diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index e80bb717c1..aa22c9c332 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -16,8 +16,8 @@ endif()
 
 find_package(Doxygen)
 if(DOXYGEN_FOUND)
-  if (DOXYGEN_VERSION VERSION_LESS 1.9.8)
-    message(WARNING "Found doxygen ${DOXYGEN_VERSION}, version 1.9.8 is used for testing, there is "
+  if (DOXYGEN_VERSION VERSION_LESS 1.12)
+    message(WARNING "Found doxygen ${DOXYGEN_VERSION}, version 1.12 is used for testing, there is "
                     "a chance your documentation will look different or have some limitations.")
   endif()
   add_custom_target(doxygen)
diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
index 99a9600c67..414fddc62c 100644
--- a/doc/Doxyfile.in
+++ b/doc/Doxyfile.in
@@ -1,9 +1,14 @@
+# Doxyfile 1.12.0
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
 DOXYFILE_ENCODING      = UTF-8
 PROJECT_NAME           = OpenCV
 PROJECT_NUMBER         = @OPENCV_VERSION@
 PROJECT_BRIEF          = "Open Source Computer Vision"
 PROJECT_LOGO           = @CMAKE_CURRENT_SOURCE_DIR@/opencv-logo-small.png
-#PROJECT_ICON           =
+PROJECT_ICON           = @CMAKE_CURRENT_SOURCE_DIR@/opencv.ico
 OUTPUT_DIRECTORY       = @CMAKE_DOXYGEN_OUTPUT_PATH@
 CREATE_SUBDIRS         = YES
 CREATE_SUBDIRS_LEVEL   = 8
@@ -25,7 +30,8 @@ ABBREVIATE_BRIEF       = "The $name class" \
 ALWAYS_DETAILED_SEC    = NO
 INLINE_INHERITED_MEMB  = NO
 FULL_PATH_NAMES        = YES
-STRIP_FROM_PATH        = @CMAKE_SOURCE_DIR@/modules @CMAKE_DOXYGEN_INCLUDE_ROOTS@
+STRIP_FROM_PATH        = @CMAKE_SOURCE_DIR@/modules \
+                         @CMAKE_DOXYGEN_INCLUDE_ROOTS@
 STRIP_FROM_INC_PATH    = @CMAKE_DOXYGEN_INCLUDE_ROOTS@
 SHORT_NAMES            = NO
 JAVADOC_AUTOBRIEF      = NO
@@ -67,6 +73,9 @@ TYPEDEF_HIDES_STRUCT   = YES
 LOOKUP_CACHE_SIZE      = 0
 NUM_PROC_THREADS       = 1
 TIMESTAMP              = YES
+#---------------------------------------------------------------------------
+# Build related configuration options
+#---------------------------------------------------------------------------
 EXTRACT_ALL            = YES
 EXTRACT_PRIVATE        = NO
 EXTRACT_PRIV_VIRTUAL   = NO
@@ -107,6 +116,10 @@ SHOW_NAMESPACES        = YES
 FILE_VERSION_FILTER    =
 LAYOUT_FILE            = @CMAKE_DOXYGEN_LAYOUT@
 CITE_BIB_FILES         = @CMAKE_EXTRA_BIB_FILES@
+EXTERNAL_TOOL_PATH     =
+#---------------------------------------------------------------------------
+# Configuration options related to warning and progress messages
+#---------------------------------------------------------------------------
 QUIET                  = YES
 WARNINGS               = YES
 WARN_IF_UNDOCUMENTED   = YES
@@ -118,6 +131,9 @@ WARN_AS_ERROR          = NO
 WARN_FORMAT            = "$file:$line: $text"
 WARN_LINE_FORMAT       = "at line $line of file $file"
 WARN_LOGFILE           =
+#---------------------------------------------------------------------------
+# Configuration options related to the input files
+#---------------------------------------------------------------------------
 INPUT                  = @CMAKE_DOXYGEN_INPUT_LIST@
 INPUT_ENCODING         = UTF-8
 INPUT_FILE_ENCODING    =
@@ -136,6 +152,10 @@ FILTER_PATTERNS        =
 FILTER_SOURCE_FILES    = NO
 FILTER_SOURCE_PATTERNS =
 USE_MDFILE_AS_MAINPAGE =
+FORTRAN_COMMENT_AFTER  = 72
+#---------------------------------------------------------------------------
+# Configuration options related to source browsing
+#---------------------------------------------------------------------------
 SOURCE_BROWSER         = NO
 INLINE_SOURCES         = NO
 STRIP_CODE_COMMENTS    = YES
@@ -149,8 +169,14 @@ CLANG_ASSISTED_PARSING = NO
 CLANG_ADD_INC_PATHS    = YES
