photogrammetry

Measuring an object from a picture using a known object size

由 我的未来我决定 提交于 2020-01-01 00:40:11
问题 So what I need to do is measuring a foot length from an image taken by an ordinary user. That image will contain a foot with a black sock wearing, a coin (or other known size object), and a white paper (eg A4) where the other two objects will be upon. What I already have? -I already worked with opencv but just simple projects; -I already started to read some articles about Camera Calibration ("Learn OpenCv") but still don't know if I have to go so far. What I am needing now is some

OpenCV Orb not finding matches once rotation/scale invariances are introduced

由 早过忘川 提交于 2019-12-28 03:24:10
问题 I am working on a project using the Orb feature detector in OpenCV 2.3.1 . I am finding matches between 8 different images, 6 of which are very similar (20 cm difference in camera position, along a linear slider so there is no scale or rotational variance), and then 2 images taken from about a 45 degree angle from either side. My code is finding plenty of accurate matches between the very similar images, but few to none for the images taken from a more different perspective. I've included

what are my research areas for image processing project?

由 限于喜欢 提交于 2019-12-21 19:55:08
问题 For my final year project I'm doing a vehicle detail modification system. the system should be able to these following tasks. I'm using a size image of a vehicle taken from a fixed distance lets say from 5m. and different colors and rim images are stored I'm my application, that is is the basic idea. detect the tire and the alloy rim of the vehicle detect and measure the rim size of the installed rim apply a new alloy rim to the vehicle ( embed or put the alloy rim on top of the original

Measure size of object using reference object in photo

由 女生的网名这么多〃 提交于 2019-12-19 03:23:14
问题 I'd like to calculate size of object in a photo which includes both a target object and a reference one . I think what I'd like to do is what this software achieves (I don't know how precise this software is) https://itunes.apple.com/us/app/photo-meter-picture-measuring/id579961082?mt=8 I've already found, in general, it's called photogrammetry and seems active research field. How would you find the height of objects given an image? https://physics.stackexchange.com/questions/151121/can-i

How would you find the height of objects given an image?

由 一曲冷凌霜 提交于 2019-12-18 10:36:58
问题 This isn't exactly a programming question exactly. I just want to know what your approach would be to a common problem in Digital image processing. Let's say you have an image of a few trees in say jpg format. How would you go about finding the heights of each of these trees? The photo is the only input you have. I want to know the approaches you have not to code. So it doesn't matter if your answers are vague, or non DIP-ish. Small correction : The height need not be the actual height of the

Extracting descriptive information from a LiDAR cloud (.las files)

由 て烟熏妆下的殇ゞ 提交于 2019-12-13 16:43:30
问题 I have .las (lidar data) file, now I wanted to know the size of it, for example how long it's width and height in kilometers. How is it possible to retrieve these kind of info? 回答1: tl;dr: install libLAS and run lasinfo myfile.las . Lasfile headers, in general, shouldn't be trusted since they may not agree with the true data bounds. A more robust approach is to calculate the spatial extents of the data by reading the points themselves. Here's a few free and open-source ways to calculate the

Determining camera parameters

由 孤街醉人 提交于 2019-12-09 13:48:26
问题 Given a picture taken by a simple digital that contains an image of a rectangle of known dimensions. How can I - to some degree of accuracy - determine the parameters of this camera? I am mostly interested in Pan-, Tilt- and Swing angles. Optionally distance to the rectangle would be nice. I acknowledge the fact that the focal length and resolution of the camera should be known, but it can be assumed that they are available (for example through exif metadata). Are there any simple algorithms

Finding the angle of a perspective image

由 天涯浪子 提交于 2019-12-07 14:16:27
问题 I'm working on a floor design app that allows the user to pick preset floor images and view them within a preset room image. My problem is I'm struggling to get the perspective of the floor image to match the room image properly. I have played around with setting the height of the viewpoint and the tilt but is there a way to calculate what these should be by using the real world measurements of the floor and room image? My knowledge in perspective drawing is very limited so I apologise if I'm

Finding the angle of a perspective image

由 一曲冷凌霜 提交于 2019-12-06 01:53:33
I'm working on a floor design app that allows the user to pick preset floor images and view them within a preset room image. My problem is I'm struggling to get the perspective of the floor image to match the room image properly. I have played around with setting the height of the viewpoint and the tilt but is there a way to calculate what these should be by using the real world measurements of the floor and room image? My knowledge in perspective drawing is very limited so I apologise if I'm using the wrong terminology. Any help or advice would be appreciated. Thanks Gwen You should try to

what are my research areas for image processing project?

由 霸气de小男生 提交于 2019-12-04 11:44:54
For my final year project I'm doing a vehicle detail modification system. the system should be able to these following tasks. I'm using a size image of a vehicle taken from a fixed distance lets say from 5m. and different colors and rim images are stored I'm my application, that is is the basic idea. detect the tire and the alloy rim of the vehicle detect and measure the rim size of the installed rim apply a new alloy rim to the vehicle ( embed or put the alloy rim on top of the original image haven't decided yet) change color of the vehicle body apply tint colors to the vehicle windows
订阅 photogrammetry