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Messages - mks_gis

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31
Python and Java API / Dense cloud not in project after processing
« on: February 14, 2018, 01:28:28 AM »
Hi,

 I'm processing images from UAV to generate DEM and Orthos. I wrote a Python script to process multiple chunks at the same time (and to learn using Python for PS).

 I'm now using the script and in the build dense cloud step after processing for several hours the dense cloud is not there, even though the log file says it ran successfully. Depth maps don't seem to be there either.  I'm on 1.4.

This has worked in a previous project with multiple chunks, although one one occasion I had the same problem, but on a smaller image set and I just ran it again, this time successfully. I run each step (align, dense, dem, ortho, export) separately, as I check the results and clean up before continuing.

Why is the Dense Cloud missing, what did I miss?

Cheers
Martin


code snippet that runs dense cloud:
def dense_c(self):
        for _ in self.cks:
            _.buildDepthMaps(quality=PhotoScan.HighQuality,
                                filter=PhotoScan.MildFiltering)           
            _.buildDenseCloud(point_colors=True)


Log (last few lines):
2018-02-13 16:45:27
2018-02-13 16:45:27 Depth reconstruction devices performance:
2018-02-13 16:45:27  - 5%    done by CPU
2018-02-13 16:45:27  - 95%    done by GeForce GTX 980
2018-02-13 16:45:27 Total time: 6356.12 seconds
2018-02-13 16:45:27
2018-02-13 16:45:28 Finished processing in 6375.36 sec (exit code 1)
2018-02-13 16:45:28 BuildDenseCloud
2018-02-13 16:45:28 Generating dense cloud...
2018-02-13 16:45:28 Generating dense point cloud...
2018-02-13 16:45:32 selected 284 cameras in 4.853 sec
2018-02-13 16:45:32 working volume: 8580x3829x2775
2018-02-13 16:45:32 tiles: 2x1x1
2018-02-13 16:45:32 selected 135 cameras in 0.001 sec
2018-02-13 16:45:32 preloading data... done in 3.479 sec
2018-02-13 16:45:36 filtering depth maps... done in 881.324 sec
2018-02-13 17:00:18 preloading data... done in 7.266 sec
2018-02-13 17:00:25 accumulating data... done in 12.639 sec
2018-02-13 17:00:39 building point cloud... done in 2.298 sec
2018-02-13 17:00:42 selected 232 cameras in 0.001 sec
2018-02-13 17:00:42 preloading data... done in 5.479 sec
2018-02-13 17:00:47 filtering depth maps... done in 10398 sec
2018-02-13 19:54:06 preloading data... done in 13.742 sec
2018-02-13 19:54:20 accumulating data... done in 29.615 sec
2018-02-13 19:54:51 building point cloud... done in 2.034 sec
2018-02-13 19:54:54 52859925 points extracted
2018-02-13 19:54:55 Finished processing in 11367.2 sec (exit code 1)

Full code:
import PhotoScan
import os

# Checking compatibility
compatible_major_version = "1.4"
found_major_version = ".".join(PhotoScan.app.version.split('.')[:2])
if found_major_version != compatible_major_version:
    raise Exception("Incompatible PhotoScan version: {} != {}".format(found_major_version, compatible_major_version))

class ChunksProc(object):
   
    def __init__(self, cks):
        self.cks = cks

    def remove_align(self):
        for _ in self.cks:
            for c in _.cameras:
                c.transform = None
               
    def align(self):
        for _ in self.cks:
            _.matchPhotos(accuracy=PhotoScan.HighAccuracy,
                            generic_preselection=False,
                            reference_preselection=True,
                            filter_mask=True,
                            keypoint_limit=40000,
                            tiepoint_limit=0)
            _.alignCameras()

    def dense_c(self):
        for _ in self.cks:
            _.buildDepthMaps(quality=PhotoScan.HighQuality,
                                filter=PhotoScan.MildFiltering)           
            _.buildDenseCloud(point_colors=True)

    def dem(self):
        for _ in self.cks:
            _.buildDem(source=PhotoScan.DenseCloudData,
                        interpolation=PhotoScan.EnabledInterpolation)

    def ortho(self):
        for _ in self.cks:
            _.buildOrthomosaic(surface=PhotoScan.ElevationData,
                                blending=PhotoScan.MosaicBlending,
                                fill_holes=False)

    def export(self, pth, prefix):
        for _ in self.cks:
            num = str(_)[-3]
            file = '{}_DSM_{}.tif'.format(prefix, num)
            _.exportDem(path = os.path.join(pth, file),
                        write_world = True)
            file = '{}_Ortho_{}.tif'.format(prefix, num)
            _.exportOrthomosaic(path = os.path.join(pth, file),
                                write_world = True)

