Thermal infrared imaging technology based method and device for detecting the early defect of fruit surface

Abstract

The invention discloses thermal infrared imaging technology based method and device for detecting the early defects of fruit surfaces. The device comprises belt type transmission system, an infrared lamp, a beat fixing system, a dividing turnplate, a fixed bed, a step drive system, a salver, an electric motor, an thermal infrared imager, a computer and fruit defect detection software. Fruits are excited by a thermal light source of the controlled infrared lamp in transportation and rotate at constant speed during detection; a vertical temperature measuring line of the thermal infrared imager aims at the centers of the fruit surfaces and dynamically collect the temperature information of the fruit surfaces at angles of 360 degrees; and the fruit defect detection software denoises and reinforces acquired images and temperature curve information, contrasts thermal images and judges the early defects of the fruit surfaces according to waveform inference. The invention coverts the fruit surface information into one-dimensional temperature information and can well realize the detection of the early defects of the fruit surfaces by combining image information, thereby creating conditions for the refined classification of the fruits.

Description

technical field [0001] The invention relates to a method and device for early detection of fruit surface defects by infrared thermal imaging technology Background technique [0002] Early defect detection of fruit has always been one of the very important steps in the processing of agricultural products. Early fruit defects often include two aspects of external defects and internal defects. The external defects of fruits are generally caused by two situations, one is due to the influence of natural conditions, such as insect eyes, scars, fruit rust, cracking, etc.; the other is caused by human factors, such as during or after picking Skin scratches and mechanical damage caused by external forces, especially early mechanical damage with slight depression, slightly darkened color, no juice overflow, difficult to detect with naked eyes, easy invasion of pathogenic microorganisms, etc., are the most common causes of fruit mold and rot. main reason. For more serious damage (su...

AI Technical Summary

Problems solved by technology

At present, judging from the research situation at home and abroad, the early detection of fruit defects based on infrared thermal imaging technology is mainly offline research, and a small amount of line detection research is mainly multi-eye imaging, using infrared cameras as an auxiliary means combined with other cameras. , which increases the cost and complexity of the detection system, and it is difficult to detect the complete fruit surface by using a conveyor with rollers moving while rotating. Therefore, it is necessary to develop an online detection device for early-stage defects of fruits based on a single-camera imaging system. To meet the development of fruit deep processing technology and people's increasing demand for food quality

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