How to superimpose an image on another image (in the center)?

Question

go

Hey!

There was a task to superimpose one image on the second using gocv.
The difficulty is that you need to calculate the center "background" of the image.
What am I doing now:

bgImg := gocv.IMRead("bg.jpg", gocv.IMReadColor)
inputImg := gocv.IMRead("input.jpg", gocv.IMReadColor)

bgHalfWidth := bgImg.Cols() / 2
bgHalfHeight := bgImg.Rows() / 2
imgHalfWidth := inputImg.Cols() / 2
imgHalfHeight := inputImg.Rows() / 2

minX := bgHalfWidth - imgHalfWidth
minY := bgHalfHeight - imgHalfHeight
maxX := bgHalfWidth + imgHalfWidth
maxY := bgHalfHeight + imgHalfHeight

rect := image.Rect(minX, minY, maxX, maxY)
roi := bgImg.Region(rect)
gocv.AddWeighted(roi, 0.0, bgImg, 1.0, 0.0, &roi)

Assume that the input background image has the following dimensions 1024x682 and the image to be overlaid is 512x341. For this case, we get:
minx, miny, maxx, maxy equal to 256, 171, 768, 511, but the correct ones are 256, 171, 768, 512.
Of course, the problem is in bisection and calculation, but alas, I can’t understand how I get rid of it. At some point, you need to shift or expand some image? Perhaps I just chose not the most successful approach to calculating minx, miny, maxx, maxy?

I'd love to hear any advice!

Answer 1

rect := image.Rect(minX, minY, maxX, maxY)
replace with
rect := image.Rect(minX, minY, minX+inputImg.Cols(), minY+inputImg.Rows())
or the same in maxX calculation /Y