JPEGLossless Bugs: SOF3 P in [9,15] and DHT-before-SOF3 Streams
Đang mở
@jantonguirao đang làm issue này rồi.
Từ ngày 22/9/2026.
Đánh giá
- Độ khó
- 4/5
- Thời gian dự kiến
- 3-5 ngày
- Mức phù hợp với người mới
- 48/100
- Loại issue
- Lỗi
- Độ rõ ràng
- Đặc tả rõ ràng
- Mức độ hoạt động
- Ít trao đổi
- Công nghệ
- cpp
- Lĩnh vực
- computer-vision
Hướng nghiên cứu
Bắt đầu trong lossless_decoder.cpp và truy vết nvjpegDecodeBatchedSupported đối với các stream SOF3, sử dụng bad_sequence_frame.jpg, MR_frame.jpg và CT_frame.jpg làm các trường hợp được báo cáo. Xác minh rằng các stream không được hỗ trợ trả về trạng thái xử lý phù hợp thay vì tạo ra đầu ra bị điền bằng số 0 một cách im lặng; issue báo cáo rằng các bài kiểm thử đều đạt trong bản sửa được đề xuất, nhưng không nêu tên tệp kiểm thử.
Do mô hình lập chỉ mục viết ra từ nội dung của issue.
Mô tả
bug
Version
0.8.0
Describe the bug.
The nvjpeg lossless JPEG decoder (NVJPEG_BACKEND_LOSSLESS_JPEG) silently produces zero-filled output buffers for two classes of JPEG Lossless (SOF3) stream. nvjpegDecodeBatchedSupported incorrectly returns isSupported == 0 ("supported") for both, making the failures silent — no error is returned, the decode appears to succeed, but the output buffer contains only zeros.
These bugs were discovered when testing MAPs built using MONAI Deploy App SDK - CT and MR DICOM studies from Philips scanners were identified that produced zero-filled images that propagated silently through model inference, manifesting as empty segmentations. See PR on App SDK for additional background.
Expected behaviour: canDecode should return PROCESSING_STATUS_SAMPLE_TYPE_UNSUPPORTED or PROCESSING_STATUS_CODEC_UNSUPPORTED for these streams, allowing the framework to fall back to a capable CPU decoder (e.g. libjpeg-turbo) that handles them correctly.
Two independent bugs:
Bug 1 — Sub-16-bit SOF3 precision (P in [9,15]):
When the SOF3 P byte encodes a precision of 9–15 (e.g. a Philips scanner writing P=12 for a 12-bit series), nvjpegDecodeBatched silently zero-fills the output buffer. The GPU kernel appears to assume P=16 for all UINT16 lossless streams and misreads the Huffman-coded bitstream when P is smaller.
Bug 2 — DHT segment before SOF3:
When a DHT (0xFFC4) segment appears before the SOF3 marker (0xFFC3) — non-standard ordering that is technically valid per ITU-T T.81 Annex B, but emitted by some Philips scanners — nvjpegDecodeBatched fails to build decode tables correctly and silently zero-fills.
In both cases nvjpegDecodeBatchedSupported returns "supported", which is the core defect.
The issue is isolated to lossless_decoder.cpp / NVJPEG_BACKEND_LOSSLESS_JPEG. The baseline JPEG decoder (cuda_decoder.cpp) and the JPEG 2000 decoder (nvjpeg2k_ext) do not seem to be affected.
Minimum reproducible example
Three JPEG Lossless frames extracted from DICOM files reproduce the two bugs. All have BitsStored=12 in their DICOM tags but differ in JPEG stream encoding. Anonymized test frames and a proposed fix (with passing tests) are available in the linked PR (below).
