Online Hyperspectral Line-Scan Fluorescence Imaging for Safety Inspection of Apples

Abstract

A recently developed fast hyperspectral line-scan imaging system integrated with a commercial apple-sorting machine was evaluated for rapid detection of animal faeces matter on apples online. Golden Delicious apples obtained from a local orchard were artificially contaminated with thin smear of cow faeces. For the online trial, hyperspectral fluorescence images of 30 contiguous spectral channels from 400 to 700 nm were acquired from samples moving at a processing sorting-line speed of three apples per second. Based on fluorescence ratio as a multispectral image fusion method, a 100% detection rate (118 out of 118 faeces treated apples) with no false positives (0 out of 120 apples, 60 wholesome and 60 apples with defects acquired prior to the faeces treatment) were achieved.

The development of the line-scan image recognition algorithm for the detection of frass on mature tomatoes

“…Two LED line lights provided near-uniform illumination to the linear field of view for fluorescence excitation at 405 nm, and were built in-house using four violet 10-watt LEDs (LED Engin Inc., San Jose, CA) for each line light. The fluorescence emission showed promising potentials to provide useful contrast between fecal material and the fruit surfaces 12,15 . In this study, the tomatoes were positioned, with contamination spots facing up, on a tray lined with nonfluorescent black cloth and placed on the positioning table, simulating sample movement on processing lines.…”

“…A variety of non-destructive machine vision systems have been developed to target the rapid inspection of food products for food safety and quality 12,13 . Among these, hyperspectral line-scan imaging systems have recently demonstrated great potential for direct application to food processing lines 11,14 .…”

Quality and safety assessment of food and agricultural products by hyperspectral fluorescence imaging

“…Kim and Lefcourt87 developed a prototype of a fast hyperspectral line‐scan imaging system, which was integrated with a commercial apple‐sorting machine for rapid detection of animal faeces matter on apples online (Fig. 6).…”

Application of Infrared Spectroscopy in the Detection of Coal Quality of Power Plant

“…Spectral imaging technology not only has a higher spectral resolution but also has the image resolution. therefore, by using spectral imaging technique could detect objects with qualitative analysis, quantitative analysis and the positioning analysis [3].…”