CN107194872B - Remote sensed image super-resolution reconstruction method based on perception of content deep learning network - Google Patents
Remote sensed image super-resolution reconstruction method based on perception of content deep learning network Download PDFInfo
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Abstract
The invention discloses a kind of Remote sensed image super-resolution reconstruction methods based on perception of content deep learning network, the invention proposes the comprehensive measurement indexs and calculation method of picture material complexity, based on this, sample image is classified by content complexity, the deep layer GAN network model of building and the high, medium and low three kinds of complexity of training not etc., then it according to the content complexity of the input picture to oversubscription, chooses corresponding network and is rebuild.In order to improve the learning performance of GAN network, the present invention gives a kind of loss function definition of optimization simultaneously.The present invention overcomes the contradictions of over-fitting generally existing in the super-resolution rebuilding based on machine learning and poor fitting, effectively improve the super-resolution rebuilding precision of remote sensing image.
Description
Technical Field
The invention belongs to the technical field of image processing, relates to an image super-resolution reconstruction method, and particularly relates to a remote sensing image super-resolution reconstruction method based on a content-aware deep learning network.
Background
The remote sensing image with high spatial resolution can describe the ground features more finely and provide rich detail information, so people usually hope to obtain the image with high spatial resolution. With the rapid development of the spatial detection theory and technology, remote sensing images with meter-level and even sub-meter-level spatial resolution (such as IKNOS and QuickBird) gradually come to be applied, but the temporal resolution is generally low. In contrast, some sensors with lower spatial resolution (e.g., MODIS) have high temporal resolution, and they can acquire a wide range of remote sensing images in a short time. If an image with high spatial resolution can be reconstructed from these images with lower spatial resolution, a remote sensing image with both high spatial resolution and high temporal resolution can be acquired. Therefore, it is necessary to reconstruct the remote sensing image with lower resolution to obtain the image with higher resolution.
In recent years, deep learning has been widely used to solve various problems in computer vision and image processing. In 2014, c.dong et al, university of chinese in hong kong, introduced deep CNN learning into super-resolution reconstruction of images first, and obtained better effect than the previous mainstream sparse expression method; in 2015, jkim et al, seoul national university in korea, further proposed an RNN-based improvement method, with further improvement in performance; in 2016, y.romano et al, Google corporation developed a fast and accurate learning method; shortly thereafter, c.leiig et al, Twitter corporation, used GAN networks (generative countermeasure networks) for image super-resolution, achieving the best reconstruction results to date. Moreover, the GAN is a deep belief network at the bottom, no longer relying strictly on supervised learning, and can be trained even without one-to-one pairs of high and low resolution image samples.
After the deep learning model and the network architecture are determined, the performance of the super-resolution method based on the deep learning is determined by the quality of the network model training to a great extent. Deep learning network models are not trained more thoroughly and efficiently, but rather should be adequately and appropriately sample learned (just as deep network models are not more numerous and better). For complex images, more samples need to be trained, so that more image features can be learned, but the network is easy to overfit for simple-content images, so that the super-resolution result is fuzzy; on the contrary, the training intensity is reduced, the over-fitting phenomenon of the simple content images can be avoided, but the under-fitting problem of the complex content images can be caused, and the naturalness and the fidelity of the reconstructed images are reduced. How to achieve the training network can simultaneously meet the requirements of high-quality reconstruction of images with complex contents and simplicity, and is a problem that a deep learning-based method in the actual super-resolution application cannot avoid.
Disclosure of Invention
In order to solve the technical problem, the invention provides a remote sensing image super-resolution reconstruction method based on a content-aware deep learning network.
The technical scheme adopted by the invention is as follows: a remote sensing image super-resolution reconstruction method based on a content-aware deep learning network is characterized by comprising the following steps:
step 1: collecting high and low resolution remote sensing image samples, and performing block processing;
step 2: calculating the complexity of each image block, dividing the image blocks into a high class, a middle class and a low class according to the complexity, and respectively forming a training sample set with high complexity, middle complexity and low complexity;
and step 3: respectively training three GAN networks with high, medium and low complexity by using the obtained sample set;
and 4, step 4: and calculating the complexity of the input image, and selecting a corresponding GAN network for reconstruction according to the complexity.
Compared with the existing image super-resolution method, the method has the following advantages and positive effects:
(1) by using the simple idea of image classification, the method successfully overcomes the common contradiction of over-fitting and under-fitting in the super-resolution reconstruction based on machine learning, and effectively improves the super-resolution reconstruction precision of the remote sensing image;
(2) the deep learning network model based on the method is a GAN network, and the network does not depend on strictly aligned high-resolution and low-resolution sample blocks one by one during training, so that the application universality is improved, and the method is particularly suitable for the multi-source asynchronous imaging environment of high-resolution and low-resolution images in the field of remote sensing.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
In order to facilitate the understanding and implementation of the present invention for those of ordinary skill in the art, the present invention is further described in detail with reference to the accompanying drawings and examples, it is to be understood that the embodiments described herein are merely illustrative and explanatory of the present invention and are not restrictive thereof.
