scholarly journals CALIBRATION OF NON-METRIC UAV CAMERA USING DIFFERENT TEST FIELDS

2021 ◽  
Vol 47 (3) ◽  
pp. 111-117
Author(s):  
Szymon Sobura
Keyword(s):  
Digital Camera ◽  
Research Area ◽  
Test Area ◽  
Test Field ◽  
Control Measurement ◽  
Object Distance ◽  
Camera Orientation ◽  
Spatial Test ◽  
Orientation Parameters

The paper deals with the calibration of a non-metric digital camera Nikon EOS 6D with a 50 mm lens that could be adapted as a potential UAV sensor for the purposes of aerial inspections. The determination of the internal orientation parameters and the image errors of the non-metric digital camera involved self-calibration with Agisoft Metashape software solving the network of the images obtained from different test fields: a chessboard field, a professional laboratory field and a spatially diverse research area. The results of the control measurement for the examined object distance of 6 meters do not differ significantly. The RMSE from the control measurement for the second analyzed object distance of 15 meters was calculated on the basis of the internal orientation elements. The images from the laboratory field, the spatial test area and the chessboard field were used, and the obtained results amounted to 7.9, 9.9 and 11.5 mm, respectively. The conducted studies showed that in the case of very precise photogrammetric measurements performed by means of the Nikon EOS 6D camera equipped with a 50 mm lens, it is optimal to conduct calibration in a laboratory test field. The greatest RMSE errors were recorded for the control images with the elements of the internal camera orientation calculated on the basis of the chessboard area. The results of the experiments clearly show a relation between the accuracy of the Nikon EOS 6D camera calibrations and the percentage of the frame area filled with the test field. This explains why the weakest calibration results were obtained from the chessboard test field.

scholarly journals PERFORMANCE EVALUATION OF NON-METRIC DIGITAL CAMERA FOR PHOTOGRAMMETRIC APPLICATION

2012 ◽  
Vol 31 (1) ◽  
pp. 23-27 ◽  
Author(s):  
Birutė Ruzgienė
Keyword(s):  
Field Experiments ◽  
Low Cost ◽  
Digital Camera ◽  
Ccd Camera ◽  
Test Field ◽  
Digital Cameras ◽  
Close Range ◽  
Orientation Parameters ◽  
Poor Stability

During the last year amateur low‐cost digital cameras are increasingly expected to contribute to the digital photogrammetry. An important aspect of the suitability of these cameras is determination of their geometrical instability. In order to evaluate amateur digital camera performance, small format, low resolution and low-cost CCD camera have been investigated in two considerations: determining inner orientation parameters at different time and estimating accuracy in test field experiments. The calibration results demonstrate the poor stability of such a digital camera. As a result of the instability, amateur cameras have limited possibilities in close-range photogrammetry. However, the investigated camera under certain limited accuracy requirements can be used for low-accuracy photogrammetric application.

scholarly journals METHODOLOGY FOR AUTOMATIC DETERMINATION OF CONTRAST OF LASER MARKING FOR DIFFERENT MATERIALS

2019 ◽  
Vol 3 ◽  
pp. 134
Author(s):  
Lyubomir Lazov ◽  
Edmunds Teirumnieks ◽  
Nikolay Angelov ◽  
Erika Teirumnieka
Keyword(s):  
Laser System ◽  
Digital Camera ◽  
Test Field ◽  
Automatic Determination ◽  
Technological Parameters ◽  
Test Analysis ◽  
Laser Marking ◽  
Different Types

A new methodology for determining and optimizing the contrast of the technological laser marking process has been developed. It can evaluate the quality of the markings regardless of the type of material and the type of laser system. To perform the test analysis, a specialized test field is programmed, which including the change of two of the main parameters influencing the marking process: the linear energy density (LED) and the linear density of the pulses (LDI). Marking of a test field consisting of squares of a certain size is done by means of a raster marking method with a constant step between the lines. The results are processed with a digital camera and specialized software. The maximum blackening is compared with the background of all fields and is juxtaposed with the effective energy needed to obtain a certain contrast. Several consecutive iterations are made, with each of the following experiments excluding the variants with least contrast. Thus, the study consistently brings the result to a minimum working area of the basic technological parameters, providing the user's desired contrast of the marking. The developed author's method of automatically determining the contrast of the laser marking reduces the time for preliminary experimental research and gives a reliable and subjectively absent way of qualitatively marking different types of industrial products.