    def exp_jpg(self, pth, prefix, w = None, h = None):
        doc.save()
        for _ in self.cks:
            num = str(_)[-3]
            file = '{}_Ortho_{}.jpg'.format(prefix, num)
            _.exportOrthomosaic(path = os.path.join(pth, file),
                                write_world = True)   

doc = PhotoScan.app.document
if not len(doc.chunks):
        raise Exception("No chunks!")
cks = ChunksProc(doc.chunks)
pth = r'E:\Dominica\Data Output Folder'
jpgpth = r'E:\Dominica\Data Output Folder\JPG Orthos'
prefix = input('Enter file prefix: ')
cks.align()
doc.save()
cks.dense_c()
doc.save()
cks.dem()
doc.save()
cks.ortho()
doc.save()
cks.export(pth, prefix)
cks.exp_jpg(jpgpth, prefix)
doc.save()

32
General / Documentation on smoothing mesh
« on: June 27, 2017, 06:25:11 PM »
Hi,

 I'm smoothing a mesh in Tools and am wondering if there's any documentation on the tool. What do the numbers mean?

Cheers
Martin

33
General / Compact Dense Point cloud does not remove deleted points
« on: June 19, 2017, 12:45:34 PM »
Hi,

 I've got a rather large point cloud and I'd like to mesh just a section of it, as PS will not mesh the whole thing.

 I've cropped to a selection and ran compact dense cloud, which, as I understand it, should remove deleted points. I also ran update dense cloud, but the point number remains stubbornly high.

How do I delete deleted points completely?

Thanks
Martin

34
General / Re: Aerial photography overlap overspecified? What works?
« on: October 03, 2015, 12:31:21 PM »
Restrictions in time, batteries, tide, access to site might require a more complex approach.

35
General / Re: Sony Arw files not recognised
« on: October 02, 2015, 06:30:12 PM »
Hi,

 A massive advantage of reading the Canon RAW files directly is that RAW files are smaller than 16-bit or even 8-bit tif, by quite a margin. Converting the Sony ARW to tif is annoyingly time consuming. As I can't hang my DSLR from our octocopter I think I might only set the Sony to RAW  for special projects, as I'm getting some good results with JPG.

M.

36
General / Aerial photography overlap overspecified? What works?
« on: October 02, 2015, 06:17:33 PM »
Hi,

 The PhotoScan manual specifies 60% of side overlap + 80% of forward overlap for aerial photography. I'm struggling to plan a mission for this in Mission Planner, as the interval between pictures drops below 2 second if you do this. My A6000 camera cannot keep up with this pace and I get fewer images than CAM triggers; I need to keep above 2s for continuous shooting without dropping images. If I reduce the flying speed my mission time increases beyond the capacity of my battery. A balance needs to be struck.

 I have tested PS derived DEM vs differential GPS and with a 60% overlap and 70% side overlap I have achieved mean 4.3cm elevation error on a DEM. That's not bad at all.

 What are the experiences of other users? What overlaps do you specify and what works for you? Do you increase altitude or drop speed for instance? Change focal length (I shoot 35mm)?

Cheers

 

37
General / Re: Sony Arw files not recognised
« on: October 01, 2015, 06:09:12 PM »
Thanks James, that's useful.

38
General / Re: Sony Arw files not recognised
« on: September 30, 2015, 07:18:40 PM »
Hi,

 Thanks, we are still trying to learn and that info helps. I'll try the TIFF conversion for the ARW.

 Canon RAW work directly, not just as thumbnails as you've found with your Nikon. My images don't show much CA or vignetting, so the model works just fine. But I might try the same model with converted tif.

 How much processing do you do with RAW in Lightroom? Lens correction, I guess? Do you change exposure or white/black points? Lighten shadows?

Cheers
Martin

39
General / Re: Sony Arw files not recognised
« on: September 30, 2015, 01:37:36 PM »
Hi,

 Windows recognises the ARW files, I can see them in the Windows Explorer preview. I have installed both the windows raw pack and the Sony RAW drivers. Still PScan won't open the ARW RAW files.

 Any Ideas?

Cheers
Martin

40
General / Sony Arw files not recognised
« on: September 29, 2015, 07:27:04 PM »
Hi,

 We're only just starting out on PhotoScan and are trying different things. PS reads my Canon RAW beautifully, but the Sony RAW format ARW from our A6000 isn't recognised. Can PS somehow read ARW or do I need to convert to tif if I don't want to use jpg?

Cheers
M.

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