Referring to fig. 1, the remote sensing image super-resolution reconstruction method based on the content-aware deep learning network provided by the invention comprises the following steps:
step 1: collecting samples of the high-resolution and low-resolution remote sensing images, and uniformly cutting the high-resolution images into 128x128 image blocks and the low-resolution images into 64x64 image blocks;
step 2: calculating the complexity of each image block, dividing the image blocks into a high class, a middle class and a low class according to the complexity, and respectively forming a training sample set with high complexity, middle complexity and low complexity;
the computing principle and method of the image complexity are as follows:
the complexity of the image content comprises texture complexity and structural complexity, the information entropy and the gray scale consistency performance well describe the texture complexity, and the structural complexity is suitably described by the edge ratio of an object in the image. The content complexity measurement index C of the image is formed by weighting an information entropy H, a gray level consistency U and an edge ratio R according to the following formula:
C＝wh×H+wu×U+we×R；
where w ish，wu，weEach is a respective weight, which is determined experimentally.
The respective calculation methods of the information entropy, texture consistency, and edge ratio are given below.
(1) Entropy of information
The information entropy reflects the number of image gray levels and the occurrence condition of each gray level pixel, and the higher the entropy value is, the more complicated the image texture is. The calculation formula of the image information entropy H is as follows:
n is the number of gray levels, NiK is the number of gray levels for the number of occurrences of each gray level.
(2) Gray scale uniformity
The gray consistency can reflect the uniformity of the image, and if the value is small, the gray consistency corresponds to a simple image, and conversely, the gray consistency corresponds to a complex image. The gray level consistency formula is:
where M, N are the number of rows and columns, respectively, of the image, f (i, j) is the gray value at pixel (i, j),is the mean of the gray levels of the 3 × 3 neighborhood pixels centered at (i, j).
(3) Edge ratio
The number of objects in the image directly reflects the complexity of the image, and if the number of objects is large, the image is generally complex, and vice versa. Since the counting of the target involves complicated graph segmentation and is inconvenient to calculate, the number of target edges indirectly reflects the number of targets in the image and the complexity thereof, and therefore, the counting can be used for describing the complexity of the image. The proportion of the target edge in the image can be described by an edge ratio, and the calculation formula is as follows:
wherein, M and N are the number of rows and columns of the image respectively, and E is the number of edge pixels in the image. Where the edge of the target in the image shows a significant change in gray scale, the edge can be obtained by a difference algorithm, and the edge pixel of the image is generally detected by an edge detection operator (such as Canny operator, Sobel operator, etc.).
The number of the high-resolution sample set image blocks is not less than 500000, the number of the medium-resolution image blocks is not less than 300000, and the number of the low-resolution image blocks is not less than 200000.
And step 3: respectively training three GAN networks with high, medium and low complexity by using the obtained sample set;
the loss function for GAN network training is defined as follows:
the loss function of GAN network training contains content loss, production-confrontation loss and total variation loss. Content loss characterizes the distortion of the image content, and the generation-confrontation loss describes the degree of distinction between the statistical properties of the generated result and data such as natural images, and total variation loss characterizes the continuity of the image content. The overall loss function consists of three loss function weights:
where w isv，wg，wtEach is a respective weight, which is determined experimentally.
The calculation method for each loss function is given below.
(1) Content loss
The traditional content loss function is expressed by MSE (mean square error of pixels), the loss of the image content is investigated pixel by pixel, and the high-frequency components on the image structure are diluted by network training based on the MSE, so that the image is over-blurred. To overcome this drawback, a feature loss function of the image is introduced here. Because the manual definition and the extraction of valuable image features are complex work, and the deep learning has the capability of automatically extracting the features, the method uses hidden layer features obtained by VGG network training for measurement. By phii,jRepresenting the characteristic graph obtained by the jth convolutional layer in front of the ith pooling layer in the VGG network, and defining the characteristic loss as a reconstructed imageAnd a reference imageThe euclidean distance of the VGG feature of (a), i.e.:
here Wi,j，Hi,jRepresenting the dimensions of the VGG feature map.
(2) Generating-fighting loss
The generation-confrontation loss takes into account the generative function of the GAN network, encouraging the network to produce a solution that is spatially consistent with the natural image manifold, so that the discriminator cannot distinguish the generated result from the natural image. The generative-confrontation loss is measured based on the discriminative probability of the discriminators for all training samples, as follows:
here, ,indicates that the discriminator D will reconstruct the resultJudging the probability of the natural image; n represents the total number of training samples.
(3) Total variation loss
The total variation loss is added to strengthen the local continuity of the learning result on the image content, and the calculation formula is as follows:
here, W and H denote the width and height of the reconstructed image.
And 4, step 4: and calculating the complexity of the input image, and selecting a corresponding GAN network for reconstruction according to the complexity.
