lib: move line assembling routines out of vfs5011 into common code
This commit is contained in:
Vasily Khoruzhick
parent
6fc5293e83
commit
b51fa446e3
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@ -1,6 +1,7 @@
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/*
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* Image assembling routines
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* Copyright (C) 2007-2008 Daniel Drake <dsd@gentoo.org>
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* Copyright (C) 2013 Arseniy Lartsev <arseniy@chalmers.se>
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* Copyright (C) 2015 Vasily Khoruzhick <anarsoul@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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@ -275,3 +276,134 @@ struct fp_img *fpi_assemble_frames(struct fpi_frame_asmbl_ctx *ctx,
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return img;
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}
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static int cmpint(const void *p1, const void *p2, gpointer data)
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{
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int a = *((int *)p1);
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int b = *((int *)p2);
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if (a < b)
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return -1;
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else if (a == b)
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return 0;
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else
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return 1;
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}
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static void median_filter(int *data, int size, int filtersize)
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{
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int i;
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int *result = (int *)g_malloc0(size*sizeof(int));
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int *sortbuf = (int *)g_malloc0(filtersize*sizeof(int));
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for (i = 0; i < size; i++) {
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int i1 = i - (filtersize-1)/2;
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int i2 = i + (filtersize-1)/2;
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if (i1 < 0)
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i1 = 0;
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if (i2 >= size)
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i2 = size-1;
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g_memmove(sortbuf, data+i1, (i2-i1+1)*sizeof(int));
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g_qsort_with_data(sortbuf, i2-i1+1, sizeof(int), cmpint, NULL);
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result[i] = sortbuf[(i2-i1+1)/2];
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}
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memmove(data, result, size*sizeof(int));
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g_free(result);
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g_free(sortbuf);
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}
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static void interpolate_lines(struct fpi_line_asmbl_ctx *ctx,
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GSList *line1, float y1, GSList *line2,
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float y2, unsigned char *output, float yi, int size)
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{
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int i;
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unsigned char p1, p2;
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if (!line1 || !line2)
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return;
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for (i = 0; i < size; i++) {
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p1 = ctx->get_pixel(ctx, line1, i);
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p2 = ctx->get_pixel(ctx, line2, i);
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output[i] = (float)p1
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+ (yi - y1)/(y2 - y1)*(p2 - p1);
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}
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}
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static int min(int a, int b) {return (a < b) ? a : b; }
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/* Rescale image to account for variable swiping speed */
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struct fp_img *fpi_assemble_lines(struct fpi_line_asmbl_ctx *ctx,
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GSList *lines, size_t lines_len)
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{
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/* Number of output lines per distance between two scanners */
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int i;
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GSList *row1, *row2;
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float y = 0.0;
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int line_ind = 0;
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int *offsets = (int *)g_malloc0((lines_len / 2) * sizeof(int));
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unsigned char *output = g_malloc0(ctx->line_width * ctx->max_height);
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struct fp_img *img;
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fp_dbg("%llu", g_get_real_time());
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row1 = lines;
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for (i = 0; (i < lines_len - 1) && row1; i += 2) {
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int bestmatch = i;
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int bestdiff = 0;
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int j, firstrow, lastrow;
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firstrow = i + 1;
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lastrow = min(i + ctx->max_search_offset, lines_len - 1);
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row2 = g_slist_next(row1);
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for (j = firstrow; j <= lastrow; j++) {
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int diff = ctx->get_deviation(ctx,
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row1,
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row2);
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if ((j == firstrow) || (diff < bestdiff)) {
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bestdiff = diff;
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bestmatch = j;
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}
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row2 = g_slist_next(row2);
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}
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offsets[i / 2] = bestmatch - i;
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fp_dbg("%d", offsets[i / 2]);
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row1 = g_slist_next(row1);
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if (row1)
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row1 = g_slist_next(row1);
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}
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median_filter(offsets, (lines_len / 2) - 1, ctx->median_filter_size);
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fp_dbg("offsets_filtered: %llu", g_get_real_time());
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for (i = 0; i <= (lines_len / 2) - 1; i++)
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fp_dbg("%d", offsets[i]);
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row1 = lines;
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for (i = 0; i < lines_len - 1; i++, row1 = g_slist_next(row1)) {
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int offset = offsets[i/2];
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if (offset > 0) {
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float ynext = y + (float)ctx->resolution / offset;
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while (line_ind < ynext) {
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if (line_ind > ctx->max_height - 1)
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goto out;
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interpolate_lines(ctx,
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row1, y,
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g_slist_next(row1),
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ynext,
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output + line_ind * ctx->line_width,
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line_ind,
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ctx->line_width);
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line_ind++;
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}
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y = ynext;
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}
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}
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out:
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img = fpi_img_new(ctx->line_width * line_ind);
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img->height = line_ind;
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img->width = ctx->line_width;
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img->flags = FP_IMG_V_FLIPPED;
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g_memmove(img->data, output, ctx->line_width * line_ind);
