I'm using gozxing(github.com/makiuchi-d/gozxing) and gozbar(github.com/MordFustang21/gozbar) to decode barcode, but it can not decode barcode on some images like below, 
// input is the file content, type is []byte
reader := oned.NewITFReader()
hints := make(map[gozxing.DecodeHintType]interface{})
hints[gozxing.DecodeHintType_TRY_HARDER] = true
r := bytes.NewReader(input)
img, _, err := image.Decode(r)
if err != nil {
return nil, errors.Wrap(err, "failed to decode image")
}
bmp, err := gozxing.NewBinaryBitmapFromImage(img)
if err != nil {
return nil, errors.Wrap(err, "failed to create bitmap from image")
}
res, err := reader.Decode(bmp, hints)
// At there, the err is NotFoundException
I have tried all the reader like codebar,code39... under the oned package, all of them will return NotFoundException
gozbar also will return no symbols found error