diff options
Diffstat (limited to 'ftnoir_tracker_pt/point_extractor.cpp')
| -rw-r--r-- | ftnoir_tracker_pt/point_extractor.cpp | 192 |
1 files changed, 96 insertions, 96 deletions
diff --git a/ftnoir_tracker_pt/point_extractor.cpp b/ftnoir_tracker_pt/point_extractor.cpp index 61e86bec..09be967a 100644 --- a/ftnoir_tracker_pt/point_extractor.cpp +++ b/ftnoir_tracker_pt/point_extractor.cpp @@ -1,96 +1,96 @@ -/* Copyright (c) 2012 Patrick Ruoff
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- */
-
-#include "point_extractor.h"
-#include <QDebug>
-
-using namespace cv;
-using namespace std;
-
-// ----------------------------------------------------------------------------
-const vector<Vec2f>& PointExtractor::extract_points(Mat frame, float dt, bool draw_output)
-{
- const int W = frame.cols;
- const int H = frame.rows;
-
- // clear old points
- points.clear();
-
- // convert to grayscale
- Mat frame_grey;
- cvtColor(frame, frame_grey, COLOR_BGR2GRAY);
-
- // convert to binary
- Mat frame_bin;
- threshold(frame_grey, frame_bin, threshold_val, 255, THRESH_BINARY);
-
- unsigned int region_size_min = 3.14*min_size*min_size;
- unsigned int region_size_max = 3.14*max_size*max_size;
-
- int blob_index = 1;
- for (int y=0; y<H; y++)
- {
- for (int x=0; x<W; x++)
- {
- // find connected components with floodfill
- if (frame_bin.at<unsigned char>(y,x) != 255) continue;
- Rect rect;
- floodFill(frame_bin, Point(x,y), Scalar(blob_index), &rect, Scalar(0), Scalar(0), FLOODFILL_FIXED_RANGE);
- blob_index++;
-
- // calculate the size of the connected component
- unsigned int region_size = 0;
- for (int i=rect.y; i < (rect.y+rect.height); i++)
- {
- for (int j=rect.x; j < (rect.x+rect.width); j++)
- {
- if (frame_bin.at<unsigned char>(i,j) != blob_index-1) continue;
- region_size++;
- }
- }
-
- if (region_size < region_size_min || region_size > region_size_max) continue;
-
- // calculate the center of mass:
- // mx = (sum_ij j*f(frame_grey_ij)) / (sum_ij f(frame_grey_ij))
- // my = ...
- // f maps from [threshold,256] -> [0, 1], lower values are mapped to 0
- float m = 0;
- float mx = 0;
- float my = 0;
- for (int i=rect.y; i < (rect.y+rect.height); i++)
- {
- for (int j=rect.x; j < (rect.x+rect.width); j++)
- {
- if (frame_bin.at<unsigned char>(i,j) != blob_index-1) continue;
- float val = frame_grey.at<unsigned char>(i,j);
- val = float(val - threshold_val)/(256 - threshold_val);
- val = val*val; // makes it more stable (less emphasis on low values, more on the peak)
- m += val;
- mx += j * val;
- my += i * val;
- }
- }
-
- // convert to centered camera coordinate system with y axis upwards
- Vec2f c;
- c[0] = (mx/m - W/2)/W;
- c[1] = -(my/m - H/2)/W;
- points.push_back(c);
-
- if (blob_index >= 255) break;
- }
- if (blob_index >= 255) break;
- }
-
- // draw output image
- if (draw_output) {
- frame.setTo(Scalar(255,0,0), frame_bin);
- }
-
- return points;
-}
+/* Copyright (c) 2012 Patrick Ruoff + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + */ + +#include "point_extractor.h" +#include <QDebug> + +using namespace cv; +using namespace std; + +// ---------------------------------------------------------------------------- +const vector<Vec2f>& PointExtractor::extract_points(Mat frame, float dt, bool draw_output) +{ + const int W = frame.cols; + const int H = frame.rows; + + // clear old points + points.clear(); + + // convert to grayscale + Mat frame_grey; + cvtColor(frame, frame_grey, COLOR_BGR2GRAY); + + // convert to binary + Mat frame_bin; + threshold(frame_grey, frame_bin, threshold_val, 255, THRESH_BINARY); + + unsigned int region_size_min = 3.14*min_size*min_size; + unsigned int region_size_max = 3.14*max_size*max_size; + + int blob_index = 1; + for (int y=0; y<H; y++) + { + for (int x=0; x<W; x++) + { + // find connected components with floodfill + if (frame_bin.at<unsigned char>(y,x) != 255) continue; + Rect rect; + floodFill(frame_bin, Point(x,y), Scalar(blob_index), &rect, Scalar(0), Scalar(0), FLOODFILL_FIXED_RANGE); + blob_index++; + + // calculate the size of the connected component + unsigned int region_size = 0; + for (int i=rect.y; i < (rect.y+rect.height); i++) + { + for (int j=rect.x; j < (rect.x+rect.width); j++) + { + if (frame_bin.at<unsigned char>(i,j) != blob_index-1) continue; + region_size++; + } + } + + if (region_size < region_size_min || region_size > region_size_max) continue; + + // calculate the center of mass: + // mx = (sum_ij j*f(frame_grey_ij)) / (sum_ij f(frame_grey_ij)) + // my = ... + // f maps from [threshold,256] -> [0, 1], lower values are mapped to 0 + float m = 0; + float mx = 0; + float my = 0; + for (int i=rect.y; i < (rect.y+rect.height); i++) + { + for (int j=rect.x; j < (rect.x+rect.width); j++) + { + if (frame_bin.at<unsigned char>(i,j) != blob_index-1) continue; + float val = frame_grey.at<unsigned char>(i,j); + val = float(val - threshold_val)/(256 - threshold_val); + val = val*val; // makes it more stable (less emphasis on low values, more on the peak) + m += val; + mx += j * val; + my += i * val; + } + } + + // convert to centered camera coordinate system with y axis upwards + Vec2f c; + c[0] = (mx/m - W/2)/W; + c[1] = -(my/m - H/2)/W; + points.push_back(c); + + if (blob_index >= 255) break; + } + if (blob_index >= 255) break; + } + + // draw output image + if (draw_output) { + frame.setTo(Scalar(255,0,0), frame_bin); + } + + return points; +} |