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dl_image.cpp
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dl_image.cpp
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#include "dl_image.hpp"
#include "esp_log.h"
#include <assert.h>
#include <stdio.h>
namespace dl {
namespace image {
template <typename T>
void crop_and_resize(T *dst_image,
int dst_width,
int dst_channel,
int dst_y_start,
int dst_y_end,
int dst_x_start,
int dst_x_end,
uint16_t *src_image,
int src_height,
int src_width,
int src_channel,
int src_y_start,
int src_y_end,
int src_x_start,
int src_x_end,
resize_type_t resize_type,
bool byte_swap,
bool rgb_swap)
{
assert(src_channel == 3);
assert(dst_y_start >= 0);
assert(dst_x_start >= 0);
float scale_y = (float)(src_y_end - src_y_start) / (dst_y_end - dst_y_start);
float scale_x = (float)(src_x_end - src_x_start) / (dst_x_end - dst_x_start);
int temp[13];
switch (resize_type) {
case IMAGE_RESIZE_BILINEAR:
for (size_t y = dst_y_start; y < dst_y_end; y++) {
float ratio_y[2];
ratio_y[0] = (float)(((y - dst_y_start) + 0.5) * scale_y - 0.5); // y
int src_y = (int)ratio_y[0]; // y1
ratio_y[0] -= src_y; // y - y1
src_y += src_y_start;
if (src_y < 0) {
ratio_y[0] = 0;
src_y = 0;
} else if (src_y > src_height - 2) {
ratio_y[0] = 0;
src_y = src_height - 2;
}
ratio_y[1] = 1 - ratio_y[0]; // y2 - y
int _dst_i = y * dst_width;
int _src_row_0 = src_y * src_width;
int _src_row_1 = _src_row_0 + src_width;
for (size_t x = dst_x_start; x < dst_x_end; x++) {
float ratio_x[2];
ratio_x[0] = (float)(((x - dst_x_start) + 0.5) * scale_x - 0.5); // x
int src_x = (int)ratio_x[0]; // x1
ratio_x[0] -= src_x; // x - x1
src_x += src_x_start;
if (src_x < 0) {
ratio_x[0] = 0;
src_x = 0;
} else if (src_x > src_width - 2) {
ratio_x[0] = 0;
src_x = src_width - 2;
}
ratio_x[1] = 1 - ratio_x[0]; // x2 - x
int dst_i = (_dst_i + x) * dst_channel;
int src_row_0 = _src_row_0 + src_x;
int src_row_1 = _src_row_1 + src_x;
convert_pixel_rgb565_to_rgb888(src_image[src_row_0], temp, byte_swap);
convert_pixel_rgb565_to_rgb888(src_image[src_row_0 + 1], temp + 3, byte_swap);
convert_pixel_rgb565_to_rgb888(src_image[src_row_1], temp + 6, byte_swap);
convert_pixel_rgb565_to_rgb888(src_image[src_row_1 + 1], temp + 9, byte_swap);
if (dst_channel == 3) {
if (rgb_swap) {
dst_image[dst_i] = (int)(temp[2] * ratio_x[1] * ratio_y[1] //
+ temp[5] * ratio_x[0] * ratio_y[1] //
+ temp[8] * ratio_x[1] * ratio_y[0] //
+ temp[11] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
dst_image[dst_i + 1] = (int)(temp[1] * ratio_x[1] * ratio_y[1] //
+ temp[4] * ratio_x[0] * ratio_y[1] //
+ temp[7] * ratio_x[1] * ratio_y[0] //
+ temp[10] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
dst_image[dst_i + 2] = (int)(temp[0] * ratio_x[1] * ratio_y[1] //
+ temp[3] * ratio_x[0] * ratio_y[1] //
+ temp[6] * ratio_x[1] * ratio_y[0] //
+ temp[9] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
} else {
dst_image[dst_i] = (int)(temp[0] * ratio_x[1] * ratio_y[1] //
+ temp[3] * ratio_x[0] * ratio_y[1] //
+ temp[6] * ratio_x[1] * ratio_y[0] //
+ temp[9] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
dst_image[dst_i + 1] = (int)(temp[1] * ratio_x[1] * ratio_y[1] //
+ temp[4] * ratio_x[0] * ratio_y[1] //
+ temp[7] * ratio_x[1] * ratio_y[0] //
