252 lines
8.3 KiB
Python
252 lines
8.3 KiB
Python
import cv2
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import numpy as np
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import imutils as im
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from util import bbox_extend, bbox_round, image_crop, to_rect, bbox_add_position, bbox_center
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IMG_SCALE_UP = 1
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IMG_ROTATE = 0
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COLOR_TRACKER = (0, 255, 0)
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COLOR_TRACKER_EXT = (0, 255, 255)
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COLOR_MATCHER = (0, 0, 255)
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COLOR_TEMPLATE = (255, 0, 0)
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TEMPLATE_MATCH_OVERLAP = 0
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class Corner:
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def __init__(self, reference: np.array, bbox: np.array, name: str = 'Corner'):
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self.ref = {'image': reference, 'bbox': bbox, 'offset': (0, 0)}
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self.name = name
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self._path = []
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self.line_from = None
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self.first_frame = True
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def _debug(self, image, matcher_res, matcher_start_x, matcher_start_y, template_scaled, crop_scaled):
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template_img = self.ref['image']
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offset = self.ref['offset']
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(min_val, max_val, min_loc, max_loc) = cv2.minMaxLoc(matcher_res)
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self._print(f"(min_val, max_val, min_loc, max_loc): {(min_val, max_val, min_loc, max_loc)}")
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self._print(f"matcher_start : {(matcher_start_x, matcher_start_y)}")
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self._print(f"matcher_res : {matcher_res.shape}")
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self._print(f"crop : {image.shape}")
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self._print(f"crop_scaled : {crop_scaled.shape}")
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self._print(f"template : {template_img.shape}")
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self._print(f"template_scaled : {template_scaled.shape}")
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self._print(f"offset : {offset}")
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matcher_bbox_local = (matcher_start_x, matcher_start_y, template_img.shape[1], template_img.shape[0])
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matcher_crop = image_crop(image, matcher_bbox_local)
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cv2.imshow(f"{self.name}: Matcher res", matcher_res)
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cv2.imshow(f"{self.name}: Matcher view", matcher_crop)
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def _print(self, s):
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print(f"{self.name}: {s}")
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def process(self, image: np.array):
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image_anno = image.copy()
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crop_scaled = im.resize(image, IMG_SCALE_UP * image.shape[1], IMG_SCALE_UP * image.shape[0])
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template = self.ref['image']
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bb_template = self.ref['bbox']
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# Reseize template
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template_scaled = im.resize(template, IMG_SCALE_UP * template.shape[0], IMG_SCALE_UP * template.shape[1])
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# Match
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matcher_res = cv2.matchTemplate(crop_scaled, template_scaled, cv2.TM_CCOEFF_NORMED)
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(min_val, max_val, min_loc, max_loc) = cv2.minMaxLoc(matcher_res)
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# Get matcher coord
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matcher_start_x = max_loc[0]/IMG_SCALE_UP
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matcher_start_y = max_loc[1]/IMG_SCALE_UP
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# Store offset at first frame
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if self.first_frame:
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self.first_frame = False
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offset_x = matcher_start_x - bb_template[0]
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offset_y = matcher_start_y - bb_template[1]
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self.ref['offset'] = (offset_x, offset_y)
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# Compensate offset
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matcher_start_x -= self.ref['offset'][0]
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matcher_start_y -= self.ref['offset'][1]
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matcher_bbox_local = (matcher_start_x, matcher_start_y, template.shape[1], template.shape[0])
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self._debug(image_anno, matcher_res, matcher_start_x, matcher_start_y, template_scaled, crop_scaled)
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return matcher_bbox_local, matcher_res
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def path_add(self, point):
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if self.line_from is not None:
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self._path.append({'from': self.line_from, 'to': point})
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self.line_from = point
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@property
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def path(self):
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return self._path
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class CornerTracker:
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def __init__(self, name: str = 'CornerTracker'):
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self.name = name
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self.tracking_ref_bb = None
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self.tracking_ref_img = None
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self.tracking_ref_gray_img = None
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self.matching_tpl_bb = None
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self.matching_tpl_img = None
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self.tracking_bb = None
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self.tracking_img = None
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self.tracker = None
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self.corner_list = []
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def _print(self, s):
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print(f"{self.name}: {s}")
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def _debug(self, image_anno, tracking_anno, matcher_bbox_local):
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matcher_bbox = bbox_round(bbox_add_position(matcher_bbox_local, self.tracking_bb))
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template_top_left, template_bottom_right = to_rect(self.matching_tpl_bb)
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cv2.rectangle(tracking_anno, template_top_left, template_bottom_right, COLOR_TEMPLATE, 1)
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matcher_top_left_local, matcher_bottom_right_local = to_rect(bbox_round(matcher_bbox_local))
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cv2.rectangle(tracking_anno, matcher_top_left_local, matcher_bottom_right_local, COLOR_MATCHER, 1)
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matcher_rect = to_rect(matcher_bbox)
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cv2.rectangle(image_anno, matcher_rect[0], matcher_rect[1], COLOR_MATCHER, 1)
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tracker_rect = to_rect(self.tracking_bb)
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cv2.rectangle(image_anno, tracker_rect[0], tracker_rect[1], COLOR_TRACKER, 1)
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def init_reference_frame(self, image: np.array):
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print(f"Select tracking object")
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self.tracking_ref_bb = cv2.selectROI("Select", image, False)
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self.tracking_ref_img = image_crop(image.copy(), self.tracking_ref_bb)
