OpenCV

OpenCV only works on the CPU In OpenCV the channel order is not RGB it is BGR.

Inputs and Outputs

We can find all the possible inputs for OpenCV in the Sources folder CvImage ImageReader VideoIn VideoPlayer VideoSourceToCVImage

And all the outputs in the Sink folder

Filters

Filters allow us to manipulate image sources. - Blur - Blur filter - Erode - Washes out an image - ApplyColorMap - Apply different color filters/aps. - Invert - Transform - Apply transformations scale, rotation, translate to image - GrayScale - Three channel data into one channel data - LUT- Create own color map from spread of colors.

Get specific Channel

To get a specific channel we can use GetChannel node.

Split/Join Image into Channels

The Split node allows us to retrieve the single channels of an image. Join nodes brings together a spread of image into one image.

Another way to get a channel is with the GetChannel node.

Convert into one channel image

The Grayscale node converts an image with multiple channels into a gray one channel image.

Get information from image

To get informations like width, height,channels and format we can use Info node.

Converting CVImage

To convert a opencv image into skia or stride we first need the opencv ToImage and then FromImage for Skia. And for Stride ImageToTexture.

Calculate Mean Color of Image

Mean node allows us to calculate the mean color of the whole image