Merge pull request #26872 from sturkmen72:ImageEncoders_revisions

Performance tests for image encoders and decoders and code cleanup #26872

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/highgui/src/window_w32.cpp

@@ -2170,9 +2170,15 @@ static void showSaveDialog(CvWindow& window)
 #ifdef HAVE_WEBP
                       "WebP files (*.webp)\0*.webp\0"
 #endif
-                      "Portable image format (*.pbm;*.pgm;*.ppm;*.pxm;*.pnm)\0*.pbm;*.pgm;*.ppm;*.pxm;*.pnm\0"
+                      "Portable image format (*.pbm;*.pgm;*.ppm;*.pnm;*.pam)\0*.pbm;*.pgm;*.ppm;*.pnm;*.pam\0"
 #ifdef HAVE_OPENEXR
                       "OpenEXR Image files (*.exr)\0*.exr\0"
+#endif
+#ifdef HAVE_AVIF
+                      "AVIF files (*.avif)\0*.avif\0"
+#endif
+#ifdef HAVE_IMGCODEC_GIF
+                      "Graphics Interchange Format 89a(*.gif)\0*.gif\0"
 #endif
                       "Radiance HDR (*.hdr;*.pic)\0*.hdr;*.pic\0"
                       "Sun raster files (*.sr;*.ras)\0*.sr;*.ras\0"
@@ -2194,7 +2200,7 @@ static void showSaveDialog(CvWindow& window)
     }
 #else
     CV_UNUSED(window);
-    CV_LOG_WARNING("Save dialog requires enabled 'imgcodecs' module.");
+    CV_LOG_WARNING(NULL, "Save dialog requires enabled 'imgcodecs' module.");
     return;
 #endif
 }

modules/imgcodecs/perf/perf_decode_encode.cpp

@@ -0,0 +1,131 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html
+
+#include "perf_precomp.hpp"
+
+namespace opencv_test
+{
+
+#ifdef HAVE_PNG
+
+using namespace perf;
+
+typedef perf::TestBaseWithParam<std::string> Decode;
+typedef perf::TestBaseWithParam<std::string> Encode;
+
+const string exts[] = {
+#ifdef HAVE_AVIF
+    ".avif",
+#endif
+    ".bmp",
+#ifdef HAVE_IMGCODEC_GIF
+    ".gif",
+#endif
+#if (defined(HAVE_JASPER) && defined(OPENCV_IMGCODECS_ENABLE_JASPER_TESTS)) \
+    || defined(HAVE_OPENJPEG)
+    ".jp2",
+#endif
+#ifdef HAVE_JPEG
+    ".jpg",
+#endif
+#ifdef HAVE_JPEGXL
+    ".jxl",
+#endif
+    ".png",
+#ifdef HAVE_IMGCODEC_PXM
+    ".ppm",
+#endif
+#ifdef HAVE_IMGCODEC_SUNRASTER
+    ".ras",
+#endif
+#ifdef HAVE_TIFF
+    ".tiff",
+#endif
+#ifdef HAVE_WEBP
+    ".webp",
+#endif
+};
+
+const string exts_multi[] = {
+#ifdef HAVE_AVIF
+    ".avif",
+#endif
+#ifdef HAVE_IMGCODEC_GIF
+    ".gif",
+#endif
+    ".png",
+#ifdef HAVE_TIFF
+    ".tiff",
+#endif
+#ifdef HAVE_WEBP
+    ".webp",
+#endif
+};
+
+PERF_TEST_P(Decode, bgr, testing::ValuesIn(exts))
+{
+    String filename = getDataPath("perf/1920x1080.png");
+
+    Mat src = imread(filename);
+    EXPECT_FALSE(src.empty()) << "Cannot open test image perf/1920x1080.png";
+    vector<uchar> buf;
+    EXPECT_TRUE(imencode(GetParam(), src, buf));
+
+    TEST_CYCLE() imdecode(buf, IMREAD_UNCHANGED);
+
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST_P(Decode, rgb, testing::ValuesIn(exts))
+{
+    String filename = getDataPath("perf/1920x1080.png");
+
+    Mat src = imread(filename);
+    EXPECT_FALSE(src.empty()) << "Cannot open test image perf/1920x1080.png";
+    vector<uchar> buf;
+    EXPECT_TRUE(imencode(GetParam(), src, buf));
+
+    TEST_CYCLE() imdecode(buf, IMREAD_COLOR_RGB);
+
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST_P(Encode, bgr, testing::ValuesIn(exts))
+{
+    String filename = getDataPath("perf/1920x1080.png");
+
+    Mat src = imread(filename);
+    EXPECT_FALSE(src.empty()) << "Cannot open test image perf/1920x1080.png";
+    vector<uchar> buf;
+
+    TEST_CYCLE() imencode(GetParam(), src, buf);
+
+    std::cout << "Encoded buffer size: " << buf.size()
+        << " bytes, Compression ratio: " << std::fixed << std::setprecision(2)
+        << (static_cast<double>(buf.size()) / (src.total() * src.channels())) * 100.0 << "%" << std::endl;
+
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST_P(Encode, multi, testing::ValuesIn(exts_multi))
+{
+    String filename = getDataPath("perf/1920x1080.png");
+    vector<Mat> vec;
+    EXPECT_TRUE(imreadmulti(filename, vec));
+    vec.push_back(vec.back().clone());
+    circle(vec.back(), Point(100, 100), 45, Scalar(0, 0, 255, 0), 2, LINE_AA);
+    vector<uchar> buf;
+    EXPECT_TRUE(imwrite("test" + GetParam(), vec));
+
+    TEST_CYCLE() imencode(GetParam(), vec, buf);
+
+    std::cout << "Encoded buffer size: " << buf.size()
+        << " bytes, Compression ratio: " << std::fixed << std::setprecision(2)
+        << (static_cast<double>(buf.size()) / (vec[0].total() * vec[0].channels())) * 100.0 << "%" << std::endl;
+
+    SANITY_CHECK_NOTHING();
+}
+#endif // HAVE_PNG
+
+} // namespace

