COMPMID-582: Add validation to channel_extract kernels.

Change-Id: I6413a05f6870a0d04f12d7348269b15297ae8493
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/114696
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>

8 files changed, 668 insertions, 18 deletions

diff --git a/tests/AssetsLibrary.h b/tests/AssetsLibrary.h
index 9c93ee0757..afdf714ff1 100644
--- a/tests/AssetsLibrary.h
+++ b/tests/AssetsLibrary.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2018 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -416,22 +416,24 @@ void AssetsLibrary::fill_borders_with_garbage(T &&tensor, D &&distribution, std:
 template <typename T, typename D>
 void AssetsLibrary::fill(T &&tensor, D &&distribution, std::random_device::result_type seed_offset) const
 {
-    Window window;
-    for(unsigned int d = 0; d < tensor.shape().num_dimensions(); ++d)
-    {
-        window.set(d, Window::Dimension(0, tensor.shape()[d], 1));
-    }
+    using ResultType = typename std::remove_reference<D>::type::result_type;
 
     std::mt19937 gen(_seed + seed_offset);
 
-    //FIXME: Replace with normal loop
-    execute_window_loop(window, [&](const Coordinates & id)
+    // Iterate over all elements
+    for(int element_idx = 0; element_idx < tensor.num_elements(); ++element_idx)
     {
-        using ResultType         = typename std::remove_reference<D>::type::result_type;
-        const ResultType value   = distribution(gen);
-        void *const      out_ptr = tensor(id);
-        store_value_with_data_type(out_ptr, value, tensor.data_type());
-    });
+        const Coordinates id = index2coord(tensor.shape(), element_idx);
+
+        // Iterate over all channels
+        for(int channel = 0; channel < tensor.num_channels(); ++channel)
+        {
+            const ResultType value        = distribution(gen);
+            ResultType      &target_value = reinterpret_cast<ResultType *const>(tensor(id))[channel];
+
+            store_value_with_data_type(&target_value, value, tensor.data_type());
+        }
+    }
 
     fill_borders_with_garbage(tensor, distribution, seed_offset);
 }
diff --git a/tests/SimpleTensor.h b/tests/SimpleTensor.h
index 902f5b51b5..f3155ffeab 100644
--- a/tests/SimpleTensor.h
+++ b/tests/SimpleTensor.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2018 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -297,18 +297,33 @@ int SimpleTensor<T>::num_channels() const
     switch(_format)
     {
         case Format::U8:
-        case Format::S16:
         case Format::U16:
-        case Format::S32:
+        case Format::S16:
         case Format::U32:
+        case Format::S32:
+        case Format::F16:
         case Format::F32:
             return 1;
+        // Because the U and V channels are subsampled
+        // these formats appear like having only 2 channels:
+        case Format::YUYV422:
+        case Format::UYVY422:
+            return 2;
+        case Format::UV88:
+            return 2;
         case Format::RGB888:
             return 3;
+        case Format::RGBA8888:
+            return 4;
         case Format::UNKNOWN:
             return _num_channels;
+        //Doesn't make sense for planar formats:
+        case Format::NV12:
+        case Format::NV21:
+        case Format::IYUV:
+        case Format::YUV444:
         default:
-            ARM_COMPUTE_ERROR("NOT SUPPORTED!");
+            return 0;
     }
 }
 
diff --git a/tests/Utils.h b/tests/Utils.h
index 750d907778..27e0397b6b 100644
--- a/tests/Utils.h
+++ b/tests/Utils.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2018 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -500,6 +500,22 @@ inline T create_tensor(const TensorShape &shape, Format format)
     return tensor;
 }
 
+/** Create and initialize a multi-image of the given type.
+ *
+ * @param[in] shape  Tensor shape.
+ * @param[in] format Format type.
+ *
+ * @return Initialized tensor of given type.
+ */
+template <typename T>
+inline T create_multi_image(const TensorShape &shape, Format format)
+{
+    T multi_image;
+    multi_image.init(shape.x(), shape.y(), format);
+
+    return multi_image;
+}
+
 /** Create and initialize a HOG (Histogram of Oriented Gradients) of the given type.
