## Search found 41 matches

Tue Jun 25, 2019 2:20 am
Forum: General Topics
Topic: using 3 bus of UART
Replies: 1
Views: 2699

### using 3 bus of UART

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.
Fri Jun 21, 2019 2:19 am
Forum: Technical Discussion
Topic: camera matrix
Replies: 13
Views: 9338

### Re: camera matrix

after finding the distortion cooefficients, how can we relate this to cx and cy?
Tue Jun 11, 2019 4:14 am
Forum: General Topics
Topic: finding relative angles
Replies: 10
Views: 8873

### Re: finding relative angles

Hi dominik,
Have you found the way to do that?That in the sense,making your robotic arm to point towards object?
Tue Jun 11, 2019 4:11 am
Forum: General Topics
Topic: polar coordinates
Replies: 1
Views: 4658

### polar coordinates

hi,
Can i find polar coordinates of object detected in image using cx and cy?
Wed Feb 27, 2019 4:06 am
Forum: General Topics
Topic: finding relative angles
Replies: 10
Views: 8873

### Re: finding relative angles

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?
Wed Feb 27, 2019 2:08 am
Forum: General Topics
Topic: finding relative angles
Replies: 10
Views: 8873

### Re: finding relative angles

i dont need exact values. but approximated one is enough.
Wed Feb 27, 2019 1:08 am
Forum: General Topics
Topic: finding relative angles
Replies: 10
Views: 8873

### Re: finding relative angles

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...
Tue Feb 26, 2019 11:13 pm
Forum: General Topics
Topic: finding relative angles
Replies: 10
Views: 8873

### finding relative angles

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?
Sat Feb 02, 2019 3:05 am
Forum: General Topics
Topic: openmv serial communication with arduino not working properly
Replies: 6
Views: 3726

### Re: openmv serial communication with arduino not working properly

whether i need to connect any pullup or pulldown resistor to arduino mega?
Fri Feb 01, 2019 11:58 pm
Forum: General Topics
Topic: openmv serial communication with arduino not working properly
Replies: 6
Views: 3726

### Re: openmv serial communication with arduino not working properly

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 ...
Fri Feb 01, 2019 10:36 pm
Forum: General Topics
Topic: openmv serial communication with arduino not working properly
Replies: 6
Views: 3726

### Re: openmv serial communication with arduino not working properly

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
Fri Feb 01, 2019 9:23 pm
Forum: General Topics
Topic: openmv serial communication with arduino not working properly
Replies: 6
Views: 3726

### openmv serial communication with arduino not working properly

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...
Tue Jan 22, 2019 11:49 pm
Forum: General Topics
Topic: find real x and y coordinates of an object
Replies: 9
Views: 5959

### Re: find real x and y coordinates of an object

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,...
Mon Jan 21, 2019 4:02 am
Forum: General Topics
Topic: find real x and y coordinates of an object
Replies: 9
Views: 5959

### Re: find real x and y coordinates of an object

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.
Sun Jan 20, 2019 10:25 pm
Forum: General Topics
Topic: find real x and y coordinates of an object
Replies: 9
Views: 5959

### Re: find real x and y coordinates of an object

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...
Sun Jan 13, 2019 10:37 pm
Forum: General Topics
Topic: margin in for loop of color tracking
Replies: 1
Views: 2154

### margin in for loop of color tracking

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
Wed Jan 09, 2019 3:08 am
Forum: General Topics
Topic: find real x and y coordinates of an object
Replies: 9
Views: 5959

### Re: find real x and y coordinates of an object

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.
Wed Jan 09, 2019 1:54 am
Forum: General Topics
Topic: find real x and y coordinates of an object
Replies: 9
Views: 5959

### find real x and y coordinates of an object

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
Wed Jan 09, 2019 1:48 am
Forum: General Topics
Topic: area threshold and pixel threshold
Replies: 1
Views: 1693

### area threshold and pixel threshold

what is the difference between area_threshold and pixel_threshold in the for loop of blob detection?
Wed Jan 09, 2019 1:36 am
Forum: General Topics
Topic: color sensor
Replies: 3
Views: 2108

### Re: color sensor

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.
Mon Jan 07, 2019 10:53 pm
Forum: General Topics
Topic: maintaing same brightness throughout video
Replies: 13
Views: 5179

