This section shows examples of how to use each type of filter.
- [Blur]
- Blur filter can be used to smooth out fine surface texture or image noise. Blur filter is very similar to Gaussian Blur filter. Blur filter is suitable to process the whole image, and Gaussian Blur filter is suitable to remove the noise of the image.
[Size]
As the filter size of Blur filter becomes larger, the image is blurred stronger.
- [Sharpen]
- Sharpen filter can be used to enhance the contrast of the edges in the image. As a filter similar to Sharpen filter, you can use Gaussian Sharpen filter. When you give priority to processing time, Sharpen filter is suitable. And when you want to use the filter many times, Gaussian Sharpen filter is suitable.
[Size]
As the filter size of Sharpen filter becomes larger, the outlines become sharper.
- [Erode]
- Erode filter can be used to expand the light areas and shrink the dark areas in the image.
[Iterations]
As the number of the iterations of Erode filter becomes larger, the dark areas in the image become smaller.
- [Dilate]
- Dilate filter is used to expand the dark areas and shrink the light areas in the image.
[Iterations]
As the number of the iterations of Dilate filter becomes larger, the dark areas in the image become larger.
- [Open]
- Open filter performs Dilate filter after Erode filter. Open filter can erase the small dark area.
[Iterations]
As the number of the iterations of Open filter becomes larger, the larger dark areas in the image can be erased.
- [Close]
- Close filter performs Dilate filter after Erode filter. Close filter can be used to erase light areas.
[Iterations]
As the number of the iterations of Close filter becomes larger, the larger light areas in the image can be erased.
- [Top Hat]
- Top Hat filter can be used to extract thin light lines and the small light holes of the image.
[Size]
As the filter size of Top Hat filter becomes larger, the bolder white lines in the image can be extracted.
- [Bottom Hat]
- Bottom Hat filter is used to extract thin dark lines and small dark holes.
[Size]
As the filter size of Bottom Hat filter becomes bigger, the bolder dark lines can be extracted.
- [Edge Magnitude]
- Edge Magnitude filter is used to output the image that shows difference from the results of Erode filter and Dilate filter. Edge Magnitude filter can be used to extract highlight edges of the image.
[Iterations]
As the number of the iterations of Edge Magnitude filter becomes larger, the highlight edges become bolder.
- [Median]
- Median filter output featured pixels and its neighborhood. Median filter can be used to remove image salt and pepper noise without affecting the edges in the image.
[Size]
As the filter size of Medial filter becomes bigger, noises can be removed strongly.
- [Gaussian Blur]
- Gaussian Blur filter can be used to smooth out the fine surface texture or the image noise. Gaussian Blur filter is very similar to Blur filter. Blur filter is suitable to process the whole image, and Gaussian Blur filter is suitable to remove the noise of the image.
[Size]
As the filter size of Gaussian Blur filter becomes bigger, the image can be blurred strongly.
- [Gaussian Sharpen]
- Gaussian Sharpen filter is used to emphasize the highlight edges by increasing the contrast of the input image. When you give priority to processing time, Sharpen filter is suitable. And when you want to use the filter many times, Gaussian Sharpen filter is suitable.
[Size]
As the filter size of Gaussian Sharpen filter becomes larger, the highlight edges are more emphasis.
- [Gaussian High Pass]
- Gaussian High Pass filter is used to extract a high frequency component of the image.
[Size]
As the filter size of Gaussian High Pass filter becomes larger, lower frequency component is erased and high frequency component is left.
- [Vertical Gradient]
- Vertical Gradient filter can be used to highlight horizontal edges and texture in the image.
[Size]
As the filter size of Vertical Gradient filter becomes larger, the smaller shade can be neglected and the bigger shade can be extracted.
- [Horizontal Gradient]
- Horizontal Gradient filter can be used to highlight vertical edges and texture in the image.
[Size]
As the filter size of Horizontal Gradient filter becomes larger, the smaller shade can be neglected and the bigger shade can be extracted.
- [Gradient Magnitude]
- Gradient Magnitude filter is used to output the magnitude of the shade gradient in images. Gradient Magnitude filter cannot designate the filter size or the number of the iterations.
- [Gradient Direction]
- Gradient Direction filter is used to output the direction of the shade gradient in images. Direction of the shade gradient that becomes dark as it goes down (downward) is assigned to 128. Shade gradient number 64 means left, and 192 means right. Upward shade gradient is assigned to near 0 and near 255. Gradient Direction filter cannot designate the filter size or the number of the iterations.
- [Negative]
- Negative filter can be used to reverse the light and shade to make dark areas bright and bright areas dark of Input Image. Negative filter cannot designate the filter size or the number of the iterations.
- [Contrast Equalization]
- Contrast Equalization filter adjusts the brightness of the entire image to certain value to make entirely dark image bright and bright image dark. Because the brightness gets a certain value, it can easily configure the threshold of the command tools. Contrast Equalization filter cannot designate the filter size or the number of the iterations.