OpenCv imdecode returns none 用于 HEIC 文件

Question

我正在处理调整图像大小的应用程序。它可以很好地处理 jpg、png、jpeg 图像格式，但它不能像预期的那样处理 heic 文件。

错误： OpenCV(4.4.0) /tmp/pip-req-build-vu_aq9yd/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

代码片段

        npimg = np.frombuffer(stream.read(), np.uint8)
        img = cv2.cvtColor(cv2.imdecode(npimg, cv2.IMREAD_COLOR), cv2.COLOR_BGR2RGB)
        h, w = cls.get_dims(img, dpi)
        img = cv2.resize(img, (w, h), interpolation=cv2.INTER_AREA)
        return Image.fromarray(img).convert("RGB")

我发现的是：

cv2.imdecode(npimg, cv2.IMREAD_COLOR) returns none.

我不明白为什么它不能使用 heic 文件。这个问题的解决方案是什么？

注:

我已经浏览过之前的类似问题，但是 none 对我有用。

Answer 1

OpenCV 不支持 heic 文件。来自 OpenCV 文档：

Currently, the following file formats are supported:

    Windows bitmaps - *.bmp, *.dib (always supported)
    JPEG files - *.jpeg, *.jpg, *.jpe (see the Note section)
    JPEG 2000 files - *.jp2 (see the Note section)
    Portable Network Graphics - *.png (see the Note section)
    WebP - *.webp (see the Note section)
    Portable image format - *.pbm, *.pgm, *.ppm *.pxm, *.pnm (always supported)
    PFM files - *.pfm (see the Note section)
    Sun rasters - *.sr, *.ras (always supported)
    TIFF files - *.tiff, *.tif (see the Note section)
    OpenEXR Image files - *.exr (see the Note section)
    Radiance HDR - *.hdr, *.pic (always supported)
    Raster and Vector geospatial data supported by GDAL (see the Note section)

https://docs.opencv.org/4.5.4/d4/da8/group__imgcodecs.html

OpenCv imdecode returns none 用于 HEIC 文件

OpenCv imdecode returns none for HEIC file

python

opencv

heic