Showing papers on "Dark-frame subtraction published in 1980"
01 Jan 1980
TL;DR: In this article, a monolithic color filter array for a single-chip 2/3" image color camera was used to obtain SNR of over 46dB for fixed pattern noise and 40dB for random noise.
Abstract: This report will cover a 485 × 384 element MOS solid-state imaging device with a monolithic color filter array for a single-chip 2/3" image color camera. SNR of over 46dB for fixed pattern noise and 40dB, for random noise has been obtained at scene illumination of 1O01ux, F2.8, with a noise suppression circuit.
18 citations
11 Dec 1980
TL;DR: In this article, a modification of Lee's local-statistics method is developed for digital image noise filtering without the need for a user-specified noise level, where the user specifies an approximate upper size limit for image features he is willing to regard as noise.
Abstract: : A modification of Lee's local-statistics method is developed for digital image noise filtering without the need for a user-specified noise level. Instead, the user specifies an approximate upper size limit for image features he is willing to regard as noise. A noise level is then estimated automatically for each local region of the image by partitioning the region into subregions and exploiting the differing degrees of spatial correlation for signal and noise. Extensions for use with multiplicative noise, third-moment statistics, and edge-detection schemes are discussed briefly. Examples are given for an image of 256 x 256 pixels. (Author)