initial commit

Author: Youngmin Baek

.gitignore

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+*.pyc
+*.swp
+*.pkl
+*.pth
+result*
+weights*

README.md

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+## CRAFT: Character-Region Awareness For Text detection
+Official Pytorch implementation of CRAFT text detector | [Paper](https://arxiv.org/abs/1904.01941) | [Pretrained Model](https://drive.google.com/open?id=1Jk4eGD7crsqCCg9C9VjCLkMN3ze8kutZ) | [Supplementary](https://youtu.be/HI8MzpY8KMI)
+
+**[Youngmin Baek](mailto:[email protected]), Bado Lee, Dongyoon Han, Sangdoo Yun, Hwalsuk Lee.**
+ 
+Clova AI Research, NAVER Corp.
+
+### Sample Results
+
+### Overview
+PyTorch implementation for CRAFT text detector that effectively detect text area by exploring each character region and affinity between characters. The bounding box of texts are obtained by simply finding minimum bounding rectangles on binary map after thresholding character region and affinity scores. 
+
+<img width="1000" alt="teaser" src="./figures/craft_example.gif">
+
+## Updates
+**4 Jun, 2019**: Initial update
+
+
+## Getting started
+### Install dependencies
+#### Requirements
+- PyTorch>=0.4.1
+- torchvision>=0.2.1
+- opencv-python>=3.4.2
+- check requiremtns.txt
+```
+pip install -r requirements.txt
+```
+
+### Training
+We are currently in the process of cleaning training code for disclosure.
+
+### Test instruction using pretrained model
+- Download [Trained Model on IC13,IC17](https://drive.google.com/open?id=1Jk4eGD7crsqCCg9C9VjCLkMN3ze8kutZ)
+* Run with pretrained model
+``` (with python 3.7)
+python test.py --trained_model=[weightfile] --test_folder=[folder path to test images]
+```
+
+The result image and socre maps will be saved to `./result` by default.
+
+### Arguments
+* `--trained_model`: pretrained model
+* `--text_threshold`: text confidence threshold
+* `--low_text`: text low-bound score
+* `--link_threshold`: link confidence threshold
+* `--canvas_size`: max image size for inference
+* `--mag_ratio`: image magnification ratio
+* `--show_time`: show processing time
+* `--test_folder`: folder path to input images
+
+## Citation
+```
+@article{baek2019character,
+  title={Character Region Awareness for Text Detection},
+  author={Baek, Youngmin and Lee, Bado and Han, Dongyoon and Yun, Sangdoo and Lee, Hwalsuk},
+  journal={arXiv preprint arXiv:1904.01941},
+  year={2019}
+}
+```
+
+## License
+```
+Copyright (c) 2019-present NAVER Corp.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+```

