On 25 May 2011 11:43, Laurent Pinchart <laurent.pinch...@ideasonboard.com> wrote: > Hi Javier, > > On Wednesday 25 May 2011 11:41:42 javier Martin wrote: >> Hi, >> thank you for the review, I agree with you on all the suggested >> changes except on this one: >> >> On 25 May 2011 10:05, Laurent Pinchart wrote: >> > On Tuesday 24 May 2011 16:30:43 Javier Martin wrote: >> >> This RFC includes a power management implementation that causes >> >> the sensor to show images with horizontal artifacts (usually >> >> monochrome lines that appear on the image randomly). >> >> >> >> Signed-off-by: Javier Martin <javier.mar...@vista-silicon.com> >> > >> > [snip] >> > >> >> diff --git a/drivers/media/video/mt9p031.c >> >> b/drivers/media/video/mt9p031.c new file mode 100644 >> >> index 0000000..04d8812 >> >> --- /dev/null >> >> +++ b/drivers/media/video/mt9p031.c >> > >> > [snip] >> > >> >> +#define MT9P031_WINDOW_HEIGHT_MAX 1944 >> >> +#define MT9P031_WINDOW_WIDTH_MAX 2592 >> >> +#define MT9P031_WINDOW_HEIGHT_MIN 2 >> >> +#define MT9P031_WINDOW_WIDTH_MIN 18 >> > >> > Can you move those 4 constants right below MT9P031_WINDOW_HEIGHT and >> > MT9P031_WINDOW_WIDTH ? The max values are not correct, according to the >> > datasheet they should be 2005 and 2751. >> >> In figure 4, it says active image size is 2592 x 1944 >> Why should I include active boundary and dark pixels? > > Users might want to get the dark pixels for black level compensation purpose. > As the chip allows for that, it should be supported. The default should of > course be the active area of 2592 x 1944 pixels. >
OK, that sounds reasonable. However, that would include black pixels that are located at the beginning of the array (0,0) to (16, 54), which means that users would have to specify a crop value of (15,54) to eliminate those initial black level pixels. Which seems quite unnatural to me. Another option could be setting (16,54) as default values and allowing to introduce negative cropping values. Is this possible? And finally, the most sensible idea IMHO could be not letting the user to see pixels from (0,0) to (15,54) (setting 15,54 as minimum and default )and, for black level compensation, ending pixels could be used (2608,1998) to (2751, 2003). What do you think? -- Javier Martin Vista Silicon S.L. CDTUC - FASE C - Oficina S-345 Avda de los Castros s/n 39005- Santander. Cantabria. Spain +34 942 25 32 60 www.vista-silicon.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
