2 files changed, 24 insertions, 2 deletions
diff --git a/source/application/main/UseCaseCommonUtils.cc b/source/application/main/UseCaseCommonUtils.cc
index d740d10..67e784b 100644
--- a/source/application/main/UseCaseCommonUtils.cc
+++ b/source/application/main/UseCaseCommonUtils.cc
@@ -91,6 +91,20 @@ bool image::PresentInferenceResult(
     return true;
 }
 
+void image::RgbToGrayscale(const uint8_t *srcPtr, uint8_t *dstPtr, const size_t dstImgSz)
+{
+    float R=0.299;
+    float G=0.587;
+    float B=0.114;
+    for (size_t i = 0; i < dstImgSz; ++i, srcPtr += 3) {
+        uint32_t  int_gray = R * (*srcPtr) +
+                             G * (*(srcPtr + 1)) +
+                             B * (*(srcPtr + 2));
+        *dstPtr++ = int_gray <= std::numeric_limits<uint8_t>::max() ?
+                        int_gray : std::numeric_limits<uint8_t>::max();
+    }
+}
+
 void IncrementAppCtxIfmIdx(arm::app::ApplicationContext& ctx, std::string useCase)
 {
 #if NUMBER_OF_FILES > 0
@@ -227,4 +241,4 @@ bool ListFilesHandler(ApplicationContext& ctx)
 }
 
 } /* namespace app */
-} /* namespace arm */
-\ No newline at end of file
+} /* namespace arm */
diff --git a/source/application/main/include/UseCaseCommonUtils.hpp b/source/application/main/include/UseCaseCommonUtils.hpp
index c91dc4a..84b5de3 100644
--- a/source/application/main/include/UseCaseCommonUtils.hpp
+++ b/source/application/main/include/UseCaseCommonUtils.hpp
@@ -57,7 +57,15 @@ namespace image{
    **/
   bool PresentInferenceResult(hal_platform & platform,
     const std::vector < arm::app::ClassificationResult > & results);
-  }
+
+  /**
+   * @brief       Converts RGB image to grayscale.
+   * @param[in]   srcPtr   Pointer to RGB source image.
+   * @param[out]  dstPtr   Pointer to grayscale destination image.
+   * @param[in]   imgSz    Destination image size.
+   **/
+  void RgbToGrayscale(const uint8_t *srcPtr, uint8_t *dstPtr, const size_t dstImgSz);
+}
 
 /**
    * @brief           Helper function to increment current input feature vector index.