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[IEEE 2018 IEEE 3rd International Conference on Image, Vision and Computing (ICIVC) - Chongqing (2018.6.27-2018.6.29)] 2018 IEEE 3rd International Conference on Image, Vision and Computing (ICIVC) - High Accuracy Smartphone Video Calibration for Human Foot Surface Mapping
摘要： Although the digital camera is readily available and the price is decreasing, many users still consider it an expensive device that can be dispensed with by using a smartphone camera. However, both the digital camera and the smartphone need to be calibrated to extract three dimensional (3D) space information from (2D) and to obtain accurate results. This study used close range photogrammetry to calibrate two high resolution digital cameras and a Samsung Galaxy smartphone to find whether any one of them give high accuracy 3D coordinates of the retro-reflective targets that were determined using the self-calibration bundle adjustment method in two phases. The first phase is during walking when 3 trials are conducted. The same three cameras are used for each trial. The second phase is during standing when one trial is conducted. Each of the camera types is placed in front of the platform. The results showed that arguably, the Samsung Galaxy S6 camera is most significant than other cameras in term of accuracy. In addition, this study provides information on how to calibrate one board from other board that has already been calibrated.
关键词： bundle adjustment,calibration,smartphone,scale bar,human foot
更新于2025-09-23 15:23:52
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Smartphone-based apparatus for measuring upconversion luminescence lifetimes
摘要： Luminescence lifetime detection plays an important role in time-resolved detection and research. However, the traditional instruments always require expensive detectors such as time-correlated single photon counter or streak camera. Herein, a low-cost and miniaturized apparatus for measuring upconversion luminescence lifetimes was developed by using a smartphone equipped with a 980 nm CW laser and a motor. When the motor was driving the sample circling at a high linear velocity, the excited sample would emit a luminescence arc, which could be photographed by the phone camera. The rotating rate could be measured by a tuner APP and then used for transferring arc length to delay times. By analyzing the grayscale distribution of the luminescence arc, the luminescence decay curve was obtained, which was then used for exponential fit and calculating lifetimes. The whole system was not only remarkably cheaper but also more miniaturized than traditional instruments for measuring luminescence lifetimes, indicating the promising applications in point of care testing for time-resolved luminescence detection for bioanalysis and disease diagnosis.
关键词： Lanthanide upconversion,Luminescence lifetime,Time-resolved,Motor,Smartphone
更新于2025-09-23 15:23:52
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A smartphone-based system for fluorescence polarization assays
摘要： This paper demonstrates the use of a smartphone-based sensor for fluorescence polarization (FP) analysis of biomolecules. The FP detection can rapidly sense ligand-analyte bindings by measuring molecule mobility, and thus, FP-based assays have been widely used for rapid diagnostics in clinics. Here, we implemented the FP detection apparatus using a 3D-printed compact holder and the built-in camera of a smartphone. The system offers accurate measurements of the degree of polarization by simultaneously detecting the fluorescence intensities parallel and perpendicular to the polarization of the excitation. The fluorescence signal of the sample is excited by a laser or light-emitting diode and separated by a polarization beam cube depending on the polarization. Parallel and perpendicular polarized emissions are projected onto two different regions of the sensor chip in the smartphone camera. A custom software app was developed to count the average intensity in the areas of interest and compute the degree of polarization. We validated the system by measuring the polarization of dye molecules dissolved in solutions with different viscosities. As an example of biomolecule sensing, a competitive FP immunoassay of Prostaglandin E2 was demonstrated using the developed system and exhibited the limit of detection of 1.57 ng/mL. The smartphone-based FP assay platform can also be implemented for the detection of toxins, disease biomarkers, and pathogens in resource-limited settings.
关键词： immunoassay,mobile sensor,fluorescence polarization assay,smartphone
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE Biomedical Circuits and Systems Conference (BioCAS) - Cleveland, OH, USA (2018.10.17-2018.10.19)] 2018 IEEE Biomedical Circuits and Systems Conference (BioCAS) - Development of a Portable Intraoral Camera and a Smartphone Application for Oral Cancer PDT Treatment Guidance and Monitoring
摘要： Oral cancer presents a public health crisis, particularly in regions where widespread use of tobacco, betel quid and acacia extract lead to disproportionately high incidences of oral malignancies. Photodynamic therapy (PDT) has shown to work efficiently in early-stage oral cancer lesions; however, physicians require a method capable of assisting them during therapy delivery, so treatments can be more effective. Several studies explore how to take advantage of photosensitized fluorescent lesions to perform imaging with the purpose of guiding and monitoring patients undergoing PDT; however, these streamlined systems for intraoral PDT treatment guidance and monitoring are needed in order for this approach to achieve optimal outcomes. This paper proposes the development of a smartphone application capable of processing images taken with an endoscopy camera directly connected to the device. PDT guidance and monitoring can be simplified, and treatment could be delivered more efficiently, increasing the chance of achieving a complete tumor response.
