I’m going to set PRNU aside, and get on with the photon transfer main event: photon noise and read noise. The reason for moving on so quickly from PRNU is not because I’ve exhausted the analytical possibilities — I’ve just scraped the surface. But with modern cameras, PRNU is not normally something that materially affects… [Read More]
Sensor photon transfer analysis: PRNU
There are two groups of exposures that need to be made to characterize the photon transfer characteristics of a sensor. Both are flat-field images. If you want to use a white or gray card, illuminate it evenly, defocus the lens, use a fairly long focal length (135mm is my favorite), and crop to the central… [Read More]
A single-pixel sensor model
In analyzing the photon transfer performance of a digital camera, it is usual to construct a model of the camera’s imaging properties, and then determine the parameters of these properties should the camera under test conformed to the model. It is also useful to know those areas for the camera does not work as the… [Read More]
Automatic sensor characterization, an introduction
You may have noticed a decrease in the number of my postings over the last month or so. It’s not that I’ve been idle. Quite the contrary, I’ve been working on a major project. In this post, I’d like to introduce you to it. Usually, I work alone. However, in the effort I’m going to… [Read More]
Stay with medium format?
Yesterday, I posted an email that I sent to a friend, asking for advice. Here’s his answer: I feel your pain. I have pissed away more money on electronic imaging gear over the years than I care to think about – including over $100K for an Optronics drum scanner in the early 90’s. I’ve made… [Read More]
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