Add explicit memory cleanup after image generation operations

[Copilot]

Large numpy arrays created during sonar image export were not being explicitly freed, causing memory accumulation during batch processing.

Changes

• class_sonObj.py and class_sonObj_nadirgaptest.py: Added del and gc.collect() after imsave() calls in:

  • _writeTiles(): Cleanup temporary data array
  • _writeTilesPlot(): Cleanup norm_data, colored_data, and data arrays
  • _exportMovWin(): Cleanup a_img, b_img, and movWin arrays after processing each tile type

• class_portstarObj.py: Added gc.collect() after existing del statements following debug image saves

Example

def _writeTiles(self, k, imgOutPrefix, tileFile='.jpg', colormap=False):
    data = self.sonDat.astype('uint8')
    # ... prepare output directory and filename ...
    imsave(os.path.join(outDir, filename), data, check_contrast=False)
    
    # Clean up temporary data array to free memory
    del data
    gc.collect()
    
    return

The gc module is already imported via from pingmapper.funcs_common import *.

Original prompt

Can you help with room drain and image generation

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