dspi_dotprod_s16_ansi.c File Reference

#include "dspi_dotprod.h"

Include dependency graph for dspi_dotprod_s16_ansi.c:

Go to the source code of this file.

Functions
esp_err_t	dspi_dotprod_s16_ansi (image2d_t *in_image, image2d_t *filter, int16_t *out_value, int count_x, int count_y, int shift)
	dot product of two images Dot product calculation for two floating point images: out_value += image[i...] * src2[i*...]); i= [0..count_x*count_y) The extension (_ansi) use ANSI C and could be compiled and run on any platform. The extension (_ae32) is optimized for ESP32 chip.

Function Documentation

dspi_dotprod_s16_ansi()

esp_err_t dspi_dotprod_s16_ansi	(	image2d_t *	in_image,
		image2d_t *	filter,
		int16_t *	out_value,
		int	count_x,
		int	count_y,
		int	shift )

dot product of two images Dot product calculation for two floating point images: out_value += image[i...] * src2[i*...]); i= [0..count_x*count_y) The extension (_ansi) use ANSI C and could be compiled and run on any platform. The extension (_ae32) is optimized for ESP32 chip.

Parameters

[in]	in_image	descriptor of the image
[in]	filter	descriptor of the filter
[out]	out_value	pointer to the output value
[in]	count_x	amount of samples by X axis (count_x*step_X <= widdth)
[in]	count_y	amount of samples by Y axis (count_y*step_Y <= height)
[in]	shift	- result shift to right, by default must be 15 for int16_t or 7 for int8_t

Returns

• ESP_OK on success
• One of the error codes from DSP library

Definition at line 17 of file dspi_dotprod_s16_ansi.c.

{
    if (in_image->step_x * count_x > in_image->stride_x) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (in_image->step_y * count_y > in_image->stride_y) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (filter->step_x * count_x > filter->stride_x) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (filter->step_y * count_y > filter->stride_y) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
 
    int16_t *i_data =  (int16_t *)in_image->data;
    int16_t *f_data =  (int16_t *)filter->data;
    int i_step = in_image->stride_x * in_image->step_y;
    int f_step = filter->stride_x * filter->step_y;
 
    int64_t acc = 0;
    for (int y = 0; y < count_y; y++) {
        for (int x = 0; x < count_x; x++) {
            acc += (int32_t)i_data[in_image->step_x * x] * (int32_t)f_data[filter->step_x * x];
        }
        i_data += i_step;
        f_data += f_step;
    }
    acc += 1 << (shift - 1);    // round operation
    acc >>= shift;
    *out_value = acc;
    return ESP_OK;
}

References image2d_s::data, ESP_ERR_DSP_PARAM_OUTOFRANGE, ESP_OK, image2d_s::step_x, image2d_s::step_y, image2d_s::stride_x, image2d_s::stride_y, x, and y.