| File | Manufacturer | SOF3 P byte | Segment order | Result |
|---|---|---|---|---|
bad_sequence_frame.jpg |
Siemens SOMATOM | 16 | SOI → SOF3(P=16) → DHT → SOS | ✅ Correct |
MR_frame.jpg |
Philips Ingenia | 12 | SOI → SOF3(P=12) → DHT → SOS | ❌ Silent zeros (Bug 1) |
CT_frame.jpg |
Philips iCT SP | 16 | SOI → COM → DHT → SOF3(P=16) → SOS | ❌ Silent zeros (Bug 2) |
Environment details
$ ./tools/print_env.sh
<details><summary>Click here to see environment details</summary><pre>
**git***
commit 36b4ee8c91de66070a09fa08fa1abbdc1a89144f (HEAD -> bl/jpeglossless_DHT_bugfix, origin/main, origin/HEAD, main)
Merge: 89500f3 3a7ac73
Author: Sebastian Matysik <[email protected]>
Date: Tue Apr 14 15:19:37 2026 +0200
Merge pull request #49 from NVIDIA/release_v0.8
Adding code for release v0.8.0 (commit 93bcb05)
**git submodules***
e170594ac7cf1dac584da473d4ca9301087090c1 external/NVTX (e170594)
cd1b1bd03900b68505822cfa25cb16851bd6caf1 external/boost/preprocessor (boost-1.89.0)
93c8f2a3c774b84af6f652b1992c48164fae60fc external/dlpack (93c8f2a)
52eb8108c5bdec04579160ae17225d66034bd723 external/googletest (52eb810)
f5fbe867d2d26e4a0a9177a51f6e568868ad3dc8 external/pybind11 (f5fbe86)
***OS Information***
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Ubuntu 22.04.5 LTS"
PRETTY_NAME="Ubuntu 22.04.5 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.5 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy
Linux EW22-04661 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11 04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
***GPU Information***
Wed May 6 13:47:59 2026
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 575.64.04 Driver Version: 577.00 CUDA Version: 12.9 |
|-----------------------------------------+------------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+========================+======================|
| 0 NVIDIA GeForce RTX 3090 On | 00000000:01:00.0 Off | N/A |
| 0% 42C P8 18W / 350W | 1335MiB / 24576MiB | 6% Default |
| | | N/A |
+-----------------------------------------+------------------------+----------------------+
+-----------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=========================================================================================|
| No running processes found |
+-----------------------------------------------------------------------------------------+
***CPU***
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 39 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 16
On-line CPU(s) list: 0-15
Vendor ID: GenuineIntel
Model name: 11th Gen Intel(R) Core(TM) i7-11700 @ 2.50GHz
CPU family: 6
Model: 167
Thread(s) per core: 2
Core(s) per socket: 8
Socket(s): 1
Stepping: 1
BogoMIPS: 4991.99
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl xtopology tsc_reliable nonstop_tsc cpuid pni pclmulqdq vmx ssse3 fma cx16 pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid avx512f avx512dq rdseed adx smap avx512ifma clflushopt avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves avx512vbmi umip avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid fsrm md_clear flush_l1d arch_capabilities
Virtualization: VT-x
Hypervisor vendor: Microsoft
Virtualization type: full
L1d cache: 384 KiB (8 instances)
L1i cache: 256 KiB (8 instances)
L2 cache: 4 MiB (8 instances)
L3 cache: 16 MiB (1 instance)
Vulnerability Gather data sampling: Unknown: Dependent on hypervisor status
Vulnerability Itlb multihit: Not affected
Vulnerability L1tf: Not affected
Vulnerability Mds: Not affected
Vulnerability Meltdown: Not affected
Vulnerability Mmio stale data: Vulnerable: Clear CPU buffers attempted, no microcode; SMT Host state unknown
Vulnerability Retbleed: Mitigation; Enhanced IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; Enhanced IBRS, IBPB conditional, RSB filling, PBRSB-eIBRS SW sequence
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Not affected
***CMake***
/usr/bin/cmake
cmake: /home/bluna301/miniconda3/envs/nvimgcodec/lib/libcurl.so.4: no version information available (required by cmake)
cmake version 3.22.1
CMake suite maintained and supported by Kitware (kitware.com/cmake).