  *
  * @param[in] cell_size             Cell size in pixels
diff --git a/tests/validation/CL/ChannelExtract.cpp b/tests/validation/CL/ChannelExtract.cpp
new file mode 100644
index 0000000000..1248a2072d
--- /dev/null
+++ b/tests/validation/CL/ChannelExtract.cpp
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2017-2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/core/Types.h"
+#include "arm_compute/runtime/CL/CLMultiImage.h"
+#include "arm_compute/runtime/CL/CLTensor.h"
+#include "arm_compute/runtime/CL/CLTensorAllocator.h"
+#include "arm_compute/runtime/CL/functions/CLChannelExtract.h"
+#include "tests/CL/CLAccessor.h"
+#include "tests/PaddingCalculator.h"
+#include "tests/datasets/ConvertPolicyDataset.h"
+#include "tests/datasets/ShapeDatasets.h"
+#include "tests/framework/Asserts.h"
+#include "tests/framework/Macros.h"
+#include "tests/framework/datasets/Datasets.h"
+#include "tests/validation/Validation.h"
+#include "tests/validation/fixtures/ChannelExtractFixture.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace
+{
+// Input data sets
+const auto ChannelExtractRGBADataset = combine(framework::dataset::make("FormatType", { Format::RGBA8888 }),
+                                               framework::dataset::make("ChannelType", { Channel::R, Channel::G, Channel::B, Channel::A }));
+const auto ChannelExtractYUVDataset = combine(framework::dataset::make("FormatType", { Format::YUYV422, Format::UYVY422 }),
+                                              framework::dataset::make("ChannelType", { Channel::Y, Channel::U, Channel::V }));
+const auto ChannelExtractYUVPlanarDataset = combine(framework::dataset::make("FormatType", { Format::IYUV, Format::YUV444, Format::NV12, Format::NV21 }),
+                                                    framework::dataset::make("ChannelType", { Channel::Y, Channel::U, Channel::V }));
+
+inline void validate_configuration(const TensorShape &shape, Format format, Channel channel)
+{
+    const unsigned int num_planes = num_planes_from_format(format);
+
+    TensorShape dst_shape = adjust_odd_shape(shape, format);
+    dst_shape             = calculate_subsampled_shape(dst_shape, format, channel);
+
+    // Create tensors
+    CLMultiImage ref_src = create_multi_image<CLMultiImage>(shape, format);
+    CLTensor     dst     = create_tensor<CLTensor>(dst_shape, Format::U8);
+
+    // Create and Configure function
+    CLChannelExtract channel_extract;
+
+    if(1U == num_planes)
+    {
+        const CLTensor *plane_src = ref_src.cl_plane(0);
+
+        channel_extract.configure(plane_src, channel, &dst);
+    }
+    else
+    {
+        channel_extract.configure(&ref_src, channel, &dst);
+    }
+
+    // TODO(bsgcomp): Add validation for padding and shape (COMPMID-659)
+}
+} // namespace
+
+TEST_SUITE(CL)
+TEST_SUITE(ChannelExtract)
+
+template <typename T>
+using CLChannelExtractFixture = ChannelExtractValidationFixture<CLMultiImage, CLTensor, CLAccessor, CLChannelExtract, T>;
+
+TEST_SUITE(Configuration)
+DATA_TEST_CASE(RGBA, framework::DatasetMode::ALL, combine(concat(datasets::Small2DShapes(), datasets::Large2DShapes()), ChannelExtractRGBADataset),
+               shape, format, channel)
+{
+    validate_configuration(shape, format, channel);
+}
+DATA_TEST_CASE(YUV, framework::DatasetMode::ALL, combine(concat(datasets::Small2DShapes(), datasets::Large2DShapes()), ChannelExtractYUVDataset),
+               shape, format, channel)
+{
+    validate_configuration(shape, format, channel);
+}
+
+DATA_TEST_CASE(YUVPlanar, framework::DatasetMode::ALL, combine(concat(datasets::Small2DShapes(), datasets::Large2DShapes()), ChannelExtractYUVPlanarDataset),
+               shape, format, channel)
+{
+    validate_configuration(shape, format, channel);
+}
+TEST_SUITE_END()
+
+TEST_SUITE(RGBA)
+FIXTURE_DATA_TEST_CASE(RunSmall, CLChannelExtractFixture<uint8_t>, framework::DatasetMode::PRECOMMIT, combine(datasets::Small2DShapes(), ChannelExtractRGBADataset))