关键词： intraoral camera,smartphone application,image processing,android development,photodynamic therapy,Oral cancer,fluorescence
更新于2025-09-23 15:23:52
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Fingerprints mapping and biochemical sensing on smartphone by electrochemiluminescence
摘要： Electrochemiluminescence (ECL) is a kind of optical radiation process triggered by electrochemistry, which has been one of the most important strategies in analytical chemistry and biosensing. Recently, smartphone, as one of the widely-used mobile device, has provided a attractive solution as simple yet powerful sensing platform to satisfy the needs of on-site inspection. Here, ECL on smartphone was put forward for fingerprints mapping and biochemical sensing. The smartphone-based system integrated both electrochemical excitation and optical analysis by built-in functional modules “all in one phone”. Typical enhanced luminescence analysis of nicotine, quenched luminescence analysis of trinitrotoluene (TNT) demonstrated the availability of the phone-based ECL system for biochemical sensing. Furthermore, multimode imaging analysis including color induction, gray processing, and binary extraction on smartphone were used for fingerprints mapping. The grain information of fingerprints was clearly displayed on the luminescence images, even the sweat pores on fingerprints were visible to naked eyes. Finally, in situ sensing of exogenous substances on fingerprints, such as nicotine and TNT were also accomplished by the phone. Results indicated the remarkable performances of the system in ECL, especially in the fields of biochemical sensing and imaging analysis. Because fingerprints were widely used to unlock phones, the combination of fingerprints imaging and sensing on smartphone would be contributed to the development of personal medicine, public health monitoring, and mobile care testing.
关键词： Nicotine,Smartphone,Electrochemiluminescence (ECL),Trinitrotoluene (TNT),Fingerprints mapping
更新于2025-09-23 15:23:52
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Smartphone-Based Fluorescent Lateral Flow Immunoassay Platform for Highly Sensitive Point-of-Care Detection of Zika Virus Nonstructural Protein 1
摘要： Simple, inexpensive, and rapid diagnostic tests in low-resource settings with limited laboratory equipment and technical expertise are instrumental in reducing morbidity and mortality from epidemic infectious diseases. We developed a smartphone-based fluorescent lateral flow immunoassay (LFIA) platform for the highly sensitive point-of-care detection of Zika virus nonstructural protein 1 (ZIKV NS1). An attachment was designed and 3D-printed to integrate the smartphone with external optical and electrical components, enabling the miniaturization of the instrument and reduction in cost and complexity. Quantum dot microspheres were utilized as probes in fluorescent LFIA because of their extremely bright fluorescence signal. This approach can achieve quantitative point-of-care detection of ZIKV NS1 within 20 min. Limits of detection (LODs) in buffer and serum were 0.045 and 0.15 ng mL-1, respectively. Despite the high structural similarity, a high-level Dengue virus NS1 as interferent showed limited cross-reactivity. Furthermore, this assay was successfully applied to detecte ZIKV NS1 and virions spiked in complex biological samples, indicating its practical application capability. Given its low cost, compact size, and excellent analytical performance, the proposed smartphone-based fluorescent LFIA platform holds considerable potential in rapid and accurate point-of-care detection of ZIKV NS1 and provides new insight into the design and application of molecular diagnostic methods in low-resource settings.
关键词： Quantum dot microsphere,Smartphone,Lateral flow immunoassay,Zika virus nonstructural protein 1,Point-of-care
更新于2025-09-23 15:23:52
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A Novel mm-Wave Phased Array for 180° coverage for 5G Smartphone Applications
摘要： A one-dimensional array configuration capable of providing 1800 coverage for future mm-Wave 5G communications is presented. The proposed antenna array consists of 16 antenna elements located at the bottom edge of the mobile phone chassis of which 8 antenna elements are dual-polarized, broadband, broadside capacitive loaded patch antennas and the other 8 elements are broadband end-fire modified Yagi-Uda antennas placed alternately. The array configuration and its performance are discussed. The antenna element and its working principle are also presented. The proposed antenna elements exhibit wide bandwidth, low-cost fabrication uniform radiation pattern and use technique. The antenna array achieves a minimum realized gain of 12.1 dBi throughout the 1800 sector making it suitable for implementation for 5G smartphone applications.
