[OpenCV] Chapter01-02 Transform image size and flip

Transform image size and flip

Source Code

package main

import (
 "image"
 "log"

 "gocv.io/x/gocv"
)

func main() {
 imageFilePath := "../../data/Lena.png"
 mat := gocv.IMRead(imageFilePath, gocv.IMReadAnyColor)
 if mat.Empty() {
  log.Panic("Can not read Image file : ", imageFilePath)
  return
 }

 log.Println("original image size:", mat.Size())

 width, height := 0.25, 0.5

 resizeImage := gocv.NewMat()
 gocv.Resize(mat, &resizeImage, image.Point{X: 0, Y: 0}, width, height, gocv.InterpolationNearestNeighbor)
 log.Println("original image size:", resizeImage.Size())

 flippedImage := gocv.NewMat()
 // Flip flips a 2D array around horizontal(0), vertical(1), or both axes(-1)
 // Reverses with respect to the x axis.
 gocv.Flip(mat, &flippedImage, 0)
 // Reverses with respect to the y axis.
 gocv.Flip(mat, &flippedImage, 1)
 // Reverses with respect to the both x, y axis.
 gocv.Flip(mat, &flippedImage, -1)
}

Execute Result

$ go run chapter01-02_transform_image_size_and_flip.go 

2019/03/06 23:24:55 original image size: [512 512]

2019/03/06 23:24:55 original image size: [256 128]