Batik image retrieval using convolutional neural network

TELKOMNIKA, Vol.17, No.6, December 2019, pp.3010~3018
ISSN: 1693-6930, accredited First Grade by Kemenristekdikti, Decree No: 21/E/KPT/2018
DOI: 10.12928/TELKOMNIKA.v17i6.12701 ◼ 3010
Received March 18, 2019; Revised July 2, 2019; Accepted July 18, 2019
Batik image retrieval using convolutional
neural network
Heri Prasetyo*1
, Berton Arie Putra Akardihas2
Department of Informatics, Universitas Sebelas Maret (UNS), Surakarta, Indonesia
*Corresponding author, e-mail: heri.prasetyo@staff.uns.ac.id1
, bertonarie123@student.uns.ac.id2
Abstract
This paper presents a simple technique for performing Batik image retrieval using
the Convolutional Neural Network (CNN) approach. Two CNN models, i.e. supervised and unsupervised
learning approach, are considered to perform end-to-end feature extraction in order to describe the content
of Batik image. The distance metrics measure the similarity between the query and target images in
database based on the feature generated from CNN architecture. As reported in the experimental section,
the proposed supervised CNN model achieves better performance compared to unsupervised CNN in
the Batik image retrieval system. In addition, image feature composed from the proposed CNN model
yields better performance compared to that of the handcrafted feature descriptor. Yet, it demonstrates
the superiority performance of deep learning-based approach in the Batik image retrieval system.
Keywords: autoencoder, CNN, deep learning, feature extraction, image retrieval
Copyright © 2019 Universitas Ahmad Dahlan. All rights reserved.
1. Introduction
The brain is an amazing organ in the human body. With our brains, we can understand
what we see, smell, taste, hear and touch. The infant brain weight is only about half a kilogram
but can solve a big problem, and even supercomputers cannot. After several months of birth,
the baby can recognize the face of his parents, discern discrete objects from the background,
and begin to speak. Within one year the baby has an intuition about natural objects, can follow
objects and understand the meaning of a sound. When they are children, they can understand
grammar and have thousands of words in their vocabulary.
Building machines that have intelligence like our brains are not easy, to make machines
with artificial intelligence we have to solve very complex computing problems that we have even
struggled with, problems that our brains can solve in a matter of seconds. To overcome this
problem, we have to develop other ways to program computers that have been used in this
decade. Therefore there arises an active field of artificial computer intelligence and also
commonly called deep learning [1].
Nowadays Artificial intelligence has undergone very rapid development. Ai has been
used in many fields of research, in the field of computer vision Content-Based Image Retrieval
(CBIR) has been developed in multi-level schemes with low-level features to high-level features.
Convolutional Neural Network (CNN) has been successfully used to be an effective descriptor
feature and gain accurate results. In general, the features gain by the deep learning method are
trained by mimic human perceptions through various operations such as convolution and
pooling. Deep learning has become a descriptor feature that is better than low-level features.
Although now the CNN module has become state of the art in computer vision this does not
guarantee the features obtained from the highest level always get the best performance [2].
In the Content-Based Image Retrieval system aims to provide the right way to do
the browsing, retrieving and searching some desired images that have been stored in the image
database. The image database contains many images that have been stored and arranged in
a storage device. Usually, the size of the image database is very large so that the process of
searching for specific images manually requires a lot of time, and causes conditions that are
uncomfortable for the user. For example, Batik is a cultural heritage of the archipelago
Indonesia that has a high value and blend of art, laden with philosophical meanings
and meaningful symbols that show the way of thinking of the people making it. Batik is a craft
that has been a part of Indonesian culture especially Javanese for a long time, batik have

TELKOMNIKA ISSN: 1693-6930 ◼
Batik image retrieval using convolutional neural network (Heri Prasetyo)
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a lot of motives, pattern and color so to take specific batik picture from the database very
challenging [3].
This paper offers a solution to use convolutional neural networks to carry out
CBIR tasks to solve problems that occur in taking batik images. The method intended is
to produce effective image descriptors from the CNN architecture. Descriptors of this feature
are very important for content-based shooting systems. The Image feature is used to improve
the performance and to solve problems in existing batik shooting systems.
