Пример #1
0
static int column_all_dark( hb_buffer_t* buf, int top, int bottom, int col )
{
    int stride = buf->plane[0].stride;
    int height = buf->plane[0].height - top - bottom;
    uint8_t *luma = buf->plane[0].data + stride * top + col;

    // compute the average value of the column
    int i = height, avg = 0, row = 0;
    for ( ; --i >= 0; row += stride )
    {
        avg += clampBlack( luma[row] );
    }
    avg /= height;
    if ( avg >= DARK )
        return 0;

    // since we're trying to detect smooth borders, only take the column if
    // all pixels are within +-16 of the average.
    i = height, row = 0;
    for ( ; --i >= 0; row += stride )
    {
        if ( absdiff( avg, clampBlack( luma[row] ) ) > 16 )
            return 0;
    }
    return 1;
}
Пример #2
0
static int column_all_dark( hb_title_t *title, uint8_t* luma, int top, int bottom,
                            int col )
{
    int stride = title->width;
    int height = title->height - top - bottom;
    luma += stride * top + col;

    // compute the average value of the column
    int i = height, avg = 0, row = 0;
    for ( ; --i >= 0; row += stride )
    {
        avg += clampBlack( luma[row] );
    }
    avg /= height;
    if ( avg >= DARK )
        return 0;

    // since we're trying to detect smooth borders, only take the column if
    // all pixels are within +-16 of the average.
    i = height, row = 0;
    for ( ; --i >= 0; row += stride )
    {
        if ( absdiff( avg, clampBlack( luma[row] ) ) > 16 )
            return 0;
    }
    return 1;
}
Пример #3
0
static int row_all_dark( hb_buffer_t* buf, int row )
{
    int width = buf->plane[0].width;
    int stride = buf->plane[0].stride;
    uint8_t *luma = buf->plane[0].data + stride * row;

    // compute the average luma value of the row
    int i, avg = 0;
    for ( i = 0; i < width; ++i )
    {
        avg += clampBlack( luma[i] );
    }
    avg /= width;
    if ( avg >= DARK )
        return 0;

    // since we're trying to detect smooth borders, only take the row if
    // all pixels are within +-16 of the average (this range is fairly coarse
    // but there's a lot of quantization noise for luma values near black
    // so anything less will fail to crop because of the noise).
    for ( i = 0; i < width; ++i )
    {
        if ( absdiff( avg, clampBlack( luma[i] ) ) > 16 )
            return 0;
    }
    return 1;
}
Пример #4
0
static int row_all_dark( hb_title_t *title, uint8_t* luma, int row )
{
    luma += title->width * row;

    // compute the average luma value of the row
    int i, avg = 0;
    for ( i = 0; i < title->width; ++i )
    {
        avg += clampBlack( luma[i] );
    }
    avg /= title->width;
    if ( avg >= DARK )
        return 0;

    // since we're trying to detect smooth borders, only take the row if
    // all pixels are within +-16 of the average (this range is fairly coarse
    // but there's a lot of quantization noise for luma values near black
    // so anything less will fail to crop because of the noise).
    for ( i = 0; i < title->width; ++i )
    {
        if ( absdiff( avg, clampBlack( luma[i] ) ) > 16 )
            return 0;
    }
    return 1;
}