Rating – Contrast
The artwork below shows a more practical example of how to improve the local contrast of the target. We use an image with two layers. In the foreground are a few multi-colored leaves. The background is a textured surface. The layers exist only in our graphic editor; when uploading to the Target Manager, we always use a flattened image, e.g., PNG format. The uploaded image is 512x512 pixels in size, a little bigger than the recommended minimum of 320 pixels.
At first sight, the original image might have enough detail to function as a target. Unfortunately, uploading it to the Target Manager yields a very low rating of only one star. This results in poor tracking performance. Consecutive adjustments on the image improves the target quality to a five-star target, yielding superior detection and tracking performance.
- Background layer changed to a lighter color resulting in more features points.
- Foreground features adjusted with higher contrast and lower brightness.
- Local contrast enhancement applied to image.
- Reduce background to white.
- Strengthen contrast along edges.
The result is a five-star rating of the image that will track well and consistently. The contrast and features will be easily picked up and the placement of augmentations can be positioned at any position as the feature distribution is consistent. For guides and other improvements to the image, please refer to Image Targets Optimization Techniques.