+ temp[10] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
dst_image[dst_i + 2] = (int)(temp[2] * ratio_x[1] * ratio_y[1] //
+ temp[5] * ratio_x[0] * ratio_y[1] //
+ temp[8] * ratio_x[1] * ratio_y[0] //
+ temp[11] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
}
} else if (dst_channel == 1) // RGB -> Gray
{
int blue, green, red;
if (rgb_swap) {
blue = (int)(temp[2] * ratio_x[1] * ratio_y[1] //
+ temp[5] * ratio_x[0] * ratio_y[1] //
+ temp[8] * ratio_x[1] * ratio_y[0] //
+ temp[11] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
green = (int)(temp[1] * ratio_x[1] * ratio_y[1] //
+ temp[4] * ratio_x[0] * ratio_y[1] //
+ temp[7] * ratio_x[1] * ratio_y[0] //
+ temp[10] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
red = (int)(temp[0] * ratio_x[1] * ratio_y[1] //
+ temp[3] * ratio_x[0] * ratio_y[1] //
+ temp[6] * ratio_x[1] * ratio_y[0] //
+ temp[9] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
} else {
blue = (int)(temp[0] * ratio_x[1] * ratio_y[1] //
+ temp[3] * ratio_x[0] * ratio_y[1] //
+ temp[6] * ratio_x[1] * ratio_y[0] //
+ temp[9] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
green = (int)(temp[1] * ratio_x[1] * ratio_y[1] //
+ temp[4] * ratio_x[0] * ratio_y[1] //
+ temp[7] * ratio_x[1] * ratio_y[0] //
+ temp[10] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
red = (int)(temp[2] * ratio_x[1] * ratio_y[1] //
+ temp[5] * ratio_x[0] * ratio_y[1] //
+ temp[8] * ratio_x[1] * ratio_y[0] //
+ temp[11] * ratio_x[0] * ratio_y[0] //
+ 0.5); //
}
dst_image[dst_i] = convert_pixel_rgb888_to_gray(red, green, blue);
} else {
printf("Not implement dst_channel = %d\n", dst_channel);
}
}
}
break;
case IMAGE_RESIZE_MEAN:
for (int y = dst_y_start; y < dst_y_end; y++) {
int _dst_i = y * dst_width;
float src_y = rintf((y - dst_y_start) * scale_y + src_y_start);
src_y = DL_CLIP(src_y, 0, src_height - 2);
float _src_row_0 = src_y * src_width;
float _src_row_1 = _src_row_0 + src_width;
for (int x = dst_x_start; x < dst_x_end; x++) {
int dst_i = (_dst_i + x) * dst_channel;
float src_x = rintf((x - dst_x_start) * scale_x) + src_x_start;
src_x = DL_CLIP(src_x, 0, src_width - 2);
int src_row_0 = _src_row_0 + src_x;
int src_row_1 = _src_row_1 + src_x;
convert_pixel_rgb565_to_rgb888(src_image[src_row_0], temp, byte_swap);
convert_pixel_rgb565_to_rgb888(src_image[src_row_0 + 1], temp + 3, byte_swap);
convert_pixel_rgb565_to_rgb888(src_image[src_row_1], temp + 6, byte_swap);
convert_pixel_rgb565_to_rgb888(src_image[src_row_1 + 1], temp + 9, byte_swap);
if (dst_channel == 3) {
if (rgb_swap) {
dst_image[dst_i] = (temp[2] + temp[5] + temp[8] + temp[11]) >> 2; // blue
dst_image[dst_i + 1] = (temp[1] + temp[4] + temp[7] + temp[10]) >> 2; // green
dst_image[dst_i + 2] = (temp[0] + temp[3] + temp[6] + temp[9]) >> 2; // red
} else {
dst_image[dst_i] = (temp[0] + temp[3] + temp[6] + temp[9]) >> 2; // blue
dst_image[dst_i + 1] = (temp[1] + temp[4] + temp[7] + temp[10]) >> 2; // green
dst_image[dst_i + 2] = (temp[2] + temp[5] + temp[8] + temp[11]) >> 2; // red
}
} else if (dst_channel == 1) {
int blue, green, red;
if (rgb_swap) {
blue = (temp[2] + temp[5] + temp[8] + temp[11]) >> 2;
green = (temp[1] + temp[4] + temp[7] + temp[10]) >> 2;
red = (temp[0] + temp[3] + temp[6] + temp[9]) >> 2;
} else {
blue = (temp[0] + temp[3] + temp[6] + temp[9]) >> 2;
