Field of view vs focal length – everything you need to know - focal length vs distance

 2024-07-25 04:12:26

Saturation Capacity (e-) Explained: Each pixel contains a photodiode to convert photons to electrons. After conversion these electrons are also temporarily stored in the photodiode until they are transferred out. Saturation capacity measures the maximum capacity of the photodiode to hold these electrons. When capacity is reached, the sensor hits its maximum signal level and the electrons start to overflow and are discarded. A sensor that has reached capacity would result in a white image. Larger saturation capacity allows for more range in sensing levels of light.

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Absolute Sensitivity Threshold (y) Explained: Absolute sensitivity threshold result shows the the lowest amount of light needed to go over the noise of the sensor. The lower the result the less light needed to differentiate useful imaging data from noise. Lower results produce better sensitivity in low light environments.

Dynamic Range (dB) Explained: Dynamic range is the ratio of the maximum signal level (saturation capacity) to the minimum signal level (temporal dark noise) of the sensor. The higher the dB the better the sensor’s ability to show levels of grayscale detail from the brightest areas to the darkest areas in a scene. This is important when imaging scenes with both very bright and dark sections.

Signal to Noise Ratio (dB) Explained: The signal-to-noise ratio, also known at SNR, measures how much useful image data is distinguished from temporal dark noise. For example, a result of 40 dB means that there is 40 dB of image data higher than the level of noise. The higher the SNR, the clearer the image is.

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Temporal Dark Noise (e-) Explained: Temporal dark noise measures noise when no light is entering the sensor. Due to surrounding sensor electronics and pixel components, random unwanted electrons are created that can enter the pixel and pixel pipeline resulting in noise. Newer sensors employ better technology and pixel structures to help reduce noise and shield sensor components from thermal fluctuations. A lower temporal dark noise is better as it will result in cleaner looking images, especially in low light conditions.

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Quantum Efficiency (%) Explained: Quantum efficiency, also known as QE, measures how efficient a pixel is at converting incident light (photons) into an electrical charge (electrons) at a specific wavelength (nm). Not every photon that enters a pixel is converted to an electron. The higher the percentage the less light a sensor needs to gather useful imaging data. Quantum efficiency results are usually shown for the visible spectrum range (300-700 nm) and near IR range (700-1100 nm). Depending on the sensor technology and specific wavelength the QE results will be different. A higher result is better.