Studies reported in [9], [10] have tried to employ the MRF
model for image change detection (ICD). In [9], one image is
subtracted from the other, pixel by pixel, and two thresholds
(one low and one high) are then selected. If the difference
intensity level of a pixel is lower than the low threshold, then
this pixel is put in the absolute unchanged class. If the intensity
level is greater than the high threshold, the corresponding pixel
is put in the absolute changed class. The remaining pixels whose
difference intensity levels are between these two thresholds are
subjected to further processing where the spatial-contextual
information based on the MRF model is considered. A similar
approach can be found in [10]. Again, this algorithm can be
divided into two parts. In the first part, a pixel-based algorithm
[1] determines an initial change image (CI) that is further refined
based on the MRF model in the second part. Some information
is lost while obtaining the initial CI, since the observed data are
projected into a binary image whose intensity levels represent
change or no change. We observe that studies in [9] and [10]
do not fully utilize all the information contained in images;
moreover, the preservation of MRF properties is not guaranteed.
In [11], the effect of image transformations on images that
can be modeled by MRFs is studied. It has been shown that
MRF properties may not hold after many transformations such
as resizing of an image and subtraction of one image from
another. For some specific transformations, MRF properties
are preserved, but a new set of potential functions must be
obtained. Since a difference image can be looked upon as a
transformation, MRF modeling of a difference image in [9]
and initial CI in [10] may not be valid. This provides the
motivation for the development of an ICD algorithm that uses
additional information available from the image and preserves MRF properties. Here, we develop an ICD algorithm that
consists of only one part. The observed images modeled as
MRFs are directly processed by the maximum a posteriori
(MAP) detector, which searches for the global optimum.
Studies reported in [9], [10] have tried to employ the MRFmodel for image change detection (ICD). In [9], one image issubtracted from the other, pixel by pixel, and two thresholds(one low and one high) are then selected. If the differenceintensity level of a pixel is lower than the low threshold, thenthis pixel is put in the absolute unchanged class. If the intensitylevel is greater than the high threshold, the corresponding pixelis put in the absolute changed class. The remaining pixels whosedifference intensity levels are between these two thresholds aresubjected to further processing where the spatial-contextualinformation based on the MRF model is considered. A similarapproach can be found in [10]. Again, this algorithm can bedivided into two parts. In the first part, a pixel-based algorithm[1] determines an initial change image (CI) that is further refinedbased on the MRF model in the second part. Some informationis lost while obtaining the initial CI, since the observed data areprojected into a binary image whose intensity levels representchange or no change. We observe that studies in [9] and [10]do not fully utilize all the information contained in images;moreover, the preservation of MRF properties is not guaranteed.In [11], the effect of image transformations on images thatcan be modeled by MRFs is studied. It has been shown thatMRF properties may not hold after many transformations suchเป็นการปรับขนาดของภาพและลบภาพหนึ่งจากการอื่น สำหรับแปลงเฉพาะบาง คุณสมบัติ MRFมีเก็บ แต่ชุดใหม่อาจต้องเป็นฟังก์ชันรับ เนื่องจากรูปความแตกต่างที่สามารถจะมองเป็นการการเปลี่ยนแปลง MRF โมเดลของความแตกต่างของภาพใน [9]และ CI ใน [10] เริ่มต้นอาจไม่ถูกต้อง ให้การแรงจูงใจสำหรับการพัฒนาอัลกอริทึมการ ICD ที่ใช้ข้อมูลเพิ่มเติมจากคุณสมบัติ MRF รูปและกวน ที่นี่ เราพัฒนาอัลกอริทึมการ ICD ที่ประกอบด้วยส่วนหนึ่งเท่านั้น สังเกตภาพจำลองเป็นโดยตรงในการประมวลผล MRFs โดย posteriori เป็นสูงสุดจับ (แผนที่) ซึ่งมีประสิทธิภาพสูงสุดทั่วโลกค้นหา
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