photography

What is “antibanding” in photographing?

由 喜夏-厌秋 提交于 2020-01-12 06:56:54
问题 What is "antibanding" in photography? I read this term in Android documentation for the android.hardware.Camera.Parameters.setAntibanding() method. 回答1: Nice example from this website: Gradient effects may suffer from banding (contouring) where noticeable steps can be seen from one shade to another. Apparently this artifact can be typically caused by jpeg compression. The Antibanding() feature tries to prevent this artifact. 回答2: Antibanding function should decrease fluctuations in brightness

Android Photography App Double Exposure

由 大兔子大兔子 提交于 2019-12-11 08:45:31
问题 I would like to create an android app that would combine two photographs together to create something similar to what you would see in a double exposure photograph. Can you give me any ideas on how to do this? 回答1: To get a true double-exposure, all you should need to do is add together the R/G/B values for each pixel with straight addition, with an upper limit of 255 for each component(for 24bpp at least). If it's too bright, you can always reduce it down some afterward. 来源： https:/

Creating a usb time lapse for Cannon EOS Rebel XS using a c# program

由 允我心安 提交于 2019-12-11 03:29:16
问题 I am wondering if this is even possible. I want to make my own software to control the release of the shutter via the remote shutter release. From the diagrams I have seen it has a 3.3 v (no load) and a threshold voltage of 1.8v. I am wondering if I can use limit a usb cables voltage which is around 5.25v, if I am understanding correctly. Is this even possible, or do I need to look in a new direction. I am hoping to write the software in c# which I am fairly confident in. Thank you in advance

How to read Lightroom keywords from image file using PHP?

由 给你一囗甜甜゛ 提交于 2019-12-10 16:16:55
问题 I have a photo community (www.jungledragon.com) that allows users to upload photos. My platform is PHP/CodeIgniter. As part of the upload process I'm already reading EXIF info using PHP's exif_read_data function, which works fine. I read camera details and show these on an info tab. On top of that, user's are expected to manually set the photo title, description and tags on the website after uploading the photo. However, some users manage these fields in their image management program, for

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

360 degrees spinnable object from a photographed real object

由 删除回忆录丶 提交于 2019-12-09 02:14:15
问题 I want to create the ability to spin a photographed object 360 degrees. It spins endlessly based on the speed you "flick" . You spin it left or right by flicking the object left or right . You stop the spin when you touch to stop it if it's spinning. Similar to the app The Elements by Theodore Grey. Here's a video of the part of the app I'm trying to recreate. (i.e. the 3D spinner) https://youtu.be/6T0hE0jGiYY Here's a video of my finger interacting with it. https://youtu.be/qjzeewpVN9o I'm

OpenCV-Python createMergeDebevec returns an array of Inf

由 ↘锁芯ラ 提交于 2019-12-08 04:22:03
问题 I am trying to get some HDR related functions working with OpenCV-Python: specifically I'm trying to reproduce the OpenCV C++ HDR tutorial. Unfortunately, the resulting hdr image/array comes out completely white (all values are Inf). Here is an MCVE. 1.jpg, 2.jpg, 3.jpg are all 870 × 580 RGB (Internal RGB KODAK sRGB Display) JPG images with exposure times of 1/3200, 1/800, and 1/200 respectively. I've tested this with 2 other JPG image sets now, one of which is available on Wikimedia. >>>

Algorithm for measuring the Euclidean distance between pixels in an image

由 别等时光非礼了梦想. 提交于 2019-12-06 05:29:20
问题 I have a number of images where I know the focal length, pixel count, dimensions and position (from GPS). They are all in a high oblique manner, taken on the ground with commercially available cameras. alt text http://desmond.yfrog.com/Himg411/scaled.php?tn=0&server=411&filename=mjbm.jpg&xsize=640&ysize=640 What would be the best method for calculating the euclidean distances between certain pixels within an image? If it is indeed possible. 回答1: Assuming you're not looking for full landscape

How can I check out the picture quality in program using c#?

由 为君一笑 提交于 2019-12-05 17:58:27
I want to check out whether the photograph is suitable for print or not using my application.How can I do that?I don't know much about photo quality?Is the resolution of every photograph is same or not? I think the only factor in print quality that you can check with any certainty (because the other factors are subjective), is the resolution of the image vs. the intended print size. If you have other tangible requirements, like the image must be color, not black and white, you can check for that too. But trying to identify whether an image is too blurry, low contrast, etc., will likely be a

Algorithm for measuring the Euclidean distance between pixels in an image

由 女生的网名这么多〃 提交于 2019-12-04 10:25:18
I have a number of images where I know the focal length, pixel count, dimensions and position (from GPS). They are all in a high oblique manner, taken on the ground with commercially available cameras. alt text http://desmond.yfrog.com/Himg411/scaled.php?tn=0&server=411&filename=mjbm.jpg&xsize=640&ysize=640 What would be the best method for calculating the euclidean distances between certain pixels within an image? If it is indeed possible. Assuming you're not looking for full landscape modelling but a simple approximation then this shouldn't be too hard. Basically a first approximation of
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