green = (temp[1] + temp[4] + temp[7] + temp[10]) >> 2;
red = (temp[2] + temp[5] + temp[8] + temp[11]) >> 2;
}
dst_image[dst_i] = convert_pixel_rgb888_to_gray(red, green, blue);
} else {
printf("Not implement dst_channel = %d\n", dst_channel);
}
}
}
break;
case IMAGE_RESIZE_NEAREST:
for (size_t y = dst_y_start; y < dst_y_end; y++) {
int _dst_i = y * dst_width;
float src_y = rintf((y - dst_y_start) * scale_y + src_y_start);
src_y = DL_CLIP(src_y, 0, src_height - 1);
float _src_i = src_y * src_width;
for (size_t x = dst_x_start; x < dst_x_end; x++) {
int dst_i = (_dst_i + x) * dst_channel;
float src_x = rintf((x - dst_x_start) * scale_x) + src_x_start;
src_x = DL_CLIP(src_x, 0, src_width - 1);
int src_i = _src_i + src_x;
convert_pixel_rgb565_to_rgb888(src_image[src_i], temp, byte_swap);
if (dst_channel == 3) {
if (rgb_swap) {
dst_image[dst_i] = temp[2];
dst_image[dst_i + 1] = temp[1];
dst_image[dst_i + 2] = temp[0];
} else {
dst_image[dst_i] = temp[0];
dst_image[dst_i + 1] = temp[1];
dst_image[dst_i + 2] = temp[2];
}
} else if (dst_channel == 1) // RGB -> Gray
{
int blue, green, red;
if (rgb_swap) {
blue = temp[2];
green = temp[1];
red = temp[0];
} else {
blue = temp[0];
green = temp[1];
red = temp[2];
}
dst_image[dst_i] = convert_pixel_rgb888_to_gray(red, green, blue);
} else {
printf("Not implement dst_channel = %d\n", dst_channel);
}
}
}
break;
default:
printf("Not implement image_resize_type = %d\n", resize_type);
break;
}
}
template void crop_and_resize(uint8_t *dst_image,
int dst_width,
int dst_channel,
int dst_y_start,
int dst_y_end,
int dst_x_start,
int dst_x_end,
uint16_t *src_image,
int src_height,
int src_width,
int src_channel,
int src_y_start,
int src_y_end,
int src_x_start,
int src_x_end,
resize_type_t resize_type,
bool rgb_swap,
bool byte_swap);
template void crop_and_resize(int16_t *dst_image,
int dst_width,
int dst_channel,
int dst_y_start,
int dst_y_end,
int dst_x_start,
int dst_x_end,
uint16_t *src_image,
int src_height,
int src_width,
int src_channel,
int src_y_start,
int src_y_end,
int src_x_start,
int src_x_end,
resize_type_t resize_type,
bool rgb_swap,
bool byte_swap);
template void crop_and_resize(int8_t *dst_image,
int dst_width,
int dst_channel,
int dst_y_start,
int dst_y_end,
int dst_x_start,
int dst_x_end,
uint16_t *src_image,
int src_height,
int src_width,
int src_channel,
int src_y_start,
int src_y_end,
int src_x_start,
int src_x_end,
resize_type_t resize_type,
bool rgb_swap,
bool byte_swap);
template <typename T>
void crop_and_resize(T *dst_image,
int dst_width,
int dst_channel,
int dst_y_start,
int dst_y_end,
int dst_x_start,
int dst_x_end,
uint8_t *src_image,
int src_height,
int src_width,
int src_channel,
int src_y_start,
int src_y_end,
int src_x_start,
int src_x_end,
resize_type_t resize_type,
bool rgb_swap)
{
assert(dst_y_start >= 0);
assert(dst_x_start >= 0);
float scale_y = (float)(src_y_end - src_y_start) / (dst_y_end - dst_y_start);
float scale_x = (float)(src_x_end - src_x_start) / (dst_x_end - dst_x_start);
int temp;
switch (resize_type) {
case IMAGE_RESIZE_BILINEAR:
for (size_t y = dst_y_start; y < dst_y_end; y++) {
float ratio_y[2];
ratio_y[0] = (float)(((y - dst_y_start) + 0.5) * scale_y - 0.5); // y
int src_y = (int)ratio_y[0]; // y1
ratio_y[0] -= src_y; // y - y1
src_y += src_y_start;
