Find bit depth of image opencv

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have the following code. I am trying to save a 16 bit depth image which I retrieve from Kinect v1 as a png file. I wrote the following code sample:. It works when I add the following code, which converts data from a 16 bit unsigned to an 8 bit unsigned NumPy array:.

But I need to have a 16 bit png file. Learn more. Asked 2 years, 10 months ago. Active 2 years, 10 months ago. Viewed 9k times. How I can save it as a 16 bit png file? In other words, cv2. I think we need a minimal, complete and verifiable example to help you. Active Oldest Votes. Thanks for the fix, was pulling my hair out over this. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. However, this gives me a depth of 8 for an obviously bit image. Am I doing something wrong? Is there some way to do it with pure Python code? I don't see the depth attribute documented anywhere in the Python Imaging Library handbook. However, it looks like only a limited number of modes are supported. You could use something like this:. The transform used to create the Jpeg data renders a continuous color spectrum on decompression.

PIL is reporting bit depth per "band". I don't actually see depth as a documented property in the PIL docs, however, I think you want this:. See here for more info. I was going to say that JPG images are 24 bit by definition. They normally consist of three 8 bit colour channels, one for each of red, green and blue making 24 bits per pixel.

However, I've just found this page which states:. If you use a more modern version of Photoshop, you'll notice it will also let you work in bits per channel, which gives you 48 bits per pixel.

find bit depth of image opencv

I think this is what you're asking for I personally use a variation on this code to determine if it makes sense to convert from RGB to an indexed mode. Learn more. How can I get the depth of a jpg file?

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Depth and type of matrix in OpenCV

I want to retrieve the bit depth for a jpeg file using Python. Thanks in advance. Edit: It's data. Are you sure you're using the right function? I couldn't find depth in the PIL Handbook and perhaps the return value of 8 is still correct - it could stand for "8 bits per pixel". Yeah it's 8 bpp. What wasn't obvious to me was that it was for each band as per Mike's answer.

Active Oldest Votes. Debvrat Varshney 57 6 6 bronze badges. Adam Rosenfield Adam Rosenfield k 89 89 gold badges silver badges bronze badges. Greg Hewgill Greg Hewgill k gold badges silver badges bronze badges.

I don't actually see depth as a documented property in the PIL docs, however, I think you want this: data. Mike Mike 4, 2 2 gold badges 15 15 silver badges 11 11 bronze badges.

However, I've just found this page which states: If you use a more modern version of Photoshop, you'll notice it will also let you work in bits per channel, which gives you 48 bits per pixel.It can be used to store 2D images with channels of data. When your code receives a cv::Mat from an external library or code, the most common question you have is what is the data type of the elements of this image?

There seem to be two methods in the cv::Mat class that answer this: depth and type. Depth is the more fundamental of the two queries. It is the data type of each individual element in the image data. It can take one of these 8 values:. Type combines the data type of the elements along with the number of channels in the image. Since images in OpenCV can have channels, it can take one of these 28 values:.

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Learn how your comment data is processed. Skip to content. About Contact Me. Ashwin Uncategorized 2 Minutes. Depth Depth is the more fundamental of the two queries. Type Type combines the data type of the elements along with the number of channels in the image. Here are two simple functions that are handy to get the depth and type of image as a string:.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The images have been produced by a fluorescence scanner that generates only this kind of images, and I have confirmed with a commercial software package that they really are bit. Its uncompressed TIFF, so shouldn't be much trouble. I had a similar problem using OpenCV 2. I was actually using 12bit tiff Images, which does not make it easier Learn more. Asked 9 years, 9 months ago.

Active 4 years, 7 months ago. Viewed 7k times. How can I open these images and work with the original bit depth? Active Oldest Votes. Utkarsh Sinha Utkarsh Sinha 3, 4 4 gold badges 25 25 silver badges 42 42 bronze badges. Hi Utkarsh! Thank you very much for your answer. I've been working with OpenCV only for a couple of months. Could you give me a hint about how to do that? Loading an image isn't an OpenCV thing. You can use fopen and related functions to open the file and load the image pixels.

Or you can try libtiff. Thank you very much for your help!! LoadImageM "test. I am using OpenCV 2. Aziz Shaikh Arturo Arturo 11 1 1 bronze badge. I can recommend ImageMagic. You can verify that your image is really 16bit display myImage. Pepslee Pepslee 1 4 4 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap.Can someone please provide me with a solution to this problem, or at least explain what I'm doing wrong?

Depth number of bits by channel A jpg image like lena. Sorry but I still don't understand. I already know all of this, and it's not working.

I'm new to openCV and new to programming so I don't really know what to do It seems that you are not using opencv 3.

Color Filtering - OpenCV with Python for Image and Video Analysis 7

I don't know if imread had changed between 2. Check this. It says that depth function returns the depth of an individual channel and channels returns the number of channels in image. Thus, in your case, image seems to have depth of 16bits with number of channels equal to 4.

You say depth returns the depth of an individual channel. I already understand that part, and then you say that my image 'seems to have depth of 16bits'. I would really appreciate it if you could provide me the code to calculate the depth for one channel: eg:. My bad for the typing error. What I simply mean is depth function returns number of bits used to represent a single channel. Asked: What is the most effective way to access cv::Mat elements in a loop? Is stereoRectifyUncalibrated efficient?

Is there penalty for reference counting in Mat? Saving an image with unset pixels. Missing depth attribute on images. Find pixel color out of cv::Mat on specific position.

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find bit depth of image opencv

Thanks in advance, Mark. Here is the image. I still don't understand Question Tools Follow. Related questions What is the most effective way to access cv::Mat elements in a loop? Copyright OpenCV foundation Powered by Askbot version 0. Please note: OpenCV answers requires javascript to work properly, please enable javascript in your browser, here is how.

Ask Your Question.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more. Ask Question. Asked 5 years, 10 months ago. Active 5 years, 10 months ago. Viewed 1k times. How to find whether the image loaded is 8 bit or 16 or 32?

And what is the range of values for " Lab color space " for 32 bit image? ANd what happens for the range for Lab 16 bit image?

find bit depth of image opencv

Pruthvi P Pruthvi P 5 5 silver badges 27 27 bronze badges. Active Oldest Votes. It is simple to find the format of a matrix. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta.

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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am using a dataset in which it has images where each pixel is a 16 bit unsigned int storing the depth value of that pixel in mm. I am trying to visualize this as a greyscale depth image by doing the following:. However, it is only showing two colours this is because all of the values are close together i.

Is there a way to normalize this data such that it will show various grey levels to highlight these small depth differences? According to the documentationthe function imshow can be used with a variety of image types. It support bit unsigned images, so you can display your image using. If your image only contains values on the low part of this range, you will observe an obscure image.

If you want to use the full display range from black to whiteyou should adjust the image to cover the expected dynamic range, one way to do it is. If imshow input has floating point data type then the function assumes that pixel values are in [0; 1] range.

As result all values higher than 1 are displayed white. Adding to Sammy answer, if the original range color is [-min,max] and you want to perform histogram equalization and display the Depth color, the code should be like below:. Learn more. Asked 7 years, 4 months ago. Active 6 years, 6 months ago. Viewed 64k times. Aly Aly Active Oldest Votes.

find bit depth of image opencv

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