共查询到19条相似文献,搜索用时 125 毫秒
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本文采用图像平滑、边缘跟踪、霍夫变换、逆霍夫变换等综合图像处理的技术,从卫星TM图像中提取线性体信息。在霍夫变换后的累加器阵列中采用局部最大值选择,逆霍夫变换后采用剖面分析等人-机交互处理方法,结合遥感地质学家的图像解泽经验,从而提高了线性体信息自动提取的精度。 相似文献
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随着遥感技术在地质上的应用不断深入,单一波段图像或常规的合成图像已不能满足地质解译的需要,作者通过对TM数据进行多种功能复合处理,期望能直接从影像上获得蚀变信息和线性体(构造)发育程度的信息。 蚀变信息的提取根据白云母化、绢云母化和绿泥石化等蚀变岩石波谱曲线和正常岩石波谱曲线的差异,通过TM 5/TM7的比值提高蚀变岩石的灰度。由于南方植被发育,这一比值也使植被信息得到提高,而TM 4/TM3是植被的指示系数,因此利用这两个比值进行变换分类,就可消除植被对蚀变信息的干扰。 线性体提取及其密度统计线性体与断裂构造是密切相关… 相似文献
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针对现有的基于图像处理的棒材计数方法不准确且不能适应不同直径和不同切断工艺的问题,提出一种利用迭代霍夫圆变换和多阈值连通区域面积法统计实现成捆棒材的可靠计数。该方法先提取成捆棒材在图像中的位置即感兴趣区域(ROI)并规格化,再对规格化后的ROI进行迭代霍夫圆变换提取棒材进行计数,最后进行多阈值连通区域面积法统计遗漏棒材,并与迭代霍夫圆变换计数结果求和得到最终计数结果。实验表明,该方法计数准确率高,能适应不同棒材直径和不同的切断工艺。 相似文献
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视频数据的地理信息提取最大问题在于动态视频图像精度的精准捕捉以及实时存储处理,针对该问题,提出一种以运动向量为基底的影像式背景模型建立架构,提供外型准确完整的移动物体图像捕捉数据,同时结合动态视频捕捉的图像,采用霍夫变换、直线拟合与线段分割等步骤提取目标物的边界线段,从而获得目标物的地理信息,通过验证视频图像地理信息提取结果,可以发现本文视频动态图像地理信息数据提取技术具有较高的准确性和可靠性。 相似文献
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Line-based modified iterated Hough transform for automatic registration of multi-source imagery 总被引:1,自引:0,他引:1
Image registration aims at combining imagery from multiple sensors to achieve higher accuracy and derive more information than that obtained from a single sensor. The enormous increase in the volume of remotely sensed data that is being acquired by an ever-growing number of earth observation satellites mandates the development of accurate, robust, and automated registration procedures. An effective automatic image registration has to deal with four issues: registration primitives, transformation function, similarity measure, and matching strategy. This paper introduces a new approach for automatic image registration using linear features as the registration primitives. Linear features have been chosen because they can be reliably extracted from imagery with significantly different geometric and radiometric properties. The modified iterated Hough transform (MIHT), which manipulates the registration primitives and similarity measure, is used as the matching strategy for automatically deriving an estimate of the parameters involved in the transformation function as well as the correspondence between conjugate primitives. The MIHT procedure follows an optimal sequence for parameter estimation that takes into account the contribution of linear features with different orientations at various locations within the imagery towards the estimation of the transformation parameters in question. Experimental results using real data proved the feasibility and robustness of the suggested approach. 相似文献
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Venkatesh Raghavan P. V. Panchanathan 《Journal of the Indian Society of Remote Sensing》1989,17(4):31-38
Fortran 77 programs have been developed for summarisation of lineament pattern and fracture traces on MS-DOS based micro-computer system. Two menu driven programmes CLAFY and HIST perform the above task. CLAFY reads the X, Y co-ordinates of lineament and points from an input file and produces an output file containing azimuth frequency, total length and average length for 18 predefined azimuth classes at 10 degree interval. HIST reads the output generated by CLAFY and offers an option to generate histograms of azimuth frequency/total length/average length on a dot matric printer. CLAFY and HIST were tested using digitised lineament co-ordinates derived from lineament maps of parts of Central Kerala region, southwestern, India which were prepared based on Landsat imagery interpretation. The programmes afford repetitive manipulation of large quantities of lineament data without ignoring short and /or faint lineaments which have geologic significance. 相似文献
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The study area comprises Bundelkhand Granite of Archaean age in the east, unconformably overlain by Upper Vindhyan sequence, ranging from Upper Kaimur Sandstone to Lower Bhander Sandstone Groups, in the west. Geomorphologically, the area has been divided into three geomorphic provinces viz. (1) Bundelkhand inselberg — pediplain, (2) Vindhyan structural plateau, consisting of two major sub-levels of Upper and Lower Bhander Sandstone Groups and two minor sub-levels of Upper and Lower Rewa Sandstone Groups, separated by escarpment and/or valleys, and (3) Chambal alluvial plain. Photo-interpretation and field studies indicate that there are three sets of lineament trends in the area out of which the NNW-SSE trend comes out very strongly on imagery and is correlatable with basement fracture trend of Bundelkhand massif. The synoptic view through imagery also gives the impression that the course of Chambal river towards north and west is controlled by a major lineament, possibly a regional fault trending NE-SW. The NNW-SSE lineament trend mentioned above then probably reflects tension release aspect of the faulting. The field check has brought out some very broad, gentle warps also with NNE-SSW trend in the area. The paper presents the salient observations on geological, structural and geomorphological studies for Shivpuri area based on remote-sensing techniques and their utility for such regional investigations. 相似文献
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S. K. Nag 《Journal of the Indian Society of Remote Sensing》2005,33(4):521-529
Groundwater being a valuable resource in today’s world needs proper evaluation and management for overall development within
the region for its judicious use. The Baghmundi Block of Purulia district, West Bengal is within the hard rock terrain of
Ayodhya hills and Matha Protected forest. The groundwater in this region is confined within the fracture zones and weathered
residuum. Hydrogeomorphologically, the entire area is classified into following categories such as - i) Very shallow weathered
pediment, ii) Moderately weathered pediment, iii) Valley fills, iv) Erosional gullies, v) Lateritic Upland and vi) Accumulation
gullies.
