By Junichi Nakamura
Shrinking pixel sizes in addition to advancements in picture sensors, optics, and electronics have increased DSCs to degrees of functionality that fit, and feature the capability to surpass, that of silver-halide movie cameras. snapshot Sensors and sign Processing for electronic nonetheless Cameras captures the present nation of DSC photo acquisition and sign processing expertise and takes an all-inclusive examine the sector, from the historical past of DSCs to destiny percentages. the 1st bankruptcy outlines the evolution of DSCs, their simple constitution, and their significant program sessions. the following few chapters speak about fine quality optics that meet the necessities of higher photograph sensors, the fundamental features and function parameters of picture sensors, and exact discussions of either CCD and CMOS snapshot sensors. The publication then discusses how colour conception impacts the makes use of of DSCs, provides simple snapshot processing and digicam keep an eye on algorithms and examples of complex picture processing algorithms, explores the structure and required functionality of sign processing engines, and explains tips to evaluation photograph caliber for every part defined. The booklet closes with a glance at destiny applied sciences and the demanding situations that needs to be triumph over to gain them. With contributions from many energetic DSC specialists, picture Sensors and photo Processing for electronic nonetheless Cameras deals extraordinary real-world insurance and opens large the door for destiny innovation.
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Additional resources for Image sensors and signal processing for digital still cameras
Example text
1 SAMPLE DESIGN PROCESS We begin by describing an ordinary design process, which is not limited specifically to imaging optics for DSCs. 13 shows a typical optical system design process. • • • • The first step is to formulate the target design specifications, as well as optical specifications, such as the focal length, F-number, and zoom ratio. This includes physical specifications such as the optical performance targets and the total length and diameter. Next, we select the lens type. 4, because the optimum lens type differs depending on the specifications, efficient lens design requires that a number of lens configurations suited to the specifications be selected in advance.
11 shows the MTF for an ideal lens with a circular aperture; however, the effects of diffraction also vary slightly depending on the shape of the aperture. 8 lens with a circular, rectangular (square), and diamond-shaped aperture. , using an apodization filter or “super resolution”). 8 lens with some aperture shape. 3 IMPORTANT ASPECTS OF IMAGING OPTICS DESIGN FOR DSCS In this section, the design process used for designing imaging optics for DSCs is discussed as well as the key issues that must be considered in that design process.
However, care is needed because they are susceptible to variations in temperature and humidity. Of these four, all but the first type are used in the compact DSCs currently on the market. However, with the increasingly tiny pixel pitches in imaging elements in recent years, demand for glass-molded aspherical lenses has increased enormously due to their excellent precision, reliability, and suitability for mass production. The problem with this is that the materials used in glass-molded lenses are special and often differ from those used in ordinary spherical lenses.