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CN110473173A - A kind of defect inspection method based on deep learning semantic segmentation - Google Patents

A kind of defect inspection method based on deep learning semantic segmentation Download PDF

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Publication number
CN110473173A
CN110473173A CN201910673139.5A CN201910673139A CN110473173A CN 110473173 A CN110473173 A CN 110473173A CN 201910673139 A CN201910673139 A CN 201910673139A CN 110473173 A CN110473173 A CN 110473173A
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defect
image
semantic segmentation
defects detection
training
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赵青
梅爽
宋瑞超
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Entropy Technology (shenzhen) Co Ltd
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Entropy Technology (shenzhen) Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20081—Training; Learning
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20084—Artificial neural networks [ANN]

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  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

The present invention relates to a kind of defect inspection methods based on semantic segmentation, comprising: production object table planar defect training image collection；Complete the manual mark of surface defect image；Build the deep learning semantic segmentation defects detection model applied to body surface defects detection；Carry out the training of deep learning semantic segmentation defects detection model；Based on the deep learning semantic segmentation defects detection model trained, body surface defects detection is carried out；Obtain corresponding output has defect kind label image, obtains defects detection result.It can automate, is efficient to body surface progress defects detection, to realize the automatic identification of body surface defect and the quantification treatment of defects detection result.After detectable substance surface imperfection or scene complexity rise, it can be good at taking into account detection effect and detection efficiency.

