diff --git a/posegait/src/estimator.py b/posegait/src/estimator.py
new file mode 100644
index 0000000..b5af503
--- /dev/null
+++ b/posegait/src/estimator.py
@@ -0,0 +1,465 @@
+import itertools
+import logging
+import math
+from collections import namedtuple
+
+import cv2
+import numpy as np
+import tensorflow as tf
+from scipy.ndimage import maximum_filter, gaussian_filter
+
+import common
+from common import CocoPairsNetwork, CocoPairs, CocoPart
+
+logger = logging.getLogger('TfPoseEstimator')
+logger.setLevel(logging.INFO)
+ch = logging.StreamHandler()
+formatter = logging.Formatter('[%(asctime)s] [%(name)s] [%(levelname)s] %(message)s')
+ch.setFormatter(formatter)
+logger.addHandler(ch)
+
+
+class Human:
+    """
+    body_parts: list of BodyPart
+    """
+    __slots__ = ('body_parts', 'pairs', 'uidx_list')
+
+    def __init__(self, pairs):
+        self.pairs = []
+        self.uidx_list = set()
+        self.body_parts = {}
+        for pair in pairs:
+            self.add_pair(pair)
+
+    @staticmethod
+    def _get_uidx(part_idx, idx):
+        return '%d-%d' % (part_idx, idx)
+
+    def add_pair(self, pair):
+        self.pairs.append(pair)
+        self.body_parts[pair.part_idx1] = BodyPart(Human._get_uidx(pair.part_idx1, pair.idx1),
+                                                   pair.part_idx1,
+                                                   pair.coord1[0], pair.coord1[1], pair.score)
+        self.body_parts[pair.part_idx2] = BodyPart(Human._get_uidx(pair.part_idx2, pair.idx2),
+                                                   pair.part_idx2,
+                                                   pair.coord2[0], pair.coord2[1], pair.score)
+        self.uidx_list.add(Human._get_uidx(pair.part_idx1, pair.idx1))
+        self.uidx_list.add(Human._get_uidx(pair.part_idx2, pair.idx2))
+
+    def is_connected(self, other):
+        return len(self.uidx_list & other.uidx_list) > 0
+
+    def merge(self, other):
+        for pair in other.pairs:
+            self.add_pair(pair)
+
+    def part_count(self):
+        return len(self.body_parts.keys())
+
+    def get_max_score(self):
+        return max([x.score for _, x in self.body_parts.items()])
+
+    def __str__(self):
+        return ' '.join([str(x) for x in self.body_parts.values()])
+
+
+class BodyPart:
+    """
+    part_idx : part index(eg. 0 for nose)
+    x, y: coordinate of body part
+    score : confidence score
+    """
+    __slots__ = ('uidx', 'part_idx', 'x', 'y', 'score')
+
+    def __init__(self, uidx, part_idx, x, y, score):
+        self.uidx = uidx
+        self.part_idx = part_idx
+        self.x, self.y = x, y
+        self.score = score
+
+    def get_part_name(self):
+        return CocoPart(self.part_idx)
+
+    def __str__(self):
+        return 'BodyPart:%d-(%.2f, %.2f) score=%.2f' % (self.part_idx, self.x, self.y, self.score)
+
+
+class PoseEstimator:
+    heatmap_supress = False
+    heatmap_gaussian = False
+    adaptive_threshold = False
+
+    NMS_Threshold = 0.15
+    Local_PAF_Threshold = 0.2
+    PAF_Count_Threshold = 5
+    Part_Count_Threshold = 4
+    Part_Score_Threshold = 4.5
+
+    PartPair = namedtuple('PartPair', [
+        'score',
+        'part_idx1', 'part_idx2',
+        'idx1', 'idx2',
+        'coord1', 'coord2',
+        'score1', 'score2'
+    ], verbose=False)
+    
+    #print('PartPair', PartPair)
+
+    def __init__(self):
+        pass
+
+    @staticmethod
+    def non_max_suppression(plain, window_size=3, threshold=NMS_Threshold):
+        under_threshold_indices = plain < threshold
