From b91f173680af92498a8bd2517fc7c524c2eae640 Mon Sep 17 00:00:00 2001
From: rogday <s.e.a.98@yandex.ru>
Date: Thu, 30 Jun 2022 23:31:52 +0300
Subject: [PATCH] Merge pull request #22147 from rogday:zoom_factor

Add zoom factor to interactive calibration tool

* add zoom factor

* address review comments
---
 apps/interactive-calibration/calibCommon.hpp        |  1 +
 apps/interactive-calibration/calibPipeline.cpp      | 13 +++++++++++--
 apps/interactive-calibration/frameProcessor.cpp     | 12 +++++++++++-
 apps/interactive-calibration/frameProcessor.hpp     |  1 +
 apps/interactive-calibration/main.cpp               |  1 +
 .../parametersController.cpp                        |  1 +
 6 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/apps/interactive-calibration/calibCommon.hpp b/apps/interactive-calibration/calibCommon.hpp
index 617c17dbcf..f3fffa1729 100644
--- a/apps/interactive-calibration/calibCommon.hpp
+++ b/apps/interactive-calibration/calibCommon.hpp
@@ -94,6 +94,7 @@ namespace calib
         int maxFramesNum;
         int minFramesNum;
         bool saveFrames;
+        float zoom;
 
         captureParameters()
         {
diff --git a/apps/interactive-calibration/calibPipeline.cpp b/apps/interactive-calibration/calibPipeline.cpp
index a92dbffc2f..3b0eedffec 100644
--- a/apps/interactive-calibration/calibPipeline.cpp
+++ b/apps/interactive-calibration/calibPipeline.cpp
@@ -5,6 +5,7 @@
 #include "calibPipeline.hpp"
 
 #include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
 
 #include <stdexcept>
 
@@ -58,7 +59,7 @@ PipelineExitStatus CalibPipeline::start(std::vector<cv::Ptr<FrameProcessor> > pr
     if(!mCapture.isOpened())
         throw std::runtime_error("Unable to open video source");
 
-    cv::Mat frame, processedFrame;
+    cv::Mat frame, processedFrame, resizedFrame;
     while(mCapture.grab()) {
         mCapture.retrieve(frame);
         if(mCaptureParams.flipVertical)
@@ -67,7 +68,15 @@ PipelineExitStatus CalibPipeline::start(std::vector<cv::Ptr<FrameProcessor> > pr
         frame.copyTo(processedFrame);
         for (std::vector<cv::Ptr<FrameProcessor> >::iterator it = processors.begin(); it != processors.end(); ++it)
             processedFrame = (*it)->processFrame(processedFrame);
-        cv::imshow(mainWindowName, processedFrame);
+        if (std::fabs(mCaptureParams.zoom - 1.) > 0.001f)
+        {
+            cv::resize(processedFrame, resizedFrame, cv::Size(), mCaptureParams.zoom, mCaptureParams.zoom);
+        }
+        else
+        {
+            resizedFrame = std::move(processedFrame);
+        }
+        cv::imshow(mainWindowName, resizedFrame);
         char key = (char)cv::waitKey(CAP_DELAY);
 
         if(key == 27) // esc
diff --git a/apps/interactive-calibration/frameProcessor.cpp b/apps/interactive-calibration/frameProcessor.cpp
index 2c2a1cd5aa..aa164f2a43 100644
--- a/apps/interactive-calibration/frameProcessor.cpp
+++ b/apps/interactive-calibration/frameProcessor.cpp
@@ -201,7 +201,16 @@ void CalibProcessor::showCaptureMessage(const cv::Mat& frame, const std::string
     double textSize = VIDEO_TEXT_SIZE * frame.cols / (double) IMAGE_MAX_WIDTH;
     cv::bitwise_not(frame, frame);
     cv::putText(frame, message, textOrigin, 1, textSize, cv::Scalar(0,0,255), 2, cv::LINE_AA);
-    cv::imshow(mainWindowName, frame);
+    cv::Mat resized;
+    if (std::fabs(mZoom - 1.) > 0.001f)
+    {
+        cv::resize(frame, resized, cv::Size(), mZoom, mZoom);
+    }
+    else
+    {
+        resized = frame;
+    }
+    cv::imshow(mainWindowName, resized);
     cv::waitKey(300);
 }
 
@@ -267,6 +276,7 @@ CalibProcessor::CalibProcessor(cv::Ptr<calibrationData> data, captureParameters
     mSquareSize = capParams.squareSize;
     mTemplDist = capParams.templDst;
     mSaveFrames = capParams.saveFrames;
+    mZoom = capParams.zoom;
 
     switch(mBoardType)
     {
diff --git a/apps/interactive-calibration/frameProcessor.hpp b/apps/interactive-calibration/frameProcessor.hpp
index 88e87f7b98..e048f84320 100644
--- a/apps/interactive-calibration/frameProcessor.hpp
+++ b/apps/interactive-calibration/frameProcessor.hpp
@@ -51,6 +51,7 @@ protected:
     float mSquareSize;
     float mTemplDist;
     bool mSaveFrames;
+    float mZoom;
 
     bool detectAndParseChessboard(const cv::Mat& frame);
     bool detectAndParseChAruco(const cv::Mat& frame);
diff --git a/apps/interactive-calibration/main.cpp b/apps/interactive-calibration/main.cpp
index b5c3642bb6..c2a6aa7298 100644
--- a/apps/interactive-calibration/main.cpp
+++ b/apps/interactive-calibration/main.cpp
@@ -41,6 +41,7 @@ const std::string keys  =
         "{d        | 0.8     | Min delay between captures}"
         "{pf       | defaultConfig.xml| Advanced application parameters}"
         "{save_frames | false   | Save frames that contribute to final calibration}"
+        "{zoom     | 1       | Zoom factor applied to the image}"
         "{help     |         | Print help}";
 
 bool calib::showOverlayMessage(const std::string& message)
diff --git a/apps/interactive-calibration/parametersController.cpp b/apps/interactive-calibration/parametersController.cpp
index 5659b0e469..b5a01b1ea8 100644
--- a/apps/interactive-calibration/parametersController.cpp
+++ b/apps/interactive-calibration/parametersController.cpp
@@ -90,6 +90,7 @@ bool calib::parametersController::loadFromParser(cv::CommandLineParser &parser)
     mCapParams.squareSize = parser.get<float>("sz");
     mCapParams.templDst = parser.get<float>("dst");
     mCapParams.saveFrames = parser.has("save_frames");
+    mCapParams.zoom = parser.get<float>("zoom");
 
     if(!checkAssertion(mCapParams.squareSize > 0, "Distance between corners or circles must be positive"))
         return false;