![]() ![]() bmp files under 390KB in size.Ĭompressing and writing a VGA image takes about 180MSec. The original 600KB RGB565 image is too large to upload to the forum which only allows. My compressed test images are about 40KBytes. jpg extension.Īn uncompressed VGA image in RGB565 format is 614KBytes. * The encoder compresses the file and writes it to SD card with. * Call the JPG encoder with a pointer to the RGB888 buffer and a file name. * Use the Pixel Pipeline to convert the captured image from the original format to the RGB888 format the encoder wants. YUV images compress to smaller files due to the reduced spatial color resolution. The image can be either RGB565 or YUV422 encoded. * Capture a VGA-sized image to a buffer in EXTMEM. I changed the code to use a bitmap in EXTMEM as the input data. In the original code, the bitmap was read from a. ![]() The JPEG compressor needs an RGB888 bitmap as input. The fact that DMAMEM doesn't get initialized is not an issue as an initialization function called from setup() fills the tables. The original code used malloc() to allocate 256KB of buffers that hold pre-computed constants used during the compression. I've downloaded a JPEG compression program and adapted it to run on the T4.1 to which I've connected my OV7670 camera.
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