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问题 This is one of those "pretty sure we found the answer, but hoping we're wrong" questions. We are looking at a steganography problem and it's not pretty. Situation: We have a series of images. We want to mark them (watermark) so the watermarks survive a series of conditions. The kicker is, we are using a lossfull format, JPG, rather than lossless such as PNG. Our watermarks need to survive screenshotting and, furthermore, need to be invisible to the naked eye. Finally, they need contain at

问题 This is one of those "pretty sure we found the answer, but hoping we're wrong" questions. We are looking at a steganography problem and it's not pretty. Situation: We have a series of images. We want to mark them (watermark) so the watermarks survive a series of conditions. The kicker is, we are using a lossfull format, JPG, rather than lossless such as PNG. Our watermarks need to survive screenshotting and, furthermore, need to be invisible to the naked eye. Finally, they need contain at

问题 I am not sure what I am exactly doing here so please give some advise and forgive the mistakes. I have a image byte[] called idCardImage and I did the following to convert it to a String: String s = new String(idCardImage); And it prints out like this: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAEHUlEQVQ4TzWUW49VRRCFv6rq3ufMmTNn.... Did some search online and it seems this image is in a png format with base 64 encoded. What I need to do is to convert it to a jpeg

问题 Every image in my Java Swing Programs will appear in low quality as shown below: As you can see from the image, it is not just images I am having problem with, it's graphics in general displaying like this. In the right portion you can see the problem reflected to a JFreeChart Graphic. Has anyone else had this problem, is it related to the graphics card or maybe windows DPI? The same programs will render perfectly fine in other machines so I am pretty sure it is not related to the code. 回答1:

问题 Every image in my Java Swing Programs will appear in low quality as shown below: As you can see from the image, it is not just images I am having problem with, it's graphics in general displaying like this. In the right portion you can see the problem reflected to a JFreeChart Graphic. Has anyone else had this problem, is it related to the graphics card or maybe windows DPI? The same programs will render perfectly fine in other machines so I am pretty sure it is not related to the code. 回答1:

问题 I am trying to write on image with hindi language. I am using node-canvas library. There is some problem with my output. Can someone help me ? const { createCanvas, loadImage, registerFont} = require('canvas') const canvas = createCanvas(400, 400) const ctx = canvas.getContext('2d') var str= "यह. मिसिसिपी है"; console.log(str); loadImage('missisippi.jpg').then((image) => { console.log(image); ctx.drawImage(image, 0 , 0, 400, 400); ctx.fillText(str,100,40); var body = canvas.toDataURL(),

问题 I am trying to write on image with hindi language. I am using node-canvas library. There is some problem with my output. Can someone help me ? const { createCanvas, loadImage, registerFont} = require('canvas') const canvas = createCanvas(400, 400) const ctx = canvas.getContext('2d') var str= "यह. मिसिसिपी है"; console.log(str); loadImage('missisippi.jpg').then((image) => { console.log(image); ctx.drawImage(image, 0 , 0, 400, 400); ctx.fillText(str,100,40); var body = canvas.toDataURL(),

问题 I am trying to write on image with hindi language. I am using node-canvas library. There is some problem with my output. Can someone help me ? const { createCanvas, loadImage, registerFont} = require('canvas') const canvas = createCanvas(400, 400) const ctx = canvas.getContext('2d') var str= "यह. मिसिसिपी है"; console.log(str); loadImage('missisippi.jpg').then((image) => { console.log(image); ctx.drawImage(image, 0 , 0, 400, 400); ctx.fillText(str,100,40); var body = canvas.toDataURL(),

问题 I annotated images using PixelAnnotationTool provided here: https://github.com/abreheret/PixelAnnotationTool and using the provided dictionary: { "labels": { "unlabeled": { "categorie": "void", "color": [ 0, 0, 0 ], "id": 0, "id_categorie": 0, "name": "unlabeled" }, "bicycle_motorcycle": { "categorie": "bicycle_motorcycle", "color": [ 119, 11, 32 ], "id": 1, "id_categorie": 1, "name": "bicycle_motorcycle" }, "bus": { "categorie": "bus", "color": [ 102, 51, 0 ], "id": 2, "id_categorie": 2,

问题 I annotated images using PixelAnnotationTool provided here: https://github.com/abreheret/PixelAnnotationTool and using the provided dictionary: { "labels": { "unlabeled": { "categorie": "void", "color": [ 0, 0, 0 ], "id": 0, "id_categorie": 0, "name": "unlabeled" }, "bicycle_motorcycle": { "categorie": "bicycle_motorcycle", "color": [ 119, 11, 32 ], "id": 1, "id_categorie": 1, "name": "bicycle_motorcycle" }, "bus": { "categorie": "bus", "color": [ 102, 51, 0 ], "id": 2, "id_categorie": 2,