2. Content-based Image Retrieval System
Image retrieval is a computer system for searching and retrieving a specific image
in large or big size of image databases. The classical approach appends on the metadata
such as texts, keywords, or descriptions embedded in an image. Thus, the image retrieval
can be performed with the search key as aforementioned text, keywords, etc. This technique
is inefficient since the manual image annotations are time-consuming and exhausting
process. Even though, large amounts of automatic images annotations have been proposed in
literature [4], an image retrieval system with content annotation still cannot deliver
satisfactory result.
CBIR is computer application dealing with the searching problems over large-scale
image database. CBIR, also recognized as Query-Based Image Content (QBIC) and
Content-Based Visual Information Search (CBVIR), differs with the content-based approach.
The CBIR analyzes the image content rather than metadata information such image keywords,
tags, or image descriptions [5].
In this paper, the usability of CNN model is extended to the CBIR task. The main reason
is the superiority performance offered by CNN model compared to the handcrafted feature in
the computer vision and recognition tasks. The CNN or Deep Learn network achieves
the outstanding retrieval performance in the ImageNet challenge [6]. The CNN model inspires
the other deep learning-based approaches, such as AlexNet [7], VGGNet [8], GoogleLeNet [9],
Microsoft ResNet [10], etc., to tackle the obsolete of handcrafted feature in the image
retrieval domain.
The CNN model receives a three-dimensional image of size ℎ × 𝑤 × 𝑑, where ℎ and 𝑤
are spatial dimensions and 𝑑 is the number of channels. This image is further processed
thorough the CNN architecture consisting several convolutions, max-poolings, and activation
functions to perform end-to-end image feature generation. Let 𝑋𝑖𝑗 be a vector data located at
spatial position (𝑖, 𝑗) in specific layers. The CNN computes a new data 𝑌𝑖𝑗 as follow:
Yij = fks({Xsi+δi,sj+δj} 0≤δi,δj<k) (1)
where 𝑘 and 𝑠 denote kernel size and stride, respectively. The function 𝑓𝑘𝑠 is the layer type used
such as matrix dot multiplication for convolutional layers, max spatial for max pooling layers,
nonlinear functions for activation functions, and other types of layers. This form of functionality is
maintained using kernel size and step composition while still using the transformation rules.
fks°gk′s′ = (f°g)k′+(k−1)s′,ss′ (2)
While a general network computes general nonlinear functions, a network with only
layers of this form computes a nonlinear filter, which we call a deep filter or fully convolutional
network. FCN naturally operates at any size input and produces the appropriate spatial
dimensions. The loss function is valued composed with the FCN defines task. If the loss
function is a sum over the spatial dimensions of the final layer 𝑙(𝑥; 𝜃) = ∑ 𝑙′
𝑖𝑗 (𝑥𝑖𝑗; 𝜃),
the parameter gradient will be a sum over the parameter gradients of each of its spatial
components. Thus stochastic gradient on 𝑙 computed on whole images will be the same as
the stochastic gradient on 𝑙′, taking all the final receptive fields as minibatch. When calculating
this receptive field is done repeatedly with forward and backward propagation operations
feedback will be more effective if the calculation is done layer by layer in all images compared to
computing patch by patch to the part of the image. An illustration of a CNN operation can be
seen in Figure 1.

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TELKOMNIKA Vol. 17, No. 6, December 2019: 3010-3018
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The proposed CNN model constructs the feature descriptor from Batik image. This
feature descriptor is to measure the similarity between query and target images in database
under the K-Nearest Neighbors (KNN) [11] strategy. This KNN technique performs similarity
matching with the distance score criterion. This paper investigates two CNN models in
the training stage, i.e. with supervised and unsupervised learning approaches. Figure 1
illustrates an example of proposed supervised CNN architecture for Batik image retrieval.
The supervised terminology refers to the utilization of class label, whereas unsupervised
disobeys the image label in the training process. Autoencoder is simple example of
unsupervised CNN method which compresses the data features into smaller size and recovers
back to the original data [12].
Figure 1. Ilustration operation using CNN
3. Method
This section presents two methods for generating the feature descriptor in the Batik
image retrieval system. We firstly explain the supervised CNN model. Then, the unsupervised
CAE model [13] is subsequently described in this section.
3.1. Supervised Learning
The CNN model is the supervised deep learning-based approach commonly used in
the image classification [14], prediction [15], segmentation, analysis [16], etc. The supervised
CNN model consists of several layers such as convolutional layer, max pooling layer, etc.