+{
+    // Validate output
+    validate(CLAccessor(_target), _reference);
+}
+FIXTURE_DATA_TEST_CASE(RunLarge, CLChannelExtractFixture<uint8_t>, framework::DatasetMode::NIGHTLY, combine(datasets::Large2DShapes(), ChannelExtractRGBADataset))
+{
+    // Validate output
+    validate(CLAccessor(_target), _reference);
+}
+TEST_SUITE_END()
+
+TEST_SUITE(YUV)
+FIXTURE_DATA_TEST_CASE(RunSmall, CLChannelExtractFixture<uint8_t>, framework::DatasetMode::PRECOMMIT, combine(datasets::Small2DShapes(), ChannelExtractYUVDataset))
+{
+    // Validate output
+    validate(CLAccessor(_target), _reference);
+}
+FIXTURE_DATA_TEST_CASE(RunLarge, CLChannelExtractFixture<uint8_t>, framework::DatasetMode::NIGHTLY, combine(datasets::Large2DShapes(), ChannelExtractYUVDataset))
+{
+    // Validate output
+    validate(CLAccessor(_target), _reference);
+}
+TEST_SUITE_END()
+
+TEST_SUITE(YUVPlanar)
+FIXTURE_DATA_TEST_CASE(RunSmall, CLChannelExtractFixture<uint8_t>, framework::DatasetMode::PRECOMMIT, combine(datasets::Small2DShapes(), ChannelExtractYUVPlanarDataset))
+{
+    // Validate output
+    validate(CLAccessor(_target), _reference);
+}
+FIXTURE_DATA_TEST_CASE(RunLarge, CLChannelExtractFixture<uint8_t>, framework::DatasetMode::NIGHTLY, combine(datasets::Large2DShapes(), ChannelExtractYUVPlanarDataset))
+{
+    // Validate output
+    validate(CLAccessor(_target), _reference);
+}
+TEST_SUITE_END()
+
+TEST_SUITE_END()
+TEST_SUITE_END()
+
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
diff --git a/tests/validation/NEON/ChannelExtract.cpp b/tests/validation/NEON/ChannelExtract.cpp
new file mode 100644
index 0000000000..4d8599a21d
--- /dev/null
+++ b/tests/validation/NEON/ChannelExtract.cpp
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2017-2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/core/Types.h"
+#include "arm_compute/runtime/MultiImage.h"
+#include "arm_compute/runtime/NEON/functions/NEChannelExtract.h"
+#include "arm_compute/runtime/Tensor.h"
+#include "arm_compute/runtime/TensorAllocator.h"
+#include "tests/NEON/Accessor.h"
+#include "tests/PaddingCalculator.h"
+#include "tests/datasets/ConvertPolicyDataset.h"
+#include "tests/datasets/ShapeDatasets.h"
+#include "tests/framework/Asserts.h"
+#include "tests/framework/Macros.h"
+#include "tests/framework/datasets/Datasets.h"
+#include "tests/validation/Validation.h"
+#include "tests/validation/fixtures/ChannelExtractFixture.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace
+{
+// Input data sets
+const auto ChannelExtractRGBADataset = combine(framework::dataset::make("FormatType", { Format::RGBA8888 }),
+                                               framework::dataset::make("ChannelType", { Channel::R, Channel::G, Channel::B, Channel::A }));
+const auto ChannelExtractYUVDataset = combine(framework::dataset::make("FormatType", { Format::YUYV422, Format::UYVY422 }),
+                                              framework::dataset::make("ChannelType", { Channel::Y, Channel::U, Channel::V }));
+const auto ChannelExtractYUVPlanarDataset = combine(framework::dataset::make("FormatType", { Format::IYUV, Format::YUV444, Format::NV12, Format::NV21 }),
+                                                    framework::dataset::make("ChannelType", { Channel::Y, Channel::U, Channel::V }));
+
+inline void validate_configuration(const TensorShape &shape, Format format, Channel channel)
+{
+    const unsigned int num_planes = num_planes_from_format(format);
+
+    TensorShape dst_shape = adjust_odd_shape(shape, format);
+    dst_shape             = calculate_subsampled_shape(dst_shape, format, channel);
+
+    // Create tensors
+    MultiImage ref_src = create_multi_image<MultiImage>(shape, format);
+    Tensor     dst     = create_tensor<Tensor>(dst_shape, Format::U8);
+
+    // Create and Configure function
+    NEChannelExtract channel_extract;
+
+    if(1U == num_planes)
+    {
