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You should used a different name for each image:

char image_name[ 4 ][] = { "image1", "image2", "image3", "image4" };
for( int y = 0, i = 0 ; y < image.rows ; y += smallSize.height )
    for( int x = 0 ; x < image.cols ; x += smallSize.width, ++i )
        imshow( image_name[ i ], smallImages[ i ] );
waitKey( 0 );

Otherwise, you display every image in the same window, therefore, you only see the last one. By the way, don't forget the waitKey, otherwise, you won't see anything! (but I guess you already have it?)

You should used a different name for each image:

char image_name[ 4 ][] ][ 255 ] = { "image1", "image2", "image3", "image4" };
for( int y = 0, i = 0 ; y < image.rows ; y += smallSize.height )
    for( int x = 0 ; x < image.cols ; x += smallSize.width, ++i )
        imshow( image_name[ i ], smallImages[ i ] );
waitKey( 0 );

Otherwise, you display every image in the same window, therefore, you only see the last one. By the way, don't forget the waitKey, otherwise, you won't see anything! (but I guess you already have it?)

You should used a different name for each image:

char image_name[ 4 ][ 255 ] = { "image1", "image2", "image3", "image4" };
for( int y = 0, i = 0 ; y < image.rows ; y += smallSize.height )
    for( int x = 0 ; x < image.cols ; x += smallSize.width, ++i )
    {
 imshow(     smallImages[ i ].push_back( cv::Mat( image, rect ).clone() );
        cv::imshow( image_name[ i ], smallImages[ i ] );
    }
waitKey( 0 );

Otherwise, you display every image in the same window, therefore, you only see the last one. By the way, don't forget the waitKey, otherwise, you won't see anything! (but I guess you already have it?)

You should used use a different name for each image:

char image_name[ 4 ][ 255 ] = { "image1", "image2", "image3", "image4" };
for( int y = 0, i = 0 ; y < image.rows ; y += smallSize.height )
    for( int x = 0 ; x < image.cols ; x += smallSize.width, ++i )
    {
        smallImages[ i ].push_back( cv::Mat( image, rect ).clone() );
        cv::imshow( image_name[ i ], smallImages[ i ] );
    }
waitKey( 0 );

Otherwise, you display every image in the same window, therefore, you only see the last one. By the way, don't forget the waitKey, otherwise, you won't see anything! (but I guess you already have it?)

You should use a different name for each image:

char image_name[ 4 ][ 255 ] = { "image1", "image2", "image3", "image4" };
for( int y = 0, i = 0 ; y < image.rows ; y += smallSize.height )
    for( int x = 0 ; x < image.cols ; x += smallSize.width, ++i )
    {
        smallImages[ i ].push_back( smallImages.push_back( cv::Mat( image, rect ).clone() );
        cv::imshow( image_name[ i ], smallImages[ i ] );
    }
waitKey( 0 );

Otherwise, you display every image in the same window, therefore, you only see the last one. By the way, don't forget the waitKey, otherwise, you won't see anything! (but I guess you already have it?)