Colmap closes starting dense reconstruction: "out of memory in C:/Users/jachoenh/Development/colmap"

[Gerardo Álvarez]

Using Colmap 2.1 dev with CUDA (*) on Windows 7 (**)

I have 603 pictures taken with a GoPro HERO4 of the inside of a theatre (jpgs, 4000*3000 pixels)

Automatic reconstruction seems to work OK,

I adjusted máximum image size to 4000 instead of the default 3200 and after succesfully extracting and matching features, I got a good looking sparse point cloud in two separate models.

I tried dense reconstruction, succesfully undistorted a set of 318 Images corresponding to the main model.

All the resulting undistorted images are 6395 x 3781 pixels

However when I get to Stereo stage, the program hangs after 2 minutes.

In the Log I see:

Reading configuration...

================================================

Processing View 1/319

================================================

Reading inputs...

It stays like that for a while, memory starts to fill and right before it closes:

PatchMatch::Problem

---------------------------------

ref_image_id: 238

src_image_ids: 157 160 (...) etc

PatchMatch::Options

================================================

gpu_index: 0

(...)

filter_geom_consistency_max_cost: 1

PatchMatch::Run

At this moment a message appears in the colmap.exe Console:

out of memory in C:/Users/jachoenh/Development/colmap/src/.\nvs\gpu_mat.h at line 151

And right after colmap closes, a last error for a fraction of a second before the Console closes too:

QObject::^QObject: Timers cannot be stopped from another thread

I tried the previous dev versión (Commit 308d5c1 on 2017 04 24 with CUDA) stable versión (COLMAP 2.1), in both cases RAM fills at a linear rate from 2 to almost 8 GB, stays flat, and then closes, taking about 8 minutes to hang.

Any ideas?

Best

(*) (Commit b2d00e1 on 2017-05-11 with CUDA)

(**) Windows 7 Ultimate SP 1 64 bits, Intel Core 2 Quad, 8 GB RAM, Geforce GTX 1060 6 GB, CUDA 8.0.0 driver (6.14.13.8205), Graphics Controller 382.05

[Johannes Schönberger]

Hi,

The error message says: "out of memory". Your GPU doesn't have enough memory to process these large images. To fix this, please refer to https://colmap.github.io/faq.html#reduce-memory-usage-during-dense-reconstruction

Let me know if this solves your problem.

Cheers,
Johannes

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[Gerardo Álvarez]

Hi,

Yep, it´s working now. Thanks!

[Oleksii Martens]

Reducing the number of source images did not help me. Did you reduce max_image_size?

To which extend did you reduced it if so? 

[Gerardo Álvarez]

I reduced it to 2000 pixels, down from GoPro´s 4000x300 native size.

Gerardo Álvarez

617 764 201

galva...@gmail.com

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