scholarly journals Determination of the Interior Orientation Parameters of a Non-metric Digital Camera for Terrestrial Photogrammetric Applications

2019 ◽  
Vol 19 (2) ◽  
pp. 1-9
Author(s):  
Naa Dedei Tagoe ◽  
S. Mantey
Keyword(s):  
Digital Camera ◽  
Calibration Procedure ◽  
Bundle Adjustment ◽  
Digital Cameras ◽  
Close Range ◽  
Camera Parameters ◽  
The Stability ◽  
Mean Square Errors ◽  
Orientation Parameters

AbstractHigh cost of metric photogrammetric cameras has given rise to the utilisation of non-metric digital cameras to generate photogrammetric products in traditional close range or terrestrial photogrammetric applications. For precision photogrammetric applications, the internal metric characteristics of the camera, customarily known as the Interior Orientation Parameters, need to be determined and analysed. The derivation of these parameters is usually achieved by implementing a bundle adjustment with self-calibration procedure. The stability of the Interior Orientation Parameters is an issue in terms of accuracy in digital cameras since they are not built with photogrammetric applications in mind. This study utilised two photogrammetric software (i.e. Photo Modeler and Australis) to calibrate a non-metric digital camera to determine its Interior Orientation Parameters. The camera parameters were obtained using the two software and the Root Mean Square Errors (RMSE) calculated. It was observed that Australis gave a RMSE of 0.2435 and Photo Modeler gave 0.2335, implying that, the calibrated non-metric digital camera is suitable for high precision terrestrial photogrammetric projects. Keywords: Camera Calibration, Interior Orientation Parameters, Non-Metric Digital Camera

scholarly journals The Use of Video-Tacheometric Technology for Documenting and Analysing Geometric Features of Objects

2015 ◽  
Vol 99 (1) ◽  
pp. 28-43 ◽  
Author(s):  
Marek Woźniak ◽  
Ewa Świerczyńska ◽  
Sławomir Jastrzębski
Keyword(s):  
Point Cloud ◽  
Digital Camera ◽  
Field Work ◽  
Geometric Features ◽  
Scanning Process ◽  
Geometrical Features ◽  
Multiple Determination ◽  
Distortion Parameters ◽  
Orientation Parameters

Abstract This paper analyzes selected aspects of the use of video-tacheometric technology for inventorying and documenting geometric features of objects. Data was collected with the use of the video-tacheometer Topcon Image Station IS-3 and the professional camera Canon EOS 5D Mark II. During the field work and the development of data the following experiments have been performed: multiple determination of the camera interior orientation parameters and distortion parameters of five lenses with different focal lengths, reflectorless measurements of profiles for the elevation and inventory of decorative surface wall of the building of Warsaw Ballet School. During the research the process of acquiring and integrating video-tacheometric data was analysed as well as the process of combining “point cloud” acquired by using video-tacheometer in the scanning process with independent photographs taken by a digital camera. On the basis of tests performed, utility of the use of video-tacheometric technology in geodetic surveys of geometrical features of buildings has been established.

Optimal Density Determination of Bouguer Anomaly Using Fractal Analysis (Case of study: Charak area,IRAN)

2005 ◽  
Vol 1 (1) ◽  
pp. 21-24
Author(s):  
Hamid Reza Samadi
Keyword(s):  
Surface Roughness ◽  
Fractal Dimension ◽  
Fractal Analysis ◽  
Fractal Geometry ◽  
Host Rock ◽  
Bouguer Anomaly ◽  
Research Area ◽  
Density Difference ◽  
Optimal Density