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self.tracking_ref_gray_img = cv2.cvtColor(self.tracking_ref_img, cv2.COLOR_BGR2GRAY)
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self.corner_list = []
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count = 1
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while True:
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self._print(f"Add Corner {count}")
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self.matching_tpl_bb = cv2.selectROI("Image", self.tracking_ref_img, fromCenter=True, showCrosshair=True)
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self.matching_tpl_img = image_crop(self.tracking_ref_gray_img.copy(), self.matching_tpl_bb)
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self.corner_list.append(Corner(self.matching_tpl_img, self.matching_tpl_bb, name=f"Corner-{count}"))
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self._print(f"Corner {count} added")
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self._print(f"Press any key to add another corner or ESC to continue")
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k = cv2.waitKey(-1) & 0xff
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if k == 27:
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break
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count += 1
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self._print(f"Added {count} corners")
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# Initialize tracker with first frame and bounding box
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self.tracker = cv2.TrackerKCF().create()
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self.tracker.init(image, self.tracking_ref_bb)
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cv2.destroyWindow("Select")
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def process(self, image: np.array):
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if self.tracker is None:
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raise Exception(f"{self.name}: Call init_reference_frame() first")
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# Update tracker
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_ok, tracking_bb = self.tracker.update(image)
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if not _ok:
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return None
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tracking_img = image_crop(image.copy(), tracking_bb)
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tracking_img = cv2.cvtColor(tracking_img, cv2.COLOR_BGR2GRAY)
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self.tracking_img = cv2.GaussianBlur(tracking_img, (9, 9), 0)
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self.tracking_bb = tracking_bb
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return self._match(image)
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def _match(self, image: np.array):
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image_anno = image.copy()
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tracking_anno = self.tracking_img.copy()
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corners = []
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for ct in self.corner_list:
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matcher_bbox_local, matcher = ct.process(self.tracking_img)
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matcher_bbox = bbox_add_position(matcher_bbox_local, self.tracking_bb)
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# Draw path
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line_to = bbox_center(matcher_bbox)
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corners.append([line_to])
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self._debug(image_anno, tracking_anno, matcher_bbox_local)
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# refine corners
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corners_refined = self._corner_refine(cv2.cvtColor(image, cv2.COLOR_BGR2GRAY), np.array(corners, dtype=np.float32))
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# store refined corners
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for i in range(corners_refined.shape[0]):
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line_to = (int(corners_refined[i, 0, 0]), int(corners_refined[i, 0, 1]))
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ct = self.corner_list[i]
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ct.path_add(line_to)
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# draw path
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for ct in self.corner_list:
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for p in ct.path:
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cv2.line(image_anno, bbox_round(p['from']), bbox_round(p['to']), (0, 0, 255), 1)
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# show refined corners
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for i in range(corners_refined.shape[0]):
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self._print(f" -- Refined Corner [{i}] ({corners_refined[i, 0, 0]}, {corners_refined[i, 0, 1]})")
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cv2.circle(image_anno, (int(corners_refined[i, 0, 0]), int(corners_refined[i, 0, 1])), 4, (0, 255, 0))
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cv2.imshow(f"{self.name}: Tracker: ", self.tracking_img)
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cv2.imshow(f"{self.name}: Image Anno", image_anno)
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def _corner_refine(self, src_gray, corners_original: np.array):
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# Set the needed parameters to find the refined corners
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win_size = (5, 5)
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zero_zone = (-1, -1)
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criteria = (cv2.TERM_CRITERIA_EPS + cv2.TermCriteria_COUNT, 40, 0.001)
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# Calculate the refined corner locations
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corners_refined = cv2.cornerSubPix(src_gray, corners_original.copy(), win_size, zero_zone, criteria)
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# Write them down
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for i in range(corners_original.shape[0]):
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self._print(f" -- Original Corner [{i}] ({corners_original[i, 0, 0]}, {corners_original[i, 0, 1]})")
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self._print(f" -- Refined Corner [{i}] ({corners_refined[i, 0, 0]}, {corners_refined[i, 0, 1]})")
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return corners_refined
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if __name__ == '__main__':
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video = cv2.VideoCapture('./data/spindle_multi_black/%04d.png')
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if video.isOpened():
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ct = CornerTracker()
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# Read first frame.
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ok, image = video.read()
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if ok:
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ct.init_reference_frame(image)
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else:
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print('Cannot read video file')
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key_wait = -1
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while True:
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# Read a new frame
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ok, image = video.read()
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if ok:
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ct.process(image)
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else:
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video.set(cv2.CAP_PROP_POS_FRAMES, 0)
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continue
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# Exit if ESC pressed
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k = cv2.waitKey(key_wait) & 0xff
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if k == 27:
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break
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if k == ord(' '):
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if key_wait == -1:
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key_wait = 30
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else:
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key_wait = -1
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else:
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print('Cannot open video file')
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