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diff --git a/source/use_case/object_detection/include/DetectorPostProcessing.hpp b/source/use_case/object_detection/include/DetectorPostProcessing.hpp
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+++ b/source/use_case/object_detection/include/DetectorPostProcessing.hpp
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+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef DETECTOR_POST_PROCESSING_HPP
+#define DETECTOR_POST_PROCESSING_HPP
+
+#include "UseCaseCommonUtils.hpp"
+#include "DetectionResult.hpp"
+
+namespace arm {
+namespace app {
+
+#if DISPLAY_RGB_IMAGE
+#define FORMAT_MULTIPLY_FACTOR 3
+#else
+#define FORMAT_MULTIPLY_FACTOR 1
+#endif /* DISPLAY_RGB_IMAGE */
+
+    /**
+     * @brief       Post processing part of Yolo object detection CNN
+     * @param[in]   img_in        Pointer to the input image,detection bounding boxes drown on it.
+     * @param[in]   model_output  Output tesnsors after CNN invoked
+     * @param[out]  results_out   Vector of detected results.
+     * @return      void
+     **/
+void RunPostProcessing(uint8_t *img_in,TfLiteTensor* model_output[2],std::vector<arm::app::DetectionResult> & results_out);
+
+
+    /**
+     * @brief       Converts RGB image to grayscale
+     * @param[in]   rgb    Pointer to RGB input image
+     * @param[out]  gray   Pointer to RGB out image
+     * @param[in]   im_w   Input image width
+     * @param[in]   im_h   Input image height
+     * @return      void
+     **/
+void RgbToGrayscale(const uint8_t *rgb,uint8_t *gray, int im_w,int im_h);
+
+} /* namespace app */
+} /* namespace arm */
+
+#endif /* DETECTOR_POST_PROCESSING_HPP */