What is the most efficient technique to remove the date that a Camera embeds on any image it takes.
The task is to prepare a script/code/software that shall remove the date from the given input image file (jpeg, png).
Please let me know an optimum way to accomplish this.
Thank you.
Here is an alternative approach to the question. You can determine the average colour of the bottom right corner of the image (size 250px wide x 100px high) with Imageagick like this:
ave=$(convert sign.jpg -gravity southeast -crop 250x100+0+0 -scale 1x1 -format "%[pixel:p{0,0}]" info:)
That will give you the value srgb(199,181,119) for this image. Now you can create a rectangle (200px x 50px) that colour and overlay it onto the image and then blur the edges a little to blend it in:
convert sign.jpg \( -size 200x50 xc:"$ave" \) -geometry +970+780 -composite -region 240x90+950+760 -blur 0x10 out.jpg
I am not sure if you were hoping for something that is forensically indetectable or something that more or less removes the distraction somewhat. Hopefully the latter :-)
A little measuring around shows that the date is located at the following position:
150x40+650+520
i.e. 150 pixels wide by 40 pixels high, located 650 pixels to the right of the top left corner and 520 pixels down from the top left corner.
So, one approach would be to copy the piece of the image directly below that, and paste it on top of the date, which can be done in ImageMagick in one command like this:
convert sign.jpg \( +clone -crop 150x40+650+560 +repage \) -geometry +650+520 -composite out.jpg
That says... take the original image and create a copy of it (+clone), then cut out the piece specified after the crop command command and reset that as though it was the top left corner (+repage). Then paste (-composite) that image at offset +650+520 on top of the original image and save the result as out.jpg.
It is not a beautifully engiineered solution, but may be good enough. It may be desirable to blur the area a little, to help disguise it. Alternatively, it may be possible to select the colours within the date and make them transparent, then to displace the original image a little behind the transparent holes to fill them - I didn't choose that option because it is harder and because you may not like ImageMagick anyway, and there are actually several colours within the date field ranging from browns to golden yellows and selecting them without affecting the remainder of the image might start getting fun!
ImageMagick is free and available for Windows, OSX, Linux etc from here. It is ready installed on most Linux distros anyway.
Related
As stated in the title i have to create a squared image starting from any kind of input image.
If the input image is smaller than thumbnail then i have only to pad it, otherwhise (if geater) should be shrinked without change aspect ratio) so for example :
After few test come up with the following code :
mogrify -auto-orient -define jpeg:fancy-upsampling=off:size={with}x{height}^> -thumbnail {with}x{height}^> -gravity center -extent {with}x{height}^> -background white -quality {dpi} -format {format} -path {path} *.*
Everything work as intended, except for few corner cases.
If the input image is really smaller compared to thumnail size, then the input image tend to disappear (because really small compared to thumbnail size).
So i am trying to figure it how to avoid excessive padding (only the strictly necessary to make the picture squared) when source image is smaller than thumbnail size (and so due to '>' command imamagick will not shrink it).
I have this image:
Using this Imagick cli command:
magick model.png -canny 0x0+1%+10% -negate -blur 3x.7 -solarize 50% -level 50%,0 model_canny.png
it got converted to this :
is it possible to get the position/size of the teeth in the arch? it doesn't have to be perfect. Even if it detects few teeth in the arch it would be a great for me to understand how this works. So far I've tried to use connected-components param and it gives me thousands of results which is obviously incorrect. Here's what I've done so far:
magick model_canny.png -fuzz 5% -define connected-components:verbose=true -connected-components 4 objects.png
Also is it possible to remove the random black lines inside the teeth? Any help would be appreciated..
The usual way to separate objects is to use a morphological erosion, using a command something like this:
magick fangs.png -alpha extract -trim -morphology erode disk:5 result.png
Here is an animation of the effect of various disk sizes:
Taking that a bit further, you could maybe erode in a loop and then do a "Connected Component Analysis" and count the blobs, and keep increasing the disk size till you get a sensible number of teeth.