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g_free(offsets);
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g_free(output);
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return img;
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}
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@ -47,4 +47,20 @@ unsigned int fpi_do_movement_estimation(struct fpi_frame_asmbl_ctx *ctx,
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struct fp_img *fpi_assemble_frames(struct fpi_frame_asmbl_ctx *ctx,
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GSList *stripes, size_t stripes_len);
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struct fpi_line_asmbl_ctx {
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unsigned line_width;
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unsigned max_height;
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unsigned resolution;
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unsigned median_filter_size;
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unsigned max_search_offset;
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int (*get_deviation)(struct fpi_line_asmbl_ctx *ctx,
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GSList *line1, GSList *line2);
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unsigned char (*get_pixel)(struct fpi_line_asmbl_ctx *ctx,
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GSList *line,
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unsigned x);
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};
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struct fp_img *fpi_assemble_lines(struct fpi_line_asmbl_ctx *ctx,
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GSList *lines, size_t lines_len);
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#endif
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@ -23,6 +23,7 @@
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#include <string.h>
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#include <libusb.h>
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#include <fp_internal.h>
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#include <assembling.h>
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#include "driver_ids.h"
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#include "vfs5011_proto.h"
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@ -285,9 +286,15 @@ static int get_diff_norm(unsigned char *buf1, unsigned char *buf2, int size)
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}
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/* Calculade squared standand deviation of sum of two lines */
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static int get_deviation2(unsigned char *buf1, unsigned char *buf2, int size)
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static int vfs5011_get_deviation2(struct fpi_line_asmbl_ctx *ctx, GSList *row1, GSList *row2)
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{
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unsigned char *buf1, *buf2;
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int res = 0, mean = 0, i;
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const int size = 64;
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buf1 = row1->data + 56;
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buf2 = row2->data + 168;
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for (i = 0; i < size; i++)
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mean += (int)buf1[i] + (int)buf2[i];
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@ -301,121 +308,13 @@ static int get_deviation2(unsigned char *buf1, unsigned char *buf2, int size)
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return res / size;
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}
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static int cmpint(const void *p1, const void *p2, gpointer data)
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static unsigned char vfs5011_get_pixel(struct fpi_line_asmbl_ctx *ctx,
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GSList *row,
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unsigned x)
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{
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int a = *((int *)p1);
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int b = *((int *)p2);
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if (a < b)
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return -1;
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else if (a == b)
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return 0;
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else
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return 1;
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}
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unsigned char *data = row->data + 8;
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static void median_filter(int *data, int size, int filtersize)
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{
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int i;
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int *result = (int *)g_malloc0(size*sizeof(int));
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int *sortbuf = (int *)g_malloc0(filtersize*sizeof(int));
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for (i = 0; i < size; i++) {
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int i1 = i - (filtersize-1)/2;
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int i2 = i + (filtersize-1)/2;
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if (i1 < 0)
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i1 = 0;
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if (i2 >= size)
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i2 = size-1;
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g_memmove(sortbuf, data+i1, (i2-i1+1)*sizeof(int));
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g_qsort_with_data(sortbuf, i2-i1+1, sizeof(int), cmpint, NULL);
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result[i] = sortbuf[(i2-i1+1)/2];
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}
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memmove(data, result, size*sizeof(int));
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g_free(result);
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g_free(sortbuf);
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}
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void interpolate_lines(unsigned char *line1, float y1, unsigned char *line2,
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float y2, unsigned char *output, float yi, int size)
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{
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int i;
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for (i = 0; i < size; i++)
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output[i] = (float)line1[i]
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+ (yi-y1)/(y2-y1)*(line2[i]-line1[i]);
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}
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int min(int a, int b) {return (a < b) ? a : b; }
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/* Rescale image to account for variable swiping speed */
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int vfs5011_rescale_image(unsigned char *image, int input_lines,
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unsigned char *output, int max_output_lines)
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{
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/* Number of output lines per distance between two scanners */
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enum {
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RESOLUTION = 10,
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MEDIAN_FILTER_SIZE = 13,
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MAX_OFFSET = 30,
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GOOD_OFFSETS_CRITERION = 20,
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GOOD_OFFSETS_THRESHOLD = 3
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};
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int i;
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float y = 0.0;
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int line_ind = 0;
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int *offsets = (int *)g_malloc0(input_lines * sizeof(int));
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#ifdef ENABLE_DEBUG_LOGGING
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gint64 start_time = g_get_real_time();
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#endif
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for (i = 0; i < input_lines-1; i += 2) {
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int bestmatch = i;
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int bestdiff = 0;
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int j;
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int firstrow, lastrow;
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firstrow = i+1;
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lastrow = min(i + MAX_OFFSET, input_lines-1);
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for (j = firstrow; j <= lastrow; j++) {
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int diff = get_deviation2(
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image + i*VFS5011_LINE_SIZE + 56,
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image + j*VFS5011_LINE_SIZE + 168,
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64);
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if ((j == firstrow) || (diff < bestdiff)) {