if (src_y < 0) {
ratio_y[0] = 0;
src_y = 0;
}
if (src_y > src_height - 2) {
ratio_y[0] = 0;
src_y = src_height - 2;
}
ratio_y[1] = 1 - ratio_y[0]; // y2 - y
int _dst_i = y * dst_width;
int _src_row_0 = src_y * src_width;
int _src_row_1 = _src_row_0 + src_width;
for (size_t x = dst_x_start; x < dst_x_end; x++) {
float ratio_x[2];
ratio_x[0] = (float)(((x - dst_x_start) + 0.5) * scale_x - 0.5); // x
int src_x = (int)ratio_x[0]; // x1
ratio_x[0] -= src_x; // x - x1
src_x += src_x_start;
if (src_x < 0) {
ratio_x[0] = 0;
src_x = 0;
}
if (src_x > src_width - 2) {
ratio_x[0] = 0;
src_x = src_width - 2;
}
ratio_x[1] = 1 - ratio_x[0]; // x2 - x
int dst_i = (_dst_i + x) * dst_channel;
int src_row_0 = (_src_row_0 + src_x) * src_channel;
int src_row_1 = (_src_row_1 + src_x) * src_channel;
if (src_channel == dst_channel) {
for (int c = 0; c < dst_channel; c++) {
temp = round(src_image[src_row_0 + c] * ratio_x[1] * ratio_y[1] //
+ src_image[src_row_0 + src_channel + c] * ratio_x[0] * ratio_y[1] //
+ src_image[src_row_1 + c] * ratio_x[1] * ratio_y[0] //
+ src_image[src_row_1 + src_channel + c] * ratio_x[0] * ratio_y[0]); //
if (rgb_swap)
dst_image[dst_i + dst_channel - 1 - c] = temp;
else
dst_image[dst_i + c] = temp;
}
} else if (src_channel == 3 && dst_channel == 1) // RGB -> Gray
{
int blue = round(src_image[src_row_0] * ratio_x[1] * ratio_y[1] //
+ src_image[src_row_0 + src_channel] * ratio_x[0] * ratio_y[1] //
+ src_image[src_row_1] * ratio_x[1] * ratio_y[0] //
+ src_image[src_row_1 + src_channel] * ratio_x[0] * ratio_y[0]); //
int green = round(src_image[src_row_0 + 1] * ratio_x[1] * ratio_y[1] //
+ src_image[src_row_0 + src_channel + 1] * ratio_x[0] * ratio_y[1] //
+ src_image[src_row_1 + 1] * ratio_x[1] * ratio_y[0] //
+ src_image[src_row_1 + src_channel + 1] * ratio_x[0] * ratio_y[0]); //
int red = round(src_image[src_row_0 + 2] * ratio_x[1] * ratio_y[1] //
+ src_image[src_row_0 + src_channel + 2] * ratio_x[0] * ratio_y[1] //
+ src_image[src_row_1 + 2] * ratio_x[1] * ratio_y[0] //
+ src_image[src_row_1 + src_channel + 2] * ratio_x[0] * ratio_y[0]); //
if (rgb_swap)
dst_image[dst_i] = convert_pixel_rgb888_to_gray(blue, green, red);
else
dst_image[dst_i] = convert_pixel_rgb888_to_gray(red, green, blue);
} else {
printf("Not implement src_channel = %d and dst_channel = %d\n", src_channel, dst_channel);
}
}
}
break;
case IMAGE_RESIZE_MEAN:
for (size_t y = dst_y_start; y < dst_y_end; y++) {
int _dst_i = y * dst_width;
float src_y = rintf((y - dst_y_start) * scale_y + src_y_start);
src_y = DL_CLIP(src_y, 0, src_height - 2);
float _src_row_0 = src_y * src_width;
float _src_row_1 = _src_row_0 + src_width;
for (size_t x = dst_x_start; x < dst_x_end; x++) {
int dst_i = (_dst_i + x) * dst_channel;
float src_x = rintf((x - dst_x_start) * scale_x) + src_x_start;
src_x = DL_CLIP(src_x, 0, src_width - 2);
int src_row_0 = (_src_row_0 + src_x) * src_channel;
int src_row_1 = (_src_row_1 + src_x) * src_channel;
if (src_channel == dst_channel) {
for (size_t c = 0; c < dst_channel; c++) {
temp = (int)src_image[src_row_0 + c] + (int)src_image[src_row_0 + dst_channel + c] +
(int)src_image[src_row_1 + c] + (int)src_image[src_row_1 + dst_channel + c];
if (rgb_swap)
dst_image[dst_i + dst_channel - 1 - c] = temp >> 2;
else
dst_image[dst_i + c] = temp >> 2;