### Re: maintaing same brightness throughout video

Hi,
i need to detect white colored object within 3-5cm under sunlight using an color sensor. Which sensor best fit for this?
Mon Jan 07, 2019 10:48 pm
Forum: General Topics
Topic: color sensor
Replies: 3
Views: 2108

### color sensor

Hi,
i need to detect white colored object within 3-5cm under sunlight using an color sensor. Which sensor best fit for this?
Fri Dec 21, 2018 8:04 pm
Forum: General Topics
Topic: maintaing same brightness throughout video
Replies: 13
Views: 5179

### Re: maintaing same brightness throughout video

Hi,
I am also using the polarizing filter which i bought from you.
Fri Dec 21, 2018 10:36 am
Forum: General Topics
Topic: maintaing same brightness throughout video
Replies: 13
Views: 5179

### Re: maintaing same brightness throughout video

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
Wed Dec 19, 2018 3:04 am
Forum: General Topics
Topic: distance calculation using two openmv
Replies: 3
Views: 2202

### Re: distance calculation using two openmv

hi,
which sensor you have used for this?
Mon Dec 17, 2018 5:19 am
Forum: General Topics
Topic: distance calculation using two openmv
Replies: 3
Views: 2202

### distance calculation using two openmv

Hi,
Can i calculate the distance of an object from the camera using two openmv cameras?
Kindly help me with this.
Mon Dec 17, 2018 5:17 am
Forum: General Topics
Topic: maintaing same brightness throughout video
Replies: 13
Views: 5179

### Re: maintaing same brightness throughout video

yes jisheng. you got it correctly. can you help me?
Tue Dec 11, 2018 5:36 am
Forum: General Topics
Replies: 1
Views: 1905

Hi,
Why the lens is always needed to be adjusted? Can't i fix it for clear view and make it permanent?
Sat Dec 08, 2018 3:38 am
Forum: General Topics
Topic: maintaing same brightness throughout video
Replies: 13
Views: 5179

### Re: maintaing same brightness throughout video

what will the polarizer filter do?
Thu Nov 29, 2018 11:17 pm
Forum: General Topics
Topic: maintaing same brightness throughout video
Replies: 13
Views: 5179

### Re: maintaing same brightness throughout video

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?
Thu Nov 29, 2018 11:14 pm
Forum: General Topics
Topic: polarizing filter
Replies: 2
Views: 1999

### Re: polarizing filter

Thanks a lot
Thu Nov 29, 2018 4:46 am
Forum: General Topics
Topic: maintaing same brightness throughout video
Replies: 13
Views: 5179

### maintaing same brightness throughout video

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?
Thu Nov 29, 2018 3:49 am
Forum: General Topics
Topic: polarizing filter
Replies: 2
Views: 1999

### polarizing filter

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.
Wed Oct 24, 2018 2:39 am
Forum: Technical Discussion
Topic: differentiating between cotton and plant
Replies: 12
Views: 3773

### Re: differentiating between cotton and plant

Hi,
For exposure control,is only the L-max and L-min enough??
Thank you
Mon Oct 22, 2018 9:15 am
Forum: Technical Discussion
Topic: differentiating between cotton and plant
Replies: 12
Views: 3773

### Re: differentiating between cotton and plant

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...
Wed Oct 17, 2018 7:28 am
Forum: Technical Discussion
Topic: differentiating between cotton and plant
Replies: 12
Views: 3773

### Re: differentiating between cotton and plant

which lens is best suited for my application??
Wed Oct 17, 2018 7:24 am
Forum: Technical Discussion
Topic: differentiating between cotton and plant
Replies: 12
Views: 3773

### Re: differentiating between cotton and plant

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?
Tue Oct 16, 2018 3:24 am
Forum: Technical Discussion
Topic: OSError: Could not find the file for module nn
Replies: 6
Views: 3378

### OSError: Could not find the file for module nn

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.
Tue Oct 16, 2018 3:02 am
Forum: Technical Discussion
Topic: differentiating between cotton and plant
Replies: 12
Views: 3773

### Re: differentiating between cotton and plant

Kindly see the images in which both cotton and leaves are detected as same in sunlight.
Tue Oct 16, 2018 1:46 am
Forum: Technical Discussion
Topic: differentiating between cotton and plant
Replies: 12
Views: 3773

### Re: differentiating between cotton and plant

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??
Thanks again
Mon Oct 15, 2018 6:38 am
Forum: Technical Discussion
Topic: differentiating between cotton and plant
Replies: 12
Views: 3773

### differentiating between cotton and plant

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.