Or, you may need to work a bit harder and try to fit a parabola (shown in blue) to the pixels that make up the teeth if that is the best shape - not a dentist, myself! Then, with a parabola, you could find the normals to the parabola (shown in red) all the way around and take the normal that crosses the smallest amount of tooth as the boundary between the teeth. Rough diagram:
Or maybe superimpose your Canny edge-detected image on the fitted parabola, and see where your edges intersect with it.
I have images of old paintings. The paintings are old and dusty with faded colours as shown here.
How do I give any image this type of an 'old' appearance? I couldn't find any filters or openCV functions to achieve this type of look?
EDIT: My question is different as the other one solves the problem using the sepia filter and using the grain effect. I'm not looking for that sort of an appearance. I want my image to look like an old damaged painting. This means that the colours should be faded and it should have an overall dusty appearance.
There's no real need to write any code and use OpenCV, since you can do all that on the command-line with ImageMagick which is installed on most Linux distros and is available for macOS and Windows.
First, fading. This can be simulated by reducing the saturation of an image. So if we start with this Mona Lisa image:
We can fade her using this command to leave the brightness unchanged at 100% of its original value and reduce the saturation to 50% of its original value. I am intentionally "over-egging" everything so you can see it clearly. You should maybe be more subtle.
convert mona.jpg -modulate 100,50 result.jpg
Next, vignetting - or dark corners. You can use something like this:
convert mona.jpg \
\( +clone -fill white -colorize 100 -background "gray(50%)" -vignette 0x15+1+1% \) \
-compose multiply -composite result.jpg
The 0x15 controls the roll-off, or how gradual the change is, so increase the 0x15 if you want a smoother roll-off or go down to 0x5 if you want it harder. The +1+1% means that the ellipse will be 1% smaller than the width of the image and 1% smaller than the height of the image. So if you want a smaller light hole and bigger dark corners, go for +10+10%. The degree of darkening is controlled by the gray(50%) so you can diddle with that till you are happy too :-)
Finally, dust. Best thing is to get a PNG image of some dust, resize it to match the size of your image and overlay it.
First get the size of Mona:
identify mona.jpg
mona.jpg JPEG 403x600 403x600+0+0 8-bit sRGB 57130B 0.000u 0:00.000
So, she is 403x600. Here is a sample of some dust - again, you can be more subtle - I am just being heavy-handed so it shows:
Let's resize the dust to match and overlay it:
convert mona.jpg \( dust.png -resize 403x600\! \) -composite result.jpg
Then you can combine all three effects, fading, vignetting and dust, into a single command:
convert mona.jpg -modulate 100,50% \
\( +clone -fill white -colorize 100 -background "gray(50%)" -vignette 0x15+1+1% \) \
-compose multiply -composite \
\( dust.png -resize 403x600\! \) -composite result.jpg
If you have lots of images to process, you can script the whole lot to be done in parallel very easily with GNU Parallel - see some of my other answers for examples.
Keywords: artificial ageing, image ageing, command-line, command line, ImageMagick, magick, old, old photo, photo effect, convert, dust, scratches, fading, faded.
I would suggest using a style transfer tool, rather than manually coming up with a procedure to mimic the style of an old painting. There are plenty free style transfer tools and libraries available.
I would suggest using OpenCV various filters to create the effect you need. You have to try various filters and try to figure what works for you, But I have suggestions which you can try.
For color, fading try Erode and Dilate with small kernel size.
Next, add some noise, Salt and Pepper will do just fine, also try gaussian filter after applying noise. Salt and Pepper is non-linear noise and Gaussian is a linear filter so it will just spread the noise, but keep the filter kernel small.
