# Vegetation areas - blurry images

**URL:** <https://community.pix4d.com/t/vegetation-areas-blurry-images/5219>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [June 9, 2016, 5:09pm UTC](https://community.pix4d.com/t/vegetation-areas-blurry-images/5219 "2016-06-09T17:09:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![terraDrone\_PT](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/terradrone_pt/32/2323_2.png) [@terraDrone\_PT](https://community.pix4d.com/u/terraDrone_PT)\
**Post date:** [June 9, 2016, 5:09pm UTC](https://community.pix4d.com/t/vegetation-areas-blurry-images/5219/1 "2016-06-09T17:09:19Z")

</div>

Hi, I have over 1,000 images with nothing but forest.  
I used 80% and 85 % overlap, with 7 to 8 cm / pixel.  
I already checked the tutorial on vegetation areas.

All the results are good (initial processing, point cloud densification), but when I get to the mosaic, there is a lot of distortion / blurriness in some parts.

This blurriness appears in areas where the original images are good, with high overlap. If I process the same area in a smaller project, the results are perfect, but if I process everything (all 1,000 images) the results are worse.

Do you have any idea on what the problem may be? I really need to process everything in one project, for colour balancing and overall georeferencing.

Does anyone know why this happens, and what processing options I can use to avoid it?

Thanks!

---

<div class="post-metadata">

**Author:** ![Pierangelo\_Rothenbuhler](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/pierangelo_rothenbuhler/32/2439_2.png) [@Pierangelo\_Rothenbuhler](https://community.pix4d.com/u/Pierangelo_Rothenbuhler)\
**Post date:** [June 16, 2016, 6:47am UTC](https://community.pix4d.com/t/vegetation-areas-blurry-images/5219/2 "2016-06-16T06:47:51Z")

</div>

Hi Alexandre,&nbsp;

If you see differences in the matching of different regions of the project in&nbsp;Section 2D Keypoint Matches from&nbsp;the Quality Report.&nbsp;The problem may come from step 1 of processing.

In addition, if you think that the artifacts you see in the orthomosaic are correlated to uncalibrated images in the regions with lower matching, you could try to do the following:

1. Make a backup of your project, so that you can make changes on another saved copy.

2. Change the size of the Keypoints Image scale to 1/2 (maybe also try 1/4).  
In Process \> Processing Options \> 1. Initial Processing \> General \> Keypoints Image Scale, select Custom and set Image Scale to 1/2 (Half image size) or 1/4 (Quarter image size). Then, you need to run step 1. Initial Processing again.

3. Verify in the Quality Report if this gives a better matching in lower regions. If this is still a problematic area, you could try to add Manual Tie Points (MTPs) and Reoptimize, which should help create matches in this area. Instructions on how to add MTPs:[https://support.pix4d.com/hc/en-us/articles/202560349](https://support.pix4d.com/hc/en-us/articles/202560349)

4. Then, you can process step 2 and 3 again.

In any case, we would suggest to add Manual Tie Points (MTPs) to your project and Reoptimize, as in 3).

Best regards,