For many global security systems, the optical format was determined early on by the choice of image sensor—typically either a 1/3" VGA sensor or larger HD CCD sensors such as those measuring 2/3" with pixel sizes ranging from 6 to 7 µm. These legacy systems are now being upgraded to leverage the superior performance of modern CMOS image sensors, which offer higher sensitivity, lower read noise, and better pixel throughput. However, simply reducing pixel size further could require a major system overhaul—potentially involving changes to optics or displays—which is often undesirable.

Adimec’s Adaptive Resolution™ Solution

There’s now a way for new cameras to integrate with existing optical systems and interfaces. For example, by replacing older VGA CCD sensors with advanced Quad HD CMOS image sensors on current VGA displays. Adimec’s proprietary Adaptive Resolution™ technology enables the emulation of legacy optical formats using programmable digital downscaling.

How Adaptive Resolution Works

This innovative approach allows system designers to select a new CMOS sensor without altering optics or sacrificing dynamic range. By utilizing advanced interpolation algorithms, it effectively creates virtual pixels that match the required image format. The result is identical field-of-view combined with enhanced performance due to the superior characteristics of modern CMOS sensors:

  • Higher sensitivity
  • Greater dynamic range
  • Improved MTF (especially for Bayer RGB color)

Real-World Validation

To demonstrate this, we compared two systems:

  1. Adimec’s TMX7-DHD camera using a CCD sensor with 4.54 µm square pixels.
  2. The TMX50 CMOS camera equipped with Sony’s IMX250 sensor (3.45 µm square pixels) running Adaptive Resolution to emulate the original pixel size.

Figure 1a: TMX7-DHD CCD Camera (4.54 um pixels)
Figure 1b: TMX50 CMOS (Adaptive Resolution emulating 4.54 um)

Upon closer inspection, even with zooming in on details like “Nieuw recept” lettering, the performance difference is evident without compromising overall image quality.

Figure 2: Side-by-side comparison of TMX7-DHD and TMX50

Last Updated: 2025-09-04 20:58:12