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Description
从sdcard上选择一张图片输入,转换为bitmap,
Bitmap bm = BitmapFactory.decodeFile("mnt/sdcard/test_face.jpeg");
int width = bm.getWidth();
int height = bm.getHeight();
byte[] data = bitmapToNv21(bm,width,height);
FaceTracking.getInstance().Update(data, height, width);
然后将bitmap转换为nv21格式,但出现报错。
nv21转换函数:
/**
* Bitmap转化为ARGB数据,再转化为NV21数据
*
* @param src 传入ARGB_8888的Bitmap
* @param width NV21图像的宽度
* @param height NV21图像的高度
* @return nv21数据
*/
public static byte[] bitmapToNv21(Bitmap src, int width, int height) {
if (src != null && src.getWidth() >= width && src.getHeight() >= height) {
int[] argb = new int[width * height];
src.getPixels(argb, 0, width, 0, 0, width, height);
return argbToNv21(argb, width, height);
} else {
return null;
}
}
/**
* ARGB数据转化为NV21数据
*
* @param argb argb数据
* @param width 宽度
* @param height 高度
* @return nv21数据
*/
private static byte[] argbToNv21(int[] argb, int width, int height) {
int frameSize = width * height;
int yIndex = 0;
int uvIndex = frameSize;
int index = 0;
byte[] nv21 = new byte[width * height * 3 / 2];
for (int j = 0; j < height; ++j) {
for (int i = 0; i < width; ++i) {
int R = (argb[index] & 0xFF0000) >> 16;
int G = (argb[index] & 0x00FF00) >> 8;
int B = argb[index] & 0x0000FF;
int Y = (66 * R + 129 * G + 25 * B + 128 >> 8) + 16;
int U = (-38 * R - 74 * G + 112 * B + 128 >> 8) + 128;
int V = (112 * R - 94 * G - 18 * B + 128 >> 8) + 128;
nv21[yIndex++] = (byte) (Y < 0 ? 0 : (Y > 255 ? 255 : Y));
if (j % 2 == 0 && index % 2 == 0 && uvIndex < nv21.length - 2) {
nv21[uvIndex++] = (byte) (V < 0 ? 0 : (V > 255 ? 255 : V));
nv21[uvIndex++] = (byte) (U < 0 ? 0 : (U > 255 ? 255 : U));
}
++index;
}
}
return nv21;
}
通过该方法转换后,sdk报错:
Assertion failed (sz.width % 2 == 0 && sz.height % 3 == 0) in cv::impl::{anonymous}::CvtHelper<VScn, VDcn, VDepth, sizePolicy>::CvtHelper(cv::InputArray, cv::OutputArray, int) [with VScn = cv::impl::{anonymous}::Set<1>; VDcn = cv::impl::{anonymous}::Set<3, 4>; VDepth = cv::impl::{anonymous}::Set<0>; cv::impl::{anonymous}::SizePolicy sizePolicy = (cv::impl::<unnamed>::SizePolicy)1u; cv::InputArray = const cv::_InputArray&; cv::OutputArray = const cv::_OutputArray&], file /build/3_4_pack-android/opencv/modules/imgproc/src/color.simd_helpers.hpp, line 104
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