我犯了最愚蠢的错误。但是，如果它可以帮助任何人，请更改

I made the most stupid mistake ever. However, if it may help anyone, change

for (int imgY = 0; imgY < b.GetUpperBound(1); ++imgY)

到

for (int imgY = 0; imgY <= b.GetUpperBound(1); ++imgY)

（< 应为< = ）。