Estimation of chlorophyll content in Brassica napus based on unmanned aerial vehicle images

The chlorophyll content has a direct effect on photosynthesis of crops.In order to explore a quick and convenient method for estimating the chlorophyll content of Brassica napus and facilitate efficient crop monitoring,we measured the actual value of chlorophyll with a SPAD-502 chlorophyll detector,and collected aerial images of B.napus with an unmanned aerial vehicle(UAV)carrying a RGB camera in this study.The total number of 270samples collected images were divided into regions according to the planting conditions of different B.napus varieties in the field.Then,according to the empirical formula,there were 36 colors’characteristic parameters calculated and combined.To estimate the chlorophyll content of rape,189 samples were included in the modeling set,while the other 81 samples were enrolled in the validation set for testing the accuracy of this model.After the combination of R(red),G(green)and B(blue)color channels,the results showed that the color characteristics B/(R+G),b,B/G,(G-B)/(G+B),g-b were highly connected with the measured value of chlorophyll SPAD,and the correlation coefficient between the combination based on B/(R+G)and SPAD value was 0.747.With R2=0.805,RMSE=3.343,and RE=6.84%,the regression model created using random forest had superior outcomes,according to the model comparison.This study offers a new method for quickly estimating the amount of chlorophyll in rapeseed and a workable reference for crop monitoring using the UAV platform.

Visibility of the bleeding point in acute rectal hemorrhagic ulcer using red dichromatic imaging:A case report

BACKGROUND Red dichromatic imaging(RDI)is a novel image-enhanced endoscopy expected to improve the visibility of the bleeding point.However,it has not been thoroughly investigated.CASE SUMMARY A 91-year-old man developed a sudden massive hematochezia and underwent emergent colonoscopy.An ulcer with pulsatile bleeding was found on the lower rectum.Due to massive bleeding,the exact location of the bleeding point was not easy to detect with white light imaging(WLI).Upon switching to RDI,the bleeding point appeared in deeper yellow compared to the surrounding blood.Thus,RDI enabled us for easier recognition of the bleeding point,and hemostasis was achieved successfully.Furthermore,we reviewed endoscopic images and evaluated the color difference between the bleeding point and surrounding blood for WLI and RDI.In our case,the color difference of RDI was greater than that of WLI(9.75 vs 6.61),and RDI showed a better distinguished bleeding point from the surrounding blood.CONCLUSION RDI may improve visualization of the bleeding point by providing better contrast in color difference relative to surrounding blood.

Effect of ultrasound-guided acupotomy vs electro-acupuncture on knee osteoarthritis:a randomized controlled study

OBJECTIVE:To investigate the effect of acupotomy on knee osteoarthritis(KOA),compared to electro-acupuncture(EA).METHODS:Sixty KOA patients were randomly divided into 2 groups:ultrasound-guided acupotomy group and EA group;each had 3 weeks' therapy.After the treatment,by contrast before and after therapy,by comparing curative effects among groups,we looked into disease improvement degree through activities of daily living score(ADL),hospital for special surgery index(HSS),visual analogue scales score(VAS) and knee joint's infrared thermal imaging detection.RESULTS:Graded by ADL,the excellent rate in acupotomy group was much higher than EA group;both acupotomy group and EA group had obviouschanges in HSS index before and after the therapy(P < 0.01).And there was remarkable difference in HSS index variation between the groups(P < 0.01).Acupotomy group and EA group showed big difference in pain index before and after treatment(P <0.01).Apparent difference also existed in the comparison among groups(P < 0.01).Both acupotomy group and EA group had apparent changes in infrared thermal imaging detection before and after the treatment(P < 0.01).CONCLUSION:Acupotomy and EA both have significant effects in KOA treatment;the former is better than the latter in relieving pain and improving knee functions.