}
} else if (src_channel == 3 && dst_channel == 1) // RGB -> Gray
{
int blue = (int)src_image[src_row_0] //
+ (int)src_image[src_row_0 + dst_channel] //
+ (int)src_image[src_row_1] //
+ (int)src_image[src_row_1 + dst_channel]; //
int green = (int)src_image[src_row_0 + 1] //
+ (int)src_image[src_row_0 + dst_channel + 1] //
+ (int)src_image[src_row_1 + 1] //
+ (int)src_image[src_row_1 + dst_channel + 1]; //
int red = (int)src_image[src_row_0 + 2] //
+ (int)src_image[src_row_0 + dst_channel + 2] //
+ (int)src_image[src_row_1 + 2] //
+ (int)src_image[src_row_1 + dst_channel + 2]; //
if (rgb_swap)
dst_image[dst_i] = convert_pixel_rgb888_to_gray(blue, green, red) >> 2;
else
dst_image[dst_i] = convert_pixel_rgb888_to_gray(red, green, blue) >> 2;
} else {
printf("Not implement src_channel = %d and dst_channel = %d\n", src_channel, dst_channel);
}
}
}
break;
case IMAGE_RESIZE_NEAREST:
for (size_t y = dst_y_start; y < dst_y_end; y++) {
int _dst_i = y * dst_width;
float src_y = rintf((y - dst_y_start) * scale_y + src_y_start);
src_y = DL_CLIP(src_y, 0, src_height - 1);
float _src_i = src_y * src_width;
for (size_t x = dst_x_start; x < dst_x_end; x++) {
int dst_i = (_dst_i + x) * dst_channel;
float src_x = rintf((x - dst_x_start) * scale_x) + src_x_start;
src_x = DL_CLIP(src_x, 0, src_width - 1);
int src_i = (_src_i + src_x) * dst_channel;
if (src_channel == dst_channel) {
for (size_t c = 0; c < dst_channel; c++) {
if (rgb_swap)
dst_image[dst_i + dst_channel - 1 - c] = (T)src_image[src_i + c];
else
dst_image[dst_i + c] = (T)src_image[src_i + c];
}
} else if (src_channel == 3 && dst_channel == 1) // RGB -> Gray
{
if (rgb_swap)
dst_image[dst_i] =
convert_pixel_rgb888_to_gray(src_image[src_i], src_image[src_i + 1], src_image[src_i + 2]);
else
dst_image[dst_i] =
convert_pixel_rgb888_to_gray(src_image[src_i + 2], src_image[src_i + 1], src_image[src_i]);
} else {
printf("Not implement src_channel = %d and dst_channel = %d\n", src_channel, dst_channel);
}
}
}
break;
default:
printf("Not implement image_resize_type = %d\n", resize_type);
break;
}
}
template void crop_and_resize(uint8_t *dst_image,
int dst_width,
int dst_channel,
int dst_y_start,
int dst_y_end,
int dst_x_start,
int dst_x_end,
uint8_t *src_image,
int src_height,
int src_width,
int src_channel,
int src_y_start,
int src_y_end,
int src_x_start,
int src_x_end,
resize_type_t resize_type,
bool rgb_swap);
template void crop_and_resize(int16_t *dst_image,
int dst_width,
int dst_channel,
int dst_y_start,
int dst_y_end,
int dst_x_start,
int dst_x_end,
uint8_t *src_image,
int src_height,
int src_width,
int src_channel,
int src_y_start,
int src_y_end,
int src_x_start,
int src_x_end,
resize_type_t resize_type,
bool rgb_swap);
template void crop_and_resize(int8_t *dst_image,
int dst_width,
int dst_channel,
int dst_y_start,
int dst_y_end,
int dst_x_start,
int dst_x_end,
uint8_t *src_image,
int src_height,
int src_width,
int src_channel,
int src_y_start,
int src_y_end,
int src_x_start,
int src_x_end,
resize_type_t resize_type,
bool rgb_swap);
void draw_filled_rectangle(uint8_t *image,
const uint32_t image_height,
const uint32_t image_width,
uint32_t x1,
uint32_t y1,
uint32_t x2,
uint32_t y2,
const uint32_t color)
{
assert(x2 >= x1);
assert(y2 >= y1);
x1 = DL_MIN(x1, image_width - 1);
