Development Of Wireless Video Nystagmus Recorder For BPPV Diagnosis And Treatment

BPPV(Benign Positional Paroxysmal Vertigo)benign paroxysmal positional vertigo is the most common type of clinical vertigo,and studies have shown that 10.7-64.0 patients per 100,000 people,the lifetime prevalence rate is 2.4%,and The recurrence rate is as high as 15% within one year.Various dislocation tests and corresponding manual reduction therapy have been used as the gold standard and treatment method for BPPV at home and abroad.However,due to different clinical experience and different treatment methods,the diagnosis and treatment effects of the disease are quite different.The key to the diagnosis of BPPV is to judge the type of disease according to the nystagmus induced by the displacement experiment.The modern video nystagmus method is widely used in nystagmus recording and clinical application due to its unique advantages.This paper studies the current status of video nystagmus recorders,the existing nystagmus recorders are expensive and not conducive to promotion,the use of wired transmission leads to poor spatial rotatability,the acquired nystagmus video frame rate and low resolution result in low system accuracy.Therefore,there is a need for a wireless video nystagmus recorder that is inexpensive,wirelessly transmitted,and highly accurate,enabling accurate real-time tracking of nystagmus and improving the diagnosis and treatment rate of BPPV.This paper proposes a wireless video nystagmus recorder based on ARM Cortex-A7 architecture and the latest 5GHz WiFi module,and a fast nystagmus tracking algorithm based on Haar feature and least squares ellipse fitting under high HD frame rate video.Accurate real-time tracking of nystagmus.The main work and research content of this paper are as follows:(1)Wireless video nystagmus recorder design.The main work of this part is: designing the hardware structure of the wireless video nystagmus recorder,using the ARM Cortex-A7 architecture and the latest 5GHz WiFi module,designing a high-speed MIPI interface to connect the camera,and designing a special nystagmus collection light path and eye mask Structure;design the software structure of the wireless video nystagmus recorder,encode the nystagmus video data acquired by the camera into a high-compression,low-loss H.265 code stream,and then transmit the H.265 code stream to the PC in real time using the LIVE555 framework.(2)Acquisition of nystagmus information in BPPV diagnosis and treatment.The main work of this part is: extracting the region of interest using the Haar feature on the received dark image,then performing morphological processing and Gaussian filtering,then performing edge detection to obtain the pupil contour,and performing least squares ellipse fitting according to the pupil contour.The center of the ellipse after fitting is the center of the pupil,and the pupil center of each frame image is connected to generate an eye movement curve,and the eye nystagmus information of the patient is obtained according to the eye movement curve.(3)The high-frame rate nystagmus video has a gain effect on BPPV diagnosis and treatment.The main work of this part is: verifying the high-definition high-frame rate video through experimental analysis improves the accuracy of the system,and also improves the sensitivity of the eye movement curve,which is beneficial to the detection of weak nystagmus and reduces the impact of blinking.