CN104112113A - Improved characteristic convolutional neural network image identification method - Google Patents
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Abstract
The invention discloses an improved characteristic convolutional neural network image identification method. According to the improved characteristic convolutional neural network image identification method, firstly, pre-processing on an image to be inputted is carried out; secondly, a characteristic extraction layer is added to a convolutional neural network structure, and the characteristics are amplified; image data with characteristic amplification is inputted to a convolutional neural network, convolutional operation learning identification for the characteristics in the image is carried out, output of the convolutional neural network is acquired, and offset operation on the image after pre-processing in the first step is further carried out to acquire textural characteristics of the image; lastly, the textural characteristics are analyzed to output a result, and outputs of the convolutional neural network are fused to output a final result. By adding the characteristic extraction layer, the characteristics of the image are reinforced, so extraction of some unconspicuous characteristics is facilitated, the image identification rate can be effectively improved, and methods can be further provided for image searching and image identification, and identification efficiency is improved.
Description
Technical field
The invention belongs to mode identification technology, particularly a kind of based on modified feature convolutional neural networks image-recognizing method.
Background technology
At present, pattern-recognition is still one of the most popular research direction of computer science.Giving computing machine sensory faculty, is the study hotspot of pattern-recognition.Scholars have proposed many algorithms for graph and image processing, the directions such as speech processes.
Aspect image recognition, be mainly from image, to extract unique point, then utilize this feature to identify image.At present, the main algorithm that is used to image recognition is a lot, such as: wavelet analysis, support vector machine (SVM), genetic algorithm, neural network algorithm etc.
Heisele, Bernd has proposed a kind of face recognition algorithm based on SVM.It is divided into respectively a plurality of regions by people's face, utilize face image data storehouse to train algorithm, then from these regions, extract different features for image recognition, obtained certain effect (Heisele, Bernd. Face recognition with support vector machines:global versus component-based approach[C]. IEEE, 2001:688-694.).
Aspect neural network, in the sixties in 20th century, Hubel and Wiesel find that its unique network structure can reduce the complicacy of Feedback Neural Network effectively during for the neuron of local sensitivity and set direction in research cat cortex, have then proposed convolutional neural networks (Convolutional Neural Networks-is called for short CNN).Along with the deep understanding of scholar for convolutional neural networks, according to the difference of application scenarios, scholars have proposed some weakness that different modified versions overcame convolutional neural networks originally.
Aspect convolutional neural networks, Yann LeCun etc. has proposed to utilize convolutional neural networks to carry out the identification of hand-written script.But because the complicacy of font is higher, so the Algorithm for Training time is longer, obtained certain effect (Y.LeCun, L.Bottou, Y.Bengio, andP.Haffner. " Gradient-based Learning Applied to Document Recognition ", Proceedings of the IEEE, vol.86, pp.2278 – 2324, November1998.).
Summary of the invention
1, object of the present invention.
The invention provides and a kind ofly based on modified feature convolutional neural networks image-recognizing method, can in convolutional neural networks, for feature identifying, instruct, strengthen its ability in feature extraction, improve image recognition rate.
2, the technical solution adopted in the present invention.
Based on modified feature convolutional neural networks image-recognizing method, adopt following steps:
The first step, carries out pre-service to image to be entered, gets rid of the image of serious non-compliance regulation, and according to the attribute of input picture, design convolutional neural networks structure;
Second step adds feature extraction layer to strengthen convolutional neural networks for the extractability of characteristics of image in convolutional neural networks structure, and feature is amplified;
The 3rd step, the feature enlarged image data input convolutional neural networks by described step 2, carries out convolution operation study identification to the feature in image, obtains the output of convolutional neural networks;
The 4th step, carries out offset operation by pretreated image in described first step, obtains the textural characteristics of image;
The 5th step, to Output rusults after the analysis of texture of described step 4, and merges the output of the convolutional neural networks in described step 3, obtains net result and exports.
3, beneficial effect of the present invention.