+        const Tensor *plane_src = ref_src.plane(0);
+
+        channel_extract.configure(plane_src, channel, &dst);
+    }
+    else
+    {
+        channel_extract.configure(&ref_src, channel, &dst);
+    }
+
+    // TODO(bsgcomp): Add validation for padding and shape (COMPMID-659)
+}
+} // namespace
+
+TEST_SUITE(NEON)
+TEST_SUITE(ChannelExtract)
+
+template <typename T>
+using NEChannelExtractFixture = ChannelExtractValidationFixture<MultiImage, Tensor, Accessor, NEChannelExtract, T>;
+
+TEST_SUITE(Configuration)
+DATA_TEST_CASE(RGBA, framework::DatasetMode::ALL, combine(concat(datasets::Small2DShapes(), datasets::Large2DShapes()), ChannelExtractRGBADataset),
+               shape, format, channel)
+{
+    validate_configuration(shape, format, channel);
+}
+DATA_TEST_CASE(YUV, framework::DatasetMode::ALL, combine(concat(datasets::Small2DShapes(), datasets::Large2DShapes()), ChannelExtractYUVDataset),
+               shape, format, channel)
+{
+    validate_configuration(shape, format, channel);
+}
+
+DATA_TEST_CASE(YUVPlanar, framework::DatasetMode::ALL, combine(concat(datasets::Small2DShapes(), datasets::Large2DShapes()), ChannelExtractYUVPlanarDataset),
+               shape, format, channel)
+{
+    validate_configuration(shape, format, channel);
+}
+TEST_SUITE_END()
+
+TEST_SUITE(RGBA)
+FIXTURE_DATA_TEST_CASE(RunSmall, NEChannelExtractFixture<uint8_t>, framework::DatasetMode::PRECOMMIT, combine(datasets::Small2DShapes(), ChannelExtractRGBADataset))
+{
+    // Validate output
+    validate(Accessor(_target), _reference);
+}
+FIXTURE_DATA_TEST_CASE(RunLarge, NEChannelExtractFixture<uint8_t>, framework::DatasetMode::NIGHTLY, combine(datasets::Large2DShapes(), ChannelExtractRGBADataset))
+{
+    // Validate output
+    validate(Accessor(_target), _reference);
+}
+TEST_SUITE_END()
+
+TEST_SUITE(YUV)
+FIXTURE_DATA_TEST_CASE(RunSmall, NEChannelExtractFixture<uint8_t>, framework::DatasetMode::PRECOMMIT, combine(datasets::Small2DShapes(), ChannelExtractYUVDataset))
+{
+    // Validate output
+    validate(Accessor(_target), _reference);
+}
+FIXTURE_DATA_TEST_CASE(RunLarge, NEChannelExtractFixture<uint8_t>, framework::DatasetMode::NIGHTLY, combine(datasets::Large2DShapes(), ChannelExtractYUVDataset))
+{
+    // Validate output
+    validate(Accessor(_target), _reference);
+}
+TEST_SUITE_END()
+
+TEST_SUITE(YUVPlanar)
+FIXTURE_DATA_TEST_CASE(RunSmall, NEChannelExtractFixture<uint8_t>, framework::DatasetMode::PRECOMMIT, combine(datasets::Small2DShapes(), ChannelExtractYUVPlanarDataset))
+{
+    // Validate output
+    validate(Accessor(_target), _reference);
+}
+FIXTURE_DATA_TEST_CASE(RunLarge, NEChannelExtractFixture<uint8_t>, framework::DatasetMode::NIGHTLY, combine(datasets::Large2DShapes(), ChannelExtractYUVPlanarDataset))
+{
+    // Validate output
+    validate(Accessor(_target), _reference);
+}
+TEST_SUITE_END()
+
+TEST_SUITE_END()
+TEST_SUITE_END()
+
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
diff --git a/tests/validation/fixtures/ChannelExtractFixture.h b/tests/validation/fixtures/ChannelExtractFixture.h
new file mode 100644
index 0000000000..c3c2e17d09
--- /dev/null
+++ b/tests/validation/fixtures/ChannelExtractFixture.h
@@ -0,0 +1,192 @@
+/*
+ * Copyright (c) 2017-2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef ARM_COMPUTE_TEST_CHANNEL_EXTRACT_FIXTURE
+#define ARM_COMPUTE_TEST_CHANNEL_EXTRACT_FIXTURE
+
+#include "arm_compute/core/TensorShape.h"
+#include "arm_compute/core/Types.h"
+#include "tests/AssetsLibrary.h"
+#include "tests/Globals.h"
+#include "tests/IAccessor.h"
+#include "tests/framework/Asserts.h"
+#include "tests/framework/Fixture.h"
+#include "tests/validation/Helpers.h"
+#include "tests/validation/reference/ChannelExtract.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+template <typename MultiImageType, typename TensorType, typename AccessorType, typename FunctionType, typename T>
+class ChannelExtractValidationFixture : public framework::Fixture
