Hello,<\/p>\n
This is a small exercice of Multimedia class (INE5431). We need to implement: <\/p>\n
\n1) Transform the image to GrayScale
\n2) Generate one image to each component color (R\/G\/B)
\n3) Transform the GrayScale image to binary\n<\/p><\/blockquote>\nTo transform RGB to GrayScale we need to use this expression: <\/p>\n
Y = 0.3R + 0.59G + 0.11B;<\/p><\/blockquote>\n
And them, to convert the GrayScale to Binary <\/p>\n
if (Y > 127) {b = 1; } else { b = 0; }<\/p><\/blockquote>\n
If we want just one color component, we need to get all image pixels and leave just the component that we want, or just copy the component to a new image.<\/p>\n
In this project, we access an image and we have some functions to do what we want, convertion to GrayScale, Binary, and Component RGB. From the source image, we create a buffer image of the same size to all images and we create a for to go over all pixels and make the transformation and put it to the new buffer image. <\/p>\n
<\/p>\n
GrayScale method, receive a Bufferedmage and convert it to GrayScale.
\n[code lang=”java”]
\npublic static BufferedImage criaImagemCinza(BufferedImage imgJPEG) {
\n\t\t\/\/ Create a new buffer to BYTE_GRAY
\n\t\tBufferedImage img = new BufferedImage(imgJPEG.getWidth(), imgJPEG.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
\n\t\tWritableRaster raster = img.getRaster();
\n\t\tWritableRaster rasterJPEG = imgJPEG.getRaster();
\n\t\t\/\/ Foreach pixel we transofrm it to Gray Scale and put it on the same image
\n\t\tfor(int h=0;h<256;h++)\n\t\t\tfor(int w=0;w<256;w++) {\n\t\t\t\tint[] p = new int[4];\n\t\t\t\trasterJPEG.getPixel(w, h, p);\n\t\t\t\tp[0] = (int) (0.3 * p[0]); \n\t\t\t\tp[1] = (int) (0.59 * p[1]);\n\t\t\t\tp[2] = (int) (0.11 * p[2]);\n\t\t\t\tint y = p[0] + p[1] + p[2];\n\t\t\t\traster.setSample(w,h,0,y);\n\t\t\t}\n\t\treturn img;\n\t}\n[\/code]\n\nBinary Image method, receive a Bufferedmage and convert it to Binary.\n[code lang=\"java\"]\n\tpublic static BufferedImage criaImagemBinaria(BufferedImage imgJPEG) {\n\t\t\/\/ Create a new Binary Buffer\n\t\tBufferedImage img = new BufferedImage(imgJPEG.getWidth(), imgJPEG.getHeight(), BufferedImage.TYPE_BYTE_BINARY);\n\t\tWritableRaster raster = img.getRaster();\n\t\tWritableRaster rasterPB = criaImagemCinza(imgJPEG).getRaster();\n\t\t\/\/ Foreach pixel check if the new one must be white or black \n\t\tfor(int h=0;h<256;h++)\n\t\t\tfor(int w=0;w<256;w++) {\n\t\t\t\tint[] p = new int[1];\n\t\t\t\trasterPB.getPixel(w, h, p);\n\t\t\t\tif(p[0] > 127) {
\n\t\t\t\t\traster.setSample(w, h, 0, 1);
\n\t\t\t\t} else {
\n\t\t\t\t\traster.setSample(w, h, 0, 0);
\n\t\t\t\t}
\n\t\t\t}
\n\t\treturn img;
\n\t}
\n[\/code]<\/p>\nRGB Image method, receive a Bufferedmage and a Type (0 – red, 1 – green, 2 – blue) and convert it to RGB Component that is used as parameter.
\n[code lang=”java”]
\npublic static BufferedImage criaImagemRGB(BufferedImage imgJPEG, int tipo) {
\n\t\t\/\/ Create a new RGB Buffer
\n\t\tBufferedImage img = new BufferedImage(imgJPEG.getWidth(), imgJPEG.getHeight(), BufferedImage.TYPE_INT_RGB);<\/p>\n\t\tWritableRaster rasterT = img.getRaster();
\n\t\tWritableRaster raster = imgJPEG.getRaster();
\n\t\t\/\/ Foreach pixel just use the component that is passed as parameter.
\n\t\tfor(int h=0;h<256;h++)\n\t\t\tfor(int w=0;w<256;w++) {\n\t\t\t\tint[] p = new int[4];\n\t\t\t\traster.getPixel(w,h,p);\n\t\t\t\trasterT.setSample(w,h,tipo-1,p[tipo-1]);\n\t\t\t} \n\t\treturn img;\n\t}\n[\/code]\n\nManipulate images to GrayScale, Binary and RGB Components<\/a><\/p>\nMatheus<\/p>\n
<\/p>","protected":false},"excerpt":{"rendered":"
Hello, This is a small exercice of Multimedia class (INE5431). We need to implement: 1) Transform the image to GrayScale 2) Generate one image to<\/p>\n