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9 results for “Compact Camera”
Maize Phosphorus Leaf Deficiency (MPLD) Database | Compact Scientific Camera (original-processed)
<p>This database presents samples of maize leaves placed on a withe background, representing three levels of phosphorus deficiency: complete absence of the nutrient (labeled -P), half dose of the required phosphorus for normal plant development (-P50), and complete supply (C).</p><p>Its composed of two folders:</p><ul><li>Original_dataset: 722 jpg images of 1280 x 1020 pixels size divided into '_C', '-P' and '-P50' folders for class labels.</li><li>Processed_dataset: 2433 png images of 224 x 224 pixels size divided into '-C', '-P' and '-P50' folders for class labels.</li></ul>
Assessment of the Axial Resolution of a Compact Gamma Camera With Coded Aperture Collimator
<p>The dataset contains 21 images of a point-like gamma source, taken with a compact gamma camera that was equipped with a coded aperture collimator. The pixel intensity represents the accumulated energy deposited by the captured gamma photons. This dataset was acquired as part of the following paper, to which the reader is referred for an in-depth explanation.</p> <p>Note: Although the TIFF files may appear as all black or all transparent images, they will be displayed correctly when opened with an image processing tool such as ImageJ or a Python script.</p> <p><strong>Assessment of the Axial Resolution of a Compact Gamma Camera With Coded Aperture Collimator<br></strong></p> <p><strong>Purpose:</strong> Handheld gamma cameras with coded aperture collimators are under investigation for intraoperative imaging in nuclear medicine. Coded apertures are a promising collimation technique for applications such as lymph node localization due to their high sensitivity and the possibility of 3D imaging. We evaluated the axial resolution and computational performance of two reconstruction methods.<br><strong>Methods:</strong> An experimental gamma camera was set up consisting of the pixelated semiconductor detector Timepix3 and MURA mask of rank 31 with round holes of 0.08mm in diameter in a 0.11mm thick Tungsten sheet. A set of measurements was taken where a point-like gamma source was placed centrally at 21 different positions within the range of 12 to 100mm. For each source position, the detector image was reconstructed in 0.5mm steps around the true source position, resulting in an image stack. The axial resolution was assessed by the full width at half maximum (FWHM) of the contrast-to-noise ratio (CNR) profile along the z-axis of the stack. <br>Two reconstruction methods were compared: MURA Decoding and a 3D maximum likelihood expectation maximization algorithm (3D-MLEM). <br><strong>Results: </strong>While taking 4,400 times longer in computation, 3D-MLEM yielded a smaller axial FWHM and a higher CNR. The axial resolution degraded from 5.3mm and 1.8mm at 12mm to 42.2mm and 13.5mm at 100mm for MURA Decoding and 3D-MLEM respectively. <br><strong>Conclusion:</strong> Our results show that the coded aperture enables the depth estimation of single point-like sources in the near field. Here, 3D-MLEM offered a better axial resolution but was computationally much slower than MURA Decoding, whose reconstruction time is compatible with real-time imaging.</p>
Supplementary material 2 from: Mertens JEJ, Van Roie M, Merckx J, Dekoninck W (2017) The use of low cost compact cameras with focus stacking functionality in entomological digitization projects. ZooKeys 712: 141-154. https://doi.org/10.3897/zookeys.712.20505
Figure S2 : Explanation note: Comparison of the narrow (C, F), normal (A, B, D, G) and wide (E, H) focal step size in two specimens of different 'depth' (A, C–E: Allochroma sp., 2 mm deep; B, E–H: Doryphora sp., 12 mm deep, measured from top of elytra to lowest tarsi). The narrow setting is marginally sharper in some areas; however, deeper parts of the specimen are not in focus. The wide setting produces artefacts around some of the edges, sometimes resulting in less sharp regions.
Supplementary material 1 from: Mertens JEJ, Van Roie M, Merckx J, Dekoninck W (2017) The use of low cost compact cameras with focus stacking functionality in entomological digitization projects. ZooKeys 712: 141-154. https://doi.org/10.3897/zookeys.712.20505
Figure S1 : Explanation note: Lightbox setup, the camera rests on top of the cut-off bucket, its lens protruding though the hole in the middle. The specimen is usually shielded from direct light by a free-standing cylinder of tracing paper (not depicted). The LED strips on the inside are powered through a 12V adapter.
Figure 3 from: Mertens JEJ, Van Roie M, Merckx J, Dekoninck W (2017) The use of low cost compact cameras with focus stacking functionality in entomological digitization projects. ZooKeys 712: 141-154. https://doi.org/10.3897/zookeys.712.20505
Figure 3 - Comparison of image quality between the compact camera (A) and the professional setup (B) with the specimen occupying the same proportion of the frame. A detail is shown below. The compact camera was set up 5 cm from the specimen with the optical zoom at 1×, 29 images (narrow setting) were manually stacked. The professional setup outperforms the compact camera, producing a sharper image when specimens larger than a few centimetres are set to fill the frame optimally.
Figure 4 from: Mertens JEJ, Van Roie M, Merckx J, Dekoninck W (2017) The use of low cost compact cameras with focus stacking functionality in entomological digitization projects. ZooKeys 712: 141-154. https://doi.org/10.3897/zookeys.712.20505
Figure 4 - Images of different taxonomic groups, shot by the compact camera in manual mode (narrow setting). A large fruit-tree tortrix (Archips podana (Lepidoptera - Tortricidae)) B European paper wasp (Polistes dominula (Hymenoptera - Vespidae)), and C common earwig (Forficula auricularia (Dermaptera - Forficulidae)).
Figure 2 from: Mertens JEJ, Van Roie M, Merckx J, Dekoninck W (2017) The use of low cost compact cameras with focus stacking functionality in entomological digitization projects. ZooKeys 712: 141-154. https://doi.org/10.3897/zookeys.712.20505
Figure 2 - Visualization of the variation in image quality, level of detail and proportion of the specimen fitting the frame (insets) at different levels of optical magnification (1–4 times) and distance from the lens (11–5 cm). Every image, shot with the compact camera, is composed of 29 manually stacked images at the narrow setting and cropped to equal dimensions (approx. 1/24 of the original image). Quality and detail improve as lens distance decreases and/or the zoom increases at the cost of reduced depth of field and a smaller portion of the specimen fitting the image frame.
Figure 1 from: Mertens JEJ, Van Roie M, Merckx J, Dekoninck W (2017) The use of low cost compact cameras with focus stacking functionality in entomological digitization projects. ZooKeys 712: 141-154. https://doi.org/10.3897/zookeys.712.20505
Figure 1 - Comparison of the Elytrimitatrix digitized with the professional setup (A shot with the 60 mm macro lens and B with the Canon MP-E 65 mm lens), the compact camera's manual focus stacking mode (C) and internal stacking mode (D). A depicts the whole specimen as would be shot for publication purposes. The red box indicates the section shown in B, C, D and the blue box indicates how the specimen was framed in these three images. Note that the stronger reflections in C, D are the result of a different lighting setup.
A Pilot Study of 123I-MIP-1072 SPECT/CT Imaging With Optional Compact Gamma Camera Probe Imaging in Men With Prostate Cancer Undergoing Prostatectomy
ClinicalTrials.gov study NCT01279785. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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