In exploration geophysics the main and initial aim is to determine density of under-research goals which have certain density difference with the host rock. Therefore, we state a method in this paper to determine the density of bouguer plate, the so-called variogram method based on fractal geometry. This method is based on minimizing surface roughness of bouguer anomaly. The fractal dimension of surface has been used as surface roughness of bouguer anomaly. Using this method, the optimal density of Charak area insouth of Hormozgan province can be determined which is 2/7 g/cfor the under-research area. This determined density has been used to correct and investigate its results about the isostasy of the studied area and results well-coincided with the geology of the area and dug exploratory holes in the text area

Estimation of bodyweight from body measurements and determination of body measurements on Limousin cattle using digital image analysis

2016 ◽  
Vol 56 (12) ◽  
pp. 2060 ◽  
Author(s):  
Serkan Ozkaya ◽  
Wojciech Neja ◽  
Sylwia Krezel-Czopek ◽  
Adam Oler
Keyword(s):  
Image Analysis ◽  
Body Length ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Digital Camera ◽  
Body Measurements ◽  
Analysis Software ◽  
Body Area ◽  
Image Analysis Software

The objective of this study was to predict bodyweight and estimate body measurements of Limousin cattle using digital image analysis (DIA). Body measurements including body length, wither height, chest depth, and hip height of cattle were determined both manually (by measurements stick) and by using DIA. Body area was determined by using DIA. The images of Limousin cattle were taken while cattle were standing in a squeeze chute by a digital camera and analysed by image analysis software to obtain body measurements of each animal. While comparing the actual and predicted body measurements, the accuracy was determined as 98% for wither height, 97% for hip height, 94% for chest depth and 90.6% for body length. Regression analysis between body area and bodyweight yielded an equation with R2 of 61.5%. The regression equation, which included all body traits, resulted in an R2 value of 88.7%. The results indicated that DIA can be used for accurate prediction of body measurements and bodyweight of Limousin cattle.

scholarly journals DAMPAK PENGGUNAAN KERAMBA JARING APUNG PADA PEMBUDIDAYA IKAN KERAPU BERDASARKAN PERSPEKTIF SOSIAL EKONOMI

Jurnal KIRANA ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 12
Author(s):  
Lenny Widjayanthi ◽  
Yeni Anggun Widayanti
Keyword(s):  
High Risk ◽  
Social Impact ◽  
Economic Impacts ◽  
Research Area ◽  
Selling Price ◽  
Analysis Method ◽  
Depth Interview ◽  
The Social ◽  
Net Cages

Grouper fish is a type of reef fish that is exported as a commodity to various countries such as Hong Kong, Japan, Singapore and China. Grouper fish can be cultivated using floating net cages and have a high selling price (high profit) but also have a high risk (high risk), thus affecting the market and the number of grouper aquaculture. The purpose of this research is to determine the socioeconomic impact of the use of floating net on grouper farmers. The determination of the research area was carried out deliberately in Situbondo Regency. The study was conducted with a qualitative approach. Data collection is done by observation and depth interview. The informants of the research were determined intentionally, namely grouper fish farmers who do aquaculture with floating net cages. The data analysis method uses Milles and Huberman. The results showed that the use of floating nets for grouper culture had social and economic impacts. The social impact on grouper farmers is the formation of grouper farmers, thus creating a social network in the form of interaction between farmers; construction of supporting facilities for the development of aquaculture businesses but also raises social prejudices between farmers because of frequent theft of fish in floating nets. While the economic impact is based on increasing grouper production which has a direct impact on the income of grouper farmers. Keywords : Floating net, grouper fish farmers, socio-economic impacts

scholarly journals SCDMImage: um aplicativo para detecção de características morfológicas em produtos agrícolas

2021 ◽  
Vol 1 (53) ◽  
pp. 27
Author(s):  
Valnyr Vasconcelos Lira ◽  
Francisco Fechine Borges ◽  
Jéssica Cordeiro da Silva Santos ◽  
Antônio Pedro Gomes Tabosa ◽  
Mário Eduardo Rangel Moreira Cavalcanti Mata
Keyword(s):  
Fruits And Vegetables ◽  
Mangifera Indica ◽  
Digital Camera ◽  
Morphological Characteristics ◽  
Reliable Estimate ◽  
Continuous Growth ◽  
The Masses ◽  
Cultivation Techniques

