Pgm file matlab

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You may receive emails, depending on your communication preferences. When I read a pgm file on matlab and read it for some reason it changes the elements, how can i prevent that from happening? I can't attach the image but can someone help me in making sure the elements dont change when reading a pgm file, thank you.

Show older comments. Syed Ahmed on 30 Jan Vote 0. Commented: Image Analyst on 19 Apr T Vinai Datta Reddy on 18 Apr Cancel Copy to Clipboard. I'm facing the same issue too. For instance, when I try to display the first 15 values of the image in C, I get -. And in Matlab,. Observe that the pattern is same. Anyway, I'm unable to upload the image file here since.

Image Analyst on 19 Apr Location of the origin of the local frame in world coordinates, specified as a two-element vector, [xLocal yLocal]. Use the move function to shift the local frame as your vehicle moves. Location of the bottom-left corner of the grid in local coordinates, specified as a two-element vector, [xLocal yLocal]. Default value for unspecified map locations including areas outside the map, specified as a scalar between 0 and 1 inclusive.

Add a second reading and view the update to the occupancy values. The additional reading increases the confidence in the readings. The free and occupied values become more distinct.

PGM values are expressed from 0 to as uint8. Normalize these values by converting the cropped image to double and dividing each cell by This image shows obstacles as values close to 0.

Subtract the normalized image from 1 to get occupancy values with 1 representing occupied space. Create the occupancyMap object using an adjusted map image. The imported map resolution is 20 cells per meter. The values are stored as int16 using a log-odds representation. When calling setOccupancy and then getOccupancy , the value returned might not equal the value you set.

For more information, see the log-odds representations section in Occupancy Grids. If memory size is a limitation, consider using binaryOccupancyMap instead. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:.

Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location. Toggle Main Navigation. Search MathWorks. Open Mobile Search. Off-Canvas Navigation Menu Toggle. Main Content. Description occupancyMap creates a 2-D occupancy grid map object. Input Arguments expand all width — Map width scalar.

Map width, specified as a scalar in meters. Map height, specified as a scalar in meters. Note I loaded that data into a cell array: this is because images commonly are stored as a 3D matrix: as an alternative you could store them is a 4D numeric array.

Stephen on 18 Aug How are you checking this? What are you looking at that tells you that only the last file is being read? Note that as I mentioned in my answer, most likely your images are 3D RGB images, which means that concatenating them along the 1st, 2nd, or 3rd dimension will probably not give you a very useful numeric array. That I why I put them into a cell array, then each image is conveniently stored as its own array.

If you really want to merge them into one numeric array then the most important step is to ensure that all of the images have the same size:. You could concatenate them along any dimension that you choose:. Alternatively, if you really have 2D images e. I wanted to reshape it as.

But can't do it as its a cell array. Stephen Cobeldick I'm sorry I didn't see my mistake. Your code is perfectly correct. Stephen cobeldick when I try to concatenate for 2D images I'm getting its size as [19 ] whereas I want it to be [ ] i. Stephen on 21 Aug It sounds like each image is sized 19x19, and you want to reshape each image into a column, before concatenating into one array.

Here is one solution untested :. Stephen Cobeldick yes, you are correct. I want to reshape each image into the column and make it a matrix.

But I don't want it to be in an array. Thanks Stephen Cobeldick.