y1 = DL_MIN(y1, image_height - 1);
x2 = DL_MIN(x2, image_width - 1);
y2 = DL_MIN(y2, image_height - 1);
uint8_t c0 = color >> 16;
uint8_t c1 = color >> 8;
uint8_t c2 = color;
uint8_t *ptr = image + (y1 * image_width + x1) * 3;
uint32_t offset = image_width * 3;
for (int y = y1; y <= y2; y++) {
uint8_t *row = ptr;
for (int x = x1; x <= x2; x++) {
row[0] = c0;
row[1] = c1;
row[2] = c2;
row += 3;
}
ptr += offset;
}
}
void draw_filled_rectangle(uint16_t *image,
const uint32_t image_height,
const uint32_t image_width,
uint32_t x1,
uint32_t y1,
uint32_t x2,
uint32_t y2,
const uint16_t color)
{
assert(x2 >= x1);
assert(y2 >= y1);
x1 = DL_MIN(x1, image_width - 1);
y1 = DL_MIN(y1, image_height - 1);
x2 = DL_MIN(x2, image_width - 1);
y2 = DL_MIN(y2, image_height - 1);
uint16_t *ptr = image + y1 * image_width + x1;
for (int y = y1; y <= y2; y++) {
uint16_t *row = ptr;
for (int x = x1; x <= x2; x++) {
*row = color;
row++;
}
ptr += image_width;
}
}
void draw_point(uint8_t *image,
const uint32_t image_height,
const uint32_t image_width,
const uint32_t x,
const uint32_t y,
const uint32_t size,
const uint32_t color)
{
int half_size = size >> 1;
draw_filled_rectangle(image,
image_height,
image_width,
DL_MAX((int)x - half_size, 0),
DL_MAX((int)y - half_size, 0),
x + half_size,
y + half_size,
color);
}
void draw_point(uint16_t *image,
const uint32_t image_height,
const uint32_t image_width,
const uint32_t x,
const uint32_t y,
const uint32_t size,
uint16_t color)
{
int half_size = size >> 1;
draw_filled_rectangle(image,
image_height,
image_width,
DL_MAX((int)x - half_size, 0),
DL_MAX((int)y - half_size, 0),
x + half_size,
y + half_size,
color);
}
void draw_hollow_rectangle(uint8_t *image,
const uint32_t image_height,
const uint32_t image_width,
uint32_t x1,
uint32_t y1,
uint32_t x2,
uint32_t y2,
uint32_t color)
{
assert(x2 >= x1);
assert(y2 >= y1);
x1 = DL_MIN(x1, image_width - 1);
y1 = DL_MIN(y1, image_height - 1);
x2 = DL_MIN(x2, image_width - 1);
y2 = DL_MIN(y2, image_height - 1);
uint8_t c0 = color >> 16;
uint8_t c1 = color >> 8;
uint8_t c2 = color;
// draw horizon
uint8_t *row_up = image + (y1 * image_width + x1) * 3;
uint8_t *row_down = image + (y2 * image_width + x1) * 3;
for (int x = x1; x <= x2; x++) {
row_up[0] = c0;
row_up[1] = c1;
row_up[2] = c2;
row_up += 3;
row_down[0] = c0;
row_down[1] = c1;
row_down[2] = c2;
row_down += 3;
}
// draw vertical
uint8_t *colum_left = image + (y1 * image_width + x1) * 3;
uint8_t *colum_right = image + (y1 * image_width + x2) * 3;
uint32_t offset = image_width * 3;
for (int y = y1; y <= y2; y++) {
colum_left[0] = c0;
colum_left[1] = c1;
colum_left[2] = c2;
colum_left += offset;
colum_right[0] = c0;
colum_right[1] = c1;
colum_right[2] = c2;
colum_right += offset;
}
}
void draw_hollow_rectangle(uint16_t *image,
const uint32_t image_height,
const uint32_t image_width,
uint32_t x1,
uint32_t y1,
uint32_t x2,
uint32_t y2,
const uint16_t color)
{
assert(x2 >= x1);
assert(y2 >= y1);
x1 = DL_MIN(x1, image_width - 1);
y1 = DL_MIN(y1, image_height - 1);
x2 = DL_MIN(x2, image_width - 1);
y2 = DL_MIN(y2, image_height - 1);
// draw horizon
uint16_t *row_up = image + y1 * image_width + x1;
uint16_t *row_down = image + y2 * image_width + x1;
for (int x = x1; x <= x2; x++) {
*row_up = color;
row_up++;
*row_down = color;
row_down++;