 CLANG_OPTIONS          =
 CLANG_DATABASE_PATH    =
+#---------------------------------------------------------------------------
+# Configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
 ALPHABETICAL_INDEX     = YES
 IGNORE_PREFIX          =
+#---------------------------------------------------------------------------
+# Configuration options related to the HTML output
+#---------------------------------------------------------------------------
 GENERATE_HTML          = YES
 HTML_OUTPUT            = html
 HTML_FILE_EXTENSION    = .html
@@ -166,8 +192,8 @@ HTML_COLORSTYLE_GAMMA  = 80
 HTML_DYNAMIC_MENUS     = YES
 HTML_DYNAMIC_SECTIONS  = NO
 HTML_CODE_FOLDING      = YES
-#HTML_COPY_CLIPBOARD    = YES
-#HTML_PROJECT_COOKIE    =
+HTML_COPY_CLIPBOARD    = YES
+HTML_PROJECT_COOKIE    =
 HTML_INDEX_NUM_ENTRIES = 100
 GENERATE_DOCSET        = NO
 DOCSET_FEEDNAME        = "Doxygen generated docs"
@@ -197,6 +223,7 @@ DISABLE_INDEX          = NO
 GENERATE_TREEVIEW      = NO
 FULL_SIDEBAR           = NO
 ENUM_VALUES_PER_LINE   = 1
+SHOW_ENUM_VALUES       = NO
 TREEVIEW_WIDTH         = 250
 EXT_LINKS_IN_WINDOW    = YES
 OBFUSCATE_EMAILS       = YES
@@ -216,6 +243,9 @@ SEARCHENGINE_URL       =
 SEARCHDATA_FILE        = searchdata.xml
 EXTERNAL_SEARCH_ID     =
 EXTRA_SEARCH_MAPPINGS  =
+#---------------------------------------------------------------------------
+# Configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
 GENERATE_LATEX         = NO
 LATEX_OUTPUT           = latex
 LATEX_CMD_NAME         = latex
@@ -234,31 +264,56 @@ LATEX_BATCHMODE        = NO
 LATEX_HIDE_INDICES     = NO
 LATEX_BIB_STYLE        = plain
 LATEX_EMOJI_DIRECTORY  =
+#---------------------------------------------------------------------------
+# Configuration options related to the RTF output
+#---------------------------------------------------------------------------
 GENERATE_RTF           = NO
 RTF_OUTPUT             = rtf
 COMPACT_RTF            = NO
 RTF_HYPERLINKS         = NO
 RTF_STYLESHEET_FILE    =
 RTF_EXTENSIONS_FILE    =
+RTF_EXTRA_FILES        =
+#---------------------------------------------------------------------------
+# Configuration options related to the man page output
+#---------------------------------------------------------------------------
 GENERATE_MAN           = NO
 MAN_OUTPUT             = man
 MAN_EXTENSION          = .3
 MAN_SUBDIR             =
 MAN_LINKS              = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the XML output
+#---------------------------------------------------------------------------
 GENERATE_XML           = NO
 XML_OUTPUT             = xml
 XML_PROGRAMLISTING     = YES
 XML_NS_MEMB_FILE_SCOPE = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the DOCBOOK output
+#---------------------------------------------------------------------------
 GENERATE_DOCBOOK       = NO
 DOCBOOK_OUTPUT         = docbook
+#---------------------------------------------------------------------------
+# Configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
 GENERATE_AUTOGEN_DEF   = NO
+#---------------------------------------------------------------------------
+# Configuration options related to Sqlite3 output
+#---------------------------------------------------------------------------
 GENERATE_SQLITE3       = NO
 SQLITE3_OUTPUT         = sqlite3
 SQLITE3_RECREATE_DB    = YES
+#---------------------------------------------------------------------------
+# Configuration options related to the Perl module output
+#---------------------------------------------------------------------------
 GENERATE_PERLMOD       = NO
 PERLMOD_LATEX          = NO
 PERLMOD_PRETTY         = YES
 PERLMOD_MAKEVAR_PREFIX =
