什么是暗信号？

DSNU

1) Background

a. Definition: DSNU (Dark Signal Non-Uniformity) is a measure of the distribution of dark output voltages (dark current) for each pixel.

2) Methods

In measuring the DSNU, we took photographs with the cap covering the lens of the Nikon D70, so that no light would enter the camera. Switching the camera into the manual mode, we manually control the settings of the exposure time and the f-stop. We then photographed a series of 100 images with the Nikon D70 for each exposure time: 1, 2, 4, 8, 15, 20, 25, and 30 seconds. We then downloaded the image data into the computer in order to process using MATLAB code that we designed. Utilizing the steps provided in the handout by the EE 362 course instructors, our MATLAB code completed the following steps:

Calculate the time average of the sequence for each pixel, which removes the temporal noise (read noise).

TEMPORAL AVERAGE:

Let