Engineering:Pinspeck camera
From HandWiki
A pinspeck camera is the complement, or anti-pinhole, of a pinhole camera, using an opaque dot in a clear aperture instead of a small hole.[1][2] Each object point casts the dot's shadow onto the image plane, producing a weak negative image.[1][2]
Principle
In a pinspeck camera, image formation occurs through selective blocking rather than transmission: each object point casts the shadow of the opaque speck onto the image plane.[1] Torralba and Freeman describe the same complementary effect for an occluder, whose cast shadow can contain a negative image of the surrounding scene rather than only the occluder's silhouette.[3]
- ↑ 1.0 1.1 1.2 Young, M.. "Quantum noise limits the pinspeck camera to simple objects". Optica Acta: International Journal of Optics. https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=10374. Retrieved 2026-09-06.
- ↑ 2.0 2.1 Cohen, Adam Lloyd (1982). "Anti-pinhole Imaging". Optica Acta: International Journal of Optics 29 (1). https://www.tandfonline.com/doi/abs/10.1080/713820733.
- ↑ Torralba, Antonio; Freeman, William T.. "Accidental Pinhole and Pinspeck Cameras". Optica Acta: International Journal of Optics. https://idp.springer.com/transit?redirect_uri=https%3A%2F%2Flink.springer.com%2Farticle%2F10.1007%2Fs11263-014-0697-5&code=f508d872-4240-4c7d-a94f-4a60522f28dd. Retrieved 2026-09-06.
External links
- Jearl Walker The Pleasure of the Pin Hole Camera and Its Relative the Pinspeck Camera
- Adam Lloyd Cohen Anti-pinhole imaging Optica Acta: International Journal of Optics Volume 29, Issue 1, 1982
- Antonio Torralba and William T. Freeman Accidental Pinhole and Pinspeck Cameras
- M. Young Quantum noise limits the pinspeck camera to simple objects
- Johannes Grebe-Ellis and Thomas Quick Soft shadow images
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