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor
+#---------------------------------------------------------------------------
 ENABLE_PREPROCESSING   = YES
 MACRO_EXPANSION        = YES
 EXPAND_ONLY_PREDEF     = NO
@@ -307,18 +362,24 @@ PREDEFINED             = __cplusplus=1 \
                          CV_DEPRECATED=
 EXPAND_AS_DEFINED      =
 SKIP_FUNCTION_MACROS   = YES
+#---------------------------------------------------------------------------
+# Configuration options related to external references
+#---------------------------------------------------------------------------
 TAGFILES               =
 GENERATE_TAGFILE       = @CMAKE_DOXYGEN_OUTPUT_PATH@/html/opencv.tag
 ALLEXTERNALS           = NO
 EXTERNAL_GROUPS        = YES
 EXTERNAL_PAGES         = YES
+#---------------------------------------------------------------------------
+# Configuration options related to diagram generator tools
+#---------------------------------------------------------------------------
 HIDE_UNDOC_RELATIONS   = NO
 HAVE_DOT               = @CMAKECONFIG_HAVE_DOT@
 DOT_NUM_THREADS        = 0
-DOT_FONTPATH           =
 DOT_COMMON_ATTR        = "fontname=Helvetica,fontsize=10"
 DOT_EDGE_ATTR          = "labelfontname=Helvetica,labelfontsize=10"
 DOT_NODE_ATTR          = "shape=box,height=0.2,width=0.4"
+DOT_FONTPATH           =
 CLASS_GRAPH            = NO
 COLLABORATION_GRAPH    = YES
 GROUP_GRAPHS           = NO
@@ -338,6 +399,7 @@ DOT_IMAGE_FORMAT       = @CMAKECONFIG_DOT_IMAGE_FORMAT@
 INTERACTIVE_SVG        = @CMAKECONFIG_INTERACTIVE_SVG@
 DOT_PATH               = @CMAKECONFIG_DOT_PATH@
 DOTFILE_DIRS           =
+DIA_PATH               =
 DIAFILE_DIRS           =
 PLANTUML_JAR_PATH      =
 PLANTUML_CFG_FILE      =
diff --git a/doc/footer.html b/doc/footer.html
index 8817f301dd..a019a4c007 100644
--- a/doc/footer.html
+++ b/doc/footer.html
@@ -1,21 +1,18 @@
-<!-- HTML footer for doxygen 1.8.6-->
+<!-- HTML footer for doxygen 1.12.0-->
 <!-- start footer part -->
 <!--BEGIN GENERATE_TREEVIEW-->
 <div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
   <ul>
     $navpath
-    <li class="footer">$generatedby
-    <a href="http://www.doxygen.org/index.html">
-    <img class="footer" src="$relpath^doxygen.png" alt="doxygen"/></a> $doxygenversion </li>
+    <li class="footer">$generatedby <a href="https://www.doxygen.org/index.html"><img class="footer" src="$relpath^doxygen.svg" width="104" height="31" alt="doxygen"/></a> $doxygenversion </li>
   </ul>
 </div>
 <!--END GENERATE_TREEVIEW-->
 <!--BEGIN !GENERATE_TREEVIEW-->
 <hr class="footer"/><address class="footer"><small>
-$generatedby &#160;<a href="http://www.doxygen.org/index.html">
-<img class="footer" src="$relpath^doxygen.png" alt="doxygen"/>
-</a> $doxygenversion
+$generatedby&#160;<a href="https://www.doxygen.org/index.html"><img class="footer" src="$relpath^doxygen.svg" width="104" height="31" alt="doxygen"/></a> $doxygenversion
 </small></address>
+</div><!-- doc-content -->
 <!--END !GENERATE_TREEVIEW-->
 <script type="text/javascript">
 //<![CDATA[
diff --git a/doc/header.html b/doc/header.html
index a5a60eeda6..acc89667a7 100644
--- a/doc/header.html
+++ b/doc/header.html
@@ -1,25 +1,42 @@
-<!-- HTML header for doxygen 1.8.6-->
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
+<!-- HTML header for doxygen 1.12.0-->
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="$langISO">
 <head>
 <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
-<meta http-equiv="X-UA-Compatible" content="IE=9"/>
+<meta http-equiv="X-UA-Compatible" content="IE=11"/>
 <meta name="generator" content="Doxygen $doxygenversion"/>
 <meta name="viewport" content="width=device-width, initial-scale=1"/>
