Lossless 4D Medical Images Compression Using Adaptive Inter Slices Filtering

International Journal of Advances in Applied Sciences (IJAAS)
Vol. 7, No. 4, December 2018, pp. 361~368
ISSN: 2252-8814, DOI: 10.11591/ijaas.v7.i4.pp361-368  361
Journal homepage: http://iaescore.com/journals/index.php/IJAAS
Lossless 4D Medical Images Compression Using Adaptive Inter
Slices Filtering
Leila Belhadef, Zoulikha Mekkakia Maaza
Department d’Informatique, Laboratoire SIMPA, Faculté des Mathématiques et d’Informatique, Université des Sciences
et de la Technologie d’Oran Mohamed Boudiaf, USTO-MB, BP 1505, El Mnaouer, 31000 Oran, Algérie
Article Info ABSTRACT
Article history:
Received May 21, 2018
Revised Aug 5, 2018
Accepted Aug 29, 2018
Recent lossless 4D medical images compression works are based on the
application of techniques originated from video compression to efficiently
eliminate redundancies in different dimensions of image. In this context we
present a new approach of lossless 4D medical images compression which
consists to application of 2D wavelet transform in spatial directions followed
or not by either lifting transform or motion compensation in inter slices
direction, the obtained slices are coded by 3D SPIHT. Our approach was
compared with 3D SPIHT with/without motion compensation. The results
show our approach offers better performance in lossless compression rate.
Keyword:
3D SPIHT
4D medical image
Integer wavelet transform
Lossless compression
Motion compensation Copyright © 2018 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Leila Belhadef,
Department d’Informatique, Laboratoire SIMPA, Faculté des Mathématiques et d’Informatique,
Université des Sciences et de la Technologie d’Oran Mohamed Boudiaf, USTO-MB
BP 1505, El Mnaouer, 31000 Oran, Algérie
Email: leila.belhadef@univ-usto.dz
1. INTRODUCTION
4D medical images represent voluminous data where each image is composed by a set of volumes
representing the 3D images of a human body part at different instants t, each 3D image is in turn composed by
a set of slices. In the literature a lot of lossless 4D medical images compression works are realized to reduce
images size without data loss in order to avoid diagnosis errors. Considering 4D image as a set of volumes
evolving in time, the recent lossless 4D medical images compression techniques apply the techniques of video
compression such as motion compensation in order to efficiently removing inter slices or volumes
redundancies.
Based on the advanced video coding H.264/AVC Sanchez et al. [1] described two coding methods for
lossless 4D medical images compression. The first method exploits the redundancies among the 2D slices in
(each volume) third dimension𝑧. The second method exploits the similarities between the slices in the fourth
dimension time 𝑡. Redundancies through the fourth dimension are more numerous than redundancies through
the third dimension; therefore this is the second method which permitted better compression ratio.
For more exploit the redundancies in the four dimensions of medical images the same authors of the
precedent work proposed a new compression technique based on H.264/AVC [2] as in precedent work. So in
this compression technique multi-frame motion compensation is applied firstly in 𝑧 dimension to each volume.
The obtained reference and residual slices are treated secondly also by multi-frame motion compensation in
temporal dimension, thus the redundancies are reduced in 𝑧 and 𝑡 dimensions. The final residual slices and
motion vectors are compressed by entropy coding.
Here multi-frame motion compensation applied to a set of 𝑛 slices consists to consider first slice as
reference slice intra coded and 𝑛 − 1 slices as inter slices which are inter coded by variable block matching

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and multi-frame motion compensation where each block of inter slices can be predicted from multi reference
slices in 𝑧 dimension in its first application and 𝑡 dimension in its second application.
Martin et al. proposed in [3] a new method of 4D medical images compression also based on the
H.264 video coding where predicted slices are generated by using spatio-temporal reference slices from 𝑧 and
temporal neighborhood, where differently to precedent technique which realizes prediction in 𝑧 dimension
followed by prediction in 𝑡 dimension, this technique realizes spatio-temporal prediction where each block of
inter slice can be predicted from multi reference slices in spatio-temporal neighborhood, this permits to obtain
a good results in compression compared prediction in 𝑧 dimension or prediction in time dimension.