The present invention compared with prior art, its remarkable advantage: 1), by increasing feature extraction layer, can instruct for the characteristic extraction procedure of convolutional neural networks, strengthened ability in feature extraction; 2) image for input does not need too much artificial pre-service.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is feature convolutional neural networks structural drawing.
Fig. 2 is the skew schematic diagram of texture feature extraction pixel.
Fig. 3 is texture feature extraction weight matrix schematic diagram.
Embodiment
Embodiment
As shown in Figure 1, the step of employing is as follows for general structure of the present invention:
The first step, carries out pre-service to view data, manually rejects the vicious image of obvious tool, according to the attribute design convolutional neural networks structure of image, and realizes its algorithm.
Second step, according to pretreated view data, analyzes its characteristic properties, and its feature is amplified.In the present embodiment, unique point is not special obviously by the method for transform color space, its feature to be amplified in rgb space, by original RGB data transformation to HLS color space.
Transformation for mula is as follows:
The 3rd step, the view data input convolutional neural networks by extension, carries out convolution operation to it, and finally obtains network output N
1.
The 4th step, by former figure
to 8 directions, be respectively offset a pixel, as shown in Figure 2, produce respectively new figure
?
,
with the new figure producing
,
right
operate and obtain new figure
, computing formula is as follows:,
For can basis
,
this 8 secondary figure extrapolates the position relationship between itself and former figure, adopts 3 * 3 matrixes
calculate.
as shown in Figure 3, by funtcional relationship f to 8 each pixel of secondary picture
operate, computing formula is as follows:
If 32 * 32 of general pattern sizes are number of features totally 1024 features now, number of features is too much, the inconvenient analysis to feature, and in the new feature figure now obtaining, element size is all between 1~255, so now gained characteristic pattern is at 1~255 enterprising column hisgram
, number of features reduces to 255, is convenient to obtain Local textural feature.
The 5th step, need to analyze 255 Local textural features that extract here, and Output rusults is N
2, finally to N
2merge the N of output with above-mentioned convolutional neural networks
1merge, thereby obtain last result.
Above-described embodiment does not limit the present invention in any way, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops in protection scope of the present invention.
Claims (4)
1. based on a modified feature convolutional neural networks image-recognizing method, it is characterized in that adopting following steps:
The first step, carries out pre-service to image to be entered, gets rid of the image of serious non-compliance regulation, and according to the attribute of input picture, design convolutional neural networks structure;
Second step adds feature extraction layer to strengthen convolutional neural networks for the extractability of characteristics of image in convolutional neural networks structure, and feature is amplified;
The 3rd step, the feature enlarged image data input convolutional neural networks by described step 2, carries out convolution operation study identification to the feature in image, obtains the output of convolutional neural networks;
The 4th step, carries out offset operation by pretreated image in described first step, obtains the textural characteristics of image;
The 5th step, to Output rusults after the analysis of texture of described step 4, and merges the output of the convolutional neural networks in described step 3, obtains net result and exports.
2. modified feature convolutional neural networks according to claim 1, is characterized in that the feature amplification employing of described step 2 transforms to HLS color space by unique point at rgb space, and transform method is as follows:
。
3. modified feature convolutional neural networks according to claim 1, it is characterized in that the 4th described step image being carried out to offset operation, to obtain the textural characteristics method of image as follows:
Step 3.1, by former figure
to 8 directions, be respectively offset a pixel, produce respectively new figure
?
,
, with the new figure producing
?
,
right
operate and obtain new figure
, method is as follows:
Step 3.2,
?
,
with former figure
position relationship adopt 3 * 3 matrixes
calculate matrix
as shown in form,
By funtcional relationship f to 8 each pixel of secondary picture
operate, computing formula is as follows:
。
4. modified feature convolutional neural networks according to claim 3, in the new feature figure that it is characterized in that obtaining, element size is all between 1~255, to gained characteristic pattern, at 1~255 enterprising column hisgram, obtaining number of features is 255.
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