Multiple Bug found in Colmap 3.13.0 and Colmap 4.1.0

Describe the bug

1. colmap global_mapper (version 4.1.0) produces Mean reprojection error: 0.000000px, Mean observations per image: 0.000000, and Mean track length: 0.000000 when using colmap feature_extractor --ImageReader.camera_model FULL_OPENCV --ImageReader.single_camera_per_image 1 & colmap feature_extractor --ImageReader.camera_model EUCM --ImageReader.single_camera_per_image 1

2. colmap mapper (version 3.13.0 and 4.1.0, ceres backend) gets difficulty detecting all images when using colmap feature_extractor --ImageReader.camera_model FULL_OPENCV --ImageReader.single_camera_per_image 1. It detected all images if I change it into OPENCV

3. colmap mapper (version 4.1.0, ceres backend) gets difficulty detecting all images when using colmap feature_extractor --ImageReader.camera_model EUCM --ImageReader.single_camera_per_image 1. It detected all images if I change it into OPENCV

4. colmap stereo_fusion (both 4.1.0 and 3.13.0) does not detect images

To Reproduce See my uploaded HTML. I run it through Jupyter Notebook. Dataset used: The first of 20 images of south-building.

Colmap_CLI_410_PerImg_EUCM.html Colmap_CLI_410_PerImg_FullCV2.html Colmap_CLI_410_PerImg_OpenCV.html Colmap_CLI_410_PerImg_SimpleRad.html Colmap_CLI_3130_Auto_SimpRad.html Colmap_CLI_3130_PerImg_FullCV2.html Colmap_CLI_3130_PerImg_OpenCV.html Colmap_CLI_3130_PerImg_SimpRad.html

Expected behavior

1. The colmap global_mapper does not produce Mean reprojection error: 0.000000px when using FULL_OPENCV & EUCM

2. Colmap ceres (Full_OpenCV & EUCM) should detect all images

3. It detects images when running colmap stereo_fusion

Environment:

• Ubuntu 22.04.5 LTS
• COLMAP 3.13.0 (Commit 0b31f981 on 2025-11-07 with CUDA)
• COLMAP 4.1.0 (Commit fa8e3b3f on 2026-06-26 with CUDA)