 <!--BEGIN PROJECT_NAME--><title>$projectname: $title</title><!--END PROJECT_NAME-->
 <!--BEGIN !PROJECT_NAME--><title>$title</title><!--END !PROJECT_NAME-->
-<link href="$relpath^opencv.ico" rel="shortcut icon" type="image/x-icon" />
+<!--BEGIN PROJECT_ICON-->
+<link rel="icon" href="$relpath^$projecticon" type="image/x-icon" />
+<!--END PROJECT_ICON-->
 <link href="$relpath^tabs.css" rel="stylesheet" type="text/css"/>
+<!--BEGIN DISABLE_INDEX-->
+  <!--BEGIN FULL_SIDEBAR-->
+<script type="text/javascript">var page_layout=1;</script>
+  <!--END FULL_SIDEBAR-->
+<!--END DISABLE_INDEX-->
 <script type="text/javascript" src="$relpath^jquery.js"></script>
 <script type="text/javascript" src="$relpath^dynsections.js"></script>
 <script type="text/javascript" src="$relpath^tutorial-utils.js"></script>
+<!--BEGIN COPY_CLIPBOARD-->
+<script type="text/javascript" src="$relpath^clipboard.js"></script>
+<!--END COPY_CLIPBOARD-->
 $treeview
 $search
 $mathjax
+$darkmode
 <link href="$relpath^$stylesheet" rel="stylesheet" type="text/css" />
 $extrastylesheet
 </head>
 <body>
+<!--BEGIN DISABLE_INDEX-->
+  <!--BEGIN FULL_SIDEBAR-->
+<div id="side-nav" class="ui-resizable side-nav-resizable"><!-- do not remove this div, it is closed by doxygen! -->
+  <!--END FULL_SIDEBAR-->
+<!--END DISABLE_INDEX-->
+
 <div id="top"><!-- do not remove this div, it is closed by doxygen! -->
 
 <!--BEGIN TITLEAREA-->
@@ -27,31 +44,37 @@ $extrastylesheet
 <!--#include virtual="/google-search.html"-->
 <table cellspacing="0" cellpadding="0">
  <tbody>
- <tr style="height: 56px;">
+ <tr id="projectrow">
   <!--BEGIN PROJECT_LOGO-->
-  <td id="projectlogo"><img alt="Logo" src="$relpath^$projectlogo"/></td>
+  <td id="projectlogo"><img alt="Logo" src="$relpath^$projectlogo"$logosize/></td>
   <!--END PROJECT_LOGO-->
   <!--BEGIN PROJECT_NAME-->
-  <td style="padding-left: 0.5em;">
-   <div id="projectname">$projectname
-   <!--BEGIN PROJECT_NUMBER-->&#160;<span id="projectnumber">$projectnumber</span><!--END PROJECT_NUMBER-->
+  <td id="projectalign">
+   <div id="projectname">$projectname<!--BEGIN PROJECT_NUMBER--><span id="projectnumber">&#160;$projectnumber</span><!--END PROJECT_NUMBER-->
    </div>
    <!--BEGIN PROJECT_BRIEF--><div id="projectbrief">$projectbrief</div><!--END PROJECT_BRIEF-->
   </td>
   <!--END PROJECT_NAME-->
   <!--BEGIN !PROJECT_NAME-->
    <!--BEGIN PROJECT_BRIEF-->
-    <td style="padding-left: 0.5em;">
+    <td>
     <div id="projectbrief">$projectbrief</div>
     </td>
    <!--END PROJECT_BRIEF-->
   <!--END !PROJECT_NAME-->
   <!--BEGIN DISABLE_INDEX-->
    <!--BEGIN SEARCHENGINE-->
-   <td>$searchbox</td>
+     <!--BEGIN !FULL_SIDEBAR-->
+    <td>$searchbox</td>
+     <!--END !FULL_SIDEBAR-->
    <!--END SEARCHENGINE-->
   <!--END DISABLE_INDEX-->
  </tr>
+  <!--BEGIN SEARCHENGINE-->
+   <!--BEGIN FULL_SIDEBAR-->
+   <tr><td colspan="2">$searchbox</td></tr>
+   <!--END FULL_SIDEBAR-->
+  <!--END SEARCHENGINE-->
  </tbody>
 </table>
 </div>
diff --git a/modules/core/include/opencv2/core.hpp b/modules/core/include/opencv2/core.hpp
index f75c76ec05..3a02f260d6 100644
--- a/modules/core/include/opencv2/core.hpp
+++ b/modules/core/include/opencv2/core.hpp
@@ -417,10 +417,6 @@ The function can also be emulated with a matrix expression, for example:
 */
 CV_EXPORTS_W void scaleAdd(InputArray src1, double alpha, InputArray src2, OutputArray dst);
 
-/** @example samples/cpp/tutorial_code/HighGUI/AddingImagesTrackbar.cpp
-Check @ref tutorial_trackbar "the corresponding tutorial" for more details
-*/
-
 /** @brief Calculates the weighted sum of two arrays.
 
 The function addWeighted calculates the weighted sum of two arrays as follows: