请教一个数据取全的问题

tqp2008

我现在碰到一个问题,就是我在PREVIEW模式下的效果很好了,图象很清楚,但我照相的时候抓出来的图象在LCD上显示跟在PREVIEW模式下比显的很黄,按道理应该是一样的啊,我的程序是从SDRAM里面抓出数据然后把它写到NAND FLASH里面去,请教各位大哥,为什么会这样啊?
[em01]

tqp2008

我现在碰到一个问题,就是我在PREVIEW模式下的效果很好了,图象很清楚,但我照相的时候抓出来的图象在LCD上显示跟在PREVIEW模式下比显的很黄,按道理应该是一样的啊,我的程序是从SDRAM里面抓出数据然后把它写到NAND FLASH里面去,请教各位大哥,为什么会这样啊?
[em01]

tqp2008

怎么没人回答我呀?!
   自己顶一下[em02]

chengsean

Your problem can be divided into two reasons.
One, Do you see the preview image and captured image with the same LCD ??
If you see the preview image and captured image with different LCD, the differentiation is
represented. If you see that in the same LCD, then let's go to the second reasons.

Second, in generally, the AE, AWB, AF algorithm is different in preview mode and the captured mode. Your phenomenon may be caused by the difference of AWB. You can check the
ISP AWB setting about R, G, B gain value to see if the value is the same in preview mode
and caputred mode.

tqp2008

我的 preview image and captured image 是在同一个LCD上面出现的那种现象,而且 preview  and capture时用的同一种白平衡,但 preview  and capture时AE不同.chengsean,能再指点下吗?我的问题还是没有解决![em04]

chengsean

Even you use the same AWB, the gain ISP calculated is not the same in preview mode and
capture mode. You can check the gain in preview mode and capture mode.
1. check the sensor gain (R, Gr, Gb, B) in preivew and capture.
2. check the ISP gain (R, Gr, Gb, B) in preview cna capture.
The 1. and 2 should be the same in preview and capture if AE is the same. But your AE is
not the same, you only check the ratio of the gain not the value.

tqp2008

怎么没人回答我呀?!
   自己顶一下[em02]

chengsean

Your problem can be divided into two reasons.
One, Do you see the preview image and captured image with the same LCD ??
If you see the preview image and captured image with different LCD, the differentiation is
represented. If you see that in the same LCD, then let's go to the second reasons.

Second, in generally, the AE, AWB, AF algorithm is different in preview mode and the captured mode. Your phenomenon may be caused by the difference of AWB. You can check the
ISP AWB setting about R, G, B gain value to see if the value is the same in preview mode
and caputred mode.

tqp2008

我的 preview image and captured image 是在同一个LCD上面出现的那种现象,而且 preview  and capture时用的同一种白平衡,但 preview  and capture时AE不同.chengsean,能再指点下吗?我的问题还是没有解决![em04]

chengsean

Even you use the same AWB, the gain ISP calculated is not the same in preview mode and
capture mode. You can check the gain in preview mode and capture mode.
1. check the sensor gain (R, Gr, Gb, B) in preivew and capture.
2. check the ISP gain (R, Gr, Gb, B) in preview cna capture.
The 1. and 2 should be the same in preview and capture if AE is the same. But your AE is
not the same, you only check the ratio of the gain not the value.

zqyy

一般preview和拍照的时候是用不同的分辨率的。也就是说PCLK是不一样的，会不会这里出什么问题