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About DJI goggles 2

June 9, 2024 分类:FPV,微心情

There are a lot of reviews and opinions regard this product. But I think it is not enough.
I found something really annoying about this thing when I once had one. And no one talked about it.

Back in the day, SAMSUNG is a relatively popular brand in China(I barely see them now). And they produced the product AMOLED panel since then. This thing was used on their phones for a long period, and many people had told me how good it was, but as you may know, the real decent generation of their AMOLED screen was just came out several years ago, when Apple decided to use it. I then found they finally can be acceptable by myself -- their pentile OLED is finally being small enough and not that easier to be noticed. So I bought my very first Samsung phone - S23.

So what I'm saying is that DJI goggles 2(including integra), has exactly the PenTile pixel screen panel in it. It looks just sucks to me. These pixels just keep stabbing my eyes.

Sorry DJI. I mean it. But it is what it is. I don't want to talk about the dead pixels. It all about PenTile pixels. Yes, I can also notice some flick of black out of the screens, but I think all the 1080p oled screens have that issue.

You can read more about PenTile OLED here : https://www.oled-info.com/pentile

I can't use it anymore. Maybe the next generation.

图传系统总结

December 5, 2023 分类:FPV

405491113_1077249653292422_6365736064413115025_n.jpg

嗨JB,你对蜗牛数字图传系统大体怎么看?你觉得它在性能和质量方面都比DJI强吗?我在用V1眼镜并正在找一个相对紧凑的。我应该直接上G2而不是蜗牛吗?
或者再等等,DJI在2024年发布的新眼镜?我不着急。我经常旅行所以我想减少点重量且方便携带。爱听你的想法。

JB:

我不觉得蜗牛比DJI好(总体上)。我个人的看法是,蜗牛和DJI v2/vista 系统在同一水平上或者还差一丁点儿。和O3则差一个档次~

但是蜗牛有其它的很多优点比如 1S 图传,HDMI输出等。然后图传距离和穿透性也已经足够好即便可能不如DJI。所以它对很多人来说仍是个不错的选择,可以考虑。

以上是最近看见的一个对话,可以说JB的回答很实际了。
就像之前我发的一些看法一样。我做了一个表格:

屏幕截图 2023-12-05 161310.png

关于延迟,对于我个人的经验来说,基于网络多人测试的共同结果,肥鲨HDO2模拟眼镜大约有15毫秒的延迟,盒子眼镜大概有25ms以上的延迟,摄像头有3-25毫秒左右的延迟,我使用的CCD典型延迟是16毫秒。所以我之前练习的图传总延迟是在30-40毫秒区间,这个范围我感受不到延迟。当使用某盒子眼镜和延迟较大的摄像头平头哥时我能明显感觉到延迟的增加,但流畅度不受影响。更多的设备延迟测试可以搜索网络,几个著名的UP主都有。而较快的竞速摄像头一般延迟在2-3毫秒,加上眼镜15毫秒,总延迟在20毫秒以内。HDZERO的总延迟在15毫秒左右,这也是为什么HDZERO可以成为竞速系统。

MIT一小组发现大脑最快13毫秒感知画面

The notice of Hdzero on ardupilot

August 28, 2023 分类:FPV

Categories:FPV August 28, 2023

When we first setup our Hdzero vtxs with Ardupilot firmware we tend to google it first, at least that's what I have been. And there are articles that suggest to set "MSP" option to "4". But as times gone by we no longer need to do so. Just simply leave it there the default "0" and set the corresponding serial port to "42", don't mess up with braud rates and leave the default "115" and it is good to go.
Also need to know you need the newer versions of Hdzero firmware. It contains the essential fonts that ardupilot OSD use to display.

肥鲨高清眼镜用后感

August 27, 2023 分类:FPV

Categories:FPV August 27, 2023

补充一个肥鲨高清眼镜的体验。它和蜗牛版本应该是相同的。
首先拿在手里会感觉非常精致小巧对比HDZERO来说,肥鲨的做工还是可以的,看起来外形也很像一个鲨鱼头。只可惜有两个我看来比较严重的缺点:1.和早期的模拟肥鲨眼镜一样,面罩很窄,不能适合所有人的脸庞,只能通过更换海绵垫来解决,但效果不会特别好,因为距离也变了。2.机身前后距离太长,导致重心靠外,等你装上天线会有更严重的下坠,其实我认为蜗牛可以和DJI合作,用他们的一体版就很完美,我想多了~

我最期待的就是之前在HDZERO眼镜加VRX无法实现的1080P模式,等实际使用时才发现结果大失所望。也有比较明显的掉帧,眼睛感到强烈不适。。抱歉,我的是这样。
然后就是相比VRX的HDMI带来的延迟,它的延迟会更小一点。可能正是这个延迟让其更流畅,无论我尝试何种码率搭配,720P也会有比VRX更多的卡顿。。

再见。蜗牛眼镜。

我仍然相信这是个有潜力的系统,请优化一下眼镜,外形和延迟处理。哪怕是增加一点延迟~ 延迟的高低不是问题,问题在于卡顿。

先这样。

FPV

May 31, 2023 分类:FPV

Categories:FPV May 31, 2023

随着数字图传的性能越来越好,FPV的入门也变得更加容易起来。早期模拟的时代,设备性能都有限,一般眼镜的分辨率也低得可怜,还有各种“盒子眼镜”。即便是后期RF出现,很多人也未必能真的适应模拟的画质,从而过早放弃。糟糕的画面很大程度上影响空间的判断,穿越障碍物也非常困难。除了大量练习磨合装备外,我觉得在设备的选择上也是有一点点的技巧的,比如CMOS摄像头虽然像素更清晰一些,但是相比过时的CCD会更多地被光干扰(同Mr Steele)。而模拟本来就不见得是一定要看清楚才能飞~想象一下蝙蝠是怎么在黑夜里飞行的~

每个人都喜欢尝鲜,但变来变去,轴距也就那几个尺寸,电机也一样。如果想早日玩好一种机型,就要适当专一,如非必要不变更任何装备和配件。即便是练习的机器,也尽可能使用同一架,第二架可作为备用机,在主机没办法飞时不至于提前回家。

尽可能地使用高性能的产品。而高性能也不总是高价格,比如ELRS遥控系统,即好用又便宜。高刷对飞行起到很大作用,setpoint的高刷新率和稳定的无线链路,如果你是BF飞控建议完全关闭它的自动插值。这里我还是保守地使用成熟的opentx搭配“众矢之的”Frsky遥控器:D减少不必要的jitter等等。说到精度,RATE值肯定不是高了就“牛逼”,有得有失,高RATE低精度,低RATE高精度,自己在每个方面都要做到取舍,选择自己最需要的那个。每一方面都提高一点加起来就很多,你的飞机也会更好飞。这让人想起来整机减重,每个配件都尽可能选用最轻的,整机就会很轻。

要玩好就要完全投入,远离哗众取宠,告别设备测试员。做到这几点,相信会很有帮助。通往罗马的路有很多,或许你有更好的见解~