CN108280474A - A kind of food recognition methods based on neural network - Google Patents
A kind of food recognition methods based on neural network Download PDFInfo
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- G06V10/467—Encoded features or binary features, e.g. local binary patterns [LBP]
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Abstract
The food recognition methods based on neural network that the invention discloses a kind of, includes the following steps：S1 obtains food image and inputs neural network；S2 carries out feature extraction and dimensionality reduction to the image of input, obtains key feature；S3 carries out LBP characteristic value calculating to the image of input, obtains LBP characteristic patterns；S4 merges LBP characteristic patterns with key feature, obtains minutia, and minutia is input to next layer；S5 carries out the classification of food image using the feature that neural network finally extracts.The extraction of key feature is not only carried out to the food image of acquisition, LBP feature calculations also are carried out to it, obtained LBP characteristic patterns are merged with key feature, so that minutia is not abandoned, upper network layer still can learn minutia, and it is inaccurate to solve the problems, such as that current food recognition methods identifies details.
Description
Technical field
The present invention relates to a kind of food recognition methods more particularly to a kind of food recognition methods based on neural network.
Background technology
With the development of intellectualized technology, it is based on deep neural network, is extracted in input food image using convolutional calculation
Feature, and be gradually applied to the method that food is classified according to the obtained feature of extraction.At present using nerve
Network model is carried out convolutional calculation to given input picture and carries out feature extraction, after being operated to convolutional calculation using pondization
As a result dimensionality reduction is carried out, feature extraction is carried out from part to the overall situation to image, food image is finally carried out according to the feature of extraction
Classification, in most cases can accurately identify and food picture of classifying.But network is carrying out the operation of pond pondization
Some detailed information that the convolutional calculation of low layer obtains can be lost in the process, so playing important work to classification for some details
Scene, accuracy can reduce.
Specifically, current food recognition methods is to have preferable effect food former material is identified, its original is studied carefully
Because then existing, unprocessed in food former material, food volume to be identified is big, even if identification knot will not be influenced by abandoning big measure feature
Fruit.But for prepared food, particularly with the Chinese meal to be finely good at, food former material passes through careful processing, in vegetable
Food is often the Filamentous or granular of superfine cause, in this case, can largely be abandoned to characteristics of image using script
Recognition methods then can cause important detailed information to be lost, and None- identified Chinese meal vegetable.In this regard, people need one kind can be with
The method being more preferably identified for food details.
Invention content
The present invention provides a kind of food recognition methods based on neural network, it is intended to solve current food recognition methods to thin
The inaccurate problem of section identification.
A kind of food recognition methods based on neural network of the present invention, includes the following steps：
S1 obtains food image and inputs neural network；
S2 carries out feature extraction and dimensionality reduction to the image of input, obtains key feature；
S3 carries out LBP characteristic value calculating to the image of input, obtains LBP characteristic patterns；
S4 merges LBP characteristic patterns with key feature, obtains minutia, and minutia is input to next layer；
S5 carries out the classification of food image using the feature that neural network finally extracts.
A kind of food recognition methods based on neural network of the present invention, not only closes the food image of acquisition
The extraction of key feature also carries out LBP feature calculations to it, and obtained LBP characteristic patterns and key feature are merged, that is,
It says, the LBP characteristic patterns that can will be obtained, be input in the higher level of network using jump connection, the feature extracted with it carries out
Merge, as input next time, forms residual error module so that network can acquire some and lose and passed through in the higher layers
The local detail information after variation is crossed, realization accurately identifies details, solves current food recognition methods and is carrying out Chi Huacao
Some detailed information that the convolutional calculation of low layer obtains can be lost during work, and important work is played to classification for some details
The problem of scene, accuracy can reduce.Specifically, current food recognition methods is when identifying Chinese meal vegetable, by
Tiny and the characteristics of be mutually mixed, the volume in the detailed information that loss is identified can make vegetable that is presented food volume in vegetable
Tiny food materials are lost, and lead to cannot to accurately identify food, and the present invention is by calculating the LBP characteristic patterns of image, and by LBP
Characteristic pattern merges with key feature so that minutia is not abandoned, and upper network layer still can learn minutia, is based on this
One advantage, recognition methods of the present invention can be used for precisely identifying food, be particularly suitable for the identification of Chinese meal vegetable, solve
The problem of current food recognition methods identification details inaccuracy.Meanwhile claimed recognition methods, not only fit
Food for identification is needing to carry out details identification, such as with Chinese meal vegetable have since it has the function of retaining minutia
Plastic grain separation of similar feature etc., can use this kind of recognition methods.The present invention provides one kind to carry out
The method accurately identified, a kind of food recognition methods based on neural network solve current food recognition methods and know to details
Not inaccurate problem.
