Synopsis
See how photography can measure fish with pinpoint accuracy in the field and lab. This study describes a portable photographic measuring device designed to capture three‑dimensional distances on fish and other objects, with the goal of reducing operator bias and increasing repeatable accuracy.
In clear, practical terms, the paper explains why measurements from photographs can form permanent records, support analyses of visual characteristics, and enable rapid work in cannery and field environments. It covers how the device uses two cameras, a reference line, and carefully defined geometry to determine longitudinal distances, while addressing parallax and perspective errors. The discussion also outlines performance criteria, testing methods, and suggested improvements for portability, automatic features, and overall accuracy.
- Learn how a two‑camera setup projects three‑dimensional points onto a reference line to compute distances
- See how measurements from film are read and converted into precise longitudinal lengths
- Understand the practical trade‑offs of field portability, speed, and measurement accuracy
- Explore potential enhancements, like automatic film reading and digital data processing
Ideal for readers of fisheries science, measurement technology, or research methods who want a concrete case of photographic measurement applied to biological data.
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Photographic Device for Accurately Measuring Fish (Classic Reprint)
impression à la demandeVendeur : Forgotten Books, London, Royaume-Uni
Évaluation du vendeur 4 sur 5 étoiles
Paperback. Etat : New. Print on Demand. This book is a detailed exploration of a photographic measuring device developed to accurately measure fish. This device, a technological marvel of its time, was designed to aid the work of the International North Pacific Fisheries Commission in understanding the subtle differences between salmon races and differentiating North American from Asian stocks. The author meticulously details the device's construction and intricate workings, including its base and framework, the strobe light and power pack, the camera assembly, and the innovative automatic features. Beyond its practical applications, the book delves into the theoretical underpinnings of the photographic method, examining the complexities of parallax and perspective error in measuring three-dimensional objects. The author offers a rigorous analysis of the scientific principles behind the device's operation, providing a comprehensive understanding of its accuracy and potential for future development. The book's insights into the challenges and triumphs of measuring fish in the field shed light on the crucial role of technology in scientific advancement and offer a fascinating glimpse into the methods and innovations of the era. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. N° de réf. du vendeur 9781333941895_0
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EUR 15,27
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Photographic Device for Accurately Measuring Fish Classic Reprint
Vendeur : PBShop.store US, Wood Dale, IL, Etats-Unis
Évaluation du vendeur 5 sur 5 étoiles
PAP. Etat : New. New Book. Shipped from UK. Established seller since 2000. N° de réf. du vendeur LW-9781333941895
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EUR 24,33
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Expédition nationale : Etats-Unis
Expédition nationale : Etats-Unis
Quantité disponible : 15 disponible(s)
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Photographic Device for Accurately Measuring Fish Classic Reprint
Vendeur : PBShop.store UK, Fairford, GLOS, Royaume-Uni
Évaluation du vendeur 5 sur 5 étoiles
PAP. Etat : New. New Book. Shipped from UK. Established seller since 2000. N° de réf. du vendeur LW-9781333941895
Acheter neuf
EUR 23,95
Expédition à EUR 3,81
Expédition depuis Royaume-Uni vers Etats-Unis
Expédition depuis Royaume-Uni vers Etats-Unis
Quantité disponible : 15 disponible(s)