test_digital_image_processing -> test_local_binary_pattern replacing a large image with a smaller one (#10161)

* Replacing the generator with numpy vector operations from lu_decomposition.

* Revert "Replacing the generator with numpy vector operations from lu_decomposition."

This reverts commit ad217c66165898d62b76cc89ba09c2d7049b6448.

* Replaced lena.jpg with lena_small.jpg to make tests faster.

* Update digital_image_processing/test_digital_image_processing.py

Co-authored-by: Christian Clauss <cclauss@me.com>

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* Update test_digital_image_processing.py

tests fail, I'll try an empty commit

* Apply suggestions from code review

* Update test_digital_image_processing.py

added clarifications

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* Update test_digital_image_processing.py

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Co-authored-by: Christian Clauss <cclauss@me.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tianyi Zheng <tianyizheng02@gmail.com>