Computer Vision

Outline

Digital imaging has enabled a global culture of visual communications. The ubquitous smartphones of the current era enable image capture, editing, and instant global transmission for literally billions of people. That technology can also be brought to bear in the laboratory.

Need a Diagram: Staging/Lighting –> Image Formation (Lenses) –> Image Capture (Sensors) –> Image Processing and Segmentation (Computer Vision) –> Machine Learning

Light, Perception, and Color

Light, color, and human perception.

Lenses and Image Formation

Introduction to imaging and lenses

• https://coinimaging.com/photo_articles.html

Finite versus Infinite Conjugation

Fourier Optics

Image Sensors

Raspberry Pi Cameras

• Raspberry Pi Camera Module 2 A fixed focus color camera baased on the 8 MP Sony IMX219 sensor. Ships with fixed focus lens and CSI cable.

• Raspberry Pi HQ Camera

Arducam produces a range of camera modules, lenses, and accessories for Raspberry Pi and other single board computers and microcontrollers.

• Arducam High-Resolution Autofocus Camera is a 16 MP camera based on the Sony IMX519 sensor, mounted in the small format of the Raspberry Pi Camera V2, and equipped with an autofocus lens. The IMX519 is a back-side illuminated, stacked sensor, used in recent generation smartphones.

Other Third Party Devices

• Weewoday OV5647 1080p Similar to Raspberry Pi Version 1 camera.

Thermal Imaging

• Grove - Thermal Imaging Camera - MLX90641 BCB 16x12 IR Array with 55° FOV

Macro/Micro Photography

Concepts

• Magnification

Conventional Macro

• Triplet achromats. Infinite conjugation achromatic triplets are available as commercial at low-cost from Raynox.

• Mitakon Zhongyi 20mm f/2 4.5x Super Macro Lens

• Venus Optics Laowa 25mm f/2.8 2.5-5X Ultra Macro Lens

• Yasuhara Nanoha Macro Lens 5:1

• Venus Optics Laowa 24mm f/14 Probe Lens

Microscope Objectives

• Edmund Scientific. Understanding Microscopes and Objectives

• MJKZZ. Using Microscope Objectives For Beginners

• MJKZZ Microscope to Filter Thread adapters (https://www.mjkzz.com/product-page/4x-plan-infinite-microscope-objective-with-rms-adapter)

• Hayear Lenses and Accessories

Open Source Projects

• UC2 - Open and Modular Optical Toolbox A comprehensive set of low-cost 3D-printed modules for assembling microscopes and imaging systems based on 4f Fourier optical arrangements.
  
  Diederich, B., Lachmann, R., Carlstedt, S. et al. A versatile and customizable low-cost 3D-printed open standard for microscopic imaging. Nat Commun 11, 5979 (2020). https://doi.org/10.1038/s41467-020-19447-9