例程里有这样一个语句：
int intTemp;
Uint32 tempDisYbuffer = 0x80300000;
fTemp = (*(Uint8 *)(tempSrcYbuffer + (numLines/2+i-1)*numPixels + (j-1))) +
(*(Uint8 *)(tempSrcYbuffer + (numLines/2+i-1)*numPixels + j)) +
(*(Uint8 *)(tempSrcYbuffer + (numLines/2+i-1)*numPixels + (j+1))) +
(*(Uint8 *)(tempSrcYbuffer + i*numPixels + (j-1))) +
(*(Uint8 *)(tempSrcYbuffer + i*numPixels + j)) +
(*(Uint8 *)(tempSrcYbuffer + i*numPixels + (j+1))) +
(*(Uint8 *)(tempSrcYbuffer + (numLines/2+i)*numPixels + (j-1))) +
(*(Uint8 *)(tempSrcYbuffer + (numLines/2+i)*numPixels + j)) +
(*(Uint8 *)(tempSrcYbuffer + (numLines/2+i)*numPixels + (j+1)));
intTemp = (int)(fTemp/9 + 0.5);
*(Uint8 *)(tempDisYbuffer + i*numPixels + j) = intTemp;
我的疑问是：
1 从TVP5150采集来的BIT.656格式信号为什么要用32BIT格式保存？就说Y信号吧，只是0-255,8BIT就够了啊？
2: 把32BIT数据强制转换成8BIT的用意是什么呢？
DSP新手求教达人指点啊 |
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