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旧 Sep 5th, 2006, 19:59     #1
heropage
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默认 今天发现了数码摄像机的奇怪现象

我的是canon elura 100。
昨天去玩,sd卡用完了,没办法只好用磁带(我一直不喜欢用磁带,因为转换麻烦)。
回来后放到电视上一看,发现效果非常好,很清晰。
以前用sd卡时,效果不好,我还以为数码摄像机都是这样的!
我发现最大的分辨率只能是320X240,
大家有类似的经历吗?是不是我用sd卡时什么东西没有设置好。
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旧 Sep 5th, 2006, 22:07   只看该作者   #2
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默认

哈哈,楼主有趣, 那SD卡本来就是用来拍静态相片的, DV带才是拍动态的
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旧 Sep 5th, 2006, 22:39   只看该作者   #3
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默认

呵呵,DV带拍的是720X480的分辨率,SD卡如果拍的是320X240的,那说明只是为了紧急情况下用

而且SD卡录像的帧频可能达不到电视标准(30/秒)
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旧 Sep 5th, 2006, 22:52   只看该作者   #4
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默认

以前有人结婚十年无孩到医院求治,医生才发现原来太太还是处女。
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旧 Sep 5th, 2006, 23:12   只看该作者   #5
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默认

引用:
作者: millermin
以前有人结婚十年无孩到医院求治,医生才发现原来太太还是处女。
太强了

听说而已 没有亲见
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旧 Sep 5th, 2006, 23:13   只看该作者   #6
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默认

各位都很行。
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旧 Sep 6th, 2006, 08:27   只看该作者   #7
heropage
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默认

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作者: cowboytom
哈哈,楼主有趣, 那SD卡本来就是用来拍静态相片的, DV带才是拍动态的
那说明数码摄像机并非“数码”,对吗?
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旧 Sep 6th, 2006, 09:04   只看该作者   #8
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默认

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作者: heropage
那说明数码摄像机并非“数码”,对吗?
就因为是“数码”的所以才如此的不清楚, 因为数码格式受存储尺寸的限制, 所以牺牲质量获得空间的节省

如果是模拟的, 比sd 的要清楚。
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旧 Sep 6th, 2006, 12:05   只看该作者   #9
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默认

引用:
作者: River
就因为是“数码”的所以才如此的不清楚, 因为数码格式受存储尺寸的限制, 所以牺牲质量获得空间的节省

如果是模拟的, 比sd 的要清楚。
不要误导人,DV带存储的就是数码影像,比模拟影像清楚多了
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旧 Sep 6th, 2006, 12:18   只看该作者   #10
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默认

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作者: 1newcomer
不要误导人,DV带存储的就是数码影像,比模拟影像清楚多了
说的没错啊, dv 带子, 是数码的, sd呢也是数码, 格式不一样而已
你也不要误导人啊
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旧 Sep 6th, 2006, 20:35   只看该作者   #11
heropage
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默认

这么说大部分数码摄像机都是用磁带来拍的。
在我感觉数码应该用sd卡才叫数码.
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旧 Sep 6th, 2006, 21:08   只看该作者   #12
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默认

磁带是数字的,自然也是数码啦。
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旧 Sep 7th, 2006, 23:14   只看该作者   #13
millermin
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默认

存储介质和数据格式无关。如果数码相片存在3寸软盘里就不再叫数码相片吗?以前没有大硬盘时,还有人用磁带机存储数据。磁带和sd容量差异大,存储时影像数据压缩率不一样,数据损失程度不同,但我认为应该都是数码的。
但是,有另外一种理由说:由于dv机的机构和模拟的很相似,也是斜绕在磁头的园柱面上,逐帧扫描,所以磁带的数据应该是模拟的,传入电脑时才零时作数摸转换,作简单的无损或低损压缩成avi。因为如果磁带是数码格式,就不用斜绕磁带了,可以平行接触读取数据。
那位内行帮忙解释这里的道理。
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旧 Sep 7th, 2006, 23:33   只看该作者   #14
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默认

我一直觉得录像比静止的照片更有纪念意义,所以也想买数码摄影机。
但是听说所谓数码相机也分纯数码和模拟数码,模拟数码相机需要把影像记录在磁带上,传到电脑里需要1394卡转换。
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旧 Sep 7th, 2006, 23:53   只看该作者   #15
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作者: bachelorqq
我一直觉得录像比静止的照片更有纪念意义,所以也想买数码摄影机。
但是听说所谓数码相机也分纯数码和模拟数码,模拟数码相机需要把影像记录在磁带上,传到电脑里需要1394卡转换。
不是这样分的, 市面上绝大部份的DV都是所谓的纯数码, 你说的模拟数码应该是指当年的过渡产品, 例如SONY的D8, 既可用于原来V8格式的模拟信号, 也可以用于数码信号, 不过在记录容量和体积上都属于上一代产品, 现在市面上很少见了. 纯数码也需要1394卡转换. 另现在大部份的DV都同时带有储存卡拍摄功能, 但由于容量和读写速度问题, 这种方式记录的影像一般是经过压缩的, 还原出来的效果不太好.
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旧 Sep 8th, 2006, 10:05   只看该作者   #16
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作者: millermin
以前有人结婚十年无孩到医院求治,医生才发现原来太太还是处女。
好, 比喻精确.
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旧 Sep 8th, 2006, 10:08   只看该作者   #17
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不是这样分的, 市面上绝大部份的DV都是所谓的纯数码, 你说的模拟数码应该是指当年的过渡产品, 例如SONY的D8, 既可用于原来V8格式的模拟信号, 也可以用于数码信号, 不过在记录容量和体积上都属于上一代产品, 现在市面上很少见了. 纯数码也需要1394卡转换. 另现在大部份的DV都同时带有储存...
1394就是纯粹的digital,象usb一样

模拟的使用av线来转
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旧 Sep 10th, 2006, 23:47   只看该作者   #18
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作者: millermin
存储介质和数据格式无关。如果数码相片存在3寸软盘里就不再叫数码相片吗?以前没有大硬盘时,还有人用磁带机存储数据。磁带和sd容量差异大,存储时影像数据压缩率不一样,数据损失程度不同,但我认为应该都是数码的。
但是,有另外一种理由说:由于dv机的机构和模拟的很相似,也是斜绕在磁头的园柱面上,逐帧扫描,所...
数字还是模拟, 看是否有 A ->D 的过程,
看存的是否为采样后的 0、1 值, 采样频率越高, 越能还原得真实, 当然需要的存储空间也越大, 这里面有个balance 的问题——成本效益问题。
模拟磁带再不好, 第一次使用的时候, 是无损的存储, 随时间和磁带使用次数而还原能力降低,
但凡数码的都是有损的, 因为不可能无限地高频采样, 足够清楚就行了。


现在的dvd 录像机, 是数码的吧, 大多数还不如dv带录出来的清楚, 因为为了压缩存储空间, <4G, 图像质量损失很大。
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旧 Sep 11th, 2006, 10:22   只看该作者   #19
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作者: 风雨楼
模拟磁带再不好, 第一次使用的时候, 是无损的存储, 随时间和磁带使用次数而还原能力降低,
但...
基本上说的不对

模拟电路有失真,非线性放大,不可能是无损。另外信号带宽受限制,从理论上讲损失就太大,VHS级的模拟,质量和现在dv不在一个数量级上
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旧 Sep 11th, 2006, 10:24   只看该作者   #20
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作者: heropage
这么说大部分数码摄像机都是用磁带来拍的。
在我感觉数码应该用sd卡才叫数码.


以前服务器还经常用磁带来备份的说...那东西是绝对数码di...

至于模拟还是数码,是说机器录制和还原的...至于写到磁带上,其实都是0和1
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