In-camera Video Contrast Enhancement To See Through the Fog

Posted by Gretchen Alper on Wed, Apr 27, 2011

Adimec’s Video Contrast Enhancement Module (VEM) automatically improves performance and accuracy in low contrast conditions.  This capability addresses a limitation in off-the-shelf CCD sensors which do not perform well in low contrast conditions.  It is especially useful in applications such as outdoor/defense (where environmental issues present challenges, particularly in long-range observation) and metrology/inspection (where low-contrast materials impede accuracy).

The VEM technology eliminates the effects of a hazy atmosphere due to fog and/or sunlight scattering. Using this technology gives you the capability to "see through fog". Even in diffused scenes where no details are visible a remarkably detailed picture is presented. In near dark applications the automatic gain control gives an acceptable picture far beyond normal CCD sensitivity.

The VEM automatically adjusts important aspects of contrast enhancement, such as gain control, exposure control and contour correction. It offers the user as much control as required, including allowing the user to define the active measurement window.

VEM works in conjunction with Automatic Gain Control (AGC) and Automatic Exposure Control (AEC) features to make the contrast of the image as high as possible.

VEM is part of True Accurate Imaging® technology.  This module is standard in several of our cameras and can be added to others when required.

Adimec contrast enhancement off

Figure 1: The scene without VEM

Adimec contrast enhancement before

Figure 2: The same scene automatic light control applied

Adimec contrast enhancement on

Figure 3.  The same scene with light control and contrast enhancement (VEM)

Click here to see the video of the images above.

Topics: Image Quality Improvements