***g++***
/usr/bin/g++
g++ (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
***nvcc***
/usr/local/cuda/bin/nvcc
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2024 NVIDIA Corporation
Built on Thu_Jun__6_02:18:23_PDT_2024
Cuda compilation tools, release 12.5, V12.5.82
Build cuda_12.5.r12.5/compiler.34385749_0
***Python***
/home/bluna301/miniconda3/envs/nvimgcodec/bin/python
Python 3.10.20
***Environment Variables***
PATH : /usr/local/cuda/bin:/home/bluna301/.vscode-server/data/User/globalStorage/github.copilot-chat/debugCommand:/home/bluna301/.vscode-server/data/User/globalStorage/github.copilot-chat/copilotCli:/home/bluna301/.vscode-server/bin/10c8e557c8b9f9ed0a87f61f1c9a44bde731c409/bin/remote-cli:/home/bluna301/.local/bin:/home/bluna301/miniconda3/envs/nvimgcodec/bin:/home/bluna301/miniconda3/condabin:/usr/local/cuda/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/lib/wsl/lib:/mnt/c/Program
Files/NVIDIA : GPU
Computing : Toolkit/CUDA/v12.0/bin:/mnt/c/Program
Files/NVIDIA : GPU
Computing : Toolkit/CUDA/v12.0/libnvvp:/mnt/c/Program
Files : (x86)/Common
Files/Oracle/Java/javapath:/mnt/c/ProgramData/Oracle/Java/javapath:/mnt/c/WINDOWS/system32:/mnt/c/WINDOWS:/mnt/c/WINDOWS/System32/Wbem:/mnt/c/WINDOWS/System32/WindowsPowerShell/v1.0:/mnt/c/WINDOWS/System32/OpenSSH:/mnt/c/PROGRA~2/CMWeb/bin:/mnt/c/Program: Files/MATLAB/MATLAB
Compiler : Runtime/v84/runtime/win64:/mnt/c/Users/mahfq2/AppData/Local/Programs/Python/Python310:/mnt/c/Users/mahfq2/AppData/Local/pip:/mnt/c/Users/mahfq2/AppData/Local/Programs/Python/Python310/Scripts:/mnt/c/Program
Files/Plastimatch/bin:/mnt/c/Program: Files/Plastimatch:/mnt/c/Program
Files/NVIDIA : Corporation/Nsight
Compute : 2022.4.0:/mnt/c/Program
Files : (x86)/NVIDIA
Corporation/PhysX/Common:/mnt/c/Program: Files/NVIDIA
Corporation/NVIDIA : NvDLISR:/mnt/c/Program
Files/Git/cmd:/mnt/c/Program : Files/dotnet:/Docker/host/bin:/mnt/c/Users/LUNPB9/AppData/Local/anaconda3:/mnt/c/Users/LUNPB9/AppData/Local/anaconda3/Library/mingw-w64/bin:/mnt/c/Users/LUNPB9/AppData/Local/anaconda3/Library/usr/bin:/mnt/c/Users/LUNPB9/AppData/Local/anaconda3/Library/bin:/mnt/c/Users/LUNPB9/AppData/Local/anaconda3/Scripts:/mnt/c/Users/LUNPB9/AppData/Local/Programs/Python/Python312/Scripts:/mnt/c/Users/LUNPB9/AppData/Local/Programs/Python/Python312:/mnt/c/Users/LUNPB9/AppData/Local/Microsoft/WindowsApps:/mnt/c/Users/LUNPB9/AppData/Local/Programs/Microsoft
VS : Code/bin:/snap/bin:/home/bluna301/.vscode-server/extensions/ms-python.debugpy-2026.6.0-linux-x64/bundled/scripts/noConfigScripts
LD_LIBRARY_PATH : /home/bluna301/miniconda3/envs/nvimgcodec/lib/python3.10/site-packages/nvidia/libnvcomp/lib64:/home/bluna301/miniconda3/envs/nvimgcodec/lib/python3.10/site-packages/nvidia/nvjpeg2k/lib:/home/bluna301/miniconda3/envs/nvimgcodec/lib/python3.10/site-packages/nvidia/nvtiff/lib:/home/bluna301/miniconda3/envs/nvimgcodec/lib:/usr/lib/llvm-14/lib:/usr/local/cuda/lib64:/home/bluna301/nvImageCodec/build_feature/bin/lib64:/home/bluna301/nvImageCodec/build_feature/bin/lib:/home/bluna301/nvImageCodec/build_feature/src:/home/bluna301/nvImageCodec/build_feature/extensions/nvjpeg:/home/bluna301/nvImageCodec/build_feature/extensions/nvjpeg2k:/home/bluna301/nvImageCodec/build_feature/extensions/nvtiff:/home/bluna301/nvImageCodec/build_feature/extensions/opencv:/home/bluna301/nvImageCodec/build_feature/extensions/nvbmp:/home/bluna301/nvImageCodec/build_feature/extensions/nvpnm:/home/bluna301/nvImageCodec/build_feature/extensions/libjpeg_turbo:/home/bluna301/nvImageCodec/build_feature/extensions/libtiff
