scholarly journals TACTILE IMAGE SENSOR USING FABRICS AND OPTICAL WAVEGUIDE

1990 ◽  
Vol 46 (2) ◽  
pp. 82-84
Author(s):  
Yoshio Shimizu ◽  
Kouichiro Toriumi ◽  
Tadashi Ishikawa ◽  
Kei Tanaka ◽  
Takao Furukawa ◽  
...  
Keyword(s):  
Optical Waveguide ◽  
Image Sensor ◽  
Tactile Image

FPGA-based tactile image sensor

2019 ◽  
Vol 2019 (0) ◽  
pp. 2A2-H05
Author(s):  
Kouki UNNO ◽  
Kazuhiro SHIMONOMURA
Keyword(s):  
Image Sensor ◽  
Tactile Image

scholarly journals Tactile Image Sensors Employing Camera: A Review

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3933 ◽  
Author(s):  
Kazuhiro Shimonomura
Keyword(s):  
Image Sensor ◽  
Image Sensors ◽  
Physical Contact ◽  
Tactile Information ◽  
Conductive Plate ◽  
Image Analysis Algorithm ◽  
Tactile Image ◽  
Sensor Configuration ◽  
Displacement Based ◽  
Typical Design

A tactile image sensor employing a camera is capable of obtaining rich tactile information through image sequences with high spatial resolution. There have been many studies on the tactile image sensors from more than 30 years ago, and, recently, they have been applied in the field of robotics. Tactile image sensors can be classified into three typical categories according to the method of conversion from physical contact to light signals: Light conductive plate-based, marker displacement- based, and reflective membrane-based sensors. Other important elements of the sensor, such as the optical system, image sensor, and post-image analysis algorithm, have been developed. In this work, the literature is surveyed, and an overview of tactile image sensors employing a camera is provided with a focus on the sensing principle, typical design, and variation in the sensor configuration.

scholarly journals Detection of Foreign Bodies in Soft Foods Employing Tactile Image Sensor

2021 ◽  
Vol 8 ◽  
Author(s):  
Kazuhiro Shimonomura ◽  
Tinghsuan Chang ◽  
Tomomi Murata
Keyword(s):  
Foreign Bodies ◽  
High Sensitivity ◽  
Tactile Sensor ◽  
Image Sensor ◽  
Target Object ◽  
Sensor Surface ◽  
Foreign Objects ◽  
Inspection Process ◽  
Tactile Image ◽  
Inspection Work

In the inspection work involving foodstuffs in food factories, there are cases where people not only visually inspect foodstuffs, but must also physically touch foodstuffs with their hands to find foreign or undesirable objects mixed in the product. To contribute to the automation of the inspection process, this paper proposes a method for detecting foreign objects in food based on differences in hardness using a camera-based tactile image sensor. Because the foreign objects to be detected are often small, the tactile sensor requires a high spatial resolution. In addition, inspection work in food factories requires a sufficient inspection speed. The proposed cylindrical tactile image sensor meets these requirements because it can efficiently acquire high-resolution tactile images with a camera mounted inside while rolling the cylindrical sensor surface over the target object. By analyzing the images obtained from the tactile image sensor, we detected the presence of foreign objects and their locations. By using a reflective membrane-type sensor surface with high sensitivity, small and hard foreign bodies of sub-millimeter size mixed in with soft food were successfully detected. The effectiveness of the proposed method was confirmed through experiments to detect shell fragments left on the surface of raw shrimp and bones left in fish fillets.

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