OpenMV

krishnakumar77777

can as use p4 for transmitter and p5 as other GPIO pin in openmv7?
i dont need receiver pin for openmv and i need a GPIO pin for input.

krishnakumar77777

after finding the distortion cooefficients, how can we relate this to cx and cy?

krishnakumar77777

Hi dominik,
Have you found the way to do that?That in the sense,making your robotic arm to point towards object?

krishnakumar77777

hi,
Can i find polar coordinates of object detected in image using cx and cy?

krishnakumar77777

ok thank you.
I got the point that i can make an experiment by fixing the lens by adjusting it at needed view and then measure actual angle and what shows in openmv and then derive a formula.is it right?

krishnakumar77777

i dont need exact values. but approximated one is enough.

krishnakumar77777

field of view of openmv is HFOV=70.8 degree and VFOV=55.6degree. for resolution of 320x240, the first pixel in x has (70.8/320)*1=0.22125degree of angle from center and first pixel in y has (55.6/240)*1=0.231666667degrees. if a object in image with centroid of cx of 20 and cy of 25 is detected, then...

krishnakumar77777

Hi,
Can i get the values of relative angle of objects in an image with respect to camera?
Can i make use of FOV and resolution to find the angle of object with respect to camera?

krishnakumar77777

whether i need to connect any pullup or pulldown resistor to arduino mega?

krishnakumar77777

hi, I am using the uart 3 bus and pins p4 and p5. im using P1 and P2 as GPIO/pyb pins for making output and input digital high/low. will this cause problem with arduino. My arduino runs the motor as slowed down when im running the openmv script and when i commented the declaration of bus 3 uart,the ...

krishnakumar77777

i am using P1 and P2 for other usage. cant i use those pins out of uart for other usages?
i have seen this now and asking it... https://docs.openmv.io/library/pyb.UART ... ow-control

krishnakumar77777

hi, i am sending the blob's x and y to arduino mega using the uart 3...The data is correctly sended to arduino mega as i checked this through computer's serial port after connecting arduino tx and rx with openmv's p4 and p5...i have tried this using a simple code...for our project we need to send th...

krishnakumar77777

Hi, We have a x-Slide of length 25cm. The camera will move from left to right end. That is 0 to 25 cm. Camera will be facing a wall. The camera's coverage area on the wall will be increased with increase in distance,right?. I have to find the area that the camera can cover. When the camera is moved,...

krishnakumar77777

How can i draw the line or else can i use the dots to make a line on the picture taken?
Like the image and i need to get the roi.
Actually i know the speed in which the camera is moving(speed of x-slide).
And also i can get the fps.

krishnakumar77777

hi, i am moving the camera using a slide to take video. The slide will move for some distance only. Can i take a picture by positioning the camera at centre of slide and then can i draw a line on the picture by moving the camera on slide from slides's left and right end to find the how much range ca...

krishnakumar77777

What is the use of margin in the for loop of find_blobs in color tracking?
Kindly Give an example for explaining that.
Thank yoiu

krishnakumar77777

I am using openmv 7 cam to find the multi-blobs. The camera will be in front of a plant. If there is a fruit in the plant, the camera detects that and this is okay. I need to pick the fruit as we move the cam up,down,left,right and in depth and use a tool to pick the fruit.

krishnakumar77777

Hi,
I need to calculate the x and y location of an object in real-time. Here i know the maximum coverage area of the camera and also depth.
Thank you

krishnakumar77777

what is the difference between area_threshold and pixel_threshold in the for loop of blob detection?

krishnakumar77777

Already we are using the openmv only to find the blob. But we can't find the distance(depth) so that we need a sensor for detecting the object at close which will be white in color. The object will be in the plant.

krishnakumar77777

Hi,
i need to detect white colored object within 3-5cm under sunlight using an color sensor. Which sensor best fit for this?

krishnakumar77777

Hi,
i need to detect white colored object within 3-5cm under sunlight using an color sensor. Which sensor best fit for this?

krishnakumar77777

Hi,
I am also using the polarizing filter which i bought from you.

krishnakumar77777

hi,
lightness threshold means?what i want to use from get-statitics function? L or A or B? median or mean or standard deviation? help please

krishnakumar77777

hi,
which sensor you have used for this?

krishnakumar77777

Hi,
Can i calculate the distance of an object from the camera using two openmv cameras?
Kindly help me with this.

krishnakumar77777

yes jisheng. you got it correctly. can you help me?

krishnakumar77777

Hi,
Why the lens is always needed to be adjusted? Can't i fix it for clear view and make it permanent?

krishnakumar77777

what will the polarizer filter do?

krishnakumar77777

By disabling all these,can i get the same amount of light even when the openmv moves?I explain my scenario. I want to detect lemon fruit in the plant in outdoor by making the scanning using movement of openmv cam on a slide. Can disabling helps me out?

krishnakumar77777

Thanks a lot

krishnakumar77777

Hi,
How can i keep the brightness of video same throughout the video where the openmv cam will be moved in all x,y and z direction seperately in outdoor?

krishnakumar77777

Hi,
i have bought a polarizer filter from your site for our openmv cam. How can we fix it in openmv?Please share any demo or video.

krishnakumar77777

Hi,
For exposure control,is only the L-max and L-min enough??
Thank you

krishnakumar77777

Thanks for the reply. As i tried by changing the exposure value of different values such as 1000,2000 upto 10000 in another area(on roof of a building). check the images. And i made the test in evening when sun is not much brighter. So, i could find the white coloured blobs(cotton). And the green co...

krishnakumar77777

which lens is best suited for my application??

krishnakumar77777

hi,
i had tried by reducing the exposure,but of no use. If i reduce the exposure, the screen of ide gets darker,since the plant is not green in ide.what may be the problem?

krishnakumar77777

When i tried to run the cifar10 network program,it is showing the following error. How can i solve this.
OSError: Could not find the file.
nn.load('/cifar10.network')

krishnakumar77777

Kindly see the images in which both cotton and leaves are detected as same in sunlight.

krishnakumar77777

Thank you.
I have done that and taken threshold values from frame buffer. The cam shows both the cotton and leaf as detected white blob. Will the polarizing filter helps us in order to make the leaf appear green by filtering the solar light??
Kindly reply asap.
Thanks again

krishnakumar77777

Hi,
I need to differentiate between the colour of the cotton in the plant and sun light on leaf that also observed by cam as white colour. Please help me to differentiate between the actual cotton white and light reflected by the plant's leaves.

Thanks in advance

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