Try finding some images of dust, torn page edges (WITHOUT BACKGROUND) like in the following link:
https://www.google.co.in/searchq=dust+png+images&newwindow=1&rlz=1C1CHBF_enIN797IN798&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjtq7ZvfPcAhXJO48KHQ2UD0kQ_AUICigB&biw=1536&bih=759#imgrc=_
Keeping alpha transparency in mind, mask these over your images.
With all the things in correct proportion and sequence, You will get your old dusty image.
I'm playing with this creative script here: http://www.fmwconcepts.com/imagemagick/transitions/. The plan is to mimic what happens with the script with ffmpeg and generate video with transition effects between pictures. My current understanding is this:
I have two pictures A and B.
I need in between a couple of pictures (say 15) that are partially A and partially B.
To do that I use the composite -compose src-over A.jpg B.jpg mask-n.jpg out.jpg command.
During the process, the mask-n.jpg gets generated automatically that gradually change from all black to all white.
Depends on the mathematically equations, the way the transition effect looks is different.
In one of the example, Fred the author gave this:
convert -size 128x128 gradient: maskfile.jpg
This will generate a image like this:
This is partially black and partially white. For the transition to work, I'll need an all white one and an all black one and a couple of others in between. What's the magical command to do that?
I have re-read your question and I am still not sure I understand, but maybe you want a dark grey to light grey gradient:
convert -size 128x128 gradient:"rgb(40,40,40)-rgb(200,200,200)" greygrad.png
Not sure I understand what you are trying to achieve, but if you want an all black one, use:
convert -size 128x128 xc:black black.jpg
and an all white one:
convert -size 128x128 xc:white white.jpg
and a grey one:
convert -size 128x128 xc:gray40 gray40.jpg
If you want to join them for transitions, use
convert im1.jpg im2.jpg -append result.jpg
or use +append to join side by side instead of above and below.
Consider using PNG instead of JPEG throughout.
Fred tells you how the script works at the bottom of the page you have linked to with some example code.
According to his explanation there is only the one mask images as:
The mask images is gradually made lighter
OK, so I have a folder of like 16 images all between the dimensions of 205x150 to 103x148. I want to size them down to the pixel height and width of 25px and stack them horizontally on a transparent background... is that possible?
I should probably be using ImageMagick for this...
You can do all that with ImageMagick.
You're question is not very specific, so here's a quick cheat sheet of command examples that may help you:
# resize image to width 25, keeping aspect ratio
convert -geometry 25x src/image1.png out/image1.png
# resize image to height 25, keeping aspect ratio
convert -geometry x25 src/image1.png out/image1.png
# concatenate images horizontally
convert +append src/image1.png src/image2.png out/image12horiz.png
# concatenate images vertically
convert -append src/image1.png src/image2.png out/image12vert.png
In addition, the montage command is probably perfect to create the final image you are looking for (on a transparent bg with some padding, etc), but I don't remember the syntax.
Another useful command is identify, to find the dimensions of images (along with other details).
After you install ImageMagick, you can see the list of commands in man ImageMagick, and get further details on each command in the man pages. There are an awful lot of functions, but it should not be too difficult to figure out the rest on Google. (I do that all the time.)
Just to add something to #janos answer.
I haven't used previous versions of ImageMagick but on version v6 or later according to the docs http://www.imagemagick.org/Usage/resize/#geometry
Geometry is a very special option. The operator behaves slightly differently in every IM command, and often in special and magical ways. The reasons for this is mostly due to legacy use and should be avoided if at all possible.
So other than the -geometry parameter you can still use -resize and omit the value you want in order to keep the aspect ratio. You can also use the -quality parameter to avoid image quality downgrade when resizing them. Value of quality is between 1 (lowest image quality and highest compression) and 100 (best quality but least effective compression). You can read more here: https://imagemagick.org/script/command-line-options.php#quality
For example:
# resize image to height 25, keeping aspect ratio with quality 90
convert -resize x25 original_image.jpeg -quality 90 resized_image.jpeg