The method specifically comprises the following substeps:
step 4.1: uniformly dividing an input image into 16 equal parts of subgraphs, calculating the complexity of each subgraph, and judging the subgraphs to belong to high, medium and low complexity types;
step 4.2: and selecting a corresponding GAN network according to the complexity type to perform super-resolution reconstruction.
The method classifies sample images according to the complexity of image contents, constructs and trains deep network models with different complexities, and selects a corresponding network for reconstruction according to the content complexity of input images to be over-classified. The remote sensing image records a large-scale range scene, and is not influenced by fine information of ground targets, and the space homogeneous region with consistent content complexity is more and large in area, such as large land features of urban areas, dry farmlands, paddy fields, lakes, mountainous regions and the like, so that the remote sensing image is more suitable for pre-classification training and reconstruction.
The GAN deep learning network model is adopted, not only is the best super-resolution performance given by the GAN network at present, but also the remote sensing images with high and low spatial resolutions serving as training samples are different in source and belong to multi-temporal images shot asynchronously, one-to-one alignment in pixel meaning cannot exist, so that the training of the CNN network is greatly limited, and the GAN network is an unsupervised learning network, so that the problem does not exist.
It should be understood that parts of the specification not set forth in detail are well within the prior art.
It should be understood that the above description of the preferred embodiments is given for clarity and not for any purpose of limitation, and that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A remote sensing image super-resolution reconstruction method based on a content-aware deep learning network is characterized by comprising the following steps:
step 1: collecting high and low resolution remote sensing image samples, and performing block processing;
step 2: calculating the complexity of each image block, dividing the image blocks into a high class, a middle class and a low class according to the complexity, and respectively forming a training sample set with high complexity, middle complexity and low complexity;
the complexity of the image block is calculated by the following method:
C＝wh×H+wu×U+we×R；
wherein C represents the complexity of the image block, H represents the entropy of image information, U represents the gray-scale uniformity of the image, R represents the edge ratio of the image, and w representsh，wu，weThe weights are respectively the respective weights, and the weights are determined by experiments;
and step 3: respectively training three GAN networks with high, medium and low complexity by using the obtained sample set;
wherein the loss function of the GAN network training is defined as:
wherein C represents a loss function of network training,a function representing the loss of content is represented,the expression generates-a function of the penalty of confrontation,representing a total variation loss function; w is av，wg，wtThe weights are respectively the respective weights, and the weights are determined by experiments;
and 4, step 4: calculating the complexity of an input image, and selecting a corresponding GAN network for reconstruction according to the complexity;
the specific implementation of the step 4 comprises the following substeps:
step 4.1: uniformly dividing an input image, calculating the complexity of each sub-image, and judging the types of high, medium and low complexity;
step 4.2: and selecting a corresponding GAN network according to the complexity type to perform super-resolution reconstruction.
2. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network according to claim 1, characterized in that: in step 1, the high resolution image is evenly sliced into 128x128 image blocks and the low resolution image is evenly sliced into 64x64 image blocks.
3. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network according to claim 1, wherein the calculation formula of the image information entropy H is as follows:
wherein N is the number of gray levels, NiK is the number of gray levels for the number of occurrences of each gray level.
4. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network according to claim 1, wherein the image gray level consistency U formula is as follows:
where M, N are the number of rows and columns, respectively, of the image, f (i, j) is the gray scale value at pixel (i, j),is the mean of the gray levels of the 3 × 3 neighborhood pixels centered at (i, j).
5. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network according to claim 1, wherein the image edge ratio R is calculated by the following formula:
wherein M and N are the number of rows and columns of the image respectively; and E is the number of edge pixels in the image and is obtained by a difference algorithm.
6. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network according to any one of claims 1 to 5, characterized in that: and 2, the training sample sets with high, medium and low complexity are obtained, wherein the number of the image blocks of the training sample set with high complexity is not less than 500000, the number of the image blocks of the training sample set with medium complexity is not less than 300000, and the number of the image blocks of the training sample set with low complexity is not less than 200000.
7. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network as claimed in claim 1, wherein the content loss functionComprises the following steps:
wherein phi isi,jRepresenting a characteristic diagram obtained for the jth convolutional layer preceding the ith pooling layer in a VGG network, Wi,j，Hi,jDimensions representing a VGG feature map;which represents a reference image, is shown,representing the reconstructed image.
8. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network as claimed in claim 1, wherein the generation-confrontation loss functionComprises the following steps:
wherein,representing a reconstructed image, D (G (I)LR) Means D for reconstructing the resultJudging the probability of the natural image; n represents the total number of training samples.
9. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network of claim 1, wherein the total variation loss functionComprises the following steps:
wherein, G (I)LR) Representing the reconstructed image and W, H representing the width and height of the reconstructed image.
10. The remote sensing image super-resolution reconstruction method based on the content-aware deep learning network according to claim 1, characterized in that: in step 4.1, the input image is divided evenly into 16 equal parts of subgraphs.
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