+        plain[under_threshold_indices] = 0
+        return plain * (plain == maximum_filter(plain, footprint=np.ones((window_size, window_size))))
+
+    @staticmethod
+    def estimate(heat_mat, paf_mat):
+        #print('heat_mat', heat_mat)
+        if heat_mat.shape[2] == 19:
+            heat_mat = np.rollaxis(heat_mat, 2, 0)
+        if paf_mat.shape[2] == 38:
+            paf_mat = np.rollaxis(paf_mat, 2, 0)
+
+        if PoseEstimator.heatmap_supress:
+            heat_mat = heat_mat - heat_mat.min(axis=1).min(axis=1).reshape(19, 1, 1)
+            heat_mat = heat_mat - heat_mat.min(axis=2).reshape(19, heat_mat.shape[1], 1)
+
+        if PoseEstimator.heatmap_gaussian:
+            heat_mat = gaussian_filter(heat_mat, sigma=0.5)
+
+        if PoseEstimator.adaptive_threshold:
+            _NMS_Threshold = max(np.average(heat_mat) * 4.0, PoseEstimator.NMS_Threshold)
+            _NMS_Threshold = min(_NMS_Threshold, 0.3)
+        else:
+            _NMS_Threshold = PoseEstimator.NMS_Threshold
+
+        # extract interesting coordinates using NMS.
+        coords = []     # [[coords in plane1], [....], ...]
+        for plain in heat_mat[:-1]:
+            nms = PoseEstimator.non_max_suppression(plain, 5, _NMS_Threshold)
+            coords.append(np.where(nms >= _NMS_Threshold))
+        #print('coords', coords)
+
+        # score pairs
+        pairs_by_conn = list()
+        for (part_idx1, part_idx2), (paf_x_idx, paf_y_idx) in zip(CocoPairs, CocoPairsNetwork):
+            pairs = PoseEstimator.score_pairs(
+                part_idx1, part_idx2,
+                coords[part_idx1], coords[part_idx2],
+                paf_mat[paf_x_idx], paf_mat[paf_y_idx],
+                heatmap=heat_mat,                
+                rescale=(1.0 / heat_mat.shape[2], 1.0 / heat_mat.shape[1])                
+            )
+            #print('pairs', pairs)
+
+            pairs_by_conn.extend(pairs)
+            #print('pairs by conn', pairs_by_conn)
+
+        # merge pairs to human
+        # pairs_by_conn is sorted by CocoPairs(part importance) and Score between Parts.
+        humans = [Human([pair]) for pair in pairs_by_conn]
+        #print('humans', humans)
+        while True:
+            merge_items = None
+            for k1, k2 in itertools.combinations(humans, 2):
+                if k1 == k2:
+                    continue
+                if k1.is_connected(k2):
+                    merge_items = (k1, k2)
+                    break
+
+            if merge_items is not None:
+                merge_items[0].merge(merge_items[1])
+                humans.remove(merge_items[1])
+            else:
+                break
+
+        # reject by subset count
+        humans = [human for human in humans if human.part_count() >= PoseEstimator.PAF_Count_Threshold]
+        #print('humans1', humans)
+        
+        # reject by subset max score
+        humans = [human for human in humans if human.get_max_score() >= PoseEstimator.Part_Score_Threshold]
+        #print('humans2', humans)
+
+        return humans
+
+    @staticmethod
+    def score_pairs(part_idx1, part_idx2, coord_list1, coord_list2, paf_mat_x, paf_mat_y, heatmap, rescale=(1.0, 1.0)):
+        connection_temp = []
+
+        cnt = 0
+        for idx1, (y1, x1) in enumerate(zip(coord_list1[0], coord_list1[1])):
+            for idx2, (y2, x2) in enumerate(zip(coord_list2[0], coord_list2[1])):
+                score, count = PoseEstimator.get_score(x1, y1, x2, y2, paf_mat_x, paf_mat_y)
+                cnt += 1
+                if count < PoseEstimator.PAF_Count_Threshold or score <= 0.0:
