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Questions tagged [image-processing]

Image processing is the computational transformation of an image signal. It's about the technical side of batch transformations, conversions, and enhancements, as distinct from post-processing (adjusting an image to achieve a desired look, probably using image processing).

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1answer
51 views

Capturing image from movie on memory stick inside camera without using a computer

I'm in a dilemma. Currently the computer in my house is a pentium 3 with Slackware 13 Linux OS. (Yes I know, stone-age compared to today's technology). I also own an Canon EOS Rebel T4i EOS 650D ...
2
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3answers
75 views

Auto batch resize images through adding white space (i.e. not distorting original proportions)

I've got a number of photos, each of which are a different size and resolution. I'd like to make them all square - the resolution isn't critical, and can differ by photo, but each output image must be ...
-3
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1answer
117 views

Heatmap of an image [closed]

I want to create the heatmap of an image for research purposes. Is there any algorithm to create heatmap of an image ? Also, if I have a RAW image out of a Nikon D5200 (.NEF file format), will it ...
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2answers
91 views

Are there effective and simple methods to emulate pixel shift?

This question is about image-processing methods to emulate the noise reduction and increase in details achieved by cameras with good built-in pixel shift (Sony A7 RIII, Pentax K-1 and others). I am ...
4
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2answers
147 views

Editor's rights to results of processing photographer's RAW image file?

I edited the RAW image file that a photographer offered at the /r/EditMyRAW Reddit sub. I am not familiar with the rights of an editor/retoucher and am curious to know how the editing work/original ...
2
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2answers
75 views

How to programatically adjust exposure based on image metadata?

As part of a photogrammetry project, I took a number of photos (in NEF RAW format) of an object using manual settings on a D800. However, I forgot to turn off auto-iso (argh!). So, all my photos ...
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2answers
177 views

What image/camera/lens quality metrics are relevant for resolving human subjects?

I am attempting to gather data for creative historical purposes. However, I'm a computer scientist, not a physicist or a photographer, and there seem to be a gazillion considerations. The environment ...
0
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1answer
45 views

How does the scale of a CCD work and what does the function of gamma do to this scale?

I am using a fluorescent microscope with a CCD attached so that I can take images. What I'm wondering is how the scale between the pixel values works? is it different for different CCDs?
3
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2answers
83 views

How can I interpolate each color individually (i.e. export an image just with Red Color) using dcraw?

I'm doing a project where I need to export 3 different images from a raw file (DNG or RAF), each image with a different color (Red, Green and Blue). I'm using dcraw.c, Dave Coffin's raw photo decoder. ...
6
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2answers
114 views

Can using a high resolution sensor and downsampling compensate for a soft lens?

In this question Does super-sampling produce good results? the difference in quality between using a high and low resolution sensor of the same size and then downsampling the high resolution one gives ...
5
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3answers
199 views

How do I correct the huge blue-shift in these images?

I recently inherited a lot of images with a lot of blue on them (attached below) I would like to correct this, get the natural colours. I am just aware it was taken using a Nikon D60 18-55 VR lens, ...
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2answers
79 views

How to make Identical Images Of the Same Dimensions and Pixel Density Have Similar size [closed]

I have two images with the same dimensions. One is a facebook icon and the other is a plain white image. They are 32 bit, 128 pixels by 128 pixels, 96 pixels per inch and 3.39 cm but one is 1.87kb and ...
2
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4answers
1k views

Finding focal length from image size and FOV

I have bumped into this statement in an Engineering journal. The statement is mentioned on right side example. A 640x480 image with a horizontal FOV of 47 degrees gives focal length f = 740 pixels. ...
2
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4answers
677 views

How to copy Images Back To DSLR from computer?

I'm looking to solve this issue of trying to get my DSLR read images to put on the memory card from the computer. Here are the steps to reproduce the issue: You click a photo Transfer it to your ...
4
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1answer
354 views

How to process DSLR RAW files for display on modern HDR-capable TVs & computer monitors? (actual 10bit/ch or 12bit/ch dynamic range)

10bit/ch display panels are becoming common. The latest generation UHD TVs can display 10bit/ch, some consumer TVs have as high as 1000nit output. Very recently HDR computer monitors have (finally) ...
12
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11answers
5k views

Why don't cameras record light data throughout the entire shutter?