+{
+public:
+    template <typename...>
+    void setup(TensorShape shape, Format format, Channel channel)
+    {
+        shape = adjust_odd_shape(shape, format);
+
+        _target    = compute_target(shape, format, channel);
+        _reference = compute_reference(shape, format, channel);
+    }
+
+protected:
+    template <typename U>
+    void fill(U &&tensor, int i)
+    {
+        library->fill_tensor_uniform(tensor, i);
+    }
+
+    std::vector<SimpleTensor<T>> create_tensor_planes_reference(const TensorShape &shape, Format format)
+    {
+        TensorShape input = adjust_odd_shape(shape, format);
+
+        std::vector<SimpleTensor<T>> tensor_planes;
+
+        switch(format)
+        {
+            case Format::RGB888:
+            case Format::RGBA8888:
+            case Format::YUYV422:
+            case Format::UYVY422:
+            {
+                tensor_planes.emplace_back(input, format);
+                break;
+            }
+            case Format::NV12:
+            case Format::NV21:
+            {
+                const TensorShape shape_uv88 = calculate_subsampled_shape(shape, Format::UV88);
+
+                tensor_planes.emplace_back(input, Format::U8);
+                tensor_planes.emplace_back(shape_uv88, Format::UV88);
+                break;
+            }
+            case Format::IYUV:
+            {
+                const TensorShape shape_sub2 = calculate_subsampled_shape(shape, Format::IYUV);
+
+                tensor_planes.emplace_back(input, Format::U8);
+                tensor_planes.emplace_back(shape_sub2, Format::U8);
+                tensor_planes.emplace_back(shape_sub2, Format::U8);
+                break;
+            }
+            case Format::YUV444:
+                tensor_planes.emplace_back(input, Format::U8);
+                tensor_planes.emplace_back(input, Format::U8);
+                tensor_planes.emplace_back(input, Format::U8);
+                break;
+            default:
+                ARM_COMPUTE_ERROR("Not supported");
+                break;
+        }
+
+        return tensor_planes;
+    }
+
+    TensorType compute_target(const TensorShape &shape, Format format, Channel channel)
+    {
+        const unsigned int num_planes = num_planes_from_format(format);
+
+        TensorShape dst_shape = calculate_subsampled_shape(shape, format, channel);
+
+        // Create tensors
+        MultiImageType ref_src = create_multi_image<MultiImageType>(shape, format);
+        TensorType     dst     = create_tensor<TensorType>(dst_shape, Format::U8);
+
+        // Create and configure function
+        FunctionType channel_extract;
+
+        if(1U == num_planes)
+        {
+            const TensorType *plane_src = static_cast<TensorType *>(ref_src.plane(0));
+
+            channel_extract.configure(plane_src, channel, &dst);
+        }
+        else
+        {
+            channel_extract.configure(&ref_src, channel, &dst);
+        }
+
+        for(unsigned int plane_idx = 0; plane_idx < num_planes; ++plane_idx)
+        {
+            const TensorType *src_plane = static_cast<const TensorType *>(ref_src.plane(plane_idx));
+
+            ARM_COMPUTE_EXPECT(src_plane->info()->is_resizable(), framework::LogLevel::ERRORS);
+        }
+
+        ARM_COMPUTE_EXPECT(dst.info()->is_resizable(), framework::LogLevel::ERRORS);
+
+        // Allocate tensors
+        ref_src.allocate();
+        dst.allocator()->allocate();
+
+        for(unsigned int plane_idx = 0; plane_idx < num_planes; ++plane_idx)
+        {
+            const TensorType *src_plane = static_cast<const TensorType *>(ref_src.plane(plane_idx));
+
+            ARM_COMPUTE_EXPECT(!src_plane->info()->is_resizable(), framework::LogLevel::ERRORS);
+        }
+
+        ARM_COMPUTE_EXPECT(!dst.info()->is_resizable(), framework::LogLevel::ERRORS);
+
+        // Fill tensor planes
+        for(unsigned int plane_idx = 0; plane_idx < num_planes; ++plane_idx)
