SonarTRX 12.1 has a new Beam Angle Correction feature (BAC) useful for ballancing out the brightness and contrast of the slant range corrected images. To illustrate some of SonarTRX's basic image correction and BAC, here are some images recorded from a kayak, in an area of water depth 15 feet The track-distance of each image is about 200'.

Example 1: Images that includes the water column (i.e. No Slant Range Correction)

The image to the left is based on the original uncorrected data from the Humminbird recording and has a slightly lower contrast. The image to the right has been corrected to maximize contrast, but no adjustment has been made for the weaker signal from large beam angles.

Standard images with water column - with or without basic correction.

 

Example 2: Slant Range Corrected (SRC) images.

The image to the left is corrected to maximize contrast. There is a large drop in brightness at higher beam angles. The image to the right has undergone Beam Angle Correction to even out the brightness and bring out additional details at far ranges. (A high contrast setting was selected to bring out as much detail as possible from the far ranges.)

Slant range corrected images - without and with Beam Angle Correction.

 

Close-up of example target on the seabed

The images below are close-up details of one of the targets in the corresponding SRC image above. The image to the left has a lower contrast and a slight drop in brightness from top to bottom. The image to the right (w/BAC) has a higher contrast and more even brightness top-to bottom of the image.

Closeup of Targets from SRC images - without and with BAC.