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Extracting image from PDF with /CCITTFaxDecode filter

Actually, vbcrlfuser’s answer did help me, but the code was not quite correct for the current version of BitMiracle.LibTiff.NET, as I could download it. In the current version, equivalent code looks like this: using iTextSharp.text.pdf; using BitMiracle.LibTiff.Classic; … Tiff tiff = Tiff.Open(“C:\\test.tif”, “w”); tiff.SetField(TiffTag.IMAGEWIDTH, UInt32.Parse(pd.Get(PdfName.WIDTH).ToString())); tiff.SetField(TiffTag.IMAGELENGTH, UInt32.Parse(pd.Get(PdfName.HEIGHT).ToString())); tiff.SetField(TiffTag.COMPRESSION, Compression.CCITTFAX4); tiff.SetField(TiffTag.BITSPERSAMPLE, UInt32.Parse(pd.Get(PdfName.BITSPERCOMPONENT).ToString())); tiff.SetField(TiffTag.SAMPLESPERPIXEL, 1); tiff.WriteRawStrip(0, raw, … Read more

Find local maxima in grayscale image using OpenCV

A pixel is considered a local maximum if it is equal to the maximum value in a ‘local’ neighborhood. The function below captures this property in two lines of code. To deal with pixels on ‘plateaus’ (value equal to their neighborhood) one can use the local minimum property, since plateaus pixels are equal to their … Read more

Google Maps image?

Masashi Katsumata has come up with a Snapshot Control that takes a snapshot of a Google Maps with a path on it and creates an image from it. Blog post: http://googlegeodevelopers.blogspot.com/2009/09/snapshotcontrol-10-using-static-maps.html

How do I stretch an image to fit the whole background (100% height x 100% width) in Flutter?

To make an Image fill its parent, simply wrap it into a FittedBox: FittedBox( child: Image.asset(‘foo.png’), fit: BoxFit.fill, ) FittedBox here will stretch the image to fill the space. (Note that this functionality used to be provided by BoxFit.fill, but the API has meanwhile changed such that BoxFit no longer provides this functionality. FittedBox should … Read more

How can I add an image to all pages of my PDF?

It’s normal that the image is only added once; after all: you’re adding it only once. (Or you’ve left away some essential steps in your code snippet: see the edit I made.) In any case: you can solve your problem by using a page event. There are some examples in Java here: http://itextpdf.com/sandbox/events Or you … Read more

How to convert BufferedImage to image to display on JSP

First, JSP is a view technology providing a template to write HTML/CSS/JS in and the ability to interact with backend Java code to control page flow and access backend data. Your problem is more in HTML. Now, to display an image in a HTML page, you need the HTML <img> element. To define/allocate an image, … Read more

Storing images in NoSQL stores

Whether or not to store images in a DB or the filesystem is sometime one of those “holy war” type of debates; each side feels their way of doing things is the one right way. In general: To store in the DB: Easier to manage back-up/replicate everything at once in one place. Helps with your … Read more

matplotlib imshow(): how to animate?

You’re very close, but there’s one mistake – init and animate should return iterables containing the artists that are being animated. That’s why in Jake’s version they return line, (which is actually a tuple) rather than line (which is a single line object). Sadly the docs are not clear on this! You can fix your … Read more

Mutual information and joint entropy of two images – MATLAB

To calculate the joint entropy, you need to calculate the joint histogram between two images. The joint histogram is essentially the same as a normal 1D histogram but the first dimension logs intensities for the first image and the second dimension logs intensities for the second image. This is very similar to what is commonly … Read more

How do I force Kubernetes to re-pull an image?

Kubernetes will pull upon Pod creation if either (see updating-images doc): Using images tagged :latest imagePullPolicy: Always is specified This is great if you want to always pull. But what if you want to do it on demand: For example, if you want to use some-public-image:latest but only want to pull a newer version manually … Read more