+                    continue
+                connection_temp.append(PoseEstimator.PartPair(
+                    score=score,
+                    part_idx1=part_idx1, part_idx2=part_idx2,
+                    idx1=idx1, idx2=idx2,
+                    coord1=(x1 * rescale[0], y1 * rescale[1]),
+                    coord2=(x2 * rescale[0], y2 * rescale[1]),
+                    score1=heatmap[part_idx1][y1][x1],
+                    score2=heatmap[part_idx2][y2][x2],
+                ))
+                #print('connection_temp', connection_temp)
+
+        connection = []
+        used_idx1, used_idx2 = set(), set()
+        for candidate in sorted(connection_temp, key=lambda x: x.score, reverse=True):
+            # check not connected
+            if candidate.idx1 in used_idx1 or candidate.idx2 in used_idx2:
+                continue
+            connection.append(candidate)
+            used_idx1.add(candidate.idx1)
+            used_idx2.add(candidate.idx2)
+            #print('connection', connection)
+
+        return connection
+
+    @staticmethod
+    def get_score(x1, y1, x2, y2, paf_mat_x, paf_mat_y):
+        __num_inter = 10
+        __num_inter_f = float(__num_inter)
+        dx, dy = x2 - x1, y2 - y1
+        normVec = math.sqrt(dx ** 2 + dy ** 2)
+
+        if normVec < 1e-4:
+            return 0.0, 0
+
+        vx, vy = dx / normVec, dy / normVec
+
+        xs = np.arange(x1, x2, dx / __num_inter_f) if x1 != x2 else np.full((__num_inter,), x1)
+        ys = np.arange(y1, y2, dy / __num_inter_f) if y1 != y2 else np.full((__num_inter,), y1)
+        xs = (xs + 0.5).astype(np.int8)
+        ys = (ys + 0.5).astype(np.int8)
+
+        # without vectorization
+        pafXs = np.zeros(__num_inter)
+        pafYs = np.zeros(__num_inter)
+        for idx, (mx, my) in enumerate(zip(xs, ys)):
+            pafXs[idx] = paf_mat_x[my][mx]
+            pafYs[idx] = paf_mat_y[my][mx]
+
+        # vectorization slow?
+        # pafXs = pafMatX[ys, xs]
+        # pafYs = pafMatY[ys, xs]
+
+        local_scores = pafXs * vx + pafYs * vy
+        thidxs = local_scores > PoseEstimator.Local_PAF_Threshold
+
+        return sum(local_scores * thidxs), sum(thidxs)
+
+
+class TfPoseEstimator:
+    ENSEMBLE = 'addup'        # average, addup
+
+    def __init__(self, graph_path, target_size=(320, 240)):
+        self.target_size = target_size
+
+        # load graph
+        with tf.gfile.GFile(graph_path, 'rb') as f:
+            graph_def = tf.GraphDef()
+            graph_def.ParseFromString(f.read())
+
+        self.graph = tf.get_default_graph()
+        tf.import_graph_def(graph_def, name='TfPoseEstimator')
+        self.persistent_sess = tf.Session(graph=self.graph)
+
+        # for op in self.graph.get_operations():
+        #     print(op.name)
+
+        self.tensor_image = self.graph.get_tensor_by_name('TfPoseEstimator/image:0')
+        self.tensor_output = self.graph.get_tensor_by_name('TfPoseEstimator/Openpose/concat_stage7:0')
+
+        self.heatMat = self.pafMat = None
+        
+        print('Inside TFPoseestimator')
+        
+        print('graph_path', graph_path)        
+        
+        # warm-up
+        self.persistent_sess.run(
+            self.tensor_output,
+            feed_dict={
+                self.tensor_image: [np.ndarray(shape=(target_size[1], target_size[0], 3), dtype=np.float32)]
+            }
+        )
+
+    def __del__(self):
+        self.persistent_sess.close()
+
+    @staticmethod
+    def _quantize_img(npimg):
+        npimg_q = npimg + 1.0