+        {
+            TensorType *src_plane = static_cast<TensorType *>(ref_src.plane(plane_idx));
+
+            fill(AccessorType(*src_plane), plane_idx);
+        }
+
+        // Compute function
+        channel_extract.run();
+
+        return dst;
+    }
+
+    SimpleTensor<T> compute_reference(const TensorShape &shape, Format format, Channel channel)
+    {
+        const unsigned int num_planes = num_planes_from_format(format);
+
+        // Create reference
+        std::vector<SimpleTensor<T>> ref_src = create_tensor_planes_reference(shape, format);
+
+        // Fill references
+        for(unsigned int plane_idx = 0; plane_idx < num_planes; ++plane_idx)
+        {
+            fill(ref_src[plane_idx], plane_idx);
+        }
+
+        return reference::channel_extract<T>(shape, ref_src, format, channel);
+    }
+
+    TensorType      _target{};
+    SimpleTensor<T> _reference{};
+};
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_TEST_CHANNEL_EXTRACT_FIXTURE */
diff --git a/tests/validation/reference/ChannelExtract.cpp b/tests/validation/reference/ChannelExtract.cpp
new file mode 100644
index 0000000000..595bb13098
--- /dev/null
+++ b/tests/validation/reference/ChannelExtract.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2017-2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "ChannelExtract.h"
+
+#include "arm_compute/core/Types.h"
+#include "tests/validation/FixedPoint.h"
+#include "tests/validation/Helpers.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace reference
+{
+template <typename T>
+SimpleTensor<uint8_t> channel_extract(const TensorShape &shape, const std::vector<SimpleTensor<T>> &tensor_planes, Format format, Channel channel)
+{
+    // Find plane and channel index
+    const unsigned int plane_idx   = plane_idx_from_channel(format, channel);
+    const unsigned int channel_idx = channel_idx_from_format(format, channel);
+
+    // Create dst and get src tensor
+    SimpleTensor<T> src = tensor_planes[plane_idx];
+    SimpleTensor<T> dst{ calculate_subsampled_shape(shape, format, channel), Format::U8 };
+
+    // Single planar formats with subsampling require a double horizontal step
+    const int step_x = ((Format::YUYV422 == format || Format::UYVY422 == format) && Channel::Y != channel) ? 2 : 1;
+    const int width  = dst.shape().x();
+    const int height = dst.shape().y();
+
+    // Loop over each pixel and extract channel
+    for(int y = 0; y < height; ++y)
+    {
+        for(int x = 0; x < width; ++x)
+        {
+            const Coordinates src_coord{ x * step_x, y };
+            const Coordinates dst_coord{ x, y };
+
+            const auto *src_pixel = reinterpret_cast<const T *>(src(src_coord));
+            auto       *dst_pixel = reinterpret_cast<T *>(dst(dst_coord));
+
+            dst_pixel[0] = src_pixel[channel_idx];
+        }
+    }
+
+    return dst;
+}
+
+template SimpleTensor<uint8_t> channel_extract(const TensorShape &shape, const std::vector<SimpleTensor<uint8_t>> &tensor_planes, Format format, Channel channel);
+} // namespace reference
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
diff --git a/tests/validation/reference/ChannelExtract.h b/tests/validation/reference/ChannelExtract.h
new file mode 100644
index 0000000000..ac7aefbdee
--- /dev/null
+++ b/tests/validation/reference/ChannelExtract.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2017-2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_TEST_CHANNEL_EXTRACT_H__
+#define __ARM_COMPUTE_TEST_CHANNEL_EXTRACT_H__
+
+#include "tests/SimpleTensor.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace reference
+{
+template <typename T>
+SimpleTensor<uint8_t> channel_extract(const TensorShape &shape, const std::vector<SimpleTensor<T>> &tensor_planes, Format format, Channel channel);
+} // namespace reference
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_TEST_CHANNEL_EXTRACT_H__ */