Reduce image size accepting less quality [closed] - image-processing

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I have a directory with images in various sizes, dimensions and formats. I want to create a script/process that processes the images and reduces the image size to the smallest possible e.g. less than 4MB regardless of the original size and I am not interested much in keeping optimal quality.
Is there some build-in linux tool or perl library or some other library I can use for this?

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Need satellite image for land classification [closed]

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I am trying to develop a system(machine learning model) to identify whether the land is agricultural or paddy (dry land or wet-land) and has undergone changes over a period of time.
Can anyone suggest suitable dataset which I can use for training purposes?
after a few research i have got some datasets websites Please do check it:
https://data.world/datasets/land
https://www.researchgate.net/publication/317914265_A_global_dataset_of_crowdsourced_land_cover_and_land_use_reference_data
https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/gdj3.32

Dataset for hand gesture recognition [closed]

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I need a dataset for my future project based on image processing, hand recognition. I need a minimum of 5 hand position and orientation and a minumim of 200 images per set.
I want to know if there are websites where I can find a great variety of datasets.
I recommend you to search here: http://homepages.inf.ed.ac.uk/rbf/CVonline/Imagedbase.htm#gesture.
I needed this for a project too and I found a lot of variations here. It also depends on what kind of gestures you are looking for, but I think you will find here what you need.

Is there a Depth map data base? [closed]

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I want to know whether there is a pre existing data base of synthetic images and their associated depth maps for the purpose of training a NN.
There's the Middlebury dataset:
http://vision.middlebury.edu/stereo/data/
And the NYU Depth dataset:
https://cs.nyu.edu/~silberman/datasets/nyu_depth_v2.html

Memory access is not constant time [closed]

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There is a cute series of four blog posts arguing that memory access should not be considered constant time, but should instead incorporate a square root factor. I cannot seem to find it now however. Anyone got the link?
https://www.reddit.com/r/programming/comments/2v8dty/the_myth_of_ram_part_i_why_a_random_memory_read/
(Literally the first result of a Google search)
Leads to:
The Myth of RAM, part I

is there any Framework to implement a spectrum analyzer? [closed]

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I want to Implement the Music Tracker as like below image.
I want to implement it in to the iphone. So is there any Music API or any Sound Library available to implement it in to iPhone ??
Please help me regarding this.
This isn't a 'tracker', but is a visual representation of the frequency domain for a given time period during playback.
You'll need a library that can do Fast Fourier Transforms (FFT) such as this.

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