+        npimg_q /= (2.0 / 2**8)
+        # npimg_q += 0.5
+        npimg_q = npimg_q.astype(np.uint8)
+        return npimg_q
+
+    @staticmethod
+    def draw_humans(npimg, humans, imgcopy=False):
+        if imgcopy:
+            npimg = np.copy(npimg)
+        image_h, image_w = npimg.shape[:2]
+        centers = {}
+        for human in humans:
+            # draw point
+            for i in range(common.CocoPart.Background.value):
+                if i not in human.body_parts.keys():
+                    continue
+
+                body_part = human.body_parts[i]
+                center = (int(body_part.x * image_w + 0.5), int(body_part.y * image_h + 0.5))
+                centers[i] = center
+                cv2.circle(npimg, center, 3, common.CocoColors[i], thickness=3, lineType=8, shift=0)
+
+            # draw line
+            for pair_order, pair in enumerate(common.CocoPairsRender):
+                if pair[0] not in human.body_parts.keys() or pair[1] not in human.body_parts.keys():
+                    continue
+
+                npimg = cv2.line(npimg, centers[pair[0]], centers[pair[1]], common.CocoColors[pair_order], 3)
+
+        return npimg
+
+    def _get_scaled_img(self, npimg, scale):
+        get_base_scale = lambda s, w, h: max(self.target_size[0] / float(w), self.target_size[1] / float(h)) * s
+        img_h, img_w = npimg.shape[:2]
+
+        if scale is None:
+            if npimg.shape[:2] != (self.target_size[1], self.target_size[0]):
+                # resize
+                npimg = cv2.resize(npimg, self.target_size)
+            return [npimg], [(0.0, 0.0, 1.0, 1.0)]
+        elif isinstance(scale, float):
+            # scaling with center crop
+            base_scale = get_base_scale(scale, img_w, img_h)
+            npimg = cv2.resize(npimg, dsize=None, fx=base_scale, fy=base_scale)
+            ratio_x = (1. - self.target_size[0] / float(npimg.shape[1])) / 2.0
+            ratio_y = (1. - self.target_size[1] / float(npimg.shape[0])) / 2.0
+            roi = self._crop_roi(npimg, ratio_x, ratio_y)
+            return [roi], [(ratio_x, ratio_y, 1.-ratio_x*2, 1.-ratio_y*2)]
+        elif isinstance(scale, tuple) and len(scale) == 2:
+            # scaling with sliding window : (scale, step)
+            base_scale = get_base_scale(scale[0], img_w, img_h)
+            base_scale_w = self.target_size[0] / (img_w * base_scale)
+            base_scale_h = self.target_size[1] / (img_h * base_scale)
+            npimg = cv2.resize(npimg, dsize=None, fx=base_scale, fy=base_scale)
+            window_step = scale[1]
+            rois = []
+            infos = []
+            for ratio_x, ratio_y in itertools.product(np.arange(0., 1.01 - base_scale_w, window_step),
+                                                      np.arange(0., 1.01 - base_scale_h, window_step)):
+                roi = self._crop_roi(npimg, ratio_x, ratio_y)
+                rois.append(roi)
+                infos.append((ratio_x, ratio_y, base_scale_w, base_scale_h))
+            return rois, infos
+        elif isinstance(scale, tuple) and len(scale) == 3:
+            # scaling with ROI : (want_x, want_y, scale_ratio)
+            base_scale = get_base_scale(scale[2], img_w, img_h)
+            npimg = cv2.resize(npimg, dsize=None, fx=base_scale, fy=base_scale)
+            ratio_w = self.target_size[0] / float(npimg.shape[1])
+            ratio_h = self.target_size[1] / float(npimg.shape[0])
+
+            want_x, want_y = scale[:2]
+            ratio_x = want_x - ratio_w / 2.
+            ratio_y = want_y - ratio_h / 2.
