diff --git a/source/application/main/include/ImageUtils.hpp b/source/application/main/include/ImageUtils.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 IMAGE_UTILS_HPP
+#define IMAGE_UTILS_HPP
+
+#include <cstddef>
+#include <cstdint>
+#include <forward_list>
+#include <vector>
+
+/* Helper macro to convert RGB888 to RGB565 format. */
+#define RGB888_TO_RGB565(R8,G8,B8)  ((((R8>>3) & 0x1F) << 11) |     \
+                                     (((G8>>2) & 0x3F) << 5)  |     \
+                                     ((B8>>3) & 0x1F))
+
+constexpr uint16_t COLOR_BLACK  = 0;
+constexpr uint16_t COLOR_GREEN  = RGB888_TO_RGB565(  0, 255,  0); // 2016;
+constexpr uint16_t COLOR_YELLOW = RGB888_TO_RGB565(255, 255,  0); // 65504;
+
+
+namespace arm {
+namespace app {
+namespace image {
+
+    /**
+     * Contains the x,y co-ordinates of a box centre along with the box width and height.
+     */
+    struct Box {
+        float x;
+        float y;
+        float w;
+        float h;
+    };
+
+    struct Detection {
+        Box bbox;
+        std::vector<float> prob;
+        float objectness;
+    };
+
+    /**
+     * @brief       Calculate the 1D overlap.
+     * @param[in]   x1Center   First center point.
+     * @param[in]   width1     First width.
+     * @param[in]   x2Center   Second center point.
+     * @param[in]   width2     Second width.
+     * @return      The overlap between the two lines.
+     **/
+    float Calculate1DOverlap(float x1Center, float width1, float x2Center, float width2);
+
+    /**
+     * @brief       Calculate the intersection between the two given boxes.
+     * @param[in]   box1   First box.
+     * @param[in]   box2   Second box.
+     * @return      The intersection value.
+     **/
+    float CalculateBoxIntersect(Box& box1, Box& box2);
+
+    /**
+     * @brief       Calculate the union between the two given boxes.
+     * @param[in]   box1   First box.
+     * @param[in]   box2   Second box.
+     * @return      The two given boxes union value.
+     **/
+    float CalculateBoxUnion(Box& box1, Box& box2);
+
+    /**
+     * @brief       Calculate the intersection over union between the two given boxes.
+     * @param[in]   box1   First box.
+     * @param[in]   box2   Second box.
+     * @return      The intersection over union value.
+     **/
+    float CalculateBoxIOU(Box& box1, Box& box2);
+
+    /**
+     * @brief       Calculate the Non-Maxima suppression on the given detection boxes.
+     * @param[in]   detections    List of Detection boxes.
+     * @param[in]   classes       Number of classes.
+     * @param[in]   iouThreshold  Intersection over union threshold.
+     **/
+    void CalculateNMS(std::forward_list<Detection>& detections, int classes, float iouThreshold);
+
+    /**
+     * @brief           Helper function to convert a UINT8 image to INT8 format.
+     * @param[in,out]   data            Pointer to the data start.
+     * @param[in]       kMaxImageSize   Total number of pixels in the image.
+     **/
+    void ConvertImgToInt8(void* data, size_t kMaxImageSize);
+
+    /**
+     * @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, size_t dstImgSz);
+
+} /* namespace image */
+} /* namespace app */
+} /* namespace arm */
+
+#endif /* IMAGE_UTILS_HPP */
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