Description

A kind of defect inspection method based on deep learning semantic segmentation
Technical field
The present invention relates to a kind of body surface defect automatic testing method and systems, and in particular to one kind is based on deep learning The body surface defect inspection method of semantic segmentation.
Background technique
With the development of modern industry, defect detecting technique is widely used in Fabric Defect detection, workpiece surface quality Detection, aerospace field etc..Relative to the body surface defects detection under simple scenario, modern industry is to defect detecting technique Propose more strict requirements.With the appearance and development of the science and technology such as computer technology, artificial intelligence, it is based on machine The body surface defect detecting technique of vision technique is applied and is given birth to, largely improve body surface defects detection effect with And body surface defects detection rate is improved, while avoiding because the factors such as scene condition, subjective judgement influence defects detection As a result accuracy.In technical field of machine vision, body surface defect detecting technique simulates people by computer vision Class visual performance, the acquisition process for carrying out image from specific tested material object calculates, final to realize that industrial vision is actually detected, controls System and corresponding scene application.
But the body surface defect detecting technique of current most of machine vision techniques both for rule of surface or Person detects the simple situation of scene, after detectable substance surface imperfection or scene complexity rising, detection effect and detection effect Rate just cannot be considered in terms of, and seriously affect the applicability of defects detection.
Summary of the invention
It is a kind of based on deep technical problem to be solved by the present invention lies in providing in view of the deficiency of the prior art The defect inspection method of degree study semantic segmentation can automate, is efficient to body surface progress defects detection, thus real The automatic identification of existing body surface defect and the quantification treatment of defects detection result.When detectable substance surface imperfection or scene After complexity rises, it can be good at taking into account detection effect and detection efficiency.
The technical scheme adopted by the invention is as follows:
A kind of defect inspection method based on semantic segmentation, it is characterised in that specifically includes the following steps:
S1, production object table planar defect training image collection, to the body surface under different spaces pose under Same Scene Carry out surface defect image sample collection；
S2, production object table planar defect image set, the manual mark of surface defect image is completed using image enhancement technique；
S3, surface defect training image collection TrainSet is utilizedDefectFor input, surface defect marks training image collection TrainLabelSetDefectFor output, the deep learning semantic segmentation defects detection applied to body surface defects detection is built Model；
S4, the training for carrying out deep learning semantic segmentation defects detection model；
S5, based on the deep learning semantic segmentation defects detection model trained, carry out body surface defects detection；
Obtain corresponding output has defect kind label image, obtains defects detection result.
Further, in step S1, capturing sample image quantity is N width, N >=300.
Further, in step S2, in the production of body surface defect map image set, it is desirable that surface defect area interception image 1/3, be not otherwise considered as defect image；In a width defect image, defective data will be far fewer than background data；By object After surface defect image enhances Processing Algorithm, the ratio of defective data and background data is close to 1:1 in image.
Further, image enhancement technique includes Image Reversal transformation, random trimming, color jitter, translation in step S2 At least one of transformation, change of scale, contrast variation, noise disturbance and rotation transformation/reflection transformation.
Further, when step S2 marks surface defect image manually, recording surface defect training image collection is TrainSetDefect, picture format is [m, n, 3], and recording surface defect mark training image collection corresponds to TrainLabelSetDefect, picture format is [m, n], and m is that picture size corresponds to length, and n is that picture size corresponds to width.
Further, deep learning semantic segmentation defects detection model described in step S3 is set as to picture each in image Element carries out classification understanding, carries out image segmentation for body surface defect area respective pixel, carries out according to different defect kinds Classification, gives identical defect kind label for same kind of different surfaces defect and exports.
Further, deep learning semantic segmentation defects detection model includes four chief components in step S3: volume Lamination, pond layer, down-sampled layer and up-sampling layer；The dimensionality reduction sampling of feature vector is completed in down-sampled layer；Input data format For the defect image data of [m, n, 3], it includes not in label image that the label image of output, which is the label image of [m, n] format, Generic defect kind and background.
The image input format of deep learning semantic segmentation defects detection model setting is [m, n, 3], by model convolution Compression forms compressive features vector [w, h, d] after layer, pond layer, and wherein w is the span of feature vector, and h is the height of feature vector Degree, d are the depth of feature vector；Relative to original objects surface defect image input data, the compressive features vector is corresponding empty Between dimension it is lower but more compact.Compressive features vector [w, h, d] is input to model up-sampling layer by down-sampled layer, rebuilds Output identical with input layer (including convolutional layer, pond layer) dimension of deep learning semantic segmentation defects detection prototype network Vector [m, n] exports the label image [m, n] with defect classification corresponding with input picture.
The present invention is based on traditional image classification depth convolutional neural networks, to each of defect image pixel Classification is made, i.e., image is understood in pixel scale.Deep learning semantic segmentation defects detection model will not be to target Example distinguishes, i.e., if in image including same category of two targets, corresponds to class label having the same, i.e., Identical defect kind label can be given by belonging to same kind of different surfaces defect.
Further, in step S4 carry out deep learning semantic segmentation defects detection model training in the following manner into Row:
For defect map image set ImageSetDefectImage collection LabelImageSet is marked with defectDefect, by image Middle background information is set as 0 class detection, and the defect information including crackle class is set as 1 class detection, and respective weights ratio is pressed Respective pixel statistics ratio is configured, i.e., 0 class and 1 class detection corresponding pixel points quantity ratio are 1:k, k in correspondence image For constant, then corresponding training weight ratio is k:1；Then the maximum training the number of iterations of setting is N=30000, and it is most that N corresponds to numerical value May be big, if loss value has restrained during hands-on, can deconditioning, and then detect test effect.
