공간 영역에서 영상 필터링 시작하기

공간 영역에서의 영상 필터링이란?

공간적으로 필터링된 영상에서 각 출력 픽셀의 값은 이웃 입력 픽셀들에 가중치를 적용한 합입니다. 가중치는 컨벌루션 커널 또는 필터라 불리는 행렬에 의해 제공됩니다.

Filter Grayscale and Truecolor (RGB) Images using imfilter Function

This example shows how to filter an image with a 5-by-5 averaging filter containing equal weights.

Filter Images Using Predefined Filters

This example shows how to create a type of special filter called an unsharp masking filter, which makes edges and detail in an image appear sharper.

imfilter Boundary Padding Options

When a portion of the convolution or correlation kernel extends past the edge of an image, you can extrapolate image values by zero-padding the image or by replicating boundary pixels.

잡음 제거 필터링

잡음 제거

잡음은 영상 수집 또는 영상 전송 중 획득한 픽셀 값의 랜덤 오차를 말합니다. 잡음을 제거하면 영상 품질이 개선될 수 있습니다.

영상에 가우스 스무딩 필터 적용하기

이 예제에서는 여러 강도의 가우스 스무딩 필터를 사용하여 영상을 블러 처리하는 방법을 보여줍니다. 이 예제에서는 등방성 및 비등방성 가우스 필터링을 모두 다룹니다.

Reduce Noise in Image Gradients

This example shows how to reduce noise associated with computing image gradients.

경계 보존 필터링

What is Guided Image Filtering?

Guided image filtering performs edge-preserving smoothing on an image. It uses the content of a second image, called a guidance image, to influence the filtering.

Perform Flash/No-flash Denoising with Guided Filter

This example shows how to reduce noise from an image while using a guidance image to preserve the sharpness of edges.

Segment Thermographic Image after Edge-Preserving Filtering

This example shows how to segment a hot object from the background in a thermographic image.

영상 속성별 필터링

Calculate Region Properties Using Image Region Analyzer

This example shows how to find the regions, and how to compute the region properties, of a binary image. You can sort the regions based on the properties.

Filter Images on Region Properties Using Image Region Analyzer App

This example shows how to filter a binary image based on properties, such as area and perimeter, of objects in the image.

적분 영상 영역 필터링

Integral Image

Integral images are a quick way to represent images for filtering. In an integral image, the value of each pixel is the summation of the pixels above and to the left of it.

Apply Multiple Filters to Integral Image

This example shows how to smooth an image by different amounts by applying box filters of varying sizes to the integral image.

주파수 영역 필터링

Design Linear Filters in the Frequency Domain

You can design filters that modify the frequency content of images. Filtering in the frequency domain is often faster than filtering in the spatial domain.