Sorry if the question title is confusing, I don't know the best way to word this,so feel free to change it if you can think of something better. I learned electronic shutters can capture the image all ...
1
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1answer
197 views

How to create abstract color profile to encode specific color transformation?

I have a set of images (48-bit TIFF) that are encoded in ProPhoto RGB. I have a set of alternative input color profiles (related to ProPhoto RGB, but slightly different) that I can assign to the ...
2
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2answers
192 views

What is the name of the problem where lines appear in a photo where there should just be a smooth gradient?

I don't remember the name of this problem and it drives me crazy. I googled everything similar to "lines in photo" but I didn't find the solution. The problem is that on my PC monitor I don't see ...
5
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3answers
241 views

How to deal with single channel overexposure?

I've been shooting quite a few gigs at clubs/concerts and repeatedly experience issues with scenes lit by small bandwidth lights (for example lasers). These lights cause a single channel to ...
6
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3answers
166 views

Motion-Still photographs

So I've seen these high quality photographs on Instagram which look like they are Combination of motion & still photographs. I mean some parts of the image is still just like a normal snapshot ...
6
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2answers
6k views

How can I convert an Apple iOS HEIF image into JPEG?

How can I convert an HEIF/HEIC image into a JPEG? Maybe using ImageMagick?
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1answer
80 views

What is this filter called and which programme has it? [closed]

I want to use this filter in my pictures. What's this filter called and which programme can be used to apply this filter?
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2answers
443 views

Lightroom Grey card algorithm for white balancing

I am trying to learn grey card algorithm to adjust the image color based on the Grey Card used. From as far this answer I had tried one of my photo:- Selection color(Grey Card Color) :- 115,168,178 ...
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1answer
101 views

What photo characteristics work best with facial recognition software?

I have teams that are doing surveys and taking photos of respondents (in and around their homes, often outside) with permission to take and use these photos for facial recognition. We're complying ...
4
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2answers
247 views

Can deconvolution help improve the apparent sharpness of mirror lenses?

I have recently ordered a Samyang 500 mm/f6.3 mirror lens on eBay, for about £80, largely out of curiosity -- at the very least, it will be an interesting toy and I can always sell it. Mirror lenses ...
3
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3answers
675 views

How to use histogram adjustment when scanning?

I just got an Epson V600 and have been trying to learn some of the features, such as the Histogram Adjustment feature of the included processing software. The interface looks like this: What are the ...
0
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2answers
627 views

Get pixel to mm ratio from image

Is is possible to get pixel to mm ration from image exif. I have focal length of camera, image resolution, as well as camera distance from object in image (outside exif). I have distance from origin (...
0
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3answers
566 views

Image Stacking for noise reduction using MATLAB [closed]

I'm new to Image processing and started using MATLAB for Astrophotography processing. I'm trying to process 10 corrupted images (Same Image but mixed with different noise) of Planet Saturn using ...
11
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2answers
2k views

Why does my Canon 700D take so long processing when I take a long exposure? [duplicate]

I am trying to get into long exposure time lapse photography, and was wondering if there was a way of speeding up or turning off the processing of the image! When doing long exposure time lapse at (...
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3answers
551 views

How to calculate distance of an object from camera or size of an object in an image? Have to utilise already generated camera parameters to find these [duplicate]

How to calculate distance of an object from camera or calculate the size of a object in an image? Given that, I have already generated the camera parameters (intrinsic and extrinsic). I have to ...
0
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2answers
145 views

Is it possible to simulate any color-only filter with curves?

In this question it was asked whether it was possible to reproduce any color-only change to an image using just curves. In my answer, I said that there were color-only changes such as conversion to ...
0
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2answers
184 views

Trying to create a serial number for every imported image

Someone correct me if I'm wrong, but the sequence numbers Lightroomor CaptureOne Pro (I'm currently using both) supports in file naming (at import or export) are not continuous, right? In other words, ...
5
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2answers
979 views

Is it possible to find out what compression ratio was used for a particular JPEG?

I have a couple of JPEGs. Is there a way to find out which compression level was used when encoding them? That is, were they encoded at level 60 or 90? The reason I'm asking is because I have a site ...
1
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1answer
225 views

Why do some cameras offer 5-axis stabilization only in video?