The hydrogeomorphic map of the area prepared by Department of Science and Technology, Govt. of West Bengal has been digitized
for the present study. The lineament map has been prepared from the satellite imagery. The lineament map has also been digitized
for the present study. From this the lineament density contour map has been prepared. An integrated remote sensing and Geographic
Information System (GIS) based methodology has been used for the delineating Groundwater potential zones in the study area.
Here the Geomorphology and Lineament density maps are overlaid following the Weighted Index Overlay Method, which delineates
groundwater potential zones. 相似文献
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G. S. Srivastava R. B. Sharan R. P. Sharma 《Journal of the Indian Society of Remote Sensing》1977,5(2):47-55
The authors interpreted a major lineament in Ladakh region on LANDSAT imagery and named it Nubra-Gartang superlineament, after the two livers along which it is aligned for a considerable distance. The superlineament trending NW-SE, extends for a distance of 750 km from the Afganistan border to southern Tibet. Structural and geomorphic evidences indicate that the lineament is perhaps still active and represents a dextral strike-slip fault. The fracture pattern and other tectonic elements suggest that a ‘suture’ zone is expected further to the north of this line in the Pamir region and the so called ‘Indus suture zone’ may be only a sister fracture to this superlineament. Occurrences of Quaternary volcanics along the superlineament are not ruled out and as such the zone offers a favourable locale for associated mineralisation. 相似文献
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The Precambrian metamorphites of Northeastern Rajasthan belonging to Pre-Aravalli, Aravalli and Delhi Supergroups exhibit a mature topography where the physiography has faithfully depicted the major structures of area. Few important megalineaments demarcated on the imagery either represent major fault zones or the zones of intense granitic activity. Some of these are oblique to the regional strike of rocks and support drainage running in diagonally opposite direction within the same lineament, indicating thereby upheavels subsequent to the lineament formation. The lineaments fall broadly in two sets which are correlatable to the two major phases of Delhi orogeny. The lineaments of the first set trend NE-SW and are more prominent: than the NW-SE and WNW-ESE running lineaments. The major lineaments such as Sabi-Sota, Mendha and Kakor-Lalsot lineament together with other regional lineaments depict appreciable geomorphological expressions and significant geological evidences. 相似文献
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Lineaments of Panchpatmali plateau and the adjoining areas in Koraput District, Orissa, lying on the East Coast of India, were analysed to elucidate their influence on the occurrence of’ laterite/bauxite duricrust of the area. A detailed lineament map and a map of the explored and expected deposits of laterite and bauxite of the areas have been prepared from satellite imagery after ‘Band Ratioing’ and ‘Maximum Likelihood Classification’ and ground truth study. Development of laterite/bauxite plateaus follows the regional lineament trend of NE - SW, probably due to the tectonic activities in the area. It has been observed that there are atleast two major planation surfaces - the older one shows complete development of laterite/bauxite duricrust, whereas the younger planation surfaces are devoid of any. 相似文献
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Pramod Kumar Singh Sanjay Das S. R. Mohapatra 《Journal of the Indian Society of Remote Sensing》2012,40(1):85-96
The 2001 Bhuj earthquake (Mw 7.7), one of the most severe earthquakes in the recent history of India, reactivated various existing active faults. It is
manifested in the form of coseismic ground fissures/cracks and upheaval of land in the form of bumps. Identification and reactivation
of Loriya Fault is established by 1—Geomorphic changes with the help of digital imagery (LISS III images). 2—Coseismic changes
through ground checks and 3—Geophysical signatures through magnetic and gravity survey. A lineament cutting the north-western
part of the Pur River alluvial fan has been revealed by satellite imagery. The streams flowing along the lineament add to
the evidences of a weak plane, while the occurrence of coseismic ground fissures confirms the existence of an active fault.
No dip slip movement is recorded in the trenches made across the Loriya active fault while the en-echelon pattern of ground
fissures suggest strike slip movement along the fault due to 2001 earthquake. 相似文献