All the previous cited works (based on H.264 video coding) don’t integrate progressive lossy to
lossless decoding in their schemes. Other techniques apply wavelet transform indeed it can be combined with
image compression technique as fractal to improve time coding [4] also wavelet transform is very effective in
medical image and video compression thus a lot of works are proposed as in [5] the authors presented color
video medical compression technique by using geometric wavelet in order to eliminate efficiently similarity in
each frame composed the video sequence with good image quality but without exploiting the temporal
redundancies.
The first proposed works based on wavelet transform in literature for lossless 4D medical images
compression do not integrate motion compensation in compression scheme thus in [6] the authors compared
three techniques using JPEG2000. The first technique consists to apply 2D wavelet transform to each slice
composed the volumes and compress it separately by using JPEG2000. The second technique is represented
by two variants: the first variant is application of 1D wavelet transform in 𝑧 dimension, the second variant is
application of 1D wavelet transform in 𝑡 dimension and for both variants the obtained slices are compressed
by JPEG2000. The third technique is application of 1D wavelet transform in 𝑡 dimension flowed by 1D wavelet
transform in 𝑧 dimension the obtained slices are compressed by JPEG2000. The exploitation of temporal
dimension in second and third technique provides better results in compression rate because the numerous
similarities in temporal dimension.
Due to efficiency of the motion compensation in the video compression scheme to reduce temporal
redundancies Kasim et al. [7] proposed a wavelets compression technique of 4D medical images based on
motion compensation and integer wavelet transform, here the 4D image is compressed as a sequence of 3D
images. This technique consists to achieve 3D motion compensation in order to eliminate efficiently similarities
existing between volumes in temporal direction, after the resulting volumes are decorrelated by 3D integer
wavelet transform. The obtained data are coded by 3D SPIHT. This method allows lossless coding and
progressive lossy to lossless decoding.
The first step is motion estimation inter 3D images. Where a group of 𝑛 3D images are represented
by one key image (the first image in a group is compressed without motion compensation) and 𝑛 − 1 inter
images. Each current image (at position 𝑡) to be predicted is divided in cubes for each cube it most similar cube
in reference image (at position 𝑡 − 1) is found. The difference between the position of current cube and it most
similar cube is motion vectors and the difference between those cubes generates the residual image.
Thus the results of this step are 3D key image, 𝑛 − 1 3D residual images and corresponding motion
vectors. To reconstruct the initial group of images, the key image and the corresponding motion vectors is used
to obtain predicted image which permits to reconstruct the first inter image by adding the predicted image to
the first residual image, the followed inter images at position 𝑡 are reconstructed as the first one by using inter
image at position 𝑡 − 1 and corresponding motion vectors. The second step consists to apply 3D integer wavelet
transform to key image and residual images and in final step the key and residual images are coded by using
3D SPIHT, also the motion vectors are entropy coded. This technique permits to realize lossless compression
and progressive lossy to lossless decoding by transmission a part of bit stream of key images followed by a
part of bit stream of each inter image this permits to improve progressively the image quality in decompression.
All cited works of 4D medical image compression try to eliminate the redundancies by using different
prediction techniques in 𝑡 and 𝑧 dimensions either by applying motion compensation or by applying wavelet
transform or by applying both motion compensation flowed by wavelet transform.
In this paper we propose a new lossless compression approach based on adapted filtering in inter slices
direction to improve the elimination of redundancies in 4D medical images. This approach consists to apply
2D integer wavelet transform to each slices followed or not by either wavelet filter or motion compensation in
inter slices direction. The obtained slices are coded with 3D SPIHT. The experimental results are compared to
two approaches: 3D SPIHT using motion compensated temporal filter in inter slices direction and 3D SPIHT
(without motion compensation), the obtained lossless compression rates show our approach outperforms two
other approaches. The rest of the paper is organized as follows. The section 2 presents prediction techniques
used in video compression. The section 3 details the proposed approach of compression. In the section 4 the

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Lossless 4D Medical Images Compression Using Adaptive Inter Slices Filtering (Leila Belhadef)
363
experimental results for lossless compression are compared to other compression approaches. In final section
conclusions are presented.
2. MOTION COMPENSATION AND TEMPORAL FILTERING
The principals video compression techniques used in 4D medical images compression are represented
by two types of technique: H.264/AVC video coding and wavelet video coding. These techniques are based on
motion compensation to eliminate the redundancies as in H.264/AVC coder the motion compensation is applied
by using the block matching to attain the minimum prediction error which is the minimum difference between
current block (to be predicted) and reference block in search window, also the reference blocks can be
determined from multi reference images with variable block size.
