pattern noise 예문

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Fixed pattern noise can be easily removed using flat field correction.
Many patents and methods exist to reduce or eliminate fixed pattern noise in digital imagers.
Visible fixed-pattern noise is often caused by hot pixels pixel sensors with higher than normal dark current.
In X-ray imaging, the acquired projection images generally suffer from fixed-pattern noise, which is one of the limiting factors of image quality.
In X-ray Computed Tomography ( CT ), fixed-pattern noise is known to significantly degrade the achievable spatial resolution and generally leads to ring or band artifacts in the reconstructed images.
The voltage noise variance in a soft-reset ( gate-voltage regulated ) pixel is V _ n ^ 2 = kT / 2C, but image lag and fixed pattern noise may be problematic.
However, CCDs continued to have much lower temporal noise and fixed-pattern noise and were the dominant technology for consumer applications such as camcorders as well as for broadcast cameras, where they were displacing video camera tubes.
The pattern of different dark currents can result in a fixed-pattern noise; dark frame subtraction can remove an estimate of the mean fixed pattern, but there still remains a temporal noise, because the dark current itself has a shot noise.
The " holes " are accumulated, or trapped, in a separate semiconductor layer that acts as a diode that prevents them from returning or creating noise . " HAD " technology suppresses the fixed pattern noise that results from " dark " current that occurs regardless of the amount of absorbed light.
Eric Fossum, " et al . ", invented the image sensor that used intra-pixel charge transfer along with an in-pixel amplifier to achieve true correlated double sampling ( CDS ) and low temporal noise operation, and on-chip circuits for fixed-pattern noise reduction, and published the first extensive article predicting the emergence of APS imagers as the commercial successor of CCDs.