NUMBAPRO_NVVM :
NUMBAPRO_LIBDEVICE :
CONDA_PREFIX : /home/bluna301/miniconda3/envs/nvimgcodec
PYTHON_PATH :
***conda packages***
/home/bluna301/miniconda3/condabin/conda
# packages in environment at /home/bluna301/miniconda3/envs/nvimgcodec:
#
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libstdcxx 15.2.0 h934c35e_18 conda-forge
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libstdcxx-ng 15.2.0 hdf11a46_18 conda-forge
libsystemd0 260.1 h6569c3e_0 conda-forge
libtiff 4.7.1 h9d88235_1 conda-forge
libudev1 260.1 h6569c3e_0 conda-forge
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liburing 2.14 hb700be7_0 conda-forge
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libvulkan-loader 1.4.341.0 h5279c79_0 conda-forge
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libxcb 1.17.0 h8a09558_0 conda-forge
libxcrypt 4.4.36 hd590300_1 conda-forge
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libxml2 2.15.3 h49c6c72_0 conda-forge
libxml2-16 2.15.3 hca6bf5a_0 conda-forge
libzlib 1.3.2 h25fd6f3_2 conda-forge
markupsafe 3.0.3 py310h3406613_1 conda-forge
mccabe 0.7.0 pyhd8ed1ab_1 conda-forge
mpg123 1.32.9 hc50e24c_0 conda-forge
ncurses 6.6 hdb14827_0 conda-forge
numpy 2.2.5 py310h35d6838_3
numpy-base 2.2.5 py310h4bc27c9_3
nvidia-libnvcomp-cu12 5.2.0.13 pypi_0 pypi
nvidia-nvjpeg2k-cu12 0.10.0.49 pypi_0 pypi
nvidia-nvtiff-cu12 0.7.0.79 pypi_0 pypi
ocl-icd 2.3.3 hb9d3cd8_0 conda-forge
opencl-headers 2025.06.13 hecca717_0 conda-forge
opencv 4.13.0 qt6_py310h1a5f3ab_608 conda-forge
openexr 3.4.11 h9f1635d_0 conda-forge
openh264 2.6.0 hc22cd8d_0 conda-forge
openjpeg 2.5.4 h55fea9a_0 conda-forge
openjph 0.27.0 h8d634f6_0 conda-forge
openldap 2.6.13 hbde042b_0 conda-forge
openssl 3.6.2 h35e630c_0 conda-forge
packaging 26.2 pyhc364b38_0 conda-forge
pango 1.56.4 hda50119_1 conda-forge
pcre2 10.47 haa7fec5_0 conda-forge
pillow 12.2.0 pypi_0 pypi
pip 26.1.1 pyh8b19718_0 conda-forge
pixman 0.46.4 h54a6638_1 conda-forge
pkg-config 0.29.2 h4bc722e_1009 conda-forge
pluggy 1.6.0 pypi_0 pypi
pthread-stubs 0.4 hb9d3cd8_1002 conda-forge
pugixml 1.15 h3f63f65_0 conda-forge
pulseaudio-client 17.0 h9a6aba3_3 conda-forge
py-opencv 4.13.0 qt6_py310h510e9db_608 conda-forge
pycodestyle 2.14.0 pyhd8ed1ab_0 conda-forge
pydicom 3.0.2 pypi_0 pypi
pyflakes 3.4.0 pyhd8ed1ab_0 conda-forge
pygments 2.20.0 pyhd8ed1ab_0 conda-forge
pylibjpeg 2.1.0 pypi_0 pypi
pylibjpeg-libjpeg 2.4.0 pypi_0 pypi
pylibjpeg-openjpeg 2.5.0 pypi_0 pypi
pysocks 1.7.1 pyha55dd90_7 conda-forge
pytest 9.0.3 pypi_0 pypi
python 3.10.20 h3c07f61_0_cpython conda-forge
python-clang 14.0.6 default_hccd1708_1 conda-forge
python_abi 3.10 8_cp310 conda-forge
qt6-main 6.11.0 pl5321h16c4a6b_4 conda-forge
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readline 8.3 h853b02a_0 conda-forge
requests 2.33.1 pyhcf101f3_1 conda-forge
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sdl2 2.32.56 h54a6638_0 conda-forge
sdl3 3.4.8 hdeec2a5_0 conda-forge
setuptools 82.0.1 pyh332efcf_0 conda-forge
shaderc 2026.2 h718be3e_0 conda-forge
snappy 1.2.2 h03e3b7b_1 conda-forge
snowballstemmer 3.0.1 pyhd8ed1ab_0 conda-forge
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sphinxcontrib-devhelp 1.0.2 py_0 conda-forge
