1. KYOTO UNIVERSITY 京都大学 Effectiveness of PL Filtering Image with Halogen Lamp for Agricultural Products

2. KYOTO UNIVERSITY 京都大学 Problems on image acquisition Halation Surrounding walls reflection

3. KYOTO UNIVERSITY 京都大学 Cuticular layer of apple fruit Cuticular layer Epidermis Parenchyma Halation

4. KYOTO UNIVERSITY 京都大学 Objectives To investigate relation between cuticular layer and fruit surface gloss To investigate effectiveness of PL filtering image compared with conventional dome and diffuser-used images

5. KYOTO UNIVERSITY 京都大学 Dome or diffuser Diffuser Halation Wall reflection Light Camera Reflection plate Indirect lighting devices (Dome and Diffuser)

6. KYOTO UNIVERSITY 京都大学 Direct Lighting Device with PL filter PL filterHeat absorption filters Fan (more than 1000nm) (800 ～ 1000nm) Halogen lamp PL filtering Light Camera PL filter True color PL filter

7. KYOTO UNIVERSITY 京都大学 Comparison of lamps Price Low Low Mid High High Halogen Incandescent Fluorescent LED HID Brightness High Mid Low Low High Color rendering High High Low Mid Mid Lumen High High Mid High Low Maintenance Life Mid Short Mid Long Long

8. KYOTO UNIVERSITY 京都大学 Direct lighting device with LEDs 120 white LEDs Easy control: Quick Response for input signal

9. KYOTO UNIVERSITY 京都大学 Lighting Device Arrangement Arrangement 1 (Dome walls and 4 DLs) Arrangement 2 and 3 (Diffusers or PL filters and 4 DLs)

10. KYOTO UNIVERSITY 京都大学 Materials category 1 (glossy surface fruits: apples, tomato, eggplant, pepper, lemon) category 2 (short hair fruits or powdery fruits: kiwi, peach, pear, banana) category 3 (root vegetables: potato, Daikon radish)

11. KYOTO UNIVERSITY 京都大学 Category 1 (Smooth and thick cuticle) Dome DiffuserPL filter Apple Eggplant

12. KYOTO UNIVERSITY 京都大学 Category 2 (Rough cuticle) Dome DiffuserPL filter Peach Pear

13. KYOTO UNIVERSITY 京都大学 Category 3 (No cuticle) Dome DiffuserPL filter Daikon radish Potato

14. KYOTO UNIVERSITY 京都大学 Relation between degree of gloss and cuticular layer thickness Category 1 Category 2 Category 3 (100 pixels is almost 25  m.) Degree of gloss: SD within twice area of halation

15. KYOTO UNIVERSITY 京都大学 Images on different exposure conditions Dome DiffuserPL filter Exp.1 (dark) Exp.2 (mid) Exp.3 (bright)

16. KYOTO UNIVERSITY 京都大学 HSI on different exposure conditions Dome DiffuserPL filter Exp.1 (dark) Exp.2 (mid) Exp.3 (bright)

17. KYOTO UNIVERSITY 京都大学 Hue Exp.1 (dark) Exp.2 (mid) Exp.3 (bright) Dome DiffuserDL with PL filter

18. KYOTO UNIVERSITY 京都大学 Hue on different exposure conditions (Average hue value change except too bright and too dark pixels)

19. KYOTO UNIVERSITY 京都大学 Saturation Exp.1 (dark) Exp.2 (mid) Exp.3 (bright) Dome DiffuserDL with PL filter

20. KYOTO UNIVERSITY 京都大学 Saturation on different exposure conditions (Average hue value change except too bright and too dark pixels)

21. KYOTO UNIVERSITY 京都大学 Conclusion Degree of gloss (halation) on fruit had proportional relation with thickness of cuticular layer. PL filtering image had higher color reproduction compared with diffuser or dome. Dome made larger low saturation area.