the error: vips_tbmerge: too much overlap #4402

zjian361 · 2025-02-28T08:07:25Z

zjian361
Feb 28, 2025

I am using the merge function from libvips to stitch 7 columns × 6 rows of same-sized images into one large image, with some overlapping areas between them. However, I encountered the error: vips_tbmerge: too much overlap. Could you help me analyze and resolve this issue? Additionally, it would be great if you could explain in detail how to properly use the parameters of the merge interface. Thank you!

zjian361 · 2025-02-28T08:08:47Z

zjian361
Feb 28, 2025
Author

/**
 * Merge two images.
 *
 * **Optional parameters**
 *   - **mblend** -- Maximum blend size, int.
 *
 * @param sec Secondary image.
 * @param direction Horizontal or vertical merge.
 * @param dx Horizontal displacement from sec to ref.
 * @param dy Vertical displacement from sec to ref.
 * @param options Set of options.
 * @return Output image.
 */
VImage merge(VImage sec, VipsDirection direction, int dx, int dy, VOption *options = nullptr) const;

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zjian361 · 2025-02-28T08:17:31Z

zjian361
Feb 28, 2025
Author

row 0 col: 1
before merge w1: 2428 h1: 2028 dx: -2377 dy: -20 after merge w2: 4805 h2: 2048
row 0 col: 2
before merge w1: 4805 h1: 2048 dx: -4754 dy: -15 after merge w2: 7182 h2: 2048
row 0 col: 3
before merge w1: 7182 h1: 2048 dx: -7131 dy: -10 after merge w2: 9559 h2: 2048
row 0 col: 4
before merge w1: 9559 h1: 2048 dx: -9508 dy: -5 after merge w2: 11936 h2: 2048
row 0 col: 5
before merge w1: 11936 h1: 2048 dx: -11885 dy: 0 after merge w2: 14313 h2: 2048
row 1 col: 0
before merge w1: 14313 h1: 2048 dx: -4 dy: -2012 after merge w2: 14313 h2: 4040
row 1 col: 1
before merge w1: 14313 h1: 4040 dx: -2381 dy: -2007 then I encountered the error: vips_tbmerge: too much overlap.All of the small images have a width of 2428 and a height of 2028.

0 replies

jcupitt · 2025-02-28T15:52:18Z

jcupitt
Feb 28, 2025
Maintainer

Hello @zjian361,

The docs are here:

https://www.libvips.org/API/current/libvips-mosaicing.html#vips-merge

You'd need to post some sample images and code before I could tell you what's wrong in detail.

0 replies

jcupitt · 2025-02-28T15:52:56Z

jcupitt
Feb 28, 2025
Maintainer

nip4 comes with a mosaicing demo, I don't know if you saw:

https://github.com/jcupitt/nip4

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the error: vips_tbmerge: too much overlap #4402

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zjian361 Feb 28, 2025

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