By Arnaud Darmont
ISBN-10: 0819488305
ISBN-13: 9780819488305
Illumination is an important point in lots of purposes, matching the luminance of the scene with the operational variety of a digicam. whilst luminance can't be correctly managed, a excessive dynamic diversity (HDR) imaging approach will be beneficial. those structures are being more and more utilized in car on-board structures, street site visitors tracking, and different commercial, protection, and armed forces functions. This e-book offers readers with an intermediate dialogue of HDR snapshot sensors and strategies for business and non-industrial functions. It describes quite a few sensor and pixel architectures able to attaining HDR imaging, in addition to software program techniques to make excessive dynamic diversity photographs out of reduce dynamic variety sensors or photograph units. a few equipment for automated keep watch over of publicity and dynamic diversity of snapshot sensors also are brought.
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Additional info for High Dynamic Range Imaging: Sensors and Architectures
Sample text
8 SNR and DR of a linear pixel versus readout noise. models introduced in this section. In Fig. 8, the readout noise is varied (three values of readout noise yielding to tree curves in each plot). Readout noise mostly affects the sensor close to dark, and it reduces SNR and DR. In Fig. 9, it is the dark current variation that is simulated. The plots in Fig. 10 are generated by simulating a variation of full well size. The plots in Figs. 12 analyze SNR versus a variation of photocurrent or exposure time.
Active means that transistors are used for signal amplification or to perform other active tasks in the pixel. Integrating means that the pixel output is an integral function of the photons falling onto the pixel during the exposure time. , a current) and then to a voltage by means of a capacitor. This type of pixel is also said to have CVC (current-to-voltage conversion). 1 Rolling-shutter pixel architecture In rolling-shutter sensors, not all pixels are exposed at the same time, although they have the same exposure time.
17) and similarly for the lowest bound. log DR = log DRHi,2 αDRHi,1 DRHi,1 = log = log . 18) Scaling both elements will always yield the same dynamic range. As discussed earlier, there is a trade-off between performance in the dark areas and performance in bright areas, hence the need for parameter scaling. 1 General properties of human vision Rods are present in large quantities across the entire surface of the retina (wide field of view). They have high sensitivity but a low resolution. Vision based on rods is called scotopic, and the spectral response is called the scotopic curve.