The lossless 4D compression techniques based on H.264/AVC offer good compression rate but
without permitting the progressive decoding, the alternative is the wavelet techniques which produce scalable
flux and realize good decorrelation of signal as presented in [7] where the progressive decoding is obtained by
reordering of bit stream, the progressive decoding can be also obtained by using temporal scalability but it is
not used here cause the motion compensation and wavelet transform is achieved separately.
In order to obtain temporal scalability and efficiency eliminate temporal redundancies the recent
wavelet video coding apply the wavelet transform in motion trajectory by using motion compensated temporal
filtering (MCTF). In wavelet video coding the MCTF can be applied before spatial decorrelation with wavelet
transform (t+2D) or after spatial decorrelation in wavelet domain (2D+t or in-band) flowed by entropy coding.
The first works in video compression [8], [9] integrated Haar motion compensated temporal filtering
where the images are separated in even images and odd images, the even images are low pass filtered and the
odd images are high pass filtered, the obtained low pass images are also separated in even images and odd
images and filtered till the temporal level decomposition is done. The filtering is realized in temporal trajectory
determined by motion compensation to reduce the energy in obtained high pass filtered images. With the
emergence of lifting scheme for the calculation of the integer wavelet coefficients, other works were carried as
in [10] the authors defined two filters: motion compensated Haar lifting filter and motion compensated 5/3
lifting filter ; the use of motion compensated 5/3 lifting filter gave the best results.
The scheme lifting is achieved using two steps prediction and update: the prediction step retains
difference between two samples of signal (high pass filtering) and the update step retains the average therefore
an approximation of signal (low pass filtering).
In [11] the authors introduced the motion compensated truncated 5/3 lifting filter where only the
prediction step of lifting is performed, thus each high pass filtered image is obtained by determining the
prediction error from neighbor reference images forward and backward. We propose an adaptive prediction in
order to ameliorate lossless 4D medical images compression rate, we apply either 5/3 truncated lifting filter or
motion compensated, if one of them minimize prediction error in inter slices direction.
3. PROPOSED COMPRESSION SCHEME
The first step of our scheme is formation of GOS (Group Of Slices) from 4D medical image followed
by application of 2D integer wavelet transform (2D IWT) in spatial directions (𝑥, 𝑦) of each slices, the second
step is inter slices filtering of each GOS and the final step is coding of obtained slices, motion vectors and
etiquettes. As shown in Figure 1 proposed compression scheme.
Figure 1. Proposed compression scheme
We describe these steps in the following points.

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3.1. Construction of GOS and spatial transform
The GOS are formed from the slices of 4D medical image (𝑥,𝑦,𝑧,𝑡) as shows in Figure 2(a). This
construction permits to obtain a set of GOS representing 4D medical image with each GOS is composed with
nearest slices in spatial direction 𝑧 across time.
Figure 2. (a) 4D Image composed by 3 volumes. (b) Construction of GOS composed by 16 slices (in
gray)
In Figure 2(b) the slices in gray represent the first GOS with 16 slices of 4D image composed by 3
volumes, thus all GOS of 4D image are also formed with follow slices in the same direction used for the first
GOS (across time), as the second GOS starts with slice 17. Next the formation of GOS each slice is transformed
by 2D integer wavelet transform using lifting scheme [12] in spatial directions (𝑥, 𝑦). This transform is
reversible; it allows producing integer wavelet coefficients which permits lossless compression.
3.2. Inter Slices Filtering
After spatial transform each obtained GOS is filtered by the proposed filter in inter slices direction
based on truncated lifting scheme and motion compensation. The motion compensated truncated 5/3 lifting
filter proposed in [11] is realized by application of the truncated lifting scheme and motion compensation in
the same time, the truncated lifting scheme achieves only prediction step of lifting scheme. The motion
compensated truncated 5/3 lifting filter (MC Trunc 5/3) for the block Sk [m, n] can be formulated as:
𝑅[𝑚, 𝑛] = 𝑆 𝑘[𝑚, 𝑛] − ⌊0.5 × (𝑆 𝑘−1[𝑚 − 𝑑1𝑚, 𝑛 − 𝑑1𝑛] + 𝑆 𝑘+1[𝑚 − 𝑑2𝑚, 𝑛 − 𝑑2𝑛])⌋ (1)
Where Sk-1, Sk+1 : reference slices, and Sk: inter slice.