Description of the drawings
Fig. 1 is a kind of flow chart 1 of the food recognition methods based on neural network；
Fig. 2 is a kind of flow chart 2 of the food recognition methods based on neural network；
Fig. 3 is a kind of flow chart of the step S0 of the food recognition methods based on neural network；
Fig. 4 is a kind of flow chart of the step S01 of the food recognition methods based on neural network；
Fig. 5 is a kind of flow chart of the step S02 of the food recognition methods based on neural network；
Fig. 6 is a kind of flow chart of the step S03 of the food recognition methods based on neural network；
Fig. 7 is a kind of flow chart of the step S2 of the food recognition methods based on neural network；
Fig. 8 is a kind of flow chart of the step S3 of the food recognition methods based on neural network.
Specific implementation mode
As shown in Figure 1, a kind of food recognition methods based on neural network, includes the following steps：S1 obtains food image
And input neural network；S2 carries out feature extraction and dimensionality reduction to the image of input, obtains key feature；S3, to the image of input
LBP characteristic value calculating is carried out, LBP characteristic patterns are obtained；S4 merges LBP characteristic patterns with key feature, obtains details spy
Sign, and minutia is input to next layer；S5 carries out the classification of food image using the feature that neural network finally extracts.
The extraction that key feature is not only carried out to the food image of acquisition, also carries out LBP feature calculations to it, the LBP features that will be obtained
Figure is merged with key feature so that minutia is not abandoned, and upper network layer still can learn minutia, solve
The problem inaccurate to details identification of food recognition methods at present.
As shown in Figure 2 and Figure 3, food recognition methods of this kind based on neural network further includes neural metwork training step
S0, the S0 include the following steps：S01 makes and collects sample；S02 selects training sample, extracts its key feature and LBP is special
Sign figure simultaneously merges, and obtains minutia and is input to next layer；S03 calculates the damage for the feature that neural network finally extracts
It loses, loss is more than threshold value to return to step S02, and step then enters step S04 less than threshold value；S04 uses the image of test sample
It is tested, terminates training step if test loss is less than threshold value, enter step S1, returned if test loss is more than threshold value
Step S02.The step is neural metwork training step, and neural network has learning functionality, and food is being carried out using neural network
Before identification, neural network can be trained, so that its study is needed the object identified, in the study to a large amount of training samples
Under, the object that can be more fast and accurately identified to needs is identified.
As shown in figure 4, the step S01 includes the following steps：S011 collects the image of all cuisines, is adjusted to fixed
The image of size；S012 is the corresponding cuisine name label of distribution of each cuisine image；S013, by all images and corresponding
Label is divided into training sample and test sample.Food is identified using neural network in the present invention, in training neural network
It is to need to collect food sample, part of the food sample is trained neural network as training sample, and part sample is as survey
Sample sheet tests trained neural network, subsequently to use.
As shown in figure 5, institute step S02 includes the following steps：S021 chooses training sample and inputs network, uses convolution meter
Calculate the characteristic pattern of extraction input picture；S022, using the characteristic pattern in maximum pond operation processing step S021, and to result into
Row nonlinear activation function handles to obtain key feature；S023, the pass for calculating the LBP characteristic patterns of image and being obtained with step S022
Key feature merges；Step S023 is merged the mean value of gained and variance carries out Batch Normalization operations by S024, will
It is normalized in the range of [0,1], and next layer of convolution is inputted as minutia.The LBP characteristic patterns that will be obtained, use jump
Jump connection is input in the higher level of network, and the feature extracted with it merges, and as next layer of input, forms residual error
Module so that network can acquire some and lose and the local detail information after variation in the higher layers.
As shown in fig. 6, the step S03 includes the following steps：S031 uses the activation value of the last one activation primitive
Full articulamentum is launched into specified size；S032, the probability that each cuisine is belonged to using softmax output images obtain pre- mark
Label；S033 uses loss function counting loss according to prediction label and physical tags, the end step if losing and being less than threshold value,
S034 is entered step if losing and being more than threshold value；S034 calculates gradient updating according to the loss of step S033 using majorized function
Network parameter, and return to step S02.Loss is calculated, to be further adjusted training to neural network, ensures god
Detailed information appropriate can be retained through network, even if causing details to lack because bottom-up information is abandoned, also not because retaining
A large amount of garbages, influence treatment effeciency.
As shown in fig. 7, the step S2 includes the following steps：S21 extracts the feature of input picture using convolutional calculation
Figure；S22 uses the characteristic pattern in maximum pond operation processing step S21；S23 uses nonlinear activation function processing step
Output in S22, obtains key feature.The step is to be input to food image in network to handle, and network is iteratively every
One layer carries out feature extraction to image, is carried out at the same time dimensionality reduction, is then specifically, for the food image of input, uses difference
Convolution kernel carry out convolutional calculation and extract different characteristics of image, for the feature that convolutional calculation obtains, operated and gone using pondization
Except redundancy reaches dimensionality reduction effect, nonlinear activation primitive is used after pondization operation, by Feature Mapping to Nonlinear Space
Between in, for each activation value, stablize activation value using the mean variance of Batch Normalize activation values, network changes
In generation, in such a way extracts characteristics of image.