sphinxcontrib-htmlhelp 2.0.1 pyhd8ed1ab_0 conda-forge
sphinxcontrib-jquery 4.1 pyhd8ed1ab_1 conda-forge
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sphinxcontrib-qthelp 1.0.3 py_0 conda-forge
sphinxcontrib-serializinghtml 1.1.5 pyhd8ed1ab_2 conda-forge
spirv-tools 2026.1 hb700be7_0 conda-forge
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tbb 2023.0.0 h51de99f_1 conda-forge
tk 8.6.13 noxft_h366c992_103 conda-forge
tomli 2.4.1 pypi_0 pypi
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tzdata 2025c hc9c84f9_1 conda-forge
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wayland-protocols 1.47 hd8ed1ab_0 conda-forge
wheel 0.47.0 pyhd8ed1ab_0 conda-forge
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xorg-xorgproto 2025.1 hb03c661_0 conda-forge
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zlib 1.3.2 h25fd6f3_2 conda-forge
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</pre></details>
Relevant log output
I created a script that attempts to use nvImageCodec, GDCM, and decoder_nvimgcodec.py (attempts to use nvImageCodec decoders first before falling back to any others present, like GDCM) to handle these compressed DICOM cases, and then compares GDCM to decoder_nvimgcodec outputs. Results for 3 files of interest shown below:
bad_sequence.dcm (no issues):
File : bad_sequence.dcm
TS=1.2.840.10008.1.2.4.70 BitsAllocated=16 BitsStored=12
[nvimgcodec decoder] decoded shape=(512, 512, 1) dtype=uint16 all_zero=False
[gdcm decoder ] decoded shape=(512, 512) dtype=uint16 all_zero=False
[decoder pipeline ] decoded shape=(512, 512) dtype=uint16 all_zero=False [via nvimgcodec]
[comparison ] MATCH (decoder pipeline pixel-identical to GDCM)
MR (SOF3 P = 12):
File : MR.dcm
TS=1.2.840.10008.1.2.4.70 BitsAllocated=16 BitsStored=12
[nvimgcodec decoder] decoded shape=(320, 320, 1) dtype=uint16 all_zero=True <-- SILENT ZERO-FILL BUG
[gdcm decoder ] decoded shape=(320, 320) dtype=uint16 all_zero=False
[decoder pipeline ] decoded shape=(320, 320) dtype=uint16 all_zero=True [via nvimgcodec] <-- ALL ZERO
[comparison ] MISMATCH <-- PIXEL CORRUPTION max_diff=1092 mean_diff=75.5825
CT (DHT before SOF3):
File : CT.dcm
TS=1.2.840.10008.1.2.4.70 BitsAllocated=16 BitsStored=12
[nvimgcodec decoder] decoded shape=(512, 512, 1) dtype=uint16 all_zero=True <-- SILENT ZERO-FILL BUG
[gdcm decoder ] decoded shape=(512, 512) dtype=uint16 all_zero=False
[decoder pipeline ] decoded shape=(512, 512) dtype=uint16 all_zero=True [via nvimgcodec] <-- ALL ZERO
[comparison ] MISMATCH <-- PIXEL CORRUPTION max_diff=2540 mean_diff=467.2943
Other/Misc.
A fix is implemented in extensions/nvjpeg/lossless_decoder.cpp in canDecode, adding:
- A precision check using
cs_image_info.plane_info[0].precision(the SOF3 P byte read by the nvimgcodec JPEG parser) to reject P in [9,15] - A
has_dht_before_sof3()pre-scan of the raw bitstream before callingnvjpegJpegStreamParseto reject DHT-before-SOF3 streams
The three aforementioned anonymized DICOM files were converted to .jpeg and used for testing - test/extensions/nvjpeg_ext_lossless_decoder_test.cpp was updated to include these new tests.
References:
- ITU-T T.81 (ISO/IEC 10918-1), Annex B — JPEG interchange format syntax
- MONAI Deploy App SDK PR
Check for duplicates
- I have searched the open bugs/issues and have found no duplicates for this bug report
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