These layers are repeated over several times and fed into the fully connected layer at the end of
CNN layer [17]. Our proposed image retrieval system employs the CNN architecture with six
convolutional layers and two fully connected layers to generate Batik feature descriptor. Table 1
summarizes the CNN architecture used in our proposed method.
Table 1. The Supervised CNN Architecture for Batik Image Retrieval
Layer Type Size Output Shape
Input (128,128,3) -
Convolutional + Relu 8 (3x3) filters, 1 stride, 2 padding (128,128,8)
Max Pooling 8 (2x2) filters, 2 stride, 0 padding (64,64,8)
Flatern + Dropout (30%) (1,1,1024) 1024 neurons 256
Dense 256 neurons 97
Softmax 97 way 97

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After performing six convolution and max-pooling operations, an input image of size
128 × 128 × 3 is converted into new representation with dimensionality 2 × 2 × 256. This new
data representation is then flatten to become one dimensional data of size 1 × 1 × 1024. This
flatten data is subsequently processed and trained with the Multi-Layer Perceptron (MLP).
Herein, the MLP receives 1024 input feature and feeds into 1024 input neurons. The hidden and
output layers are set as 256 and 97, respectively. The value of 97 in output layers is equivalent
to that of the desired class target, i.e. the number of Batik image classes used in the proposed
image retrieval system.
3.2. CAE Unsupervised Learning
This paper also considers the other CNN model, namely Convolutional Auto-Encoder
(CAE), for generating image feature. The CAE is an unsupervised deep learning-based method,
i.e. the image label is not required in the training process. In order to generate image feature,
this technique learns and captures the information from input data directly without the availability
of class label.
The CAE involves two parts, i.e. encoder and decoder blocks. The encoder block
processes the sample data 𝑋 consisting 𝑛 samples and 𝑚 features to yield the output 𝑌. In
the opposite side, the decoder aims to reconstruct the original sample data 𝑋 from the 𝑌. Let 𝑋′
be the reconstructed data produced at the decoder side. The main goal of CAE is to minimize
the difference between the original data 𝑋 and reconstructed version 𝑋′. Specifically,
the encoder simply maps the input 𝑋 into new representation 𝑌 with the help of function 𝑓. This
process can be formulated as follow:
Y = f(X) = sf (WX + bX) (3)
where 𝑠𝑓 denotes the nonlinear activation function in encoder side. CAE simply performs
a linear operation if one simply uses identity function for 𝑠𝑓. The 𝑊 and 𝑏 𝑋 ∈ 𝑅 𝑛
are encoder
parameters, respectively, referring as weight matrix and bias vector. In contrast, the decoder
reconstructs 𝑋′ from 𝑌 representation by means of function 𝑔. This process can be simply
illustrated as:
X′
= g(Y) = sg (W′
Y + bY) (4)
where 𝑠𝑔 represents the activation function in decoder side. The 𝑏 𝑌 and 𝑊 are the bias vector
and weight matrix, respectively, denotingas decoder parameter.
Strictly speaking, the CAE model searches the global or near optimum
parameter = (𝑊, 𝑏 𝑋, 𝑏 𝑌) in the training process. This task is equivalent to the minimization
process of loss function over all dataset 𝑋 under the following objective function:
θ = min
θ
L(X, X′) = min
θ
L(X, g(f(X))) (5)
where 𝐿(∙,∙) denotes the auto-encoder loss function. In this paper, we simply use linear
reconstruction 𝐿2 for loss function, or commonly referred as Mean Squared Error (MSE) [18].
This loss function is formally defined as:
L2(θ) = ∑‖xi − xi
′
‖2
n
i=1
= ∑‖xi − g(f(xi))‖
2
n
i=1
(6)
where 𝑥𝑖 ∈ 𝑋, 𝑥𝑖
′
∈ 𝑋′ and 𝑦𝑖 ∈ 𝑌, respectively denote the original input data, reconstructed data,
and new compact representation of input data.
In this paper, the CAE architecture was built with four encoding blocks and four
decoding stages. This architecture includes a stacked Convolutional Auto-Encoder.
