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问题 I'm trying to do 2d wavelet filtering in python. I found out about PyWavelets and I have been messing around with it for awhile. I am trying to do the transformation for 4 levels. When I print it out it gives werid output and I'm not sure exactly what is going on. I've tried a few things but this is the latest as an example: test = pywt.dwt2(picture,'db1') Any help on preforming 2d wavelets on images with PyWavelets or just in general would be much appreciated. Thank you. Edit: The type of

问题 I need some help in converting a hex string into an image doing some researches i came up to this code: private byte[] HexString2Bytes(string hexString) { int bytesCount = (hexString.Length) / 2; byte[] bytes = new byte[bytesCount]; for (int x = 0; x < bytesCount; ++x) { bytes[x] = Convert.ToByte(hexString.Substring(x*2, 2),16); } return bytes; } public bool ByteArrayToFile(string _FileName, byte[] _ByteArray) { try { System.IO.FileStream _FileStream = new System.IO.FileStream(_FileName,

问题 I'm trying to do 2d wavelet filtering in python. I found out about PyWavelets and I have been messing around with it for awhile. I am trying to do the transformation for 4 levels. When I print it out it gives werid output and I'm not sure exactly what is going on. I've tried a few things but this is the latest as an example: test = pywt.dwt2(picture,'db1') Any help on preforming 2d wavelets on images with PyWavelets or just in general would be much appreciated. Thank you. Edit: The type of

问题 i have a webhosting that gives maximum memory_limit of 80M (i.e. ini_set("memory_limit","80M");). I'm using photo upload that uses the function imagecreatefromjpeg(); When i upload large images it gives the error "Fatal error: Allowed memory size of 83886080 bytes exhausted" What maximum size (in bytes) for the image i can restrict to the users? or the memory_limit depends on some other factor? 回答1: The memory size of 8388608 is 8 Megabytes, not 80. You may want to check whether you can still

问题 I'm aware of pdf-stamper, but I'm trying to avoid switching everything to jruby right now. I just need to "stamp" an image that I generate within the rails app (a PDF417 barcode) into a form field in the PDF document (there's an FDF; it's a document template kinda thing). I'm filling out the text-based fields by just shelling out to pdftk, so if there's a way to do it using pdftk, I'd be fine with that, but I've looked high and low for one without any luck. 回答1: How about using a barcode font

问题 I am writing an Image Viewer in C# .NET for the console. My problem is that the console font characters are not squares. And I'm treating them as pixels, this stretches the images when drawn on screen. I want to somehow read the font information about the currently used font, with width , height etc properties... I found this answer, but it seems like it just lists all the currently available fonts. I played around with this code: [StructLayout(LayoutKind.Sequential, Pack = 1)] public struct

问题 I am using the excellent modification to Python's PIL by Etienne from here. What I need is exactly what the modification does - to save a JPEG file using the same quantization tables as the original. Doing it through that modification seems elegant, I'm currently achieving that by using a hodgepodge of C code. My problem is that I get a JPEG file object in PIL, but after any modification it becomes an object of some other type. What I want is to take the image, crop it and save it with the

问题 I'm currently trying to converting the images from a .mat file to .jpg file downloaded from this site- BrainTumorDataset. All the files contained in the directory are .mat files, now I want to convert all the files in .jpg format via python for making a project(Brain Tumor Classification using Deep Neural Net) via CNN. I searched in google but then I didn't get anything from there, only some topics on how to load .mat file in python but that also didn't help me. I found an answer in

问题 I am using the excellent modification to Python's PIL by Etienne from here. What I need is exactly what the modification does - to save a JPEG file using the same quantization tables as the original. Doing it through that modification seems elegant, I'm currently achieving that by using a hodgepodge of C code. My problem is that I get a JPEG file object in PIL, but after any modification it becomes an object of some other type. What I want is to take the image, crop it and save it with the

问题 On a custom made product view page i'm working off from there is the base image (the large one) and a list of thumbnails which are other images associated with the product in the media gallery (they are just normal images and not the defined thumbnail), what i've been tasked to to is get it so that when you click on a thumbnail it'll change the base image above i've got that working however i have a problem, when i change the image the image it changes to is very pixelated one, the base image