R: residual slice (high pass slice).
(d1m, d1n): motion vector of block Sk [m, n] to a position in Sk-1.
(d2m, d2n): motion vector of block Sk [m, n] to a position in Sk+1.
.
: corresponds to round operator.
The motion compensation is realised by using block motion model so each inter slice (to be predicted)
is divided in blocks and each block is filtered by MC Trunc 5/3. This filter achieves bi-directional motion
compensation thus for each current block in Sk it most similar block is determined in Sk-1 and in Sk+1 and the
difference between the position of current block and these blocks represents motion vectors, the criteria of
similarities used is minimum sum of absolute differences (SAD). Thus each inter slice is replaced by two
motion fields as shows in Figure 3(a) and residual slice.

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(a) (b)
Figure 3. Motion fields: (a) predicted block with MC Trunc 5/3, (b) proposed approach with 1:
unfiltered block(E1), 2: predicted block with truncated 5/3 lifting transform(E2), 3: predicted block with
motion compensated(E3)
In our scheme each inter slice (to be predicted) is divided in block and each block is either unfiltered
or filtered by one of following prediction techniques: Truncated 5/3 lifting transform or motion compensation.
This filtering can be represented by three following prediction errors:
The unfiltered block Sk[m,n]:
𝐸1[𝑚, 𝑛] = 𝑆 𝑘[𝑚, 𝑛] (2)
The truncated 5/3 lifting transform (without motion compensation):
𝐸2[𝑚, 𝑛] = 𝑆 𝑘[𝑚, 𝑛] − ⌊0.5 × (𝑆 𝑘−1[𝑚, 𝑛] + 𝑆 𝑘+1[𝑚, 𝑛])⌋ (3)
The motion compensated prediction:
𝐸3[𝑚, 𝑛] = 𝑆 𝑘[𝑚, 𝑛] − 𝑆 𝑘−1[𝑚 − 𝑑 𝑚, 𝑛 − 𝑑 𝑛] (4)
Where (dm, dn): motion vector of block Sk [m, n] to a position in Sk-1.
Between the three prediction errors the minimum is chosen for determining the prediction error of this
block Sk[m,n] and its prediction method.
The prediction error E1 represents the unfiltered block Sk[m,n], the prediction error E2 represents
prediction step in 5/3 lifting transform and the prediction error E3 is the difference between block Sk[m,n] and
it most similar block in slice Sk-1 as shows in Figure 3(b), the motion vector (dm, dn) represents the displacement
which allows minimizing E3.
So each inter slice is replaced by one motion field (forward) and/or etiquette (to indicate which
prediction error is used) and residual slice.
Figure 4. 3 levels motion compensated truncated 5/3 lifting filter for GOS with 16 slices

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Figure 4 presents 3 decomposition levels of MC Trunc 5/3 for GOS with 16 slices; the number of
obtained slices of MC Trunc 5/3 is the same to our scheme which is composed by 2 reference slices (1, 9) and
14 residual slices (R1, R2, … R14), the slice (17) represents the first reference slice in the next GOS.
However for motion coding, the approach with MC Trunc 5/3 produces two motion fields and our
approach one motion field (forward) and etiquette for each predicted block by E3 and only etiquette for each
predicted block by E1 or E2.
3.3. Reference and residual slices, motion vectors and etiquettes coding
The obtained reference and residual slices composed GOS are coded by 3D SPIHT [13] (Set
Partitioning in Hierarchical Trees) and generated bit stream is coded by arithmetic coder, 3D SPIHT is used as
in video coding and volumetric image coding, it is a bit plan coder and it permits to reduce data size by
exploiting the inter dependences of subbands in three dimensions 𝑥, 𝑦 and inter slices. Concerning the motion
vectors and etiquettes are coded by arithmetic coder.
4. EXPERIMENTAL RESULTS
We tested the proposed compression method with five native 4D medical images CT (Computed
Tomography) of heart from two references [14][15] shown in Figure 5. Each one is composed by 10 volumes
and the spatial resolution of slices is 512×512 coded on 16bits per pixel. However the volumes of each 4D
medical image have different sizes: data of reference [14] Image1 (141 slices/volume), Image2 (169
slices/volume) and Image3 (170 slices/volume) data of reference [15] Image4 (136 slices/volume) and Image5
(120 slices/volume).