+            ratio_x = max(ratio_x, 0.0)
+            ratio_y = max(ratio_y, 0.0)
+            if ratio_x + ratio_w > 1.0:
+                ratio_x = 1. - ratio_w
+            if ratio_y + ratio_h > 1.0:
+                ratio_y = 1. - ratio_h
+
+            roi = self._crop_roi(npimg, ratio_x, ratio_y)
+            return [roi], [(ratio_x, ratio_y, ratio_w, ratio_h)]
+
+    def _crop_roi(self, npimg, ratio_x, ratio_y):
+        target_w, target_h = self.target_size
+        h, w = npimg.shape[:2]
+        x = max(int(w*ratio_x-.5), 0)
+        y = max(int(h*ratio_y-.5), 0)
+        cropped = npimg[y:y+target_h, x:x+target_w]
+
+        cropped_h, cropped_w = cropped.shape[:2]
+        if cropped_w < target_w or cropped_h < target_h:
+            npblank = np.zeros((self.target_size[1], self.target_size[0], 3), dtype=np.uint8)
+
+            copy_x, copy_y = (target_w - cropped_w) // 2, (target_h - cropped_h) // 2
+            npblank[copy_y:copy_y+cropped_h, copy_x:copy_x+cropped_w] = cropped
+        else:
+            return cropped
+
+    def inference(self, npimg, scales=None):
+        if npimg is None:
+            raise Exception('The image is not valid. Please check your image exists.')
+
+        if not isinstance(scales, list):
+            scales = [None]
+
+        if self.tensor_image.dtype == tf.quint8:
+            # quantize input image
+            npimg = TfPoseEstimator._quantize_img(npimg)
+            pass
+
+        rois = []
+        infos = []
+        for scale in scales:
+            roi, info = self._get_scaled_img(npimg, scale)
+            # for dubug...
+            # print(roi[0].shape)
+            # cv2.imshow('a', roi[0])
+            # cv2.waitKey()
+            rois.extend(roi)
+            infos.extend(info)
+
+        logger.debug('inference+')
+        output = self.persistent_sess.run(self.tensor_output, feed_dict={self.tensor_image: rois})
+        heatMats = output[:, :, :, :19]
+        pafMats = output[:, :, :, 19:]
+        logger.debug('inference-')
+
+        output_h, output_w = output.shape[1:3]
+        max_ratio_w = max_ratio_h = 10000.0
+        for info in infos:
+            max_ratio_w = min(max_ratio_w, info[2])
+            max_ratio_h = min(max_ratio_h, info[3])
+        mat_w, mat_h = int(output_w/max_ratio_w), int(output_h/max_ratio_h)
+        resized_heatMat = np.zeros((mat_h, mat_w, 19), dtype=np.float32)
+        resized_pafMat = np.zeros((mat_h, mat_w, 38), dtype=np.float32)
+        resized_cntMat = np.zeros((mat_h, mat_w, 1), dtype=np.float32)
+        resized_cntMat += 1e-12
+
+        for heatMat, pafMat, info in zip(heatMats, pafMats, infos):
+            w, h = int(info[2]*mat_w), int(info[3]*mat_h)
+            heatMat = cv2.resize(heatMat, (w, h))
+            pafMat = cv2.resize(pafMat, (w, h))
+            x, y = int(info[0] * mat_w), int(info[1] * mat_h)
+
+            if TfPoseEstimator.ENSEMBLE == 'average':
+                # average
+                resized_heatMat[max(0, y):y + h, max(0, x):x + w, :] += heatMat[max(0, -y):, max(0, -x):, :]
+                resized_pafMat[max(0,y):y+h, max(0, x):x+w, :] += pafMat[max(0, -y):, max(0, -x):, :]
+                resized_cntMat[max(0,y):y+h, max(0, x):x+w, :] += 1
+            else:
+                # add up
+                resized_heatMat[max(0, y):y + h, max(0, x):x + w, :] = np.maximum(resized_heatMat[max(0, y):y + h, max(0, x):x + w, :], heatMat[max(0, -y):, max(0, -x):, :])
+                resized_pafMat[max(0,y):y+h, max(0, x):x+w, :] += pafMat[max(0, -y):, max(0, -x):, :]
+                resized_cntMat[max(0, y):y + h, max(0, x):x + w, :] += 1
+
+        if TfPoseEstimator.ENSEMBLE == 'average':
+            self.heatMat = resized_heatMat / resized_cntMat
+            self.pafMat = resized_pafMat / resized_cntMat
+        else:
+            self.heatMat = resized_heatMat
+            self.pafMat = resized_pafMat / (np.log(resized_cntMat) + 1)
+
+        humans = PoseEstimator.estimate(self.heatMat, self.pafMat)
+        #print('humans', humans)
+        return humans