前处理后图像发生部分列像素从右侧边界位移到左侧边界

[neptune4year]

平台(如果交叉编译请再附上交叉编译目标平台):

Platform(Include target platform as well if cross-compiling):

Android

Github版本: 2.2

编译方式: cmake build

Compiling Method

前处理过程：将相机图片转换为垂直，并转为RGB，长边等比例居中缩放到256，短边两侧补0
代码：
int _size = 256;
int w = 720;
int h = 1280;
int rotation = 0;
const float means[3] = {103.53f, 116.535f, 122.40f};
const float normals[3] = {0.01743f, 0.01751f, 0.01712f};
auto pretreat = std::shared_ptrMNN::CV::ImageProcess(
MNN::CV::ImageProcess::create(MNN::CV::RGBA, MNN::CV::RGB, means, 3, normals, 3));
auto fit = MNN::CV::Matrix::ScaleToFit::kCenter_ScaleToFit;
MNN::CV::Matrix matrix = MNN::CV::Matrix::MakeRectToRect(
MNN::CV::Rect::MakeIWH(w, h),MNN::CV::Rect::MakeIWH(_size, _size), fit);

matrix.postRotate(rotation, _size / 2, _size / 2);
if (0) {
matrix.postScale(1.0/_size, 1.0/_size);
matrix.postScale(-1.0, 1.0, 0.5, 0.0);
matrix.postScale(_size, _size);
}
matrix.invert(&matrix);
pretreat->setMatrix(matrix);
auto input = _net->getSessionInput(_session, nullptr);
pretreat->convert(pImage, w, h, 0, input);

输出结果：

正确结果应为：

麻烦帮忙查一下问题所在

[jxt1234]

原始图片也放上来吧

[neptune4year]

原始图片也放上来吧

[v0jiuqi]

hi, 我用你的代码转图片结果显示正常，代码提供给你
`auto angle = 0;
int destSize = 256;
int width = 720, height = 1280;
auto fit = Matrix::ScaleToFit::kCenter_ScaleToFit;

MNN_PRINT("size: %d, %d\n", width, height);
Matrix trans;
trans = MNN::CV::Matrix::MakeRectToRect(
MNN::CV::Rect::MakeIWH(width, height),MNN::CV::Rect::MakeIWH(destSize, destSize), fit);

trans.postRotate(angle, destSize / 2, destSize / 2);
trans.invert(&trans);

CV::ImageProcess::Config _config;
_config.sourceFormat = CV::RGBA;
_config.destFormat   = CV::RGB;
_config.filterType   = CV::NEAREST;
_config.wrap         = CV::ZERO;

std::shared_ptr<ImageProcess> pretreat(ImageProcess::create(_config));
pretreat->setMatrix(trans);
{
    std::shared_ptr<Tensor> wrapTensor(ImageProcess::createImageTensor<uint8_t>(destSize, destSize, 3, nullptr));
    pretreat->convert((uint8_t*)inputImage, width, height, 0, wrapTensor.get());
    stbi_write_png(savePath destSize, destSize, 3, wrapTensor->host<uint8_t>(), 0);
}`

[v0jiuqi]

这是我转换的结果

[neptune4year]

感谢，我们找到问题所在了，MNN::CV::Rect::MakeIWH(width, height),MNN::CV::Rect::MakeIWH(destSize, destSize), fit);
这里的size好像需要-1，我们这里才能获得正确结果