CN107886073A - A kind of more attribute recognition approaches of fine granularity vehicle based on convolutional neural networks - Google Patents
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Abstract
Description
Claims (6)
- A kind of 1. more attribute recognition approaches of fine granularity vehicle based on convolutional neural networks, it is characterised in that:This method include with Lower step:S1:Build the neutral net hierarchical structure of multi-task learning;S2:Using the vehicle data collection of the fine granularity image classification comprising different vehicle attribute, neutral net, study are trained Triplet Loss and Softmax Loss associated losses are so as to carrying out the adjustment of weight parameter matrix and bias;S3:By the weight parameter matrix and bias in the obtained each layer trained, accordingly it is assigned in neutral net Each layer, for vehicle characteristics extraction and the more Attribute Recognitions of vehicle.
- 2. a kind of more attribute recognition approaches of fine granularity vehicle based on convolutional neural networks according to claim 1, it is special Sign is:The neutral net hierarchical structure includes input layer, convolutional layer, activation primitive layer, normalization layer, pond layer, full connection Layer, slicing layer and classification output layer, wherein, input layer includes original image input layer and label data input layer;Convolutional layer, swash Function layer, normalization layer, pond layer and full articulamentum living are responsible for vehicle characteristics extraction;Slicing layer is responsible for label data section;Point Class layer is responsible for output category result.
- 3. a kind of more attribute recognition approaches of fine granularity vehicle based on convolutional neural networks according to claim 1, it is special Sign is:The step 2 is specially:Cutting is carried out to label data using slicing layer, label data enters with image feature data Row classification learning, different attribute tasks is completed by the associated losses for learning different attribute;Each learning tasks share hidden layer, The inner link of different attribute study is excavated, distinguishes the difference between learning tasks again;For the different attribute of vehicle, it is determined that Different learning tasks, each learning tasks learn an attribute of vehicle, and vehicle attribute is identified;To vehicle Each attribute enters row label mark, obtains more attribute tags data;The multi-task learning multiple tasks collateral learning, as a result influences each other once to learn multiple tasks;The vehicle attribute includes vehicle brand, vehicle, the vehicle adeditive attribute of color;The training method of the training neutral net is the supervised learning of the data of tape label;The output that the Triplet Loss are triple network structure Triplet Network is lost, the Softmax Loss is the output loss of Softmax regression functions;Wherein triple network structure belongs to metric learning, is by training and learning Practise, reduce the distance between similar sample, while increase the distance between different classes of sample;The fine granularity image classification is for coarseness is classified, for identifying under similar categorization between different subclasses Nuance.
- 4. a kind of more attribute recognition approaches of fine granularity vehicle based on convolutional neural networks according to claim 1 or 2, its It is characterised by:The neutral net hierarchical structure includes 2 input layers, 5 convolutional layers, 5 activation primitive layers, 2 normalization layers, 3 Pond layer, 3 full articulamentums, 1 slicing layer and some classification output layers;Wherein, first convolutional layer is 11x11x3 using 96 sizes, and step-length is the convolution kernel of 4 pixels, is to size 224x224x3 input picture carries out convolutional filtering;Second layer convolutional layer is in response to normalization and Chi Huahou result using the output of first convolutional layer as inputting, and It is filtered using the convolution kernel that 256 sizes are 5x5x48;Three, the 4th and the 5th convolutional layers are connected with each other, not between any pond layer with normalizing among layer;The convolution kernel that 3rd convolutional layer has 384 sizes to be 3x3x256 is connected to the output of second convolutional layer, is normalization , Chi Huahou result;4th convolutional layer possesses the core that 384 sizes are 3x3x192;5th convolutional layer possesses the core that 256 sizes are 3x3x192;Pond layer uses size as 3, and step-length is 2 pond window, using overlapping pool strategy;Activation primitive layer is applied to the output of each convolutional layer and full articulamentum, using unsaturated nonlinear function f (x)=max (0, x) solves nonlinear problem;The output of hidden neuron is arranged to zero by dropout layers with 0.5 probability, wherein Dropout layers are that it is temporarily abandoned neutral net unit to according to certain probability from network, avoid training plan with this Close the mechanism that phenomenon occurs and design;Full articulamentum has 4096 neurons, for the classification in whole convolutional neural networks.
