Merge pull request card-io#28 from COCUS-NEXT/feature/blur

feat: implement blur in DMZ sources

dmz.cpp

@@ -15,6 +15,7 @@
 #include "cv/stats.h"
 #include "cv/warp.h"
 #include "opencv2/core/core_c.h" // needed for IplImage
+#include "opencv2/imgproc/imgproc.hpp"
 
 #pragma mark life cycle
 
@@ -494,6 +495,23 @@ void dmz_transform_card(dmz_context *dmz, IplImage *sample, dmz_corner_points co
   llcv_unwarp(dmz, sample, src_points, dst_rect, *transformed);
 }
 
+void dmz_blur_card(IplImage* cardImageRGB, ScannerState* state, int unblur)
+{
+    int blurCount = state->mostRecentUsableHSeg.n_offsets - unblur;
+    for (int i = 0; i < state->mostRecentUsableHSeg.n_offsets && i < blurCount ; i++) {
+        int num_x = state->mostRecentUsableHSeg.offsets[i] - 1;
+        int num_y = state->mostRecentUsableVSeg.y_offset - 1;
+        int num_w = state->mostRecentUsableHSeg.number_width + 2;
+        int num_h = kNumberHeight + 2;
+        if (i < 4) num_h *= 2; // blur smaller four digits below first bucket
+        cvSetImageROI(cardImageRGB, cvRect(num_x, num_y, num_w, num_h));
+        cv::Mat blurMat = cv::Mat(cardImageRGB, false);
+        cv::medianBlur(blurMat, blurMat, 25);
+        blurMat.release();
+    }
+    cvResetImageROI(cardImageRGB);
+}
+
 // FOR CYTHON USE ONLY
 #if CYTHON_DMZ
 void dmz_scharr3_dx_abs(IplImage *src, IplImage *dst) {
@@ -653,4 +671,4 @@ void dmz_expiry_extract_group(IplImage *card_y,
 }
 #endif
 
-#endif // COMPILE_DMZ
+#endif // COMPILE_DMZ

dmz.h

@@ -8,6 +8,7 @@
 //
 
 #include "dmz_olm.h"
+#include "scan/scan.h"
 
 #include "opencv2/core/core_c.h" // needed for IplImage
 
@@ -92,6 +93,9 @@ bool dmz_detect_edges(IplImage *y_sample, IplImage *cb_sample, IplImage *cr_samp
 // to free transformed.
 void dmz_transform_card(dmz_context *dmz, IplImage *sample, dmz_corner_points corner_points, FrameOrientation orientation, bool upsample, IplImage **transformed);
 
+// Blurs card number digits on a result image
+// the 'unblur' argument defines how many digits not to blur to remain visible.
+void dmz_blur_card(IplImage* cardImageRGB, ScannerState* state, int unblur);
 
 // FOR CYTHON USE ONLY
 #if CYTHON_DMZ
@@ -113,4 +117,4 @@ void dmz_expiry_extract_group(IplImage *card_y,
 #endif
 
 
-#endif // DMZ_H
+#endif // DMZ_H