The summary of CAE architecture used in this paper can be seen in Table 2. Suppose that an
input image is of size 128 × 128 × 3. As it can be inferred from Table 2, this image is convolved
four times to obtain new simpler and compact representation. This process can be also
considered as repetitive encoding. Herein, the new representation is regarded as neural code

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with dimensionality 4 × 4 × 128. By using the backward approach and decoding process, this
neural code can be recovered back to yield the reconstructed image of original size
128 × 128 × 3. This reverse process performs the deconvolution and unpooling operations.
The CAE neural code can be further utilized as the feature descriptor in the proposed Batik
image retrieval system.
Table 2. The CAE Architecture for Batik Image Retrieval System
Layer Type Size Output Shape
Input (128,128,3) -
Max Pooling + Dropout 32 (2x2) filters, 2 stride, 0 padding (64,64,32)
Max Pooling (Neural Code) 128 (2x2) filters, 1 stride, 2 padding (4,4,128)
Unpoling 128 (2x2) filters, 2 stride, 0 padding (8,8,128)
Deconvovution + Relu 128 (3x3) filters, 1 stride, 2 padding (8,8,128)
Unpooling + Dropout 128 (2x2) filters, 2 stride, 0 padding (16,16,128)
Deconvovution + Sigmoid 32 (3x3) filters, 1 stride, 2 padding (128,128,3)
3.3. Learning process and Hyperparemeter Tuning
The CNN model is very sensitive to hyperparameter changes in the learning process,
since it utilizes the Restructured Linear Unit (ReLu) 𝑓(𝑥) = 𝑚𝑎𝑥(0, 𝑥) for its activation function.
This function is with the gradient descent making it very unstable in comparison with the tanh
and sigmoid activation functions. Compared to the aforementioned activation functions, ReLu
yields an identical error with 25% less iteration in learning stage [7].
In the training process of our proposed image retrieval system, we simply split
the image dataset as two folds, i.e. 75% and 25% for training and testing purpose, respectively.
The Adaptive Moment Estimation (Adam) [19] is exploited for CNN optimizer with learning rate
0.0001. We simply employ the Mean Square Error (MSE) [20] for calculating the loss function.
For avoiding the overfitting problem and dealing with small size of dataset, the proposed system
uses data augmentation technique to improve the data variation. The training and testing
processes are conducted under the Intel Core i5 2010 processor. From our experiment,
the supervised CNN and CAE models require around 10 hours and 3 days, respectively, for
the training process. At the end of training process, two deep learning based models produce
a set of image features which can be used for the descriptor in the Batik image retrieval. These
image features are simply obtained from the last layer and neural code layer of supervised CNN
and CAE models, respectively.
4. Experimental Study
Extensive experiments were carried out to investigate and examine the proposed
method performance in the Batik image retrieval system. Firstly, we give a brief description
about the image dataset used in the experiment. The effectiveness of the proposed method is
subsequently observed under visual investigation. Then, the objective performance
comparisons are further evaluated to overlook the effect of different distance metrics and
superiority of the proposed method in comparison with the former competing schemes.
4.1. Dataset
This experiment utilizes a set of Batik images, refered as Batik image dataset, over
various patterns, colors, and motifs. This image database consists of 1552 image. This
database is further divided into 97 image classes. Each class contains a set of similar images

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regarding to their motifs and content appearance. Each image class owns 16 similar images, in
which all images belonging to the same class are considered as similar images. Figure 2 gives
several examples of Batik images from the dataset.
4.2. Practical Application on Batik Image Retrieval
This sub-section evaluates the performance of the proposed method under visual
investigation. The proposed method utilizes the image feature obtained from CNN and CAE
approach for performing Batik image retrieval system. The correctness of the proposed method
is determined whether the system returns a set of retrieved images correctly or not.
Figure 3 displays the retrieved images returned by the proposed image retrieval system
using the CNN and CAE image features. We only show six-teen retrieved images arranged in
ascending manner based on their similarity score. The similarity criterion is measured using the
distance score and given at the top of each image. Smaller distance value indicates more
similar between the query and target image in database. As shown in this figure, the proposed
method with CNN feature returns all retrieved images correctly. It is little regrettable that
the proposed method with CAE feature only produces six retrieved images correctly.
Figure 2. Some image samples in the Batik dataset
(a) (b)
Figure 3. Performance evaluation in terms of visual investigation
for the proposed method with: (a) CNN, and (b) CAE image feature

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4.3. Comparison of Porposed Methods with Direfferent Distance Metrics
This sub-section reports the effect of different distance metrics on the proposed method.
