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Questions tagged [exposure]

44 questions
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Calculate person-time per calendar month using two date columns as references

I have a dataframe like the one below in R: ### Packages library(tidyverse) library(Epi) library(survival) library(lubridate) ### Create data: End_Date <- as.Date("1968-01-01") + days(sample (c(250:365), size=500, replace =T)) Example_DF <-…
Pontus Hedberg
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The AE lock for Camera X doesn't work like should

I use Camera X and trying to lock AF and AE using FocusMeteringAction, AF locking fine but AE doesn't lock. What can be a reason? camerax_version = "1.1.0-alpha02" val factory: MeteringPointFactory = previewView.meteringPointFactory val point:…
Oleg Sokolov
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How to setup altbeacon to prevent stoping scan when Android dozes

I have an Android app that implements an foreground service, uses a partial wakelock and has the permission to empty the battery by using REQUEST_IGNORE_BATTERY_OPTIMIZATIONS as explained here:…
constanze
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Avoid Exposure of Keycloak

Currently, even with a custome theme, Keycloak exposes itself, eg. when an incomplete URL is called (error page) or when landing URLs are used. What is the best practice to avoid this? Ideally, the OAuth2 solution should not be visible for users. Is…
Ice09
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Camera's exposure in OpenCV/Python in different operating system

I was working my project with one webcam in both windows10 and ubuntu 16.04, and I find when I get this webcam's exposure by cap.get(cv2.CAP_PROP_EXPOSURE), I will get a negative integer (around -5 to -7) in windows10, and a positive integer (around…
Tony Lin
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Objective c how to reset AVCaptureDevice exposure to defaults

I'm setting custom exposure/iso with the camera using: AVCaptureDevice* cd = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; [cd setExposureModeCustomWithDuration:cmtime ISO:iso completionHandler:nil]; This works fine. However, for…
user3335999
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Why I can not get auto change exposure duration when set exposureMode is AVCaptureExposureModeContinuousAutoExposure

I'm developing a photo capture app, and want when the light is low to auto set exposure duration auto down, so I search the API AVCaptureExposureMode, and API said when exposureMode set to AVCaptureExposureModeAutoExposure or…
Alive
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How to set camera to auto-exposure with OpenCV 3.4.2?

I am working with a PS-Eye-3 camera, libusb, PSEye driver, OpenCV 3.4.2 and Visual Studio 2015 / C++ on Windows 10. I can set the exposure of the camera to any value by using this code: cv::VideoCapture *cap; ... cap = new…
salocinx
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Defined PiCamera camera.shutter does not match with queried camera.exposure_speed

Within the Raspberry Pi, defined camera.shutter does not match with queried camera.exposure_speed. The picamera API document-PiCamera API document states: Exposure_speed- Retrieves the current shutter speed of the camera. When queried, this property…
icypy
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Manually set exposure for iOS camera in Swift 4

How can I set Aperture and how it will effect in image? I have managed ISO and shutter speed.but I am not able to set Aperture value.
Rohan Mali
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How can I change the exposure of an sRGB image?

I wish to "normalize" the exposure of a set of images before doing further processing. I tried the following: 1) convert sRGB to CIE_XYZ per Wikipedia page on sRGB; 2) multiply or divide "Y" by 2 to achieve a 1 stop EV change; 3) convert CIE_XYZ…
user1146345
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How to programatically adjust brightness of an image without saturating highlights?

I am developing an image processing algorithm to adjust brightness, contrast, shadows, highlights, levels and gamma. I'm having trouble modeling brightness to behave mostly linear (like the exposure adjustment) but compressing the highlights instead…
Adriel Jr
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Unity WebCamTexture video lags in lowlight conditions

I have made a simple video streaming application in unity.I use the device Webcam through unity's WebCamTexture class. I have a RawImage in my canvas on which i render the WebCam live feed as follows: public RawImage image; private…
With A SpiRIT
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Gopro-py-api (KonradIT) - night exposition

Dear Python programmers here, can someone advises, which command use for a night shot - with long exposure. I suppose something with gpControlSet before goproCamera.take_photo(1) - I have gopro7. Daily photos and video without a…
budwazzer
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