modules/imgcodecs/src/grfmt_avif.cpp

@@ -298,11 +298,6 @@ bool AvifEncoder::isFormatSupported(int depth) const {
   return (depth == CV_8U || depth == CV_16U);
 }
 
-bool AvifEncoder::write(const Mat &img, const std::vector<int> &params) {
-  std::vector<Mat> img_vec(1, img);
-  return writemulti(img_vec, params);
-}
-
 bool AvifEncoder::writeanimation(const Animation& animation,
                                  const std::vector<int> &params) {
   int bit_depth = 8;

modules/imgcodecs/src/grfmt_avif.hpp

@@ -41,7 +41,6 @@ class AvifEncoder CV_FINAL : public BaseImageEncoder {
   ~AvifEncoder() CV_OVERRIDE;
 
   bool isFormatSupported(int depth) const CV_OVERRIDE;
-  bool write(const Mat& img, const std::vector<int>& params) CV_OVERRIDE;
   bool writeanimation(const Animation& animation, const std::vector<int>& params) CV_OVERRIDE;
 
   ImageEncoder newEncoder() const CV_OVERRIDE;

modules/imgcodecs/src/grfmt_base.cpp

@@ -140,6 +140,11 @@ bool BaseImageEncoder::setDestination( std::vector<uchar>& buf )
     return true;
 }
 
+bool BaseImageEncoder::write(const Mat &img, const std::vector<int> &params) {
+    std::vector<Mat> img_vec(1, img);
+    return writemulti(img_vec, params);
+}
+
 bool BaseImageEncoder::writemulti(const std::vector<Mat>& img_vec, const std::vector<int>& params)
 {
     if(img_vec.size() > 1)
@@ -157,6 +162,7 @@ bool BaseImageEncoder::writemulti(const std::vector<Mat>& img_vec, const std::ve
 
 bool BaseImageEncoder::writeanimation(const Animation&, const std::vector<int>& )
 {
+    CV_LOG_WARNING(NULL, "No Animation encoder for specified file extension");
     return false;
 }
 
@@ -165,7 +171,7 @@ ImageEncoder BaseImageEncoder::newEncoder() const
     return ImageEncoder();
 }
 