Figure 5. First slices of each 4D medical image
We compare the experimental results of our approach with MC Trunc 5/3 approach (3D SPIHT with
MC Trunc 5/3) and 3D SPIHT without motion compensation. For all these approaches GOS are composed by
16 slices formed as shows in Figure 2 (b).

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After each GOS is transformed with 3 levels 2D integer wavelet transform in spatial directions (𝑥, 𝑦)
we use 5/3 filter. In inter slices direction of GOS our approach uses the proposed filter equations (2, 3 and 4),
the MC Trunc 5/3 approach uses equation (1) with also three levels of decomposition for both. However 3D
SPIHT without motion compensation uses in inter slices direction 1D integer wavelet transform with three
levels of decomposition of the same used filter in spatial directions (5/3). The obtained subbands of three
approaches are coded with 3D SPIHT.
The lifting scheme is very applied in medical image compression with traditionnel filters as 5/3 but
other new filters can be tested in spatial directions [16]. The motion vectors are determined by block motion
compensation model with full search method, the search is effectuated with block size of 16×16 pixels in our
approach and MC Trunc 5/3 approach. The Table 1 lists the obtained average bit rate for the lossless
compression using two first volumes of each 4D medical image.
Table 1. 4D Lossless Compression Results in bit per pixel (bpp)
4D Medical Images 3D SPIHT MC Trunc 5/3 Proposed Method
Image1 5.19 5.23 5.10
Image2 5.92 5.97 5.89
Image3 5.39 5.45 5.36
Image4 5.03 5.06 4.98
Image5 4.53 4.55 4.35
The results show our method outperforms the other methods for all test images. 3D SPIHT gives low
average bit rate than MC Trunc 5/3 of 0.76% , thus the integration of the motion compensated truncated 5/3
lifting filter in 3D SPIHT penalises the compression rate in MC Trunc 5/3 approach. However the proposed
inter slices filter improves the compression rate (low bit rate) with average of 1.45% compared to 3D SPIHT,
as well a net improvement is reached of the order of 2.2% compared to MC Trunc 5/3.
The average improvement by proposed technique compared to 3D SPIHT is obtained by using image1
thus we use it in following test. The experimental results presented in Table 2 are obtained by testing five
different sizes of image1, thus line 2 represents lossless compression results of 2 first volumes of image1, line
3 of 4 first volumes of Image1 and so on to the last line of 10 first volumes of image1, these different sizes of
Image1 permit to obtain differents GOS by reorganizing the slices as in Figure 2 (b).
Table 2. 4D Lossless Compression Results in bit per pixel (bpp) for different sizes of Image1
4D Medical Images 3D SPIHT MC Trunc 5/3 Proposed Method
2Volumes Image1 5.19 5.23 5.10
10Volumes Image1 4.99 4.96 4.90
The obtained compression rate by proposed method is better than other schemes for all images test. We
note that the bit rate is reduced for all compression schemes while the number of temporal slices (at different
time and with the same position 𝑧) composed GOS increase. The results show a variation of the compression
rate as a function of the number of volumes. The improvement of this rate by our approach is of the order of
1.73% and 1.85% compared to 3D SPIHT and MC Trunc 5/3 respectively, while it does not exceed 0.11%
between the latter two methods.
5. CONCLUSION
In this paper we proposed a new approach of lossless compression of 4D medical images, it consists
in construction of GOS and each slices composed GOS is decorrelated in spatial directions (𝑥,𝑦), after proposed
inter slices filtering is performed with minimum of three predicted errors for each block composed inter slices.
The three prediction errors are represented by unfiltered block, truncated 5/3 lifting filter and motion
compensated the aim is to reduce the size of residual slices. The obtained slices are coded with 3D SPIHT. The
proposed approach provides lossless compression improvements by reducing the bit rates compared to 3D
SPIHT with MC trunc 5/3 and 3D SPIHT without motion compensation, this enhancement is due to the
integration of the three prediction techniques in inter slices filter. As future work, our approach offers the
possibility to obtain lossy to lossless decoding by exploiting inter slices scalability also other 4D medical image
modalities can be tested.

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