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| package util
|
| import (
| "basic.com/pubsub/protomsg.git"
| "gocv.io/x/gocv"
| "image"
| )
|
| // 按尺寸去切图
| func SubImg(i protomsg.Image, x0, y0, x1, y1 int, ) []byte {
| img, _ := gocv.NewMatFromBytes(int(i.Height), int(i.Width), gocv.MatTypeCV8UC3, i.Data)
| rect := image.Rect(EnlargeSize(x0, y0, x1, y1, i))
| region := img.Region(rect)
| bytes, _ := gocv.IMEncode(".jpg", region)
| return bytes
| }
|
| // 长宽变为一比一，每边各扩百分之20
| func EnlargeSize(x0, y0, x1, y1 int, i protomsg.Image) (x0_new, y0_new, x1_new, y1_new int) {
| // 先把长宽变为一比一
| chazhi := (y1 - y0) - (x1 - x0)
| x0 = x0 - chazhi/2
| if x0 < 0 {
| x0 = 0
| }
| x1 = x1 + chazhi/2
| if x1 > int(i.Width) {
| x1 = int(i.Width)
| }
|
| // 再把每边各扩大百分之20
| enlarge := float32(0.2)
| x0_new = int((1+enlarge)*float32(x0) - enlarge*float32(x1))
| if x0_new < 0 {
| x0_new = 0
| }
| x1_new = int((1+enlarge)*float32(x1) - enlarge*float32(x0))
| if x1_new > int(i.Width) {
| x1_new = int(i.Width)
| }
| y0_new = int((1+enlarge)*float32(y0) - enlarge*float32(y1))
| if y0_new < 0 {
| y0_new = 0
| }
| y1_new = int((1+enlarge)*float32(y1) - enlarge*float32(y0))
| if y1_new > int(i.Height) {
| y1_new = int(i.Height)
| }
| return
| }
|
|