<p><span class="fontstyle0">With the evolution of cultivation techniques, the world production of fruits and vegetables has been presenting a continuous growth. Despite the increase in production, a significant portion of the harvested products is mainly lost in the post-harvest due to several factors, such as inapropriate handling, transportation and conservation, lack of selection and classification, poorly sized packaging, among others. In general, the quality of fruits and vegetables is usually evaluated by the following parameters: size, shape, mass, color, firmness, ripeness, absence of bruises and pathologies.The objective of this work was to develop an application in Matlab to detect morphological characteristics (width, length, area, perimeter) of Mangifera indica L., ‘Tommy Atkins’ mangos from images, and using the same images, estimate its weigth. The images of the mangoes were acquired with a digital camera attached to an illuminated box and later processed in an application developed in Matlab. The images showed the morphological characteristics of the samples were obtained and an equation was determined to estimate their mass. The determination of the mass from the images had a 96% correlation with the actual mass measured with a scale and it was possible to obtain a reliable estimate of the masses of the mangoes from their images.</span></p>

scholarly journals Digital processing of leaf area of soybeans, subjected to different treatments of seeds

2020 ◽  
Vol 13 (3) ◽  
pp. 24
Author(s):  
M. L. V. Passos ◽  
J. B. C. Souza ◽  
E. A. Silva ◽  
C. A. A. C. Silva ◽  
W. S. Sousa ◽  
...  
Keyword(s):  
Image Processing ◽  
Computer Program ◽  
Leaf Area ◽  
Seed Treatment ◽  
Digital Camera ◽  
Digital Processing ◽  
Thiophanate Methyl ◽  
Beneficial Effects ◽  
Non Destructive

Digital image processing, when applied to the study of leaf area, allows the integration of the direct measurement and non-destructive, and thus preserves the integrity of the plant. The objective was the quantification of the leaf area of soybean, cv. FTS Paragominas RR, submitted to different treatments of seed with the use of the computer program ImageJ, and basic presuppositions of image processing. The experiment was conducted at the Center of Agrarian Sciences and Environmental, Federal University of Maranhão, in Chapadinha (MA), in the period from February to June 2018. The seeds of soybean 'Paragominas RR' were submitted to the technique of seed treatment, consisting of three fungicides of the active ingredients, thiophanate methyl + fluazinam, fludioxonil and carbendazim + tiram, an insecticide active ingredient fipronil and the control. The leaf area was analyzed in the growth phase, through the use of digital camera and ImageJ®. The use of the routines in the computer program ImageJ® were effective for the determination of leaf area of the soybean submitted to different treatments of the seed. The thiophanate methyl + fluazinam in the dose 200 mL per 100 kg of seeds showed beneficial effects on growth of the cv. FTS Paragominas RR, as estimated by the leaf area.

Salt-affected land in the shire of Wongan-Ballidu, Western Australia

Soil Research ◽  
1981 ◽  
Vol 19 (1) ◽  
pp. 87 ◽  
Author(s):  
RA Nulsen
Keyword(s):  
Survey Methods ◽  
Accurate Determination ◽  
Test Area ◽  
Affected Area ◽  
The Road ◽  
Farm Survey ◽  
The Mean ◽  
Secondary Salinity ◽  
On Farm

A survey was conducted to measure the total area of salt affected land in the Wongan-Ballidu Shire. Initially two survey methods were used: an intense on-farm survey and a broadscale road traverse survey. In the test area there was no net difference in areas of salt land detected by the two survey methods. and the remainder of the shire was surveyed by the road traverse method. Difficulties in objective delineation of areas of primary and secondary salinity precluded accurate determination of each, and only the total salt-affected area could be measured. The total area was 51,975 ha. representing 15.4% of the shire area. Detailed surveys of three 2080 ha sites in the shire showed that in the 18 years between 1958 and 1976 the area of salt land increased by up to 237% with the mean area within sites increasing from 206 ha in 1958 to 541 ha in 1976.

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