Image Processing Reference
In-Depth Information
From low illumination
(minimum illuminance)
To high illumination
(maximum illuminance)
Dynamic range
With what level of accuracy?
SNR
FIGURE 1.3 (See color insert)
Example of the quality of light intensity information.
The accuracy and range of the four factors are shown in Table 1.1. The accuracy of space
information is space resolution, that of wavelength is color reproducibility, and that of
time is time resolution. The ranges of space,* wavelength, and time are the capturing
space range, the color gamut or wavelength range, and the storage time range,
†
respec-
tively. Apart from special applications and the dynamic range of intensity, these ranges
are rarely a problem.
In addition to intensity and wavelength, polarization and phase are among the light
conditions. Although these are not discussed in this topic, some examples deal with this
information, such as sensors to obtain the polarization distribution,
2
which concerns the
surface conditions of materials and textured surfaces, and sensors
3
and systems
4
to obtain
depth and range information using phase difference.
5
There is a sensor
6
that gets range
information from the angle information of incident light. Since there is a strong need for
information on range and depth, progress in this field is expected.
TABLE 1.1
Accuracy and Range of Four Factors
Factor
Accuracy (Resolution)
Range
Intensity
SNR (sensitivity)
Dynamic range
Space
Space resolution
Space range
Wavelength
Color reproducibility
Color gamut, wavelength range
Time
Time resolution
Storage time range
*
Although space is directly related to the sensor size, it can be extended by using a wide lens such as a fish-eye lens.
†
Storage memory size.
