下标值既不是数组也不是指针，也不是C程序中的向量

我有一个传递了大小为448x448的img_ptr的程序，该程序分为4个相等的部分，每个角均应用了滤镜，现在我尝试使用每个存储在subBlock subBlockList []中的4个部分一起将图像重新重建;

我被抛出此错误：每行的“错误：下标值既不是数组，也不是指针，也不是向量”：“ subImageTempHolder [i] [j] = subBlockList [x] .vertMask [i] [j]

我怀疑它与指针有关，该如何纠正。

子块结构

struct subBlock {
    unsigned char *horizMask;
    unsigned char *vertMask;
    unsigned char *combMask;
    float localMean;
    float localSD;
    float localMedian;
};
static struct subBlock subBlockList[4];
#define BLOCK_ROW 224 //sub-block row
#define BLOCK_COL 224 //sub-block col
#define imageSize 448

该结构的每个位置都占总图像的四分之一，如下所示：

subBlockList [0] .vertMask包含一个无符号char * 2d（大小为224x224的数组）NW值

subBlockList [1] .vertMask包含一个未签名的char * 2d（大小为224x224的数组）NE值

subBlockList [2] .vertMask包含未签名的char * 2d（大小为224x224的数组）SW值

subBlockList [3] .vertMask包含未签名的char * 2d（大小为224x224的数组）SE值

将4个部分放回一个image_ptr中的函数（一个抛出错误）

image_ptr buildImage(){
   image_ptr retVal; // contains the image pointer to return
   unsigned char subImageTempHolder[imageSize][imageSize];
   int subBlockSize = 224;
        //NW Corner
        for (int i=0; i< subBlockSize; i++) { // 0<224
            for (int j=0; j< subBlockSize; j++){ // 0<224
                   subImageTempHolder[i][j] = subBlockList[0].vertMask[i][j];
            }
        }
        //NE Corner
        for (int i=0; i< subBlockSize; i++) { //0 <224
            for (int j=subBlockSize; j< imageSize; j++){ //224 < 448
                subImageTempHolder[i][j] = subBlockList[1].vertMask[i][j];
            }
        }
        //SW Corner
        for (int i=subBlockSize; i< imageSize; i++) { //224 <448
            for (int j=0; j< subBlockSize; j++){ //0 < 224
                subImageTempHolder[i][j] = subBlockList[2].vertMask[i][j];
            }
        }
        //SE Corner
        for (int i=subBlockSize; i< imageSize; i++) { //224 < 448
            for (int j=subBlockSize; j< imageSize; j++){ //224 <448
                subImageTempHolder[i][j] = subBlockList[3].vertMask[i][j];
            }
        }
        retVal = (image_ptr) subImageTempHolder;
        return retVal;
}

设置如下：

subBlockList[blockPos].vertMask = verticalMask(block); 
//I didnt include the function using line above ^ but you should get the idea.


unsigned char* verticalMask(unsigned char paramBlock[BLOCK_ROW][BLOCK_COL]) {
    unsigned char retVal[BLOCK_ROW][BLOCK_COL]; //return value
    double pixelVal;
    double min = DBL_MAX;
    double max = -DBL_MAX;
    //3x3 Gy Sobel Mask
    int Gy[3][3];
    Gy[0][0] = 1; Gy[0][1] = 2; Gy[0][2] = 1;
    Gy[1][0] = 0; Gy[1][1] = 0; Gy[1][2] = 0;
    Gy[2][0] = -1; Gy[2][1] = -2; Gy[2][2] = -1;

    //filtering
    for (int y = 0; y<= BLOCK_COL-1; y++) {
        for (int x=0; x <= BLOCK_ROW-1; x++) {
            pixelVal = 0.0;
            for (int i = -1; i <= 1; i++) {
                for (int j = -1; j <= 1; j++) {
                    pixelVal += Gy[i+1][j+1] * paramBlock[y+i][x+j];
                }
            }
            if (pixelVal < min) {
                min = pixelVal;
            }
            if (pixelVal > min) {
                max = pixelVal;
            }
        }
    }
    if((int)(max - min) == 0) {
        printf("Error nothing exists");
    }

    //generate image
    for (int y = 1; y < BLOCK_COL - 1; y++) {
        for (int x = 1; x < BLOCK_ROW - 1; x++) {
            pixelVal = 0.0;
            for (int j = -1; j <= 1; j++) {
                for (int i = -1; i <= 1; i++) {
                    pixelVal += Gy[j + 1][i + 1] * paramBlock[y + j][x + i];
                }
            }
            pixelVal = max * (pixelVal - min) / (max - min); //MAX_BRIGHTNESS
            retVal[y][x] = (unsigned char)pixelVal;
            }
        }
    return retVal;
}