Further, defect map image set ImageSet is directed in step S4Defect, using manual marking software Colabeler pixel segmentation software v2.0.4 marks off the defects of every width defect image region in defect image training set, and Corresponding defect kind is marked, defect is formed and marks image collection LabelImageSetDefect。
Further, defect map image set ImageSet is completed in step S4DefectMark work after, by corresponding input figure Picture and label image are converted to TFRecord format, while the depth that model training parameter completes corresponding defect map image set is arranged Semantic segmentation defects detection model training is practised, defect is formed and marks image collection LabelImageSetDefect。
Defect map image set ImageSetDefectImage input format be that [m, n, 3] and defect mark image collection LabelImageSetDefectImage input format be [m, n].
Further, step S5 carries out body surface based on the deep learning semantic segmentation defects detection model trained Defects detection；The deep learning semantic segmentation defects detection model trained in step S4 is solidified, i.e. generation pb model File；For deep learning semantic segmentation defects detection model after solidification, defect image data are inputted, obtain the tool of corresponding output Defective type label image obtains defects detection result.
Compared with the existing technology, obtained by the present invention to have the beneficial effect that
The detection effect and detection rates of body surface defect are not ensured that using traditional image processing algorithm, this Invention builds deep learning semantic segmentation defects detection mould by the above-mentioned defect inspection method based on deep learning semantic segmentation Type carries out classification understanding to pixel each in image, to complete the segmentation work of body surface defect area respective pixel, base In cured body surface defects detection model, inputting defect image can be obtained defect kind result.Higher speed can be achieved The body surface defect kind of rate divides and quantification treatment.
Detailed description of the invention
Fig. 1 is the principle steps figure of the method for the present invention.
Fig. 2 is process step figure of the invention (being configured with implementation result picture).
Specific embodiment
The invention will be further described by 1-2 with reference to the accompanying drawing.
As shown in Figure 1, the implementation case provides a kind of body surface defects detection based on deep learning semantic segmentation Method, implementation steps include:
S1: production object table planar defect training image collection first, to the object under different spaces pose under Same Scene Surface carries out defect image acquisition, and capturing sample image quantity is N width (N >=300).
S2: completing the manual mark of surface defect image using image enhancement technique, and record defect map image set is ImageSetDefect(picture format is [m, n, 3]), record defect mark image collection correspond to LabelImageSetDefect (picture format is [m, n]).
In the production of body surface defect map image set, it is desirable that otherwise the 1/3 of surface defect area interception image is not considered as Defect image.In a width defect image, defective data will be far fewer than background data, to improve body surface defects detection effect Fruit, introducing image data in use the technical solution of the present invention enhances technology comprising Image Reversal transformation is trimmed, color at random Color shake, translation transformation, change of scale, contrast variation, noise disturbance and rotation transformation/reflection transformation.By object table After planar defect image enhancement processing algorithm, the ratio of defect and background data is close to 1:1 in image.
S3, deep learning semantic segmentation network model is built；The present invention is with traditional image classification depth convolutional Neural net Based on network, classification is made to each of defect image pixel, i.e., image is understood in pixel scale.Depth Object instance will not be distinguished by practising semantic segmentation defects detection model, i.e., if in image including same category of two mesh Mark, then it corresponds to class label having the same, therefore the present invention builds deep learning semantic segmentation defects detection model, and will It is applied to body surface defects detection, i.e., same kind of body surface defect can class label having the same.
Projected depth study semantic segmentation defects detection prototype network of the present invention includes three chief components: convolution Layer, down-sampled layer and up-sampling layer.Body surface defect image input format is [m, n, 3], by model convolutional layer, pond layer Compression of images is expressed as the feature vector of [w, h, d] afterwards, and wherein w is the span of feature vector, and h is the height of feature vector, d For the depth of feature vector, relative to original image input data, it is lower but more tight which corresponds to Spatial Dimension It causes.This compression vector is input to model up-sampling layer by the present invention, rebuilds output vector identical with mode input layer dimension, i.e., The corresponding defect class label image of input picture.
S4: setting model training parameter (including: defect classification respective weights ratio, maximum training the number of iterations etc.), it is complete At the training of deep learning semantic segmentation defects detection model.
For object defect map image set ImageSetDefect, marked off using manual marking software Colabeler v2.0.4 The defects of each image region, and corresponding defect kind is marked, 0 class and 1 class defects detection item complete defect image training Corresponding input picture and label image are converted into TFRecord format in the mark work of collection, while model training parameter is set Complete the deep learning semantic segmentation defects detection model training of corresponding diagram image set.
S5, based on the body surface defects detection for having trained deep learning semantic segmentation defects detection model: by step S4 In the deep learning semantic segmentation defects detection model trained solidified, be converted to Tensorflow pb file, corresponding mould Type input is the defect image of [m, n, 3] format, and model output is the defect class label image of [m, n] format, label image In include different classes of defect kind and background.
S51, deep learning semantic segmentation defects detection model inspection result is visualized, as shown in Fig. 2, defect is examined Surveying black region part in effect image is 0 class defects detection item, and red area is 1 class detection, is based on to realize The body surface defects detection effect of deep learning semantic segmentation.
S52, by the quantification treatment of the achievable body surface defect of image region segmentation algorithm, i.e., pass through tradition first ZhangShi camera calibration algorithm solves pixel coordinate to the conversion map matrix of world coordinates, and then counts red in solution S51 The corresponding pixel faces product value in color region can finally obtain the actual value of corresponding 1 class defects detection item, realize and really scheme in Fig. 2 Body surface defects detection effect in piece.