As shown in figure 8, the step S3 includes the following steps：S31 delimit big each pixel using LBP operators
In the small neighborhood for k；S32 is and adjacent using centre of neighbourhood pixel as threshold value（k*k-1）The gray value of a pixel is compared；
S33, if surrounding pixel is more than center pixel value, the position of the pixel is marked as 1, is otherwise labeled as 0；S34, according to suitable
Mark point in neighborhood is arranged in a binary number by hour hands from outside to inside, centered on pixel LBP values；S35, weight
Multiple step S31 to step S34, obtains the LBP characteristic patterns of entire image.This step is LBP characteristic images in order to obtain, to make
It is input in the higher level of network with jump connection, is merged with its activation value, as next layer of input, form residual error
Module so that network can acquire some and lose and the local detail information after variation in the higher layers.
For those skilled in the art, technical solution that can be as described above and design are made other each
Kind is corresponding to be changed and deforms, and all these change and deform the protection model that should all belong to the claims in the present invention
Within enclosing.
Claims (7)
1. a kind of food recognition methods based on neural network, which is characterized in that include the following steps：
S1 obtains food image and inputs neural network；
S2 carries out feature extraction and dimensionality reduction to the image of input, obtains key feature；
S3 carries out LBP characteristic value calculating to the image of input, obtains LBP characteristic patterns；
S4 merges LBP characteristic patterns with key feature, obtains minutia, and minutia is input to next layer；
S5 carries out the classification of food image using the feature that neural network finally extracts.
2. a kind of food recognition methods based on neural network according to claim 1, which is characterized in that further include nerve
Network training step S0, the S0 include the following steps：
S01 makes and collects sample；
S02 selects training sample, extracts its key feature and LBP characteristic patterns and merge, obtain minutia and be input to
Next layer；
S03 calculates the loss for the feature that neural network finally extracts, and loss is more than threshold value to return to step S02, and step is less than threshold
Value then enters step S04；
S04 is tested using the image of test sample, is terminated training step if test loss is less than threshold value, is entered step
S1, the return to step S02 if test loss is more than threshold value.
3. a kind of food recognition methods based on neural network according to claim 2, which is characterized in that the step
S01 includes the following steps：
S011 collects the image of all cuisines, is adjusted to the image of fixed size；
S012 is the corresponding cuisine name label of distribution of each cuisine image；
All images and corresponding label are divided into training sample and test sample by S013.
4. a kind of food recognition methods based on neural network according to claim 2, which is characterized in that the step
S02 includes the following steps：
S021 is chosen training sample and inputs network, the characteristic pattern of input picture is extracted using convolutional calculation；
S022 is carried out using the characteristic pattern in maximum pond operation processing step S021, and to result at nonlinear activation function
Reason obtains key feature；
S023 calculates the LBP characteristic patterns of image and merges with the obtained key features of step S022；
Step S023 is merged the mean value of gained and variance carries out Batch Normalization operations, normalized by S024
To in the range of [0,1], next layer of convolution is inputted as minutia.
5. a kind of food recognition methods based on neural network according to claim 2, which is characterized in that the step
S03 includes the following steps：
The activation value of the last one activation primitive is launched into specified size by S031 using full articulamentum；
S032, the probability that each cuisine is belonged to using softmax output images obtain prediction label；
S033 uses loss function counting loss according to prediction label and physical tags, the end step if losing and being less than threshold value,
S034 is entered step if losing and being more than threshold value；
S034 calculates gradient updating network parameter, and return to step S02 according to the loss of step S033 using majorized function.
6. according to a kind of food recognition methods based on neural network of claim 1-6 any one of them, which is characterized in that institute
Step S2 is stated to include the following steps：
S21 extracts the characteristic pattern of input picture using convolutional calculation；
S22 uses the characteristic pattern in maximum pond operation processing step S21；
S23 obtains key feature using the output in nonlinear activation function processing step S22.
7. according to a kind of food recognition methods based on neural network of claim 1-6 any one of them, which is characterized in that institute
Step S3 is stated to include the following steps：
S31 delimit in the neighborhood that size is k each pixel using LBP operators；
S32 is and adjacent using centre of neighbourhood pixel as threshold value（k*k-1）The gray value of a pixel is compared；
S33, if surrounding pixel is more than center pixel value, the position of the pixel is marked as 1, is otherwise labeled as 0；
S34, according to by the mark point in neighborhood, being arranged in a binary number from outside to inside clockwise, centered on pixel
LBP values；
S35 repeats step S31 to step S34, obtains the LBP characteristic patterns of entire image.
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