各位大大好 小弟目前利用 mamaya3 大大的 照相機預覽的程式 在 Nexus 7 上抓到了底層回傳的 Camera preview raw data(NV21格式) 並解碼成RGB格式 我的問題是 想保留畫面上的紅色部分 其餘部分轉成灰階 類似像這張圖 http://ppt.cc/j53Q 可是 "影像處理完後，全變成藍色濾鏡的效果" 像這樣 http://ppt.cc/9NfV >"< ******************************************************************* 我的做法是除了滿足 1. pixel RGB 的 R 分量是否等於 255 2. pixel RGB 的 G 分量等於 0 3. pixel RGB 的 B 分量等於 0 的像素點不做修改 其餘的像素點通通改成灰階 也就是紅色的點保留不除理，剩餘的通通改成灰階 ******************************************************************* 以下是我在客製化View中 (就是不斷更新預覽畫面的View) 覆寫的 onDraw 方法的程式碼，總 若是有需要其餘的java檔，小弟可在上傳 感謝板上高手 ^.^ =================================================================== @Override protected void onDraw(Canvas canvas){ Log.i(tag, "onDraw() "); //image 可以是framework 傳到 Application 層的 preview raw data int size = imgWidth * imgHeight; int[] rgb = new int[imgWidth * imgHeight]; if(isCameraSet){ rgb = convertYUV420_NV21toARGB8888(image, imgWidth, imgHeight); for (int k = 0; k < size; k++) { if(Color.red(rgb[k]) == 255 && Color.green(rgb[k]) == 0 && Color.blue(rgb[k]) == 0){} else{ rgb[k] = (int) ((0.2126 * Color.red(rgb[k])) + (0.7152 * Color.green(rgb[k])) + (0.0722 * Color.blue(rgb[k]))); } } Log.i("tag", "rgb length = " + rgb.length); overlayBitmap = Bitmap.createBitmap(rgb, 0, imgWidth, imgWidth,imgHeight, Bitmap.Config.RGB_565); canvas.drawBitmap(overlayBitmap, matrix, null); overlayBitmap.recycle(); } } ======================================================================== 完整的 ViewToDraw 程式碼 package com.example.macampreviewdemo; public class ViewToDraw extends View{ public String tag = "tag"; public byte[] image; public boolean isCameraSet = false; public int imgWidth, imgHeight; Bitmap overlayBitmap; Matrix matrix; public ViewToDraw(Context context, AttributeSet attrs) { super(context, attrs); matrix = new Matrix(); } public void cameraSet(){ isCameraSet = true; } public void putImage(byte[] img){ image = img; } @Override protected void onDraw(Canvas canvas){ Log.i(tag, "onDraw() "); //image 可以是framework 傳到 Application 層的 preview raw data int size = imgWidth * imgHeight; int[] rgb = new int[imgWidth * imgHeight]; if(isCameraSet){ rgb = convertYUV420_NV21toARGB8888(image, imgWidth, imgHeight); for (int k = 0; k < size; k++) { if(Color.red(rgb[k]) == 255 && Color.green(rgb[k]) == 0 && Color.blue(rgb[k]) == 0){} else{ rgb[k] = (int) ((0.2126 * Color.red(rgb[k])) + (0.7152 * Color.green(rgb[k])) + (0.0722 * Color.blue(rgb[k]))); } } Log.i("tag", "rgb length = " + rgb.length); overlayBitmap = Bitmap.createBitmap(rgb, 0, imgWidth, imgWidth, imgHeight, Bitmap.Config.RGB_565); canvas.drawBitmap(overlayBitmap, matrix, null); overlayBitmap.recycle(); } } /** * Converts YUV420 NV21 to ARGB8888 * * @param data byte array on YUV420 NV21 format. * @param width pixels width * @param height pixels height * @return a ARGB8888 pixels int array. Where each int is a pixels ARGB. */ public static int[] convertYUV420_NV21toARGB8888(byte[] data, int width, int height) { int size = width*height; int offset = size; int[] pixels = new int[size]; int u, v, y1, y2, y3, y4; // i along Y and the final pixels // k along pixels U and V for(int i=0, k=0; i < size; i+=2, k+=1) { y1 = data[i ]&0xff; y2 = data[i+1]&0xff; y3 = data[width+i ]&0xff; y4 = data[width+i+1]&0xff; v = data[offset+k ]&0xff; u = data[offset+k+1]&0xff; v = v-128; u = u-128; pixels[i ] = convertYUVtoARGB(y1, u, v); pixels[i+1] = convertYUVtoARGB(y2, u, v); pixels[width+i ] = convertYUVtoARGB(y3, u, v); pixels[width+i+1] = convertYUVtoARGB(y4, u, v); if (i!=0 && (i+2)%width==0) i+=width; } return pixels; } private static int convertYUVtoARGB(int y, int u, int v) { int r,g,b; r = y + (int)(1.402f*u); g = y - (int)(0.344f*v + 0.714f*u); b = y + (int)(1.772f*v); r = r>255? 255 : r<0 ? 0 : r; g = g>255? 255 : g<0 ? 0 : g; b = b>255? 255 : b<0 ? 0 : b; return 0xff000000 | (r<<16) | (g<<8) | b; } } --

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