car_sliding_windows.py

import cv2
import numpy as np
from car_detector.detector import car_detector, bow_features
from car_detector.pyramid import pyramid
from car_detector.non_maximum import non_max_suppression_fast as nms
from car_detector.sliding_window import sliding_window
import urllib

def in_range(number, test, thresh=0.2):
  return abs(number - test) < thresh

test_image = "/home/d3athmast3r/dev/python/pycv/images/cars.jpg"
img_path = "/home/d3athmast3r/dev/python/pycv/images/test.jpg"

urllib.urlretrieve(test_image, img_path)

svm, extractor = car_detector()
detect = cv2.xfeatures2d.SIFT_create()

w, h = 100, 40
img = cv2.imread(img_path)
#img = cv2.imread(test_image)

rectangles = []
counter = 1
scaleFactor = 1.25
scale = 1
font = cv2.FONT_HERSHEY_PLAIN

for resized in pyramid(img, scaleFactor):  
  scale = float(img.shape[1]) / float(resized.shape[1])
  for (x, y, roi) in sliding_window(resized, 20, (100, 40)):
    
    if roi.shape[1] != w or roi.shape[0] != h:
      continue

    try:
      bf = bow_features(roi, extractor, detect)
      _, result = svm.predict(bf)
      a, res = svm.predict(bf, flags=cv2.ml.STAT_MODEL_RAW_OUTPUT | cv2.ml.STAT_MODEL_UPDATE_MODEL)
      print "Class: %d, Score: %f, a: %s" % (result[0][0], res[0][0], res)
      score = res[0][0]
      if result[0][0] == 1:
        if score < -1.0:
          rx, ry, rx2, ry2 = int(x * scale), int(y * scale), int((x+w) * scale), int((y+h) * scale)
          rectangles.append([rx, ry, rx2, ry2, abs(score)])
    except:
      pass

    counter += 1 

windows = np.array(rectangles)
boxes = nms(windows, 0.25)


for (x, y, x2, y2, score) in boxes:
  print x, y, x2, y2, score
  cv2.rectangle(img, (int(x),int(y)),(int(x2), int(y2)),(0, 255, 0), 1)
  cv2.putText(img, "%f" % score, (int(x),int(y)), font, 1, (0, 255, 0))

cv2.imshow("img", img)
cv2.waitKey(0)