Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>When you set-up the camera you will need to set the preview size and the preview format. Here is some sample code to give the rough idea:</p> <pre><code>int previewFormat = 0; for (int format : parameters.getSupportedPreviewFormats()) { if (format == FORMAT_NV21) { previewFormat = FORMAT_NV21; } else if (previewFormat == 0 &amp;&amp; (format == FORMAT_JPEG || format == FORMAT_RGB_565)) { previewFormat = format; } } // TODO: Iterate on supported preview sizes and pick best one parameters.setPreviewSize(previewSize.width, previewSize.height); if (previewFormat != 0) { parameters.setPreviewFormat(previewFormat); } else { // Error on unsupported format } </code></pre> <p>Now in the callback you can do something like:</p> <pre><code>@Override public void onPreviewFrame(byte[] data, Camera camera) { Bitmnap bitmap; if (previewFormat == FORMAT_NV21) { int[] previewPixels = new int[previewSize.width * previewSize.height]; decodeYUV420SP(previewPixels, data, previewSize.width, previewSize.height); bitmap = Bitmap.createBitmap(rgbPixels, previewSize.width, previewSize.height, Bitmap.Config.RGB_565); } else if (previewFormat == FORMAT_JPEG || previewFormat == FORMAT_RGB_565) { // RGB565 and JPEG BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inDither = true; opts.inPreferredConfig = Bitmap.Config.RGB_565; bitmap = BitmapFactory.decodeByteArray(data, 0, data.length, opts); } } </code></pre> <p>And finally, the conversion</p> <pre><code> static void decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) { final int frameSize = width * height; for (int j = 0, yp = 0; j &lt; height; j++) { int uvp = frameSize + (j &gt;&gt; 1) * width, u = 0, v = 0; for (int i = 0; i &lt; width; i++, yp++) { int y = (0xff &amp; ((int) yuv420sp[yp])) - 16; if (y &lt; 0) y = 0; if ((i &amp; 1) == 0) { v = (0xff &amp; yuv420sp[uvp++]) - 128; u = (0xff &amp; yuv420sp[uvp++]) - 128; } int y1192 = 1192 * y; int r = (y1192 + 1634 * v); int g = (y1192 - 833 * v - 400 * u); int b = (y1192 + 2066 * u); if (r &lt; 0) r = 0; else if (r &gt; 262143) r = 262143; if (g &lt; 0) g = 0; else if (g &gt; 262143) g = 262143; if (b &lt; 0) b = 0; else if (b &gt; 262143) b = 262143; rgb[yp] = 0xff000000 | ((r &lt;&lt; 6) &amp; 0xff0000) | ((g &gt;&gt; 2) &amp; 0xff00) | ((b &gt;&gt; 10) &amp; 0xff); } } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POAndroid way to use Bitmaps from Camera.setPreviewCallback
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USyoah
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POAndroid way to use Bitmaps from Camera.setPreviewCallback
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COthanks, I do this, but with facedetector, this is very slow, and using 98% of cpu usage...so I have to use openCV, thanks
      singulars
      1. PO
      1. USuser2007094
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload