ResizeNearest

Adjusts the image size using the nearest-neighbor interpolation algorithm.

Before calling the ResizeNearest function, you need to call Init for initialization, call the main function of the ResizeLinear function, and then call Release to release the related space.

The function interface is declared as follows:

Initialization function:
HmppResult HMPPI_ResizeNearestInit_32f(HmppiSize srcSize, HmppiSize dstSize, HmppiResizePolicy_32f **pSpec);
Main function:
HmppResult HMPPI_ResizeNearest_32f_C1R(const float *pSrc, int srcStep, float *pDst, int dstStep, HmppiPoint dstOffset, HmppiSize dstSize, const HmppiResizePolicy_32f *pSpec);
Release function:
HmppResult HMPPI_ResizeNearestRelease_32f(HmppiResizePolicy_32f *policy);

Parameters

Parameter	Description	Value Range	Input/Output
pSrc	Pointer to the source image ROI	The value cannot be NULL.	Input
srcStep	Distance between starts of consecutive lines in the source image, in bytes	The value must be zero or a positive integer.	Input
srcSize	Size of the source image block	Positive integer	Input
pDst	Pointer to the destination image ROI	The value cannot be NULL.	Input/Output
dstStep	Distance between starts of consecutive lines in the destination image, in bytes	The value must be zero or a positive integer.	Input
dstOffset	Offset of the destination image block	The value must be zero or a positive integer.	Input
dstSize	Size of the destination image block	Positive integer	Input
pSpec	Pointer to the special structure	The value cannot be NULL.	Input/Output

Return Value

Success: HMPP_STS_NO_ERR
Failure: An error code is returned.

Error Codes

Error Code	Description
HMPP_STS_NO_OPERATION	This is an alarm and no operation is performed. The width or height in srcSize and dstSize is 0.
HMPP_STS_NULL_PTR_ERR	A null pointer exists.
HMPP_STS_MALLOC_FAILED	Failed to allocate memory during pSpec initialization.
HMPP_STS_SIZE_ERR	The width or height in srcSize and dstSize is a negative value.
HMPP_STS_STEP_ERR	srcStep or dstStep is not an integer multiple of the float byte length. srcStep or dstStep is less than the product of the float byte length and srcwidth or dstwidth.
HMPP_STS_BORDER_ERR	The specified border algorithm type is not supported.
HMPP_STS_OUT_OF_RANGE_ERR	The offset of the destination image block is greater than the width or height of the destination image block input by the Init function.
HMPP_STS_SIZE_WRN	The width or height of the destination image block is greater than the width or height of the destination image block input by the Init function.

Example

void ResizeNearestExample()
{
    HmppiSize srcSize = {3, 3};
    HmppiSize dstSize = {6, 6};
    HmppiPoint dstOffset = {0, 0};
    int srcStep = srcSize.width * sizeof(float);
    int dstStep = dstSize.width * sizeof(float);
    HmppiResizePolicy_32f *pSpec; 
    float pSrc[] = {0.0, 255.0, 3.0, 6.0, 255.0, 0.0, 2.0, 1.0, 3.0};
    int dstLen = dstSize.width * dstSize.height;
    float *pDst = HMPPS_Malloc_32f(dstLen);
    HMPPI_ResizeNearestInit_32f(srcSize, dstSize, &pSpec);
    HmppResult result = HMPPI_ResizeNearest_32f_C1R (
        pSrc, srcStep, pDst, dstStep, dstOffset, dstSize, &pSpec);
    printf("result = %d\n", result);
    if (result != HMPP_STS_NO_ERR) {
        return;
    } 
    for (int i = 0; i < dstLen; i++){
        printf("%f ", pDst[i]);
    }
    printf("\n");
    HMPPI_ResizeNearestRelease_32f(pSpec);
}

Output:

result = 0
0.000000 255.000000 255.000000 3.000000 3.000000 0.000000 6.000000 255.000000 255.000000 0.000000 0.000000 0.000000 6.000000 255.000000 255.000000 0.000000 0.000000 0.000000 2.000000 1.000000 1.000000 3.000000 3.000000 0.000000 2.000000 1.000000 1.000000 3.000000 3.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000

Parent topic: Image Conversion