basenet/__init__.py

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+from collections import namedtuple
+
+import torch
+import torch.nn as nn
+import torch.nn.init as init
+from torchvision import models
+from torchvision.models.vgg import model_urls
+
+def init_weights(modules):
+    for m in modules:
+        if isinstance(m, nn.Conv2d):
+            init.xavier_uniform_(m.weight.data)
+            if m.bias is not None:
+                m.bias.data.zero_()
+        elif isinstance(m, nn.BatchNorm2d):
+            m.weight.data.fill_(1)
+            m.bias.data.zero_()
+        elif isinstance(m, nn.Linear):
+            m.weight.data.normal_(0, 0.01)
+            m.bias.data.zero_()
+
+class vgg16_bn(torch.nn.Module):
+    def __init__(self, pretrained=True, freeze=True):
+        super(vgg16_bn, self).__init__()
+        model_urls['vgg16_bn'] = model_urls['vgg16_bn'].replace('https://', 'http://')
+        vgg_pretrained_features = models.vgg16_bn(pretrained=pretrained).features
+        self.slice1 = torch.nn.Sequential()
+        self.slice2 = torch.nn.Sequential()
+        self.slice3 = torch.nn.Sequential()
+        self.slice4 = torch.nn.Sequential()
+        self.slice5 = torch.nn.Sequential()
+        for x in range(12):         # conv2_2
+            self.slice1.add_module(str(x), vgg_pretrained_features[x])
+        for x in range(12, 19):         # conv3_3
+            self.slice2.add_module(str(x), vgg_pretrained_features[x])
+        for x in range(19, 29):         # conv4_3
+            self.slice3.add_module(str(x), vgg_pretrained_features[x])
+        for x in range(29, 39):         # conv5_3
+            self.slice4.add_module(str(x), vgg_pretrained_features[x])
+
+        # fc6, fc7 without atrous conv
+        self.slice5 = torch.nn.Sequential(
+                nn.MaxPool2d(kernel_size=3, stride=1, padding=1),
+                nn.Conv2d(512, 1024, kernel_size=3, padding=6, dilation=6),
+                nn.Conv2d(1024, 1024, kernel_size=1)
+        )
+
+        if not pretrained:
+            init_weights(self.slice1.modules())
+            init_weights(self.slice2.modules())
+            init_weights(self.slice3.modules())
+            init_weights(self.slice4.modules())
+
+        init_weights(self.slice5.modules())        # no pretrained model for fc6 and fc7
+
+        if freeze:
+            for param in self.slice1.parameters():      # only first conv
+                param.requires_grad= False
+
+    def forward(self, X):
+        h = self.slice1(X)
+        h_relu2_2 = h
+        h = self.slice2(h)
+        h_relu3_2 = h
+        h = self.slice3(h)
+        h_relu4_3 = h
+        h = self.slice4(h)
+        h_relu5_3 = h
+        h = self.slice5(h)
+        h_fc7 = h
+        vgg_outputs = namedtuple("VggOutputs", ['fc7', 'relu5_3', 'relu4_3', 'relu3_2', 'relu2_2'])
+        out = vgg_outputs(h_fc7, h_relu5_3, h_relu4_3, h_relu3_2, h_relu2_2)
+        return out

basenet/vgg16_bn.py

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+# -*- coding: utf-8 -*-
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+from basenet.vgg16_bn import vgg16_bn, init_weights
+
+class double_conv(nn.Module):
+    def __init__(self, in_ch, mid_ch, out_ch):
+        super(double_conv, self).__init__()
+        self.conv = nn.Sequential(
+            nn.Conv2d(in_ch + mid_ch, mid_ch, kernel_size=1),
+            nn.BatchNorm2d(mid_ch),
+            nn.ReLU(inplace=True),
+            nn.Conv2d(mid_ch, out_ch, kernel_size=3, padding=1),
+            nn.BatchNorm2d(out_ch),
+            nn.ReLU(inplace=True)
+        )
+
+    def forward(self, x):
+        x = self.conv(x)
+        return x
+
+
+class CRAFT(nn.Module):
+    def __init__(self, pretrained=False, freeze=False):
+        super(CRAFT, self).__init__()
+
+        """ Base network """
+        self.basenet = vgg16_bn(pretrained, freeze)
+
+        """ U network """
+        self.upconv1 = double_conv(1024, 512, 256)
+        self.upconv2 = double_conv(512, 256, 128)
+        self.upconv3 = double_conv(256, 128, 64)
+        self.upconv4 = double_conv(128, 64, 32)
+
+        num_class = 2
+        self.conv_cls = nn.Sequential(
+            nn.Conv2d(32, 32, kernel_size=3, padding=1), nn.ReLU(inplace=True),
+            nn.Conv2d(32, 32, kernel_size=3, padding=1), nn.ReLU(inplace=True),
+            nn.Conv2d(32, 16, kernel_size=3, padding=1), nn.ReLU(inplace=True),
+            nn.Conv2d(16, 16, kernel_size=1), nn.ReLU(inplace=True),
+            nn.Conv2d(16, num_class, kernel_size=1),
+        )
+
+        init_weights(self.upconv1.modules())
+        init_weights(self.upconv2.modules())
+        init_weights(self.upconv3.modules())
+        init_weights(self.upconv4.modules())
+        init_weights(self.conv_cls.modules())
+        
+    def forward(self, x):
+        """ Base network """
+        sources = self.basenet(x)
+
+        """ U network """
+        y = torch.cat([sources[0], sources[1]], dim=1)
+        y = self.upconv1(y)
+
+        y = F.interpolate(y, size=sources[2].size()[2:], mode='bilinear', align_corners=False)
+        y = torch.cat([y, sources[2]], dim=1)
+        y = self.upconv2(y)
+
+        y = F.interpolate(y, size=sources[3].size()[2:], mode='bilinear', align_corners=False)
+        y = torch.cat([y, sources[3]], dim=1)
+        y = self.upconv3(y)
+
+        y = F.interpolate(y, size=sources[4].size()[2:], mode='bilinear', align_corners=False)
+        y = torch.cat([y, sources[4]], dim=1)
+        feature = self.upconv4(y)
+
+        y = self.conv_cls(feature)
+
+        return y.permute(0,2,3,1), feature
+
+if __name__ == '__main__':
+    model = CRAFT(pretrained=True).cuda()
+    output, _ = model(torch.randn(1, 3, 768, 768).cuda())
+    print(output.shape)

