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64 lines
1.3 KiB
64 lines
1.3 KiB
#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <float.h>
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#include "vec_match.h"
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#define SQUARE(a) ((a)*(a))
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bool vec_match(const float *data,
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const float *ref,
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uint32_t length,
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uint8_t drift_x,
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float offset_y,
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float *envl_match_error,
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float *abs_match_error)
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{
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int a, b;
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int err_cnt = 0;
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float env_err = 0;
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float abs_err = 0;
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for (int i = 0; i < (int)length; i++) {
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float peak = FLT_MIN;
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float base = FLT_MAX;
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// find highest value in the surrounding drift_x points
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a = i - drift_x;
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b = i + drift_x;
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if (a < 0) a = 0;
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if (b >= (int)length) b = length - 1;
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for (int j = a; j <= b; j++) {
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if (peak < ref[j]) peak = ref[j];
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if (base > ref[j]) base = ref[j];
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}
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// apply drift_y
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peak += offset_y;
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base -= offset_y;
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abs_err += SQUARE(ref[i] - data[i]);
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if (data[i] >= base && data[i] <= peak) {
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// within limits
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continue;
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} else {
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//printf("data[%d] out of range: %f, [%f ; %f]\n", i, data[i], base, peak);
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if (data[i] < base) env_err += SQUARE(base - data[i]);
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if (data[i] > peak) env_err += SQUARE(data[i] - peak);
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err_cnt++;
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}
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}
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// write error values to provided fields
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if (envl_match_error != NULL) *envl_match_error = env_err;
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if (abs_match_error != NULL) *abs_match_error = abs_err;
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return err_cnt == 0;
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}
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