Threshold

指定常数作为阈值，给向量中的元素做设阈操作。

接口中包含参数relOp，该参数指定了比较操作的类型，它的取值是HMPP_CMP_LT（小于）和HMPP_CMP_GT（大于）。

计算公式如下：

• 有实数序列src，且relOP = HMPP_CMP_LT，则

  

• 有实数序列src，且relOP = HMPP_CMP_GT，则

  

• 有复数序列src，且relOP = HMPP_CMP_LT，则

  

• 有复数序列src，且relOP = HMPP_CMP_GT，则

  

函数接口声明如下：

• 整型数的操作：

  HmppResult HMPPS_Threshold_16s(const int16_t* src, int16_t* dst, int32_t len, int16_t level, HmppCmpOp relOp);

• 浮点数的操作：

  HmppResult HMPPS_Threshold_32f(const float* src, float* dst, int32_t len, float level, HmppCmpOp relOp);

  HmppResult HMPPS_Threshold_64f(const double* src, double* dst, int32_t len, double level, HmppCmpOp relOp);

  HmppResult HMPPS_Threshold_32fc(const Hmpp32fc* src, Hmpp32fc* dst, int32_t len, float level, HmppCmpOp relOp);

• 整型数的原址操作：

  HmppResult HMPPS_Threshold_16s_I(int16_t* srcDst, int32_t len, int16_t level, HmppCmpOp relOp);

• 浮点数的原址操作：

  HmppResult HMPPS_Threshold_32f_I(float* srcDst, int32_t len, float level, HmppCmpOp relOp);

  HmppResult HMPPS_Threshold_64f_I(double* srcDst, int32_t len, double level, HmppCmpOp relOp);

  HmppResult HMPPS_Threshold_32fc_I(Hmpp32fc* srcDst, int32_t len, float level, HmppCmpOp relOp);

#define BUFFER_SIZE_T 10
void ThresholdExample(void) {
  float src[BUFFER_SIZE_T] = {-1.64, -1.63, -1.09, 0.71, 3.20,
                              -0.43, -0.41, 4.83,  5.36, 4.40};
  float dst1[BUFFER_SIZE_T] = {0.00};
  float dst2[BUFFER_SIZE_T] = {0.00};
  HmppResult result;

  result = HMPPS_Threshold_32f(src, dst1, BUFFER_SIZE_T, 3.14, HMPP_CMP_LT);
  printf("Threshold1: result = %d\n", result);
  if (result != HMPP_STS_NO_ERR) {
    return;
  }
  printf("dst1 =");
  for (int i = 0; i < BUFFER_SIZE_T; i++) {
    printf(" %.2f", dst1[i]);
  }

  result = HMPPS_Threshold_32f(src, dst2, BUFFER_SIZE_T, 3.14, HMPP_CMP_GT);
  printf("\nThreshold2: result = %d\n", result);
  if (result != HMPP_STS_NO_ERR) {
    return;
  }
  printf("dst2 =");
  for (int i = 0; i < BUFFER_SIZE_T; i++) {
    printf(" %.2f", dst2[i]);
  }
  printf("\n");
}

Threshold1: result = 0
dst1 = 3.14 3.14 3.14 3.14 3.20 3.14 3.14 4.83 5.36 4.40
Threshold2: result = 0
dst2 = -1.64 -1.63 -1.09 0.71 3.14 -0.43 -0.41 3.14 3.14 3.14