package util
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import (
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"basic.com/pubsub/protomsg.git"
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"gocv.io/x/gocv"
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"image"
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)
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// 按尺寸去切图
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func SubImg(i protomsg.Image, x0, y0, x1, y1 int, type1 string ) []byte {
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img, _ := gocv.NewMatFromBytes(int(i.Height), int(i.Width), gocv.MatTypeCV8UC3, i.Data)
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if type1 == "face" {
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rect := image.Rect(EnlargeSize(x0, y0, x1, y1, i))
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region := img.Region(rect)
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bytes, _ := gocv.IMEncode(".jpg", region)
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return bytes
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} else {
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rect := image.Rect(EnlargeSizeForCar(x0, y0, x1, y1, i))
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region := img.Region(rect)
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bytes, _ := gocv.IMEncode(".jpg", region)
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return bytes
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}
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}
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// 长宽变为一比一，每边各扩百分之20
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func EnlargeSize(x0, y0, x1, y1 int, i protomsg.Image) (x0_new, y0_new, x1_new, y1_new int) {
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// 先把长宽变为一比一
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chazhi := (y1 - y0) - (x1 - x0)
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x0 = x0 - chazhi/2
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if x0 < 0 {
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x0 = 0
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}
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x1 = x1 + chazhi/2
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if x1 > int(i.Width) {
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x1 = int(i.Width)
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}
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// 再把每边各扩大百分之20
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enlarge := float32(0.2)
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x0_new = int((1+enlarge)*float32(x0) - enlarge*float32(x1))
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if x0_new < 0 {
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x0_new = 0
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}
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x1_new = int((1+enlarge)*float32(x1) - enlarge*float32(x0))
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if x1_new > int(i.Width) {
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x1_new = int(i.Width)
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}
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y0_new = int((1+enlarge)*float32(y0) - enlarge*float32(y1))
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if y0_new < 0 {
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y0_new = 0
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}
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y1_new = int((1+enlarge)*float32(y1) - enlarge*float32(y0))
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if y1_new > int(i.Height) {
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y1_new = int(i.Height)
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}
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return
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}
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// 每边各扩百分之20
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func EnlargeSizeForCar(x0, y0, x1, y1 int, i protomsg.Image) (x0_new, y0_new, x1_new, y1_new int) {
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// 再把每边各扩大百分之20
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enlarge := float32(0.2)
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x0_new = int((1+enlarge)*float32(x0) - enlarge*float32(x1))
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if x0_new < 0 {
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x0_new = 0
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}
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x1_new = int((1+enlarge)*float32(x1) - enlarge*float32(x0))
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if x1_new > int(i.Width) {
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x1_new = int(i.Width)
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}
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y0_new = int((1+enlarge)*float32(y0) - enlarge*float32(y1))
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if y0_new < 0 {
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y0_new = 0
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}
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y1_new = int((1+enlarge)*float32(y1) - enlarge*float32(y0))
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if y1_new > int(i.Height) {
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y1_new = int(i.Height)
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}
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return
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}
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