using pre-computed object proposals."""
# Load the demo image
im_file = os.path.join(cfg.DATA_DIR, 'demo', image_name)
im = cv2.imread(im_file)
# Detect all object classes and regress object bounds
timer = Timer()
timer.tic()
scores, boxes = im_detect(net, im)
timer.toc()
print ('Detection took {:.3f}s for '
'{:d} object proposals').format(timer.total_time, boxes.shape[0])
# Visualize detections for each class
#score 阈值,最后画出候选框时需要,>thresh才会被画出
CONF_THRESH = 0.8
#非极大值抑制的阈值,剔除重复候选框
NMS_THRESH = 0.3
#利用enumerate函数,获得CLASSES中 类别的下标cls_ind和类别名cls
for cls_ind, cls in enumerate(CLASSES[1:]):
cls_ind += 1 # because we skipped background
#取出bbox ,score
cls_boxes = boxes[:, 4*cls_ind:4*(cls_ind + 1)]
cls_scores = scores[:, cls_ind]
#将bbox,score 一起存入dets
dets = np.hstack((cls_boxes,
cls_scores[:, np.newaxis])).astype(np.float32)
#进行非极大值抑制,得到抑制后的 dets
keep = nms(dets, NMS_THRESH)
dets = dets[keep, :]
#画框
vis_detections(im, cls, dets, thresh=CONF_THRESH)
def parse_args():
"""Parse input arguments."""
#创建解析对象
parser = argparse.ArgumentParser(description='Faster R-CNN demo')
#parser.add_argument 向解析对象添加关注的命令行参数
parser.add_argument('--gpu', dest='gpu_id', help='GPU device id to use [0]',
default=0, type=int)
parser.add_argument('--cpu', dest='cpu_mode',
help='Use CPU mode (overrides --gpu)',
action='store_true')
parser.add_argument('--net', dest='demo_net', help='Network to use [vgg16]',
choices=NETS.keys(), default='vgg16')
#调用parser.parse_args进行解析,返回带标注的args
args = parser.parse_args()
return args#
if __name__ == '__main__':
cfg.TEST.HAS_RPN = True # Use RPN for proposals
#解析
args = parse_args()
#添加路径
prototxt = os.path.join(cfg.MODELS_DIR, NETS[args.demo_net][0],
'faster_rcnn_alt_opt', 'faster_rcnn_test.pt')
caffemodel = os.path.join(cfg.DATA_DIR, 'faster_rcnn_models',
NETS[args.demo_net][1])
if not os.path.isfile(caffemodel):
raise IOError(('{:s} not found.\nDid you run ./data/script/'
'fetch_faster_rcnn_models.sh?').format(caffemodel))
#gpu or cpu
if args.cpu_mode:
caffe.set_mode_cpu()
else:
caffe.set_mode_gpu()
caffe.set_device(args.gpu_id)
cfg.GPU_ID = args.gpu_id
net = caffe.Net(prototxt, caffemodel, caffe.TEST)
print '\n\nLoaded network {:s}'.format(caffemodel)
# Warmup on a dummy image
im = 128 * np.ones((300, 500, 3), dtype=np.uint8
for i in xrange(2):
_, _= im_detect(net, im)
#im_names = ['000456.jpg', '000542.jpg', '001150.jpg',
# '001763.jpg', '004545.jpg']
im_names = ['000001.jpg','000002.jpg','000003.jpg','000004.jpg','000005.jpg','1.jpg','2.jpg','3.jpg','4.jpg','5.jpg']
for im_name in im_names:
print '~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~'
print 'Demo for data/demo/{}'.format(im_name)
demo(net, im_name)
plt.show()
补充:
参考博客:http://www.2cto.com/kf/201412/363654.html
一 argparse
简介:
argparse是python用于解析命令行参数和选项的标准模块,用于代替已经过时的optparse模块。argparse模块的作用是用于解析命令行参数,例如python parseTest.py input.txt output.txt –user=name –port=8080。
使用步骤:
1:import argparse
2:parser = argparse.ArgumentParser()
3:parser.add_argument()
4:parser.parse_args()
解释:首先导入该模块;然后创建一个解析对象;然后向该对象中添加你要关注的命令行参数和选项,每一个add_argument方法对应一个你要关注的参数或选项;最后调用parse_args()方法进行解析;
二. IoU, 非极大值抑制
参考之前博客:
http://blog.csdn.net/u013129427/article/details/73162817