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Equivalence theory for cross-format photographic image quality comparisons

机译:等价理论用于跨格式摄影图像质量比较

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摘要

Equivalence theory is commonly used by photographers in order to obtain equivalent photographs from cameras based on different sensor formats. A complete mathematical proof of equivalence theory that is valid for compound photographic lenses with any chosen pupil magnification is presented. An expression for a correction to the conventional equivalence formulae is derived, which is proven to be formally required whenever focus is set closer than infinity, although numerically significant only for macro photography. Additionally, this paper argues that equivalence theory should be used in practice to appropriately perform cross-format image quality comparisons and demonstrates how various common metrics should be evaluated.
机译:摄影师通常使用等效理论,以便基于不同的传感器格式从相机中获取等效照片。提出了等效理论的完整数学证明,该理论对具有任何选定瞳孔放大倍率的复合摄影镜头均有效。得出了对传统等效公式的校正表达式,事实证明,只要将焦点设置为比无穷大,就正式需要该表达式,尽管在数值上仅对微距摄影有效。此外,本文认为等效理论应在实践中用于适当地执行跨格式图像质量比较,并说明应如何评估各种通用指标。

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