关键词： Yagi Uda,phased array,smartphone,patch antenna,mm-Wave,5G,antenna
更新于2025-09-23 15:23:52
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ObstacleWatch
摘要： Walking while using a smartphone is becoming a major pedestrian safety concern as people may unknowingly bump into various obstacles that could lead to severe injuries. In this paper, we propose ObstacleWatch, an acoustic-based obstacle collision detection system to improve the safety of pedestrians who are engaged in smartphone usage while walking. ObstacleWatch leverages the advanced audio hardware of the smartphone to sense the surrounding obstacles and infers fine-grained information about the frontal obstacle for collision detection. In particular, our system emits well-designed inaudible beep signals from the smartphone built-in speaker and listens to the reflections with the stereo recording of the smartphone. By analyzing the reflected signals received at two microphones, ObstacleWatch is able to extract fine-grained information of the frontal obstacle including the distance, angle and size for detecting the possible collisions and to alert users. Our experimental evaluation under two real-world environments with different types of phones and obstacles shows that ObstacleWatch achieves over 92% accuracy in predicting obstacle collisions with distance estimation errors at about 2 cm. Results also show that ObstacleWatch is robust to different sizes of objects and is compatible to different phone models with low energy consumption.
关键词： Smartphone,Acoustic Ranging,Mobile Sensing,Pedestrian Safety,Acoustic Localization
更新于2025-09-23 15:23:52
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Assessing the accommodation response after near visual tasks using different handheld electronic devices
摘要： Purpose: To assess the accommodation response after short reading periods using a tablet and a smartphone as well as determine potential differences in the accommodation response at various stimulus vergences using a Hartmann-Shack aberrometer. Methods: Eighteen healthy subjects with astigmatism of less than 1 D, corrected visual acuity of 20/20 or better, and normal findings in an ophthalmic examination were enrolled. Accommodation responses were obtained under three different conditions: accommodation system of the eye relaxed and visually stressed with a tablet and an smartphone for 10 min, at a distance of 0.25 m from the subject's eyes. Three measurements of accommodation response were monocularly acquired at stimulus vergences ranging from 0 to 4 D (1-D step). Results: No statistically significant differences were found in the accommodation responses among the conditions. A moderate but gradually increasing root mean square, coma-like aberration was found for every condition. Conversely, the spherical aberration decreased as stimulus vergences increased. These outcomes were identified in comparison to the one-to-one ideal accommodation response, implying that a certain lag value was present in all stimulus vergences different from 0 D. Conclusions: The results support the hypothesis that the difference between the ideal and real accommodation responses is mainly attributed to parameters associated with the accommodation process, such as the near visual acuity, depth of focus, pupil diameter, and wavefront aberrations. The wavefront aberrations were dependent on the 3-mm pupil size selected in this study. The accommodation response was not dependent on the electronic device employed in each condition, and it was mainly associated with young age and level of amplitude of accommodation of the subjects.
关键词： Computers, handheld,Smartphone,Accommodation, ocular
更新于2025-09-23 15:22:29
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Smartphone capture of flexible laryngoscopy: Optics, subsite visualization, and patient satisfaction
摘要： Objective: To determine whether a smartphone adaptor can record laryngoscopic videos of adequate quality for clinical diagnosis and communication among otolaryngologists and assess the impact of recorded exams on patient satisfaction. Methods: Twenty adult inpatients undergoing flexible laryngoscopy in a tertiary care medical center were prospectively enrolled. Each subject's larynx was visualized with the standard laryngoscope eyepiece and with an attached mobile phone adaptor with video recording capabilities. A 5-point Likert scale was used by the resident performing the scope to grade the adaptor and eyepiece exams. The same scale was used by an offsite otolaryngology attending to grade the adaptor video. Patients were shown the video, and a satisfaction survey was administered. Results: In all patients, the adaptor was easy to use and required minimal setup. Ninety percent of patients reported an increase in satisfaction after watching the video of their exam. The eyepiece was superior to the adaptor in resolution, focus, color fidelity, brightness, and optical fluidity (P < 0.05). The video recording was deemed sufficient for clinical assessment in 90% of cases. The offsite reviewer determined that there would be 'little' (15%) or 'no value' (65%) in repeating the scope exam in the majority of patients. The laryngeal subsites were equally visible with the eyepiece and the adaptor ('full view,' 85%–100%). Conclusion: Laryngoscopy videos recorded by a portable smartphone adaptor are sufficient for clinical evaluation in the majority of cases. This technology may improve patient satisfaction and communication among clinicians.
关键词： Laryngoscopy,smartphone,flexible laryngoscopy,telehealth
更新于2025-09-23 15:22:29