-215 opencv data_error ai_generated true

cv::error: (-215:Assertion failed) !buf.empty() && buf.data != NULL in function 'cv::imdecode'

ID: opencv/io-imdecode-corrupt-data

Also available as: JSON · Markdown · 中文
90%Fix Rate
87%Confidence
1Evidence
2024-05-18First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
4.7.0 active — — —
4.8.0 active — — —
4.9.0 active — — —

Root Cause

The input buffer to imdecode is empty or contains corrupt image data that cannot be decoded.

generic

中文

imdecode 的输入缓冲区为空或包含无法解码的损坏图像数据。

Official Documentation

https://docs.opencv.org/4.x/d4/da8/group__imgcodecs.html#ga26a67788faa58ade337f8d28ba0eb19e

Workarounds

  1. 95% success Validate the buffer before decoding: check that buf.size() > 0 and optionally check the first few bytes for a valid image signature (e.g., JPEG: 0xFF 0xD8, PNG: 0x89 0x50). Example in C++: if (buf.size() < 4 || buf[0] != 0xFF || buf[1] != 0xD8) { /* handle error */ }. 
    Validate the buffer before decoding: check that buf.size() > 0 and optionally check the first few bytes for a valid image signature (e.g., JPEG: 0xFF 0xD8, PNG: 0x89 0x50). Example in C++: if (buf.size() < 4 || buf[0] != 0xFF || buf[1] != 0xD8) { /* handle error */ }.
  2. 85% success If reading from a network stream, use a robust HTTP client that checks Content-Length and verifies the response body is complete before passing to imdecode. 
    If reading from a network stream, use a robust HTTP client that checks Content-Length and verifies the response body is complete before passing to imdecode.

中文步骤

  1. Validate the buffer before decoding: check that buf.size() > 0 and optionally check the first few bytes for a valid image signature (e.g., JPEG: 0xFF 0xD8, PNG: 0x89 0x50). Example in C++: if (buf.size() < 4 || buf[0] != 0xFF || buf[1] != 0xD8) { /* handle error */ }.
  2. If reading from a network stream, use a robust HTTP client that checks Content-Length and verifies the response body is complete before passing to imdecode.

Dead Ends

Common approaches that don't work:

  1. Attempting to decode a buffer read from a file that was truncated mid-write 90% fail

    Truncated data is still non-empty but corrupt; imdecode will fail silently or with assertion error.

  2. Passing a buffer that was decoded from base64 without proper validation 85% fail

    Base64 decoding may produce empty or invalid binary data if the input string is malformed.