craft.py

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+# -*- coding: utf-8 -*-
+import numpy as np
+import cv2
+import math
+
+
+def getDetBoxes_core(textmap, linkmap, text_threshold, link_threshold, low_text):
+    # prepare data
+    linkmap = linkmap.copy()
+    textmap = textmap.copy()
+    img_h, img_w = textmap.shape
+
+    """ labeling method """
+    ret, text_score = cv2.threshold(textmap, low_text, 1, 0)
+    ret, link_score = cv2.threshold(linkmap, link_threshold, 1, 0)
+
+    text_score_comb = np.clip(text_score + link_score, 0, 1)
+    nLabels, labels, stats, centroids = cv2.connectedComponentsWithStats(text_score_comb.astype(np.uint8), connectivity=4)
+
+    det = []
+    mapper = []
+    for k in range(1,nLabels):
+        # size filtering
+        size = stats[k, cv2.CC_STAT_AREA]
+        if size < 10: continue
+
+        # thresholding
+        if np.max(textmap[labels==k]) < text_threshold: continue
+
+        # make segmentation map
+        segmap = np.zeros(textmap.shape, dtype=np.uint8)
+        segmap[labels==k] = 255
+        segmap[np.logical_and(link_score==1, text_score==0)] = 0   # remove link area
+        x, y = stats[k, cv2.CC_STAT_LEFT], stats[k, cv2.CC_STAT_TOP]
+        w, h = stats[k, cv2.CC_STAT_WIDTH], stats[k, cv2.CC_STAT_HEIGHT]
+        niter = int(math.sqrt(size * min(w, h) / (w * h)) * 2)
+        sx, ex, sy, ey = x - niter, x + w + niter + 1, y - niter, y + h + niter + 1
+        # boundary check
+        if sx < 0 : sx = 0
+        if sy < 0 : sy = 0
+        if ex >= img_w: ex = img_w
+        if ey >= img_h: ey = img_h
+        kernel = cv2.getStructuringElement(cv2.MORPH_RECT,(1 + niter, 1 + niter))
+        segmap[sy:ey, sx:ex] = cv2.dilate(segmap[sy:ey, sx:ex], kernel)
+
+        # make box
+        np_contours = np.roll(np.array(np.where(segmap!=0)),1,axis=0).transpose().reshape(-1,2)
+        rectangle = cv2.minAreaRect(np_contours)
+        box = cv2.boxPoints(rectangle)
+
+        # align diamond-shape
+        w, h = np.linalg.norm(box[0] - box[1]), np.linalg.norm(box[1] - box[2])
+        box_ratio = max(w, h) / (min(w, h) + 1e-5)
+        if abs(1 - box_ratio) <= 0.1:
+            l, r = min(np_contours[:,0]), max(np_contours[:,0])
+            t, b = min(np_contours[:,1]), max(np_contours[:,1])
+            box = np.array([[l, t], [r, t], [r, b], [l, b]], dtype=np.float32)
+
+        # make clock-wise order
+        startidx = box.sum(axis=1).argmin()
+        box = np.roll(box, 4-startidx, 0)
+        box = np.array(box)
+
+        det.append(box)
+        mapper.append(k)
+
+    return det, labels, mapper
+
+
+def getDetBoxes(textmap, linkmap, text_threshold, link_threshold, low_text):
+    boxes, labels, mapper = getDetBoxes_core(textmap, linkmap, text_threshold, link_threshold, low_text)
+
+    return boxes
+
+def adjustResultCoordinates(polys, ratio_w, ratio_h, ratio_net = 2):
+    if len(polys) > 0:
+        polys = np.array(polys)
+        for k in range(len(polys)):
+            if polys[k] is not None:
+                polys[k] *= (ratio_w * ratio_net, ratio_h * ratio_net)
+    return polys