The new EOS M6, not surely FZ2000 etc. offer 5-axis image stabilization only when shooting video. Why is that?; I think it takes more processing power to do such thing in video mode though...
0
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1answer
587 views

What's the Largest File Size that PhotoShop CS 5.1 can Handle?

I'm building a large landscape montage using about 50 RAW images at 16Mb per image. I've successfully managed processing montages before that were 1.5 Gb but over the course of the few hours it took ...
0
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1answer
397 views

How to calculate image dimensions from camera parameters? [duplicate]

I'm using Raspberry Pi Camera v1 with the following parameters Sensor size: 3.67 x 2.74 mm (1/4" format) Pixel Count: 2592 x 1944 Pixel Size: 1.4 x 1.4 um Lens: f=3.6 mm, f/2.9 Angle of View: 54 x 41 ...
2
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2answers
590 views

Why my images get pixelated when I scale them up? [duplicate]

I'm a photographer, I usually edit photos through photoshop, lightroom. But when I try to scale the images it looks pixelated. I can't use the images for large banner or publishing. My camera model is ...
1
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1answer
623 views

Canon DPP 4 no longer auto rotates

Hi to all Canon Digital Photo Professional users out there. I have been using DPP for years with no issues. Recently I updated my install to version 4. Now, it no longer auto rotates photos taken in ...
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5answers
6k views

How was photo data processed and transferred back to Earth from satellites before digital photography became commonplace?

I am looking at pictures taken by some of the first satellites and landers there were like the Viking Lander on Mars in ~1976 or even the first image of the backside of the Moon in 1959 by Luna 3 I ...
2
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2answers
520 views

How to calculate digital photo precision based on camera specification?

I'm doing a project which involves analyzing an object's width from a photo with given precision of about 0.1 mm. I am to the point where I have to choose which camera to buy in order to obtain the ...
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5answers
303 views

What does the term “channel” mean in photography?

What is the definition of "channel" in photography? I know that there are "RGB channels", but what does that actually mean?
9
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2answers
290 views

How can I stitch images with the same center but different peripheral content?

Looking for help in solving this problem. I want to stitch a series of images together. The easiest way to describe it is, let's say, I am walking down a long street with a repeating pattern of ...
2
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3answers
527 views

Why are my RAW images already in colour if debayering is not done yet?

I recently went on a trip and took a bunch of pics with my girlfriends Canon Rebel. We shot in RAW, and now I am going to process the RAW images in DarkTable (my first time ever). I have read that ...
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2answers
528 views

Using rawtherapee to create an image like a DSLR camera in bracketing mode

Can rawtherapee can be used to create an image like a DSLR camera in bracketing mode? I noticed that rawtherapee has many controls under the exposure tab. I was told that just changing the exposure ...
11
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7answers
2k views

What would happen if a camera used entirely different primary colors?

So, as many people know, humans have three cones cells, enabling us to see three distinct "primary" colors, which may combine to form the entire spectrum that we are capable of seeing. Meanwhile, many ...
2
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3answers
106 views

How to do automated image analysis of astronomical photographs? [closed]

I have many pictures like the following: As many of you may recognise, this is a picture of Jupiter and its four Galilean moons. Using these images, I am aiming to calculate the mass of Jupiter by ...
2
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2answers
704 views

Are basic editing tools on Instagram fundamentally the same as those in Photoshop or Lightroom?

I shoot with a Canon DSLR (I usually shoot in JPEG cos I'm a noob) and like to upload good photos to Instagram. Typically this involves importing the images to my computer, uploading them to Google ...
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1answer
426 views

Why gamma curve is applied in cameras?

I am tuning ISP(image signal processing) of one chip used in cameras. Gamma curve is used in the pipeline. I don't understand the reason. The CCM(Color correction matrix) will map images to sRGB color ...
0
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1answer
1k views

How to remove fisheye in PhotoScan Pro?

I am trying to build a 3D model of a site in CA using Photoscan Pro. The images were taken by 3DR solo drone GoPro camera. I need to process the image in Photoscan, however, I am having trouble with ...
0
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2answers
114 views

correct lens distortion and angle of view for scanning large planar objects

I made some pictures of my inner panels of my van (VW T5) because I would like to convert them to a vector graphic. My intention is to use the data in order to produce my own CNC cut spare parts. I ...