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Image Filter Tester 1.1 - Predefined Fast 3×3 Filter
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The default pixel value is used when the processing window exceeds the image boundary.
These filters work for grayscale images or 24-bit color images.
This is actually a collection of 32 predefined 3×3 window-based filters including softening, noise reduction, sharpening, and edge detection:
| Name |
Description |
| Averaging (3×3) | Averaging filter for noise reduction. |
| Median (3×3) | Median filter for noise reduction. This filter tends to preserve the sharp edges in the image. |
| Gaussian (3×3) | Gaussian filter for noise reduction. |
| Laplacian - Edge Detection (3×3) | Laplacian filter for detecting all edges. |
| Laplacian - Sharpening (3×3) | Laplacian filter for image sharpening. This is equivalent to adding the output from a Laplacian filter (for edge detection) to the original image. |
| 0°-Prewitt | Prewitt filter for detecting edges with orientation of 0°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 45°-Prewitt | Prewitt filter for detecting edges with orientation of 45°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 90°-Prewitt | Prewitt filter for detecting edges with orientation of 90°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 135°-Prewitt | Prewitt filter for detecting edges with orientation of 135°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 180°-Prewitt | Prewitt filter for detecting edges with orientation of 180°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 225°-Prewitt | Prewitt filter for detecting edges with orientation of 225°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 270°-Prewitt | Prewitt filter for detecting edges with orientation of 270°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 315°-Prewitt | Prewitt filter for detecting edges with orientation of 315°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| Maximum Prewitt | Prewitt filter for detecting all edges. |
| 0°-Sobel | Sobel filter for detecting edges with orientation of 0°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 45°-Sobel | Sobel filter for detecting edges with orientation of 45°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 90°-Sobel | Sobel filter for detecting edges with orientation of 90°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 135°-Sobel | Sobel filter for detecting edges with orientation of 135°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 180°-Sobel | Sobel filter for detecting edges with orientation of 180°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 225°-Sobel | Sobel filter for detecting edges with orientation of 225°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 270°-Sobel | Sobel filter for detecting edges with orientation of 270°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 315°-Sobel | Sobel filter for detecting edges with orientation of 315°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| Maximum Sobel | Sobel filter for detecting all edges. |
| 0°-Kirsch | Kirsch filter for detecting edges with orientation of 0°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 45°-Kirsch | Kirsch filter for detecting edges with orientation of 45°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 90°-Kirsch | Kirsch filter for detecting edges with orientation of 90°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 135°-Kirsch | Kirsch filter for detecting edges with orientation of 135°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 180°-Kirsch | Kirsch filter for detecting edges with orientation of 180°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 225°-Kirsch | Kirsch filter for detecting edges with orientation of 225°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 270°-Kirsch | Kirsch filter for detecting edges with orientation of 270°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| 315°-Kirsch | Kirsch filter for detecting edges with orientation of 315°. Here the edge orientation is defined in such a way that the brighter pixels are at the right-hand side of the edge. |
| Maximum Kirsch | Kirsch filter for detecting all edges. |
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This page was last modified on 02/29/2004.