Documentation
Rate This Document
Findability
Accuracy
Completeness
Readability
SubmitClose

local_min/local_max

Usage

Traverses all pixels based on a sliding window, and calculates the maximum or minimum value in the sliding window centered on the current pixel, and uses the value as the pixel of the output image at the current position.

Interface

1
2
void kcv_LocalMax_acc(const double *_src, double *_dst, size_t src_rows, size_t src_cols, size_t window_rows, size_t window_cols); 
void kcv_LocalMin_acc(const double *_src, double *_dst, size_t src_rows, size_t src_cols, size_t window_rows, size_t window_cols);

Parameters

Parameter

Description

Value Range

Input/Output

src

Input image.

Not null. The size of the allocated memory is src_rows*src_cols*sizeof(double).

Input

dst

Output image.

Not null. The size of the allocated memory is the same as that of src.

Output

src_rows

Number of rows of the input image.

(0, 16384]

Input

src_cols

Number of columns of the input image.

(0, 16384]

Input

window_rows

Number of rows of the sliding window. The value must be an odd number.

(0, src_rows]

Input

window_cols

Number of columns of the sliding window. The value must be an odd number.

(0, src_cols]

Input

Return Values

  • Success: LITHO_IMG_STS_NO_ERR
  • Failure: an error code

Error Codes

Error Code

Description

LITHO_IMG_STS_NULL_PTR_ERR

The src or dst parameter has a null pointer.

LITHO_IMG_STS_SIZE_ERR
  1. The value of src_rows or src_cols is 0.
  2. The value of window_rows is greater than that of src_rows, or the value of window_cols is greater than that of src_cols.

LITHO_IMG_STS_SIZE_WRN

The value of window_rows or window_cols is not an odd number.

Example

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
#include <stdio.h>
#include <stdlib.h>
#include <complex.h>
#include <iostream>
#include <vector>
#include "kp_litho_img.h"

void test_kcv_laplacian_acc() {
    const size_t src_rows = 8; // Adjustable
    const size_t src_cols = 8; // Adjustable
    const size_t window_rows = 3; // Adjustable
    const size_t window_cols = 3; // Adjustable
    const size_t length = src_rows * src_cols; // Declare and initialize the length.
    double *src = (double *)malloc(length * sizeof(double));
    double *dst = (double *)malloc(length * sizeof(double));
    // Initialize the input image (a simple 5x5 image is used as an example).
    double src_data[5][5] = {
        {0, 0, 0, 0, 0},
        {0, 1, 1, 1, 0},
        {0, 1, 0, 1, 0},
        {0, 1, 1, 1, 0},
        {0, 0, 0, 0, 0}
    };
    for (size_t i = 0; i < src_rows; i++) {
        for (size_t j = 0; j < src_cols; j++) {
            src[i * src_cols + j] = src_data[i][j];
        }
    }
    // Call the function.
    cv::kcv_LocalMax_acc(src, dst, src_rows, src_cols, window_rows, window_cols);
    // Print the result (only part of the result is printed here).
    printf("Upsampled Image:\n");
    for (size_t i = 0; i < src_rows; i++) { // Change to src_rows.
        for (size_t j = 0; j < src_cols; j++) { // Change to src_cols.
            printf("%.2f ", dst[i * src_cols + j]);
            if (j == src_cols - 1) { // Change to src_cols.
                printf("\n");
            }
        }
    }
}
int main() {
    test_kcv_laplacian_acc();
    return 0;
}

Output:

1
2
3
4
5
6
7
8
9
Upsampled Image:
1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
1.00 1.00 1.00 1.00 1.00 0.00 0.00 0.00 
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Parent topic: Interface Definition