Claims (10)

1. a kind of defect inspection method based on semantic segmentation, it is characterised in that specifically includes the following steps:
S1, production object table planar defect training image collection, carry out the body surface under different spaces pose under Same Scene Surface defect image sample collection；
S2, production object table planar defect image set, the manual mark of surface defect image is completed using image enhancement technique；
S3, surface defect training image collection TrainSet is utilizedDefectFor input, surface defect marks training image collection TrainLabelSetDefectFor output, the deep learning semantic segmentation defects detection applied to body surface defects detection is built Model；
S4, the training for carrying out deep learning semantic segmentation defects detection model；
S5, based on the deep learning semantic segmentation defects detection model trained, carry out body surface defects detection；It is corresponded to Output has defect kind label image, obtains defects detection result.
2. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that in step S1, acquire sample This amount of images is N width, N >=300.
3. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that in step S2, in object In the production of surface defect image collection, it is desirable that otherwise the 1/3 of surface defect area interception image is not considered as defect image；One In width defect image, defective data will be far fewer than background data；After body surface defect image enhances Processing Algorithm, image The ratio of middle defective data and background data is close to 1:1；Image enhancement technique includes Image Reversal transformation, with machine maintenance in step S2 Cut, in color jitter, translation transformation, change of scale, contrast variation, noise disturbance and rotation transformation/reflection transformation extremely Few one kind.
4. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that step S2 is marked manually When surface defect image, recording surface defect training image collection is TrainSetDefect, picture format is [m, n, 3], record sheet Planar defect mark training image collection corresponds to TrainLabelSetDefect, picture format is [m, n], and m is the corresponding length of picture size Degree, n are that picture size corresponds to width.
5. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that deep described in step S3 Degree study semantic segmentation defects detection model is set as carrying out classification understanding to pixel each in image, for body surface defect Region respective pixel carries out image segmentation, classifies according to different defect kinds, for same kind of different surfaces defect It gives identical defect kind label and is exported；If in image including same category of two targets, tool is corresponded to There is identical class label, that is, identical defect kind label can be given by belonging to same kind of different surfaces defect.
6. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that depth in step S3 Practising semantic segmentation defects detection model includes four chief components: convolutional layer, pond layer, down-sampled layer and up-sampling layer； The dimensionality reduction sampling of feature vector is completed in down-sampled layer；Input data format is the defect image data of [m, n, 3], the mark of output The label image that image is [m, n] format is signed, includes different classes of defect kind and background in label image.
7. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that depth in step S3 The image input format for practising the setting of semantic segmentation defects detection model is [m, n, 3], is compressed after model convolutional layer, pond layer It is formed compressive features vector [w, h, d], wherein w is the span of feature vector, and h is the height of feature vector, and d is feature vector Depth；Contracting feature vector [w, h, d] is input to model up-sampling layer by down-sampled layer, rebuilds and lacks with deep learning semantic segmentation The identical output vector of input layer dimension [m, n] of detection model network is fallen into, that is, is exported corresponding with input picture with defect The label image [m, n] of classification.
8. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that carried out in step S4 deep The training of degree study semantic segmentation defects detection model carries out in the following manner:
For defect map image set ImageSetDefectImage collection LabelImageSet is marked with defectDefect, will be carried on the back in image Scape information is set as 0 class detection, and the defect information including crackle class is set as 1 class detection, and respective weights ratio is by correspondence Pixels statistics ratio is configured, i.e., 0 class and 1 class detection corresponding pixel points quantity ratio are 1:k in correspondence image, and k is normal Number, then corresponding training weight ratio is k:1；Then the maximum training the number of iterations of setting is N=30000, and N corresponds to numerical value as far as possible Greatly, if loss value has restrained during hands-on, can deconditioning, and then detect test effect.
9. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that for scarce in step S4 Fall into image set ImageSetDefect, defect map is marked off using manual marking software Colabeler pixel segmentation software v2.0.4 As the defects of every width defect image region in training set, and corresponding defect kind is marked, forms defect and mark image collection LabelImageSetDefect；Complete defect map image set ImageSetDefectMark work after, will corresponding input picture and label Image is converted to TFRecord format, while the deep learning semanteme point that model training parameter completes corresponding defect map image set is arranged Defects detection model training is cut, defect is formed and marks image collection LabelImageSetDefect。
10. the defect inspection method according to claim 1 based on semantic segmentation, it is characterised in that step S5 is based on having instructed Experienced deep learning semantic segmentation defects detection model carries out body surface defects detection；The depth that will have been trained in step S4 Study semantic segmentation defects detection model is solidified, i.e. generation pb model file；For deep learning semantic segmentation after solidification Defects detection model inputs defect image data, and obtain corresponding output has defect kind label image, obtains defects detection As a result.
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Application publication date: 20191119