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The following commit(s) were added to refs/heads/vision by this push:
new f33654b [Image] add random lighting (#8779)
f33654b is described below
commit f33654b13b9cf16da42fe6fe6fe3d1d3e3cfe779
Author: Xingjian Shi <xsh...@ust.hk>
AuthorDate: Wed Nov 22 15:53:37 2017 -0800
[Image] add random lighting (#8779)
* add random lighting
* fix
---
python/mxnet/gluon/data/vision/transforms.py | 19 +++++
src/operator/image/image_random-inl.h | 95 +++++++++++++++++++++++++
src/operator/image/image_random.cc | 43 +++++++++--
tests/python/unittest/test_gluon_data_vision.py | 40 +++++++++++
4 files changed, 191 insertions(+), 6 deletions(-)
diff --git a/python/mxnet/gluon/data/vision/transforms.py
b/python/mxnet/gluon/data/vision/transforms.py
index e1deef6..931d644 100644
--- a/python/mxnet/gluon/data/vision/transforms.py
+++ b/python/mxnet/gluon/data/vision/transforms.py
@@ -21,6 +21,7 @@ from .. import dataset
from ...block import Block, HybridBlock
from ...nn import Sequential, HybridSequential
from .... import ndarray, initializer
+from ....base import _Null
class Compose(Sequential):
@@ -151,3 +152,21 @@ class RandomColorJitter(HybridBlock):
def hybrid_forward(self, F, x):
return F.image.random_color_jitter(x, *self._args)
+
+
+class AdjustLighting(HybridBlock):
+ def __init__(self, alpha_rgb=_Null, eigval=_Null, eigvec=_Null):
+ super(AdjustLighting, self).__init__()
+ self._args = (alpha_rgb, eigval, eigvec)
+
+ def hybrid_forward(self, F, x):
+ return F.image.adjust_lighting(x, *self._args)
+
+
+class RandomLighting(HybridBlock):
+ def __init__(self, alpha_std=_Null, eigval=_Null, eigvec=_Null):
+ super(RandomLighting, self).__init__()
+ self._args = (alpha_std, eigval, eigvec)
+
+ def hybrid_forward(self, F, x):
+ return F.image.random_lighting(x, *self._args)
\ No newline at end of file
diff --git a/src/operator/image/image_random-inl.h
b/src/operator/image/image_random-inl.h
index f823c8c..ebbf60a 100644
--- a/src/operator/image/image_random-inl.h
+++ b/src/operator/image/image_random-inl.h
@@ -26,6 +26,7 @@
#define MXNET_OPERATOR_IMAGE_IMAGE_RANDOM_INL_H_
#include <mxnet/base.h>
+#include <algorithm>
#include <vector>
#include <opencv2/opencv.hpp>
#include <opencv2/core/mat.hpp>
@@ -290,11 +291,105 @@ static void RandomColorJitter(const nnvm::NodeAttrs
&attrs,
const std::vector<TBlob> &outputs) {
}
+struct AdjustLightingParam : public dmlc::Parameter<AdjustLightingParam> {
+ nnvm::Tuple<float> alpha_rgb;
+ nnvm::Tuple<float> eigval;
+ nnvm::Tuple<float> eigvec;
+ DMLC_DECLARE_PARAMETER(AdjustLightingParam) {
+ DMLC_DECLARE_FIELD(alpha_rgb)
+ .set_default({0, 0, 0})
+ .describe("The lighting alphas for the R, G, B channels.");
+ DMLC_DECLARE_FIELD(eigval)
+ .describe("Eigen value.")
+ .set_default({ 55.46, 4.794, 1.148 });
+ DMLC_DECLARE_FIELD(eigvec)
+ .describe("Eigen vector.")
+ .set_default({ -0.5675, 0.7192, 0.4009,
+ -0.5808, -0.0045, -0.8140,
+ -0.5808, -0.0045, -0.8140 });
+ }
+};
+
+struct RandomLightingParam : public dmlc::Parameter<RandomLightingParam> {
+ float alpha_std;
+ nnvm::Tuple<float> eigval;
+ nnvm::Tuple<float> eigvec;
+ DMLC_DECLARE_PARAMETER(RandomLightingParam) {
+ DMLC_DECLARE_FIELD(alpha_std)
+ .set_default(0.05)
+ .describe("Level of the lighting noise.");
+ DMLC_DECLARE_FIELD(eigval)
+ .describe("Eigen value.")
+ .set_default({ 55.46, 4.794, 1.148 });
+ DMLC_DECLARE_FIELD(eigvec)
+ .describe("Eigen vector.")