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bestdiff = diff;
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bestmatch = j;
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}
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}
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offsets[i/2] = bestmatch - i;
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fp_dbg("offsets: %llu - %d", start_time, offsets[i/2]);
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}
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median_filter(offsets, input_lines-1, MEDIAN_FILTER_SIZE);
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fp_dbg("offsets_filtered: %llu", g_get_real_time());
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for (i = 0; i <= input_lines/2-1; i++)
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fp_dbg("%d", offsets[i]);
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for (i = 0; i < input_lines-1; i++) {
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int offset = offsets[i/2];
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if (offset > 0) {
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float ynext = y + (float)RESOLUTION / offset;
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while (line_ind < ynext) {
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if (line_ind > max_output_lines-1) {
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g_free(offsets);
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return line_ind;
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}
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interpolate_lines(
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image + i*VFS5011_LINE_SIZE + 8, y,
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image + (i+1)*VFS5011_LINE_SIZE + 8,
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ynext,
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output + line_ind*VFS5011_IMAGE_WIDTH,
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line_ind,
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VFS5011_IMAGE_WIDTH);
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line_ind++;
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}
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y = ynext;
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}
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}
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g_free(offsets);
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return line_ind;
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return data[x];
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}
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/* ====================== main stuff ======================= */
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@ -426,12 +325,22 @@ enum {
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MAX_CAPTURE_LINES = 100000,
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};
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static struct fpi_line_asmbl_ctx assembling_ctx = {
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.line_width = VFS5011_IMAGE_WIDTH,
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.max_height = MAXLINES,
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.resolution = 10,
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.median_filter_size = 25,
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.max_search_offset = 30,
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.get_deviation = vfs5011_get_deviation2,
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.get_pixel = vfs5011_get_pixel,
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};
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struct vfs5011_data {
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unsigned char *total_buffer;
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unsigned char *capture_buffer;
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unsigned char *image_buffer;
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unsigned char *row_buffer;
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unsigned char *lastline;
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unsigned char *rescale_buffer;
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GSList *rows;
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int lines_captured, lines_recorded, empty_lines;
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int max_lines_captured, max_lines_recorded;
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int lines_total, lines_total_allocated;
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@ -511,10 +420,9 @@ static int process_chunk(struct vfs5011_data *data, int transferred)
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data->lastline + 8,
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linebuf + 8,
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VFS5011_IMAGE_WIDTH) >= DIFFERENCE_THRESHOLD)) {
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data->lastline = data->image_buffer
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+ data->lines_recorded
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* VFS5011_LINE_SIZE;
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memmove(data->lastline, linebuf, VFS5011_LINE_SIZE);
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data->lastline = g_malloc(VFS5011_LINE_SIZE);
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data->rows = g_slist_prepend(data->rows, data->lastline);
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g_memmove(data->lastline, linebuf, VFS5011_LINE_SIZE);
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data->lines_recorded++;
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if (data->lines_recorded >= data->max_lines_recorded) {
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fp_dbg("process_chunk: recorded %d lines, finishing",
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@ -529,20 +437,14 @@ static int process_chunk(struct vfs5011_data *data, int transferred)
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void submit_image(struct fpi_ssm *ssm, struct vfs5011_data *data)
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{
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struct fp_img_dev *dev = (struct fp_img_dev *)ssm->priv;
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int height = vfs5011_rescale_image(data->image_buffer,
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data->lines_recorded,
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data->rescale_buffer, MAXLINES);
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struct fp_img *img = fpi_img_new(VFS5011_IMAGE_WIDTH * height);
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struct fp_img *img;
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if (img == NULL) {
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fp_err("Failed to create image");
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fpi_ssm_mark_aborted(ssm, -1);
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}
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data->rows = g_slist_reverse(data->rows);
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img->flags = FP_IMG_V_FLIPPED;
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img->width = VFS5011_IMAGE_WIDTH;
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img->height = height;
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memmove(img->data, data->rescale_buffer, VFS5011_IMAGE_WIDTH * height);
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img = fpi_assemble_lines(&assembling_ctx, data->rows, data->lines_recorded);
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g_slist_free_full(data->rows, g_free);
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data->rows = NULL;
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fp_dbg("Image captured, commiting");
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@ -927,10 +829,6 @@ static int dev_open(struct fp_img_dev *dev, unsigned long driver_data)
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data = (struct vfs5011_data *)g_malloc0(sizeof(*data));
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data->capture_buffer =
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(unsigned char *)g_malloc0(CAPTURE_LINES * VFS5011_LINE_SIZE);
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data->image_buffer =
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(unsigned char *)g_malloc0(MAXLINES * VFS5011_LINE_SIZE);
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data->rescale_buffer =
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(unsigned char *)g_malloc0(MAXLINES * VFS5011_IMAGE_WIDTH);
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dev->priv = data;
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r = libusb_reset_device(dev->udev);
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@ -959,8 +857,7 @@ static void dev_close(struct fp_img_dev *dev)
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struct vfs5011_data *data = (struct vfs5011_data *)dev->priv;
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if (data != NULL) {
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g_free(data->capture_buffer);
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g_free(data->image_buffer);
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g_free(data->rescale_buffer);
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g_slist_free_full(data->rows, g_free);
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g_free(data);
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}
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fpi_imgdev_close_complete(dev);
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