There are several gray scale charts available: 3,5,7,9,11,13 steps, linear/logarithmic, transparent/reflective, different sizes... So it seems to be difficult to choose the appropriate chart for your needs. But when following SOME RULES it gets much easier to find the right chart.
The resolution measurement with sinusoidal Siemens stars is applicable to all digital cameras and done within minutes.
The resolution measurement with sinusoidal Siemens stars is applicable to all digital cameras and done within minutes.
One of the most important artificial light sources is a tungsten filament lamp. When heated to a certain temperature, which depends on the resistance of the filament and the applied voltage, it emits light. The color of this light is closely related to the filament’s temperature. Although a tungsten lamp is not a black-body or Planckian radiator, their emitted relative spectral power distributions (SPDs) are very identical.
One very important parameter for testing a digital imaging device is the resolution*. But there are different ways to express the resolution of a digital camera which are sometimes confusing. Here are the most common units.
That a digital camera is able to capture color images is normally nothing worth mentioning. But the color processing in the camera is a very complex topic and nothing trivial.
To receive accurate and repeatable results it is important to check the accuracy of your test chart illumination. Such an illumination needs to fulfill 3 main criteria:
Produced according to your needs
A test chart it needs to fulfill certain requirements depending on the application. These requirements are defined by the camera/scanner system, the typical use-cases for the camera, the size of your lab, and the purpose of the target itself.
The color module of the iQ-Analyzer is very useful to check the color reproduction quality of an imaging device. So read the color information from the image or video data and compare this to the stored reference data. But you can go one step further and use the module to compare two cameras, different settings or the influence of different light sources..
The SFR-Edge algorithm uses a slanted edge to perform the measurement of the spatial frequency response. One very important step in this calculation is the generation of the edge spread function. And to generate this function, the location of the edge in the image is a very important information.