+ .set_default({ -0.5675, 0.7192, 0.4009,
+ -0.5808, -0.0045, -0.8140,
+ -0.5808, -0.0045, -0.8140 });
+ }
+};
+
+void AdjustLightingImpl(uint8_t* dst, const uint8_t* src,
+ float alpha_r, float alpha_g, float alpha_b,
+ const nnvm::Tuple<float> eigval, const
nnvm::Tuple<float> eigvec,
+ int H, int W) {
+ alpha_r *= eigval[0];
+ alpha_g *= eigval[1];
+ alpha_b *= eigval[2];
+ float pca_r = alpha_r * eigvec[0] + alpha_g * eigvec[1] + alpha_b *
eigvec[2];
+ float pca_g = alpha_r * eigvec[3] + alpha_g * eigvec[4] + alpha_b *
eigvec[5];
+ float pca_b = alpha_r * eigvec[6] + alpha_g * eigvec[7] + alpha_b *
eigvec[8];
+ for (int i = 0; i < H * W; i++) {
+ int base_ind = 3 * i;
+ float in_r = static_cast<float>(src[base_ind]);
+ float in_g = static_cast<float>(src[base_ind + 1]);
+ float in_b = static_cast<float>(src[base_ind + 2]);
+ dst[base_ind] = std::min(255, std::max(0, static_cast<int>(in_r +
pca_r)));
+ dst[base_ind + 1] = std::min(255, std::max(0, static_cast<int>(in_g +
pca_g)));
+ dst[base_ind + 2] = std::min(255, std::max(0, static_cast<int>(in_b +
pca_b)));
+ }
+}
+
+static void AdjustLighting(const nnvm::NodeAttrs &attrs,
+ const OpContext &ctx,
+ const std::vector<TBlob> &inputs,
+ const std::vector<OpReqType> &req,
+ const std::vector<TBlob> &outputs) {
+ using namespace mshadow;
+ const AdjustLightingParam ¶m =
nnvm::get<AdjustLightingParam>(attrs.parsed);
+ CHECK_EQ(param.eigval.ndim(), 3) << "There should be 3 numbers in the
eigval.";
+ CHECK_EQ(param.eigvec.ndim(), 9) << "There should be 9 numbers in the
eigvec.";
+ CHECK_EQ(inputs[0].ndim(), 3);
+ CHECK_EQ(inputs[0].size(2), 3);
+ int H = inputs[0].size(0);
+ int W = inputs[0].size(1);
+ AdjustLightingImpl(outputs[0].dptr<uint8_t>(), inputs[0].dptr<uint8_t>(),
+ param.alpha_rgb[0], param.alpha_rgb[1],
param.alpha_rgb[2],
+ param.eigval, param.eigvec, H, W);
+}
+
static void RandomLighting(const nnvm::NodeAttrs &attrs,
const OpContext &ctx,
const std::vector<TBlob> &inputs,
const std::vector<OpReqType> &req,
const std::vector<TBlob> &outputs) {
+ using namespace mshadow;
+ const RandomLightingParam ¶m =
nnvm::get<RandomLightingParam>(attrs.parsed);
+ CHECK_EQ(param.eigval.ndim(), 3) << "There should be 3 numbers in the
eigval.";
+ CHECK_EQ(param.eigvec.ndim(), 9) << "There should be 9 numbers in the
eigvec.";
+ CHECK_EQ(inputs[0].ndim(), 3);
+ CHECK_EQ(inputs[0].size(2), 3);
+ int H = inputs[0].size(0);
+ int W = inputs[0].size(1);
+ Stream<cpu> *s = ctx.get_stream<cpu>();
+ Random<cpu> *prnd = ctx.requested[0].get_random<cpu, real_t>(s);
+ std::normal_distribution<float> dist(0, param.alpha_std);
+ float alpha_r = dist(prnd->GetRndEngine());
+ float alpha_g = dist(prnd->GetRndEngine());
+ float alpha_b = dist(prnd->GetRndEngine());
+ AdjustLightingImpl(outputs[0].dptr<uint8_t>(), inputs[0].dptr<uint8_t>(),
+ alpha_r, alpha_g, alpha_b,
+ param.eigval, param.eigvec, H, W);
}
diff --git a/src/operator/image/image_random.cc
b/src/operator/image/image_random.cc
index 7ff7328..5b47f50 100644
--- a/src/operator/image/image_random.cc
+++ b/src/operator/image/image_random.cc
@@ -35,9 +35,6 @@ NNVM_REGISTER_OP(_image_to_tensor)
.describe(R"code()code" ADD_FILELINE)
.set_num_inputs(1)
.set_num_outputs(1)
-.set_attr<FResourceRequest>("FResourceRequest", [](const NodeAttrs& attrs) {
- return std::vector<ResourceRequest>{ResourceRequest::kRandom};
-})
.set_attr<nnvm::FInferShape>("FInferShape", ToTensorShape)
.set_attr<nnvm::FInferType>("FInferType", ToTensorType)
.set_attr<FCompute>("FCompute<cpu>", ToTensor)
@@ -51,9 +48,6 @@ NNVM_REGISTER_OP(_image_normalize)
.set_num_inputs(1)
.set_num_outputs(1)
.set_attr_parser(ParamParser<NormalizeParam>)
-.set_attr<FResourceRequest>("FResourceRequest", [](const NodeAttrs& attrs) {
- return std::vector<ResourceRequest>{ResourceRequest::kRandom};
-})
.set_attr<nnvm::FInferShape>("FInferShape", ElemwiseShape<1, 1>)
.set_attr<nnvm::FInferType>("FInferType", ElemwiseType<1, 1>)
.set_attr<nnvm::FInplaceOption>("FInplaceOption",
@@ -126,5 +120,42 @@ NNVM_REGISTER_OP(_image_random_saturation)
.add_argument("data", "NDArray-or-Symbol", "The input.")