}
// draw vertical
uint16_t *colum_left = image + y1 * image_width + x1;
uint16_t *colum_right = image + y1 * image_width + x2;
for (int y = y1; y <= y2; y++) {
*colum_left = color;
colum_left += image_width;
*colum_right = color;
colum_right += image_width;
}
}
uint32_t get_moving_point_number(uint16_t *f1,
uint16_t *f2,
const uint32_t height,
const uint32_t width,
const uint32_t stride,
const uint32_t threshold)
{
uint32_t stride_y_offset = width * stride;
uint32_t count = 0;
for (uint32_t y = 0; y < height; y += stride) {
uint16_t *f1_row = f1;
uint16_t *f2_row = f2;
for (uint32_t x = 0; x < width; x += stride) {
int f1_gray = convert_pixel_rgb565_to_gray(*f1_row);
int f2_gray = convert_pixel_rgb565_to_gray(*f2_row);
if (DL_ABS(f1_gray - f2_gray) > threshold)
count++;
f1_row += stride;
f2_row += stride;
}
f1 += stride_y_offset;
f2 += stride_y_offset;
}
return count;
}
uint32_t get_moving_point_number(uint8_t *f1,
uint8_t *f2,
const uint32_t height,
const uint32_t width,
const uint32_t stride,
const uint32_t threshold)
{
uint32_t stride_y_offset = width * stride * 3;
uint32_t stride_x_offset = stride * 3;
uint32_t count = 0;
for (uint32_t y = 0; y < height; y += stride) {
uint8_t *f1_row = f1;
uint8_t *f2_row = f2;
for (uint32_t x = 0; x < width; x += stride) {
int f1_gray = convert_pixel_rgb888_to_gray(f1_row[2], f1_row[1], f1_row[0]);
int f2_gray = convert_pixel_rgb888_to_gray(f2_row[2], f2_row[1], f2_row[0]);
if (DL_ABS(f1_gray - f2_gray) > threshold)
count++;
f1_row += stride_x_offset;
f2_row += stride_x_offset;
}
f1 += stride_y_offset;
f2 += stride_y_offset;
}
return count;
}
template <typename T>
void warp_affine(uint8_t *input,
const std::vector<int> &input_shape,
T *output,
const std::vector<int> &output_shape,
dl::math::Matrix<float> *M_inv,
bool byte_swap)
{
int input_stride = input_shape[1] * input_shape[2]; // stride = w * c
int c = input_shape[2];
int output_h = output_shape[0];
int output_w = output_shape[1];
float x_src = 0.0;
float y_src = 0.0;
int x1 = 0;
int x2 = 0;
int y1 = 0;
int y2 = 0;
for (int i = 0; i < output_h; i++) {
for (int j = 0; j < output_w; j++) {
x_src = (M_inv->array[0][0] * j + M_inv->array[0][1] * i + M_inv->array[0][2]) /
(M_inv->array[2][0] * j + M_inv->array[2][1] * i + M_inv->array[2][2]);
y_src = (M_inv->array[1][0] * j + M_inv->array[1][1] * i + M_inv->array[1][2]) /
(M_inv->array[2][0] * j + M_inv->array[2][1] * i + M_inv->array[2][2]);
if ((x_src < 0) || (y_src < 0) || (x_src >= (input_shape[1] - 1)) || (y_src >= (input_shape[0] - 1))) {
for (int k = 0; k < c; k++) {
*output++ = 0;
}
} else {
x1 = floor(x_src);
x2 = x1 + 1;
y1 = floor(y_src);
y2 = y1 + 1;
for (int k = 0; k < c; k++) {
*output++ = (T)rintf(((input[y1 * input_stride + x1 * c + k]) * (x2 - x_src) * (y2 - y_src)) +
((input[y1 * input_stride + x2 * c + k]) * (x_src - x1) * (y2 - y_src)) +
((input[y2 * input_stride + x1 * c + k]) * (x2 - x_src) * (y_src - y1)) +
((input[y2 * input_stride + x2 * c + k]) * (x_src - x1) * (y_src - y1)));
}
}
}
}
}
template void warp_affine(uint8_t *input,
const std::vector<int> &input_shape,
uint8_t *output,
const std::vector<int> &output_shape,
dl::math::Matrix<float> *M_inv,
bool byte_swap);
template void warp_affine(uint8_t *input,
const std::vector<int> &input_shape,
int16_t *output,