In this experiment, three distance metrics, namely Euclidean [21], Manhattan [22],
and Bray-Curtis distance [23], are extensively examined over two performance criterion,
i.e. precision and recall rate. These two scores are formally defined as:
pi(n) =
RV
n
(7)
ri(n) =
RV
M
(8)
where 𝑝𝑖(𝑛) and 𝑟𝑖(𝑛) denotes the precision and recall rate, respectively, if image 𝑖 is turned as
query image. The symbols 𝑛 and 𝑀 represent the number of retrieved images and total images
in database which is relevant to image 𝑖, respectively. 𝑅 𝑉 is the number of images which are
relevant to query image 𝑖 obtained at 𝑛 retrieved images.
Figure 4 shows the performance comparison over various distance metrics in terms of
Precision and Recall scores. All images in database are chosen as query image. The number of
retrieved images are set as 𝑛 = {1,2, … ,16}. In most cases, Bray-Curtis distance yields the best
retrieval performance compared to that of the other distance metrics for both CNN and CAE
image feature. In the Batik image retrieval system, the Bray-Curtis distance becomes a good
candidate for measuring the similarity between the query and target images in database.
Table 3 tabulates more complete comparsions for the proposed image retrieval system
using CNN and CAE features over various distance. This comparison is evaluated in terms of
average recall rate with the number of retrieved images as 𝑛 = 16. Herein, all images in
database are turned as query image. As reported in this table, the proposed method with
supervised CNN delivers better performance compared to that of CAE technique. The image
feature obtained from proposed supervised CNN method is more suitable for Batik image
retrieval task.
(a) (b)
Figure 4. Performance comparisons in terms of precision and recall rates
over various distance metrics with the image features from: (a) CNN, and (b) CAE method
4.4. Comparison against Former Methods
This sub-section summarizes the performance comparison between the proposed
supervised CNN method and former existing schemes on Batik image retrieval system. This
comparison is conducted in terms of Average Precision Recall (APR) score. The APR is
formally defined as:

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𝐴𝑃𝑅 =
1
𝑁
∑ 𝑟𝑖(𝑛)
𝑁
𝑖=1
(9)
where 𝑟𝑖(𝑛) and 𝑁 are the recall rate for query image 𝑖 and the total number of images in
database, respectively. Herein, all images in database are turned as query image indicating that
𝑁 = 1552. Thus, the APR value is averaging over all query images. The number of retrieved
images is set as 16 yielding 𝑛 = 16. To make a fair comparison, this experiment also
investigates the dimensionality of image feature.
Table 4 reports the performance comparison in terms of feature dimensionality and APR
value. As shown in this table, the proposed supervised CNN yields the best performance in
comparison with the other competing schemes. It is noteworthy that the proposed method
requires lowest feature dimensionality (with exceptional on comparison to LBP [20] scheme).
This lower dimensionality indicates the faster process on KNN searching for effective Batik
image retrieval system. Thus, the proposed method can be considered on implementing
the Batik image retrieval and classification system.
Table 3. APR CNN and CAE
Method Euclidean Manhattan Bray-curtis
CNN 0.9938 0.9931 0.9947
CAE 0.6737 0.6387 0.7654
Table 4. APR Comparison with Former Method
Method Feature Size APR (%)
LBP [24] 59 92.57
LTP [25] 118 95.65
CLBP [26] 118 95.17
LDP [27] 236 93.52
Gabor Filter [28] 144 96.55
ODBTC+PSO [3] 384 97.68
Proposed Supervised CNN 97 99.47
5. Conclusions
A new content-based image retrieval system has been presented in this paper. This
system achieves the retrieval accuracies 99.47% and 76.54%, respectively, while the image
feature is constructed from CNN and CAE deep learning-based architecture on Batik image
database. The CNN outperforms the former existing schemes in terms of retrieval accuracy.
In addition, it requires the lowest image features, i.e. 97 feature dimensionality, compared to
other methods. For future work, a slight modification can be carried out for CAE model by
adding fully-connected layers before and after the neural code section. This scenario may
reduce the dimensionality of image feature, at the same time, it improves the performance for
Batik image retrieval.
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