- 5. a kind of more attribute recognition approaches of fine granularity vehicle based on convolutional neural networks according to claim 4, it is special Sign is:In the neutral net hierarchical structure, the input of input layer includes raw image data and more attribute tags data, Wherein raw image data input raw image data, more more attribute tags data of attribute tags data input;This layer of input data is split into N number of branch in the full articulamentum of last layer, wherein N is the vehicle attribute for needing to learn Number;There is data slicer layer after more attribute tags data input layers, label data cutting is cut into slices for N number of label, each label Section possesses an attribute mark, and wherein N is the vehicle attribute number for needing to learn;By the raw image data after division and label section combination learning, the classification results of each attribute of final output.
- 6. a kind of more attribute recognition approaches of fine granularity vehicle based on convolutional neural networks according to claim 3, it is special Sign is:The learning method of the associated losses is:It is N to define for the data image number of training, and classification number is C, note image riLabel classification be li, it is designated as Wherein i=1 ... N, f (ri, c) and it is classification c in the output of last layer of full articulamentum, c=1 ..., C, then all training images {ri}iNegative log-likelihood sum is defined as in the Softmax loss outputs of last layer of full articulamentum:<mrow> <msub> <mi>L</mi> <mrow> <mi>s</mi> <mi>o</mi> <mi>f</mi> <mi>t</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <mo>-</mo> <mi>l</mi> <mi>o</mi> <mi>g</mi> <mfrac> <msup> <mi>e</mi> <mrow> <mi>f</mi> <mrow> <mo>(</mo> <msub> <mi>r</mi> <mi>i</mi> </msub> <mo>,</mo> <msub> <mi>l</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> </mrow> </msup> <mrow> <msubsup> <mi>&Sigma;</mi> <mrow> <mi>c</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </msubsup> <msup> <mi>e</mi> <mrow> <mi>f</mi> <mrow> <mo>(</mo> <msub> <mi>r</mi> <mi>i</mi> </msub> <mo>,</mo> <mi>c</mi> <mo>)</mo> </mrow> </mrow> </msup> </mrow> </mfrac> </mrow>The metric learning is:A triple is formed using three images, is designated asWherein it isReference sample,Be withIt is generic Image, referred to as positive sample,Be withDifferent classes of image, referred to as negative sample;Note image feature representation is f (x), f (x) Need to standardize by L2, that is, meet | | f (x) | |2=1, then the feature expression of sample is respectively in tripleWithα is predetermined threshold value, and triple loss Triplet Loss are expressed as:<mrow> <msub> <mi>L</mi> <mrow> <mi>t</mi> <mi>r</mi> <mi>i</mi> <mi>p</mi> <mi>l</mi> <mi>e</mi> <mi>t</mi> </mrow> </msub> <mrow> <mo>(</mo> <msubsup> <mi>x</mi> <mi>i</mi> <mi>a</mi> </msubsup> <mo>,</mo> <msubsup> <mi>x</mi> <mi>i</mi> <mi>p</mi> </msubsup> <mo>,</mo> <msubsup> <mi>x</mi> <mi>i</mi> <mi>n</mi> </msubsup> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mi>&Sigma;</mi> <mi>i</mi> <mi>N</mi> </msubsup> <mi>m</mi> <mi>a</mi> <mi>x</mi> <mo>{</mo> <mn>0</mn> <mo>,</mo> <mo>|</mo> <mo>|</mo> <mi>f</mi> <mrow> <mo>(</mo> <msubsup> <mi>x</mi> <mi>i</mi> <mi>a</mi> </msubsup> <mo>)</mo> </mrow> <mo>-</mo> <mi>f</mi> <mrow> <mo>(</mo> <msubsup> <mi>x</mi> <mi>i</mi> <mi>p</mi> </msubsup> <mo>)</mo> </mrow> <mo>|</mo> <msubsup> <mo>|</mo> <mn>2</mn> <mn>2</mn> </msubsup> <mo>-</mo> <mo>|</mo> <mo>|</mo> <mi>f</mi> <mrow> <mo>(</mo> <msubsup> <mi>x</mi> <mi>i</mi> <mi>a</mi> </msubsup> <mo>)</mo> </mrow> <mo>-</mo> <mi>f</mi> <mrow> <mo>(</mo> <msubsup> <mi>x</mi> <mi>i</mi> <mi>n</mi> </msubsup> <mo>)</mo> </mrow> <mo>|</mo> <msubsup> <mo>|</mo> <mn>2</mn> <mn>2</mn> </msubsup> <mo>+</mo> <mi>&alpha;</mi> <mo>}</mo> </mrow>The measurement of final classification result, connection are carried out using the associated losses of two kinds of losses of Softmax Loss and Triplet Loss Loss is closed to be expressed as:L=ω Ltriplet+(1-ω)LsoftmaxWherein, parameter ω represents Triplet Loss proportions.
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