.add_arguments(RandomSaturationParam::__FIELDS__());
+DMLC_REGISTER_PARAMETER(AdjustLightingParam);
+NNVM_REGISTER_OP(_image_adjust_lighting)
+.describe(R"code(Adjust the lighting level of the input. Follow the AlexNet
style.)code" ADD_FILELINE)
+.set_num_inputs(1)
+.set_num_outputs(1)
+.set_attr_parser(ParamParser<AdjustLightingParam>)
+.set_attr<nnvm::FInferShape>("FInferShape", ElemwiseShape<1, 1>)
+.set_attr<nnvm::FInferType>("FInferType", ElemwiseType<1, 1>)
+.set_attr<nnvm::FInplaceOption>("FInplaceOption",
+ [](const NodeAttrs& attrs){
+ return std::vector<std::pair<int, int> >{{0, 0}};
+ })
+.set_attr<FCompute>("FCompute<cpu>", AdjustLighting)
+.set_attr<nnvm::FGradient>("FGradient", ElemwiseGradUseNone{ "_copy" })
+.add_argument("data", "NDArray-or-Symbol", "The input.")
+.add_arguments(AdjustLightingParam::__FIELDS__());
+
+DMLC_REGISTER_PARAMETER(RandomLightingParam);
+NNVM_REGISTER_OP(_image_random_lighting)
+.describe(R"code(Randomly add PCA noise. Follow the AlexNet style.)code"
ADD_FILELINE)
+.set_num_inputs(1)
+.set_num_outputs(1)
+.set_attr_parser(ParamParser<RandomLightingParam>)
+.set_attr<FResourceRequest>("FResourceRequest", [](const NodeAttrs& attrs) {
+ return std::vector<ResourceRequest>{ResourceRequest::kRandom};
+})
+.set_attr<nnvm::FInferShape>("FInferShape", ElemwiseShape<1, 1>)
+.set_attr<nnvm::FInferType>("FInferType", ElemwiseType<1, 1>)
+.set_attr<nnvm::FInplaceOption>("FInplaceOption",
+ [](const NodeAttrs& attrs){
+ return std::vector<std::pair<int, int> >{{0, 0}};
+ })
+.set_attr<FCompute>("FCompute<cpu>", RandomLighting)
+.set_attr<nnvm::FGradient>("FGradient", ElemwiseGradUseNone{ "_copy" })
+.add_argument("data", "NDArray-or-Symbol", "The input.")
+.add_arguments(RandomLightingParam::__FIELDS__());
+
} // namespace op
} // namespace mxnet
diff --git a/tests/python/unittest/test_gluon_data_vision.py
b/tests/python/unittest/test_gluon_data_vision.py
new file mode 100644
index 0000000..0c9e5c1
--- /dev/null
+++ b/tests/python/unittest/test_gluon_data_vision.py
@@ -0,0 +1,40 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you 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.
+from __future__ import print_function
+import mxnet as mx
+import mxnet.ndarray as nd
+import numpy as np
+from mxnet import gluon
+from mxnet.gluon.data.vision.transforms import AdjustLighting
+from mxnet.test_utils import assert_almost_equal
+
+def test_adjust_lighting():
+ data_in = np.random.uniform(0, 255, (300, 300, 3)).astype(dtype=np.uint8)
+ alpha_rgb = [0.05, 0.06, 0.07]
+ eigval = np.array([55.46, 4.794, 1.148])
+ eigvec = np.array([[-0.5675, 0.7192, 0.4009],
+ [-0.5808, -0.0045, -0.8140],
+ [-0.5808, -0.0045, -0.8140]])
+ f = AdjustLighting(alpha_rgb=alpha_rgb, eigval=eigval.ravel().tolist(),
eigvec=eigvec.ravel().tolist())
+ out_nd = f(nd.array(data_in, dtype=np.uint8))
+ out_gt = np.clip(data_in.astype(np.float32)
+ + np.dot(eigvec * alpha_rgb, eigval.reshape((3,
1))).reshape((1, 1, 3)), 0, 255).astype(np.uint8)
+ assert_almost_equal(out_nd.asnumpy(), out_gt)
+
+if __name__ == '__main__':
+ import nose
+ nose.runmodule()
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