-void BaseImageEncoder::throwOnEror() const
+void BaseImageEncoder::throwOnError() const
 {
     if(!m_last_error.empty())
     {

modules/imgcodecs/src/grfmt_base.hpp

@@ -202,12 +202,11 @@ public:
 
     /**
      * @brief Encode and write the image data.
-     * This is a pure virtual function that must be implemented by derived classes.
      * @param img The Mat object containing the image data to be encoded.
      * @param params A vector of parameters controlling the encoding process (e.g., compression level).
      * @return true if the image was successfully written, false otherwise.
      */
-    virtual bool write(const Mat& img, const std::vector<int>& params) = 0;
+    virtual bool write(const Mat& img, const std::vector<int>& params);
 
     /**
      * @brief Encode and write multiple images (e.g., for animated formats).
@@ -236,7 +235,7 @@ public:
      * @brief Throw an exception based on the last error encountered during encoding.
      * This method can be used to propagate error conditions back to the caller.
      */
-    virtual void throwOnEror() const;
+    virtual void throwOnError() const;
 
 protected:
     String m_description;    ///< Description of the encoder (e.g., format name, capabilities).

modules/imgcodecs/src/grfmt_gif.cpp

@@ -514,19 +514,11 @@ GifEncoder::~GifEncoder() {
     close();
 }
 
-bool GifEncoder::isFormatSupported(int depth) const {
-    return depth == CV_8U;
-}
-
-bool GifEncoder::write(const Mat &img, const std::vector<int> &params) {
-    std::vector<Mat> img_vec(1, img);
-    return writemulti(img_vec, params);
-}
-
 bool GifEncoder::writeanimation(const Animation& animation, const std::vector<int>& params) {
     if (animation.frames.empty()) {
         return false;
     }
+    CV_CheckDepthEQ(animation.frames[0].depth(), CV_8U, "GIF encoder supports only 8-bit unsigned images");
 
     if (m_buf) {
         if (!strm.open(*m_buf)) {

modules/imgcodecs/src/grfmt_gif.hpp

@@ -83,9 +83,6 @@ public:
     GifEncoder();
     ~GifEncoder() CV_OVERRIDE;
 
-    bool isFormatSupported(int depth) const CV_OVERRIDE;
-
-    bool write(const Mat& img, const std::vector<int>& params) CV_OVERRIDE;
     bool writeanimation(const Animation& animation, const std::vector<int>& params) CV_OVERRIDE;
 
     ImageEncoder newEncoder() const CV_OVERRIDE;

modules/imgcodecs/src/grfmt_png.cpp

@@ -1412,6 +1412,9 @@ void PngEncoder::deflateRectFin(unsigned char* zbuf, uint32_t* zsize, int bpp, i
 
 bool PngEncoder::writeanimation(const Animation& animation, const std::vector<int>& params)
 {
+    int frame_type = animation.frames[0].type();
+    int frame_depth = animation.frames[0].depth();
+    CV_CheckType(frame_type, frame_depth == CV_8U || frame_depth == CV_16U, "APNG decoder supports only 8 or 16 bit unsigned images");
     int compression_level = 6;
     int compression_strategy = IMWRITE_PNG_STRATEGY_RLE; // Default strategy
     bool isBilevel = false;
@@ -1435,7 +1438,8 @@ bool PngEncoder::writeanimation(const Animation& animation, const std::vector<in
         }
     }
 
-    CV_UNUSED(isBilevel);
+    if (isBilevel)
+        CV_LOG_WARNING(NULL, "IMWRITE_PNG_BILEVEL parameter is not supported yet.");
     uint32_t first =0;
     uint32_t loops= animation.loop_count;
     uint32_t coltype= animation.frames[0].channels() == 1 ? PNG_COLOR_TYPE_GRAY : animation.frames[0].channels() == 3 ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;

modules/imgcodecs/src/loadsave.cpp

@@ -1372,7 +1372,7 @@ bool imencode( const String& ext, InputArray _img,
         else
             code = encoder->writemulti(write_vec, params);
 
-        encoder->throwOnEror();
+        encoder->throwOnError();
         CV_Assert( code );
     }
     catch (const cv::Exception& e)