const std::vector<int> &output_shape,
dl::math::Matrix<float> *M_inv,
bool byte_swap);
template <typename T>
void warp_affine(uint16_t *input,
const std::vector<int> &input_shape,
T *output,
const std::vector<int> &output_shape,
dl::math::Matrix<float> *M_inv,
bool byte_swap)
{
int input_stride = input_shape[1]; // stride = w
int c = input_shape[2];
assert(c == 3);
int output_h = output_shape[0];
int output_w = output_shape[1];
float x_src = 0.0;
float y_src = 0.0;
int x1 = 0;
int x2 = 0;
int y1 = 0;
int y2 = 0;
uint8_t src_x1y1[3] = {0};
uint8_t src_x1y2[3] = {0};
uint8_t src_x2y1[3] = {0};
uint8_t src_x2y2[3] = {0};
for (int i = 0; i < output_h; i++) {
for (int j = 0; j < output_w; j++) {
x_src = (M_inv->array[0][0] * j + M_inv->array[0][1] * i + M_inv->array[0][2]) /
(M_inv->array[2][0] * j + M_inv->array[2][1] * i + M_inv->array[2][2]);
y_src = (M_inv->array[1][0] * j + M_inv->array[1][1] * i + M_inv->array[1][2]) /
(M_inv->array[2][0] * j + M_inv->array[2][1] * i + M_inv->array[2][2]);
if ((x_src < 0) || (y_src < 0) || (x_src >= (input_shape[1] - 1)) || (y_src >= (input_shape[0] - 1))) {
for (int k = 0; k < c; k++) {
*output++ = 0;
}
} else {
x1 = floor(x_src);
x2 = x1 + 1;
y1 = floor(y_src);
y2 = y1 + 1;
dl::image::convert_pixel_rgb565_to_rgb888(input[y1 * input_stride + x1], src_x1y1);
dl::image::convert_pixel_rgb565_to_rgb888(input[y2 * input_stride + x1], src_x1y2);
dl::image::convert_pixel_rgb565_to_rgb888(input[y1 * input_stride + x2], src_x2y1);
dl::image::convert_pixel_rgb565_to_rgb888(input[y2 * input_stride + x2], src_x2y2);
*output++ =
(T)rintf((src_x1y1[0] * (x2 - x_src) * (y2 - y_src)) + (src_x2y1[0] * (x_src - x1) * (y2 - y_src)) +
(src_x1y2[0] * (x2 - x_src) * (y_src - y1)) + (src_x2y2[0] * (x_src - x1) * (y_src - y1)));
*output++ =
(T)rintf((src_x1y1[1] * (x2 - x_src) * (y2 - y_src)) + (src_x2y1[1] * (x_src - x1) * (y2 - y_src)) +
(src_x1y2[1] * (x2 - x_src) * (y_src - y1)) + (src_x2y2[1] * (x_src - x1) * (y_src - y1)));
*output++ =
(T)rintf((src_x1y1[2] * (x2 - x_src) * (y2 - y_src)) + (src_x2y1[2] * (x_src - x1) * (y2 - y_src)) +
(src_x1y2[2] * (x2 - x_src) * (y_src - y1)) + (src_x2y2[2] * (x_src - x1) * (y_src - y1)));
}
}
}
}
template void warp_affine(uint16_t *input,
const std::vector<int> &input_shape,
uint8_t *output,
const std::vector<int> &output_shape,
dl::math::Matrix<float> *M_inv,
bool byte_swap);
template void warp_affine(uint16_t *input,
const std::vector<int> &input_shape,
int16_t *output,
const std::vector<int> &output_shape,
dl::math::Matrix<float> *M_inv,
bool byte_swap);
uint8_t get_otsu_thresh(Tensor<uint8_t> &image)
{
if (image.shape.size() == 3) {
assert(image.shape[2] == 1);
} else {
assert(image.shape.size() == 2);
}
int numPixels = image.get_size();
const int HISTOGRAM_SIZE = 256;
unsigned int histogram[HISTOGRAM_SIZE];
memset(histogram, 0, (HISTOGRAM_SIZE) * sizeof(unsigned int));
uint8_t *ptr = image.element;
int length = numPixels;
while (length--) {
uint8_t value = *ptr++;
histogram[value]++;
}
int sum = 0;
for (int i = 0; i < HISTOGRAM_SIZE; ++i) {
sum += i * histogram[i];
}
int sumB = 0;
int q1 = 0;
double max = 0;
uint8_t threshold = 0;
for (int i = 0; i < HISTOGRAM_SIZE; ++i) {
q1 += histogram[i];
if (q1 == 0)
continue;
const int q2 = numPixels - q1;
if (q2 == 0)
break;