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text: update detectRegions()

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This commit is contained in:
Alexander Alekhin
2016-11-26 00:24:15 +03:00
parent 590dc2986d
commit d632079783
2 changed files with 18 additions and 23 deletions
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10
modules/text/samples/textdetection.py
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@@ -5,7 +5,6 @@ import os
import cv2 import cv2
import numpy as np import numpy as np
from matplotlib import pyplot as plt
print('\ntextdetection.py') print('\ntextdetection.py')
print(' A demo script of the Extremal Region Filter algorithm described in:') print(' A demo script of the Extremal Region Filter algorithm described in:')
@@ -50,11 +49,10 @@ for channel in channels:
#Visualization #Visualization
for r in range(0,np.shape(rects)[0]): for r in range(0,np.shape(rects)[0]):
rect = rects[r] rect = rects[r]
cv2.rectangle(vis, (rect[0],rect[1]), (rect[0]+rect[2],rect[1]+rect[3]), (0, 255, 255), 2) cv2.rectangle(vis, (rect[0],rect[1]), (rect[0]+rect[2],rect[1]+rect[3]), (0, 0, 0), 2)
cv2.rectangle(vis, (rect[0],rect[1]), (rect[0]+rect[2],rect[1]+rect[3]), (255, 255, 255), 1)
#Visualization #Visualization
vis = vis[:,:,::-1] #flip the colors dimension from BGR to RGB cv2.imshow("Text detection result", vis)
plt.imshow(vis) cv2.waitKey(0)
plt.xticks([]), plt.yticks([]) # to hide tick values on X and Y axis
plt.show()

31
modules/text/src/erfilter.cpp
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@@ -4175,7 +4175,7 @@ void MSERsToERStats(InputArray image, vector<vector<Point> > &contours, vector<v
void detectRegions(InputArray image, const Ptr<ERFilter>& er_filter1, const Ptr<ERFilter>& er_filter2, CV_OUT vector< vector<Point> >& regions) void detectRegions(InputArray image, const Ptr<ERFilter>& er_filter1, const Ptr<ERFilter>& er_filter2, CV_OUT vector< vector<Point> >& regions)
{ {
// assert correct image type // assert correct image type
CV_Assert( image.getMat().type() == CV_8UC1 ); CV_Assert( image.type() == CV_8UC1 );
// at least one ERFilter must be passed // at least one ERFilter must be passed
CV_Assert( !er_filter1.empty() ); CV_Assert( !er_filter1.empty() );
@@ -4189,36 +4189,33 @@ void detectRegions(InputArray image, const Ptr<ERFilter>& er_filter1, const Ptr<
} }
//Convert each ER to vector<Point> and push it to output regions //Convert each ER to vector<Point> and push it to output regions
Mat src = image.getMat(); const Mat src = image.getMat();
Mat region_mask = Mat::zeros(src.rows+2, src.cols+2, CV_8UC1);
for (size_t i=1; i < ers.size(); i++) //start from 1 to deprecate root region for (size_t i=1; i < ers.size(); i++) //start from 1 to deprecate root region
{ {
ERStat* stat = &ers[i]; ERStat* stat = &ers[i];
//Fill the region and calculate 2nd stage features //Fill the region and calculate 2nd stage features
Mat region = region_mask(Rect(Point(stat->rect.x,stat->rect.y),Point(stat->rect.br().x+2,stat->rect.br().y+2))); Mat region_mask(Size(stat->rect.width + 2, stat->rect.height + 2), CV_8UC1, Scalar(0));
region = Scalar(0); Mat region = region_mask(Rect(1, 1, stat->rect.width, stat->rect.height));
int newMaskVal = 255; int newMaskVal = 255;
int flags = 4 + (newMaskVal << 8) + FLOODFILL_FIXED_RANGE + FLOODFILL_MASK_ONLY; int flags = 4 + (newMaskVal << 8) + FLOODFILL_FIXED_RANGE + FLOODFILL_MASK_ONLY;
Rect rect;
floodFill( src(Rect(Point(stat->rect.x,stat->rect.y),Point(stat->rect.br().x,stat->rect.br().y))), const Point seed_pt(stat->pixel%src.cols, stat->pixel/src.cols);
region, Point(stat->pixel%src.cols - stat->rect.x, stat->pixel/src.cols - stat->rect.y), uchar seed_v = src.at<uchar>(seed_pt);
Scalar(255), &rect, Scalar(stat->level), Scalar(0), flags ); CV_Assert((int)seed_v <= stat->level);
rect.width += 2;
rect.height += 2; floodFill( src(stat->rect),
region = region(rect); region_mask,
seed_pt - stat->rect.tl(),
Scalar(255), NULL, Scalar(/*stat->level*/255), Scalar(0), flags );
vector<vector<Point> > contours; vector<vector<Point> > contours;
vector<Vec4i> hierarchy; vector<Vec4i> hierarchy;
findContours( region, contours, hierarchy, RETR_TREE, CHAIN_APPROX_NONE, Point(0, 0) ); findContours( region, contours, hierarchy, RETR_TREE, CHAIN_APPROX_NONE, stat->rect.tl() );
for (size_t j=0; j < contours[0].size(); j++)
contours[0][j] += (stat->rect.tl()-Point(1,1